Are you over 18 and want to see adult content?
More Annotations
![A complete backup of family-sphere.com](https://www.archivebay.com/archive2/22656e78-1cb6-4d92-a08d-90203858a28a.png)
A complete backup of family-sphere.com
Are you over 18 and want to see adult content?
![A complete backup of iconnectinfluence.com](https://www.archivebay.com/archive2/e16991c9-4668-4a83-aeda-cf8cfdf22781.png)
A complete backup of iconnectinfluence.com
Are you over 18 and want to see adult content?
![A complete backup of lawrence.k12.ma.us](https://www.archivebay.com/archive2/12ee0628-82f8-4540-9faf-99ec0018a01f.png)
A complete backup of lawrence.k12.ma.us
Are you over 18 and want to see adult content?
![A complete backup of reflectiveshapes.com](https://www.archivebay.com/archive2/8163a9ef-3908-485c-ac73-acd11721d70e.png)
A complete backup of reflectiveshapes.com
Are you over 18 and want to see adult content?
![A complete backup of safestbettingsites.com](https://www.archivebay.com/archive2/3b0ce0da-7c1a-42da-aa0e-d7eba24f7023.png)
A complete backup of safestbettingsites.com
Are you over 18 and want to see adult content?
![A complete backup of minubeducativa.com](https://www.archivebay.com/archive2/8eb57353-0eff-47ea-95ed-3a6164f19384.png)
A complete backup of minubeducativa.com
Are you over 18 and want to see adult content?
![A complete backup of cfppytthonejer.blogspot.com](https://www.archivebay.com/archive2/8b003795-a219-46ad-82e9-6d8f581f04dd.png)
A complete backup of cfppytthonejer.blogspot.com
Are you over 18 and want to see adult content?
Favourite Annotations
![A complete backup of onlineweddingshop.nl](https://www.archivebay.com/archive/fcfcd7d4-5003-4226-bb7e-95148a7a0c7c.png)
A complete backup of onlineweddingshop.nl
Are you over 18 and want to see adult content?
![A complete backup of iproperty.com.my](https://www.archivebay.com/archive/936380ea-3eac-441a-a8ba-d61a69d32dc6.png)
A complete backup of iproperty.com.my
Are you over 18 and want to see adult content?
![A complete backup of cybersecurity-excellence-awards.com](https://www.archivebay.com/archive/31414900-9e21-4166-a859-f4354d457e4b.png)
A complete backup of cybersecurity-excellence-awards.com
Are you over 18 and want to see adult content?
![A complete backup of mapleleafshotstove.com](https://www.archivebay.com/archive/e59b8090-e574-4b8e-8262-836a122acacc.png)
A complete backup of mapleleafshotstove.com
Are you over 18 and want to see adult content?
![A complete backup of teknikmesinzone.blogspot.com](https://www.archivebay.com/archive/f30ee012-7722-414e-8f2d-448b06edf2c5.png)
A complete backup of teknikmesinzone.blogspot.com
Are you over 18 and want to see adult content?
![A complete backup of kabasen3.blogspot.com](https://www.archivebay.com/archive/b840b98c-3a2d-4951-806e-8e99dd56eaf6.png)
A complete backup of kabasen3.blogspot.com
Are you over 18 and want to see adult content?
Text
bubble
INTERACTIVE COMMENT ON “MODELING THE IMPACT OF SOIL BGD 9, C7639–C7642, 2013 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper Biogeosciences Discuss., 9, C7639–C7642, 2013 INTERACTIVE COMMENT ON NITROGEN CYCLING IN know anything more about N cycling in models than I did before. I feel, the results from these models need to be analyzed and reported in a much more clever way to provideTRICHODESMIUM
Dupouy and coauthors have proposed a rather intriguing approach to detecting Trichodesmium using satellite derived ocean color data. This is an important problem that has vexed the community for a long time and every new approach BGD - EFFECTS OF OCEAN ACIDIFICATION ON THE LARVAL GROWTH Abstract. Little is known about how marine fishes respond to the reduced pH condition caused by the increased CO 2 in the atmosphere. We investigated the effects of CO 2 concentra INTERACTIVE COMMENT ON “SPECIFIC RATES OF LEUCINE BGD 7, C4012–C4020, 2010 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper Biogeosciences Discuss., 7, C4012–C4020, 2010 INTERACTIVE COMMENT ON “ESTIMATING GLOBAL CARBON UPTAKE BY BGD 10, C1114–C1117, 2013 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper Biogeosciences Discuss., 10, C1114–C1117, 2013 INTERACTIVE COMMENT “DIRECT OBSERVATION OF BGD 10, C1612–C1615, 2013 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper extension in the central pacific, we RECEIVED AND PUBLISHED: 25 OCTOBER 2012 meaningfully. Much to my regret I therefore cannot recommend to publish the study in Biogeosciences, although, apart from the way of parameterization the whole study is RECEIVED AND PUBLISHED: 25 APRIL 2015 over anaerobic landscapes (considered from a full circum-Arctic perspective), we as-sume that any increase in the area of anaerobic pools (wetland or thermokarst lake) will THANKS TO THE REFEREES’ COMMENTS, THE DISCUSSION AND, IN Reply: At all stations, in situ oxygen concentrations were above 90% saturation. Hence, the potential change of oxygen due to air bubbling was minimal. Therefore, the bubbling in cores designed for microsensors measurements was lightly performed, using a fine airbubble
INTERACTIVE COMMENT ON “MODELING THE IMPACT OF SOIL BGD 9, C7639–C7642, 2013 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper Biogeosciences Discuss., 9, C7639–C7642, 2013 INTERACTIVE COMMENT ON NITROGEN CYCLING IN know anything more about N cycling in models than I did before. I feel, the results from these models need to be analyzed and reported in a much more clever way to provideTRICHODESMIUM
Dupouy and coauthors have proposed a rather intriguing approach to detecting Trichodesmium using satellite derived ocean color data. This is an important problem that has vexed the community for a long time and every new approach BGD - EFFECTS OF OCEAN ACIDIFICATION ON THE LARVAL GROWTH Abstract. Little is known about how marine fishes respond to the reduced pH condition caused by the increased CO 2 in the atmosphere. We investigated the effects of CO 2 concentra INTERACTIVE COMMENT ON “SPECIFIC RATES OF LEUCINE BGD 7, C4012–C4020, 2010 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper Biogeosciences Discuss., 7, C4012–C4020, 2010 INTERACTIVE COMMENT ON “ESTIMATING GLOBAL CARBON UPTAKE BY BGD 10, C1114–C1117, 2013 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper Biogeosciences Discuss., 10, C1114–C1117, 2013 INTERACTIVE COMMENT “DIRECT OBSERVATION OF BGD 10, C1612–C1615, 2013 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper extension in the central pacific, we RECEIVED AND PUBLISHED: 25 OCTOBER 2012 meaningfully. Much to my regret I therefore cannot recommend to publish the study in Biogeosciences, although, apart from the way of parameterization the whole study is RECEIVED AND PUBLISHED: 25 APRIL 2015 over anaerobic landscapes (considered from a full circum-Arctic perspective), we as-sume that any increase in the area of anaerobic pools (wetland or thermokarst lake) will THANKS TO THE REFEREES’ COMMENTS, THE DISCUSSION AND, IN Reply: At all stations, in situ oxygen concentrations were above 90% saturation. Hence, the potential change of oxygen due to air bubbling was minimal. Therefore, the bubbling in cores designed for microsensors measurements was lightly performed, using a fine airbubble
INTERACTIVE COMMENT ON “MODELING THE IMPACT OF SOIL BGD 9, C7639–C7642, 2013 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper Biogeosciences Discuss., 9, C7639–C7642, 2013 INTERACTIVE COMMENT ON NITROGEN CYCLING IN know anything more about N cycling in models than I did before. I feel, the results from these models need to be analyzed and reported in a much more clever way to provideTRICHODESMIUM
Dupouy and coauthors have proposed a rather intriguing approach to detecting Trichodesmium using satellite derived ocean color data. This is an important problem that has vexed the community for a long time and every new approachAnnales Geophysicae
Atmospheric Chemistry & Physics Atmospheric Measurement TechniquesBiogeosciences
Climate of the Past
Earth Surface Dynamics Earth System DynamicsGeochronology
Geoscience Communication Geoscientific Instrumentation, Methods and Data Systems Geoscientific Model Development Hydrology and Earth System Sciences Natural Hazards and Earth System Sciences Nonlinear Processes in GeophysicsOcean Science
Solid Earth
SOIL
The Cryosphere
Weather and Climate DynamicsPROCEEDINGS
Advances in GeosciencesCOMPILATION
Encyclopedia of Geosciences Journal cover Journal topic BIOGEOSCIENCES An interactive open-access journal of the EuropeanGeosciences Union
Journal topic
BG
__ __ __ __ __
* Articles & preprints* Submission
* Policies
* Peer review
* Editorial board
* About
* EGU publications
* Manuscript tracking * Articles & preprints* Recent
* Articles
* Preprints
* Highlight articles* Special issues
* Published SIs
* Scheduled SIs
* How to apply for an SI* Alerts
* Subscribe to alerts* Submission
* Policies
* Licence & copyright* General terms
* Publication policy* Data policy
* Publication ethics * Competing interests policy * Appeals & complaints * Proofreading guidelines * Obligations for authors * Obligations for editors * Obligations for referees* Peer review
* Interactive review process* Finding an editor
* Review criteria
* Manuscript tracking * Reviewer recognition* Editorial board
* About
* Aims & scope
* Subject areas
* Manuscript types
* Article processing charges* Financial support
* News & press
* Promote your work
* Journal statistics* Journal metrics
* Abstracted & indexed * Article level metrics* FAQs
* Contact
* XML harvesting & OAI-PMH* EGU publications
* Manuscript tracking__ __ __ __ __
* EGU.eu
* EGU Publications
* EGU Highlight Articles AuthorTitleAbstractFull text * Articles & preprints* Submission
* Policies
* Peer review
* Editorial board
* About
* EGU publications
* Manuscript tracking * Articles & preprints* Recent
* Articles
* Preprints
* Highlight articles* Special issues
* Published SIs
* Scheduled SIs
* How to apply for an SI* Alerts
* Subscribe to alerts* Submission
* Policies
* Licence & copyright* General terms
* Publication policy* Data policy
* Publication ethics * Competing interests policy * Appeals & complaints * Proofreading guidelines * Obligations for authors * Obligations for editors * Obligations for referees* Peer review
* Interactive review process* Finding an editor
* Review criteria
* Manuscript tracking * Reviewer recognition* Editorial board
* About
* Aims & scope
* Subject areas
* Manuscript types
* Article processing charges* Financial support
* News & press
* Promote your work
* Journal statistics* Journal metrics
* Abstracted & indexed * Article level metrics* FAQs
* Contact
* XML harvesting & OAI-PMH* EGU publications
* Manuscript tracking * Articles & preprints* Recent
* Articles
* Preprints
* Highlight articles* Special issues
* Published SIs
* Scheduled SIs
* How to apply for an SI* Alerts
* Subscribe to alerts* Submission
* Policies
* Peer review
* Editorial board
* About
* EGU publications
User ID
Password
New user? |
Lost login?
Follow
@EGU_BioGeo
JOURNAL METRICS
IF3.480
IF 5-year
4.194
CiteScore
6.7
SNIP1.143
IPP3.65
SJR1.761
Scimago H
index118
h5-index60
Definitions
ABSTRACTED/INDEXED
ABSTRACTED/INDEXED
* Science Citation Index Expanded * Current Contents/ABE * Current Contents/PCE* Scopus
* ADS
* AGRICOLA
* Aquatic Sciences and Fisheries Abstracts* CAB Abstracts
* Cabell's
* Chemical Abstracts* CLOCKSS
* CNKI
* DOAJ
* EBSCO
* GBA
* Gale/Cengage
* GeoBase
* GeoRef
* GoOA (CAS)
* Google Scholar
* J-Gate
* Portico
* ProQuest
* World Public Library* Recent
* By topics
* By MS types
* Most downloaded
* Most commented
* Journal volumes
* Preprints
The following lists only preprints without a corresponding finalrevised paper.
Categories and time range can be adjusted through the filter __. This library is optimized for JavaScript. Please consider activating JavaScript in your browser. The following shows the preprints published in the last 12 months. * Manuscripts in open discussion * Revised manuscript not (yet) submitted * Revised manuscript under review for BG * Revised manuscript accepted for BG * Manuscript withdrawn or not accepted today1M3M6M12M24M60M2004 Please choose a category. Please change your selection of categoryand/or time.
25 Nov 2020 Assessing Climate Change Impacts on Live Fuel Moisture and Wildfire Risk Using a Hydrodynamic Vegetation Model Wu Ma, Lu Zhai, Alexandria Pivovaroff, Jacquelyn Shuman, Polly Buotte, Junyan Ding, Bradley Christoffersen, Max Moritz, Charles D. Koven, Lara Kueppers, and Chonggang Xu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-430,https://doi.org/10.5194/bg-2020-430,2020
Preprint under review for BG (discussion: open, 0 comments) 25 Nov 2020 Biogeochemical and plant trait mechanisms drive enhanced methane emissions in response to whole-ecosystem warming Genevieve L. Noyce and J. Patrick Megonigal Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-376,https://doi.org/10.5194/bg-2020-376,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Methane (CH4) is a potent greenhouse gas that contributes to global radiative forcing. A mechanistic understanding of how wetland CH4 cycling will respond to global warming is crucial for improving prognostic models. We present results from the first four years of a novel whole-ecosystem warming experiment in a coastal wetland, showing that warming increases CH4 emissions and identifying four potential mechanisms that can be added to future modeling efforts.Hide
24 Nov 2020 Development of global temperature and pH calibrations based on bacterial 3-hydroxy fatty acids in soils Pierre Véquaud, Sylvie Derenne, Alexandre Thibault, Christelle Anquetil, Giuliano Bonanomi, Sylvie Collin, Sergio Contreras, Andrew Nottingham, Pierre Sabatier, Norma Salinas, Wesley Philip Scott, Josef P. Werne, and Arnaud Huguet Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-428,https://doi.org/10.5194/bg-2020-428,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
A better understanding of past climate variations is essential to apprehend future climatic changes. Most of the available paleoenvironmental proxies were developed and used in oceanic environments. Nevertheless, it is essential to have reliable proxies which can be applied to continental archives. The aim of this study is to investigate the applicability of specific organic compounds, 3-hydroxy fatty acids, as temperature and pH proxies at the global level using an extended soil dataset.Hide
24 Nov 2020 Do marine benthos breathe what they eat? Xiaoguang Ouyang, Cheuk Yan Lee, and Shing Yip Lee Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-424,https://doi.org/10.5194/bg-2020-424,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
We used the gas isotope of marine macrobenthos respired carbon dioxide to track their immediate and integrated food. This is a new paradigm called You breathe what you eat, which adds to the existing paradigm of You are what you eat in food web studies. The new paradigm reflects macrobenthos' feeding habit and taxa. Our data also show carbon dioxide fluxes respired by marine macrobenthos are related to their sizes. This will help to better constrain carbon fluxes contributed by macrobenthos.Hide
24 Nov 2020 Hypersaline tidal flats as important Blue Carbon systems: A case study from three ecosystems Dylan R. Brown, Humberto Marrota, Roberta B. Peixoto, Alex Enrich-Prast, Glenda C. Barroso, Mario L. G. Soares, Wilson Machado, Alexander Pérez, Joseph M. Smoak, Luciana M. Sanders, Stephen Conrad, James Z. Sippo, Isaac R. Santos, Damien T. Maher, and Christian J.Sanders
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-426,https://doi.org/10.5194/bg-2020-426,2020
Preprint under review for BG (discussion: open, 0 comments) 23 Nov 2020 Contribution of the nongrowing season to annual N2O emissions from the continuous permafrost region in Northeast China Weifeng Gao, Dawen Gao, Liquan Song, Houcai Sheng, Tijiu Cai, and HongLiang
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-305,https://doi.org/10.5194/bg-2020-305,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
The N2O emissions ranged from −35.75 to 74.16 μg·m−2·h−1 during the nongrowing season in the permafrost region. The nongrowing season N2O emissions ranged from 0.89 to 1.44 kg ha−1, which contributed to 41.96–53.73 % of the annual budget, accounting for almost half of the annual emissions in the permafrost region. Nongrowing season N2O emissions is an important component of annual emissions and cannot be ignored in the permafrost region.Hide
21 Nov 2020 Cambial-age related correlations of stable isotopes and tree-ring widths in wood samples of tree-line conifers Tito Arosio, Malin M. Ziehmer-Wenz, Kurt Nicolussi, Christian Schlüchter, and Markus Leuenberger Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-406,https://doi.org/10.5194/bg-2020-406,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
A recent analysis of stable isotopes of samples from larch and cembran trees, revealed that δD and δ18O exhibit no trends in adult trees, but trends in the juvenile period. In this work we applied a correlation analysis on different cambial age to verify if these changes were correlated with tree-ring width values. The results prove a significant correlation between tree-ring-width and both hydrogen and oxygen stable isotopes before 100 year of cambial age, but not afterwards, in both species.Hide
20 Nov 2020 Recent above-ground biomass changes in central Chukotka (Russian Far East) using field sampling and Landsat satellite data Iuliia Shevtsova, Ulrike Herzschuh, Birgit Heim, Luise Schulte, Simone Stünzi, Luidmila A. Pestryakova, Evgeniy S. Zakharov, and StefanKruse
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-416,https://doi.org/10.5194/bg-2020-416,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
In the light of climate changes of subarctic regions, notable general increase in above-ground biomass for the past 15 years (2000 to 2017) was estimated along a tundra-taiga gradient of central Chukotka (Russian Far East). The greatest increase occurred in the northern taiga in the areas of larch closed-canopy forest expansion with Cajander larch as a main contributor. For the estimations, we used field data (taxa-separated plant biomass, 2018) and upscaled it based on Landsat satellite data.Hide
20 Nov 2020 Divergent climate feedbacks in the growing period and the dormancy period to sowing date shift of winter wheat in the NorthChina Plain
Fengshan Liu, Ying Chen, Nini Bai, Dengpan Xiao, Huizi Bai, Fulu Tao,and Quansheng Ge
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-388,https://doi.org/10.5194/bg-2020-388,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
The sowing date is the key to the surface biophysical processes in winter dormancy period. The climate effect of sowing date shift is therefore very interesting and may contributed to the mitigation of climate change. Earlier sowing date always had higher LAI, but higher temperature in the dormancy and lower temperature in the growth period. The main reason was the relative contributions of surface albedo process and energy partitioning process.Hide
19 Nov 2020 Reviews and syntheses: Gaining insights into evapotranspiration partitioning with novel isotopic monitoring methods Youri Rothfuss, Maria Quade, Nicolas Brüggemann, Alexander Graf, Harry Vereecken, and Maren Dubbert Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-414,https://doi.org/10.5194/bg-2020-414,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
The partitioning of evapotranspiration into evaporation from soil and transpiration from plants is crucial for a wide range of parties, from farmers to policy makers. In this work, we focus on a particular partitioning method, based on the stable isotopic analysis of water. In particular, we aim at highlighting the challenges that this method is currently facing and, in light of recent methodological developments, propose ways forward for the isotopic partitioningcommunity.
Hide
18 Nov 2020 Multi-compartment kinetic-allometric model of radionuclide bioaccumulation in marine fish Roman Bezhenar, Kyeong Ok Kim, Vladimir Maderich, Govert de With, andKyung Tae Jung
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-423,https://doi.org/10.5194/bg-2020-423,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
A new approach to predicting the accumulation of radionuclides in fish taking into account heterogeneity of distribution of contamination in the organism and dependence of metabolic process rates on the fish mass was developed. Predicted concentrations of radionuclides in fish agreed well with the laboratory and field measurements. The model with the defined generic parameters could be used in marine environments without local calibration, which is important for emergency decision support.Hide
18 Nov 2020 Influence of atmospheric deposition on biogeochemical cycles in an oligotrophic ocean system France Van Wambeke, Vincent Taillandier, Karine Deboeufs, Elvira Pulido-Villena, Julie Dinasquet, Anja Engel, Emilio Marañón, Céline Ridame, and Cécile Guieu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-411,https://doi.org/10.5194/bg-2020-411,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Simultaneous _in situ_ measurements of (dry and wet) atmospheric deposition, and biogeochemical stocks and fluxes in the sunlight waters of the open Mediterranean Sea revealed complex physical and biological processes. Dry N deposition contributed moderately to the N biological demand in the mixed layer (11 % for primary producers, 27 % for heterotrophic bacteria). The transitory effect observed after a wet dust deposition impacted the microbial food web down tothe DCM.
Hide
18 Nov 2020 Sources of Fe-binding organic ligands in surface waters of the western Antarctic Peninsula Indah Ardiningsih, Kyyas Seyitmuhammedov, Sylvia G. Sander, Claudine H. Stirling, Gert-Jan Reichart, Kevin R. Arrigo, Loes J. A. Gerringa,and Rob Middag
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-357,https://doi.org/10.5194/bg-2020-357,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Organic Fe speciation is investigated along a natural gradient of the western Antarctic Peninsula, from an ice-covered shelf to the open ocean. The two major fronts in the region affect the distribution of ligands. The excess ligands not bound to DFe comprised up to 80 % of the total ligand concentrations, implying the potential to solubilize additional Fe input. The ligands on the shelf can increase the DFe residence time and fuel local primary production upon ice melt.Hide
17 Nov 2020 Drivers of the variability of the isotopic composition of water vapor in the surface boundary layer Jelka Braden-Behrens, Lukas Siebicke, and Alexander Knohl Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-398,https://doi.org/10.5194/bg-2020-398,2020
Preprint under review for BG (discussion: open, 0 comments) 16 Nov 2020 The role of termite CH4 emissions on ecosystem scale: a case study in the Amazon rain forest Hella van Asperen, João Rafael Alves-Oliveira, Thorsten Warneke, Bruce Forsberg, Alessandro Carioca de Araujo, and Justus Notholt Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-384,https://doi.org/10.5194/bg-2020-384,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Termites are insects which are highly abundant in tropical ecosystems. It is known that termites emit CH4, an important greenhouse, but their absolute emission remains uncertain. In the Amazon rain forest, we measured CH4 emissions from termite nests and groups of termites. In addition, we tested a fast and non-destructive field method to estimate termite nest colony size. We found that termites play a significant role in the ecosystems CH4 budget, and probably emit more than currently assumed.Hide
14 Nov 2020 Compound high temperature and low chlorophyll extremes in the ocean over the satellite period Natacha Le Grix, Jakob Zscheischler, Charlotte Laufkötter, Cécile S. Rousseaux, and Thomas L. Frölicher Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-412,https://doi.org/10.5194/bg-2020-412,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Marine ecosystems could suffer severe damage from the co-occurrence of a marine heatwave with extremely low chlorophyll concentration. Here, we provide a first assessment of compound marine heatwave and low chlorophyll events in the global ocean from 1998 to 2018. We reveal hotspots of these compound events in the equatorial Pacific and in the Arabian Sea, show that they mostly occur in summer at high latitudes, and that their frequency is modulated by large-scale modes of climate variability.Hide
14 Nov 2020 CO2 fertilization effect can cause rainfall decrease as strong as large-scale deforestation in the Amazon Gilvan Sampaio, Marília Shimizu, Carlos A. Guimarães-Júnior, Felipe Alexandre, Manoel Cardoso, Tomas F. Domingues, Anja Rammig, Celso von Randow, Luiz F. C. Rezende, and David M. Lapola Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-386,https://doi.org/10.5194/bg-2020-386,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
The impact of large-scale deforestation and the physiological effects of elevated atmospheric CO2 on Amazon rainfall are systematically compared in this study. Our results are remarkable in showing that the two disturbances cause equivalent rainfall decrease, though through different causal mechanisms. These results highlight the importance of not only curbing regional deforestation but also reducing global CO2 emissions to avoid climatic changes in the Amazon.Hide
14 Nov 2020 Different responses of CO2, CH4, and N2O fluxes to seasonally asymmetric warming in an alpine grassland of TianshanMountains
Yanming Gong, Ping Yue, Kaihui Li, Anwar Mohammat, and Yanyan Liu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-396,https://doi.org/10.5194/bg-2020-396,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
At present, data on the influence of asymmetric warming on the GHG flux on a temporal scale is scarce. GHG fluxes were measured using static chambers and a gas chromatograph. Our study showed that the effect of seasonally asymmetrical warming on CO2 flux was obvious, with the GHG flux being able to adapt to continuous warming. Warming in the nongrowing season increased the temperature dependence of GHGflux.
Hide
14 Nov 2020 Decoupling salinity and carbonate chemistry: Low calcium ion concentration rather than salinity limits calcification in BalticSea mussels
Trystan Sanders, Jörn Thomsen, Jens Daniel Müller, Gregor Rehder,and Frank Melzner
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-382,https://doi.org/10.5194/bg-2020-382,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Salinity in the Baltic Sea is predicted to decrease over the next century due to climate change. This has implications for habitat forming mussels which utilize dissolved seawater ions to build calcium carbonate shells. Combining laboratory experiments with field monitoring reveals that calcium ion limitation is the primary factor limiting shell growth in mussels at low salinities with potential implications for future Baltic Sea ecosystems.Hide
13 Nov 2020 Global geographic variability in freshwater methane hydrogen isotope ratios and its implications for emissions source apportionment and microbial biogeochemistry Peter M. J. Douglas, Emerald Stratigopoulos, Jenny Park, and DawsonPhan
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-410,https://doi.org/10.5194/bg-2020-410,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Hydrogen isotopes could be a useful tool to help resolve the geographic distribution of methane emissions from freshwater environments. We analyzed a global dataset of freshwater methane hydrogen isotope ratios, and found significant geographic variation linked to precipitation isotopic composition. This geographic variability could be used to resolve changing methane fluxes from freshwater environments, and provide more accurate estimates of the relative balance of global methane sources.Hide
13 Nov 2020 Spatiotemporal patterns of N2 fixation in coastal waters derived from rate measurements and remote sensing Mindaugas Zilius, Irma Vybernaite-Lubiene, Diana Vaiciute, Donata Overlingė, Evelina Grinienė, Anastasija Zaiko, Stefano Bonaglia, Iris Liskow, Maren Voss, Agneta Andersson, Sonia Brugel, Tobia Politi, and Paul A. Bukaveckas Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-419,https://doi.org/10.5194/bg-2020-419,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
In fresh and brackish waters, algal blooms are often dominated by cyanobacteria, which have the ability to utilize atmospheric nitrogen. Cyanobacteria are also unusual in that they float to the surface and are dispersed by wind-driven currents. Their patchy and dynamic distribution makes it difficult to track their abundance and quantify their effects on nutrient cycling. We used remote sensing to map the distribution of cyanobacteria in a large Baltic lagoon and quantify their contributions.Hide
13 Nov 2020 Manifestations and environmental implications of microbially-induced calcium carbonate precipitation (MICP) by the cyanobacterium _Dolichospermum flosaquae_ Refat Abdel-Basset, Elhagag Ahmed Hassan, and Hans-Peter Grossart Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-378,https://doi.org/10.5194/bg-2020-378,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
This work was planned and implemented to evaluate the capacity of the Cyanobacterium _Dolichospermum flosaquae_ in microbially induced calcium carbonate precipitation (MICP), which in turn exerts numerous impacts in biogeochemistry of freshwater lakes. MICP is also a determinant of atmospheric carbon emission and eutrophication. Calcium citrate was the most inductive for MICP powered by photosynthesis. The results can be modeled for the implications of MICP in biogeochemical cycles of Ca, C & P.Hide
11 Nov 2020 Quantifying the Importance of Antecedent Fuel-Related Vegetation Properties for Burnt Area using Random Forests Alexander Kuhn-Régnier, Apostolos Voulgarakis, Peer Nowack, Matthias Forkel, I. Colin Prentice, and Sandy P. Harrison Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-409,https://doi.org/10.5194/bg-2020-409,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Along with current climate, vegetation, and human influences, long-term accumulation of biomass affects fires. Here, we find that including the influence of antecedent vegetation and moisture improves our ability to predict global burnt area. Additionally, the length of the preceding period which needs to be considered for accurate predictions varies across regions.Hide
11 Nov 2020 First Pan-Arctic Assessment of Dissolved Organic Carbon in Permafrost-Region Lakes Lydia Stolpmann, Caroline Coch, Anne Morgenstern, Julia Boike, Michael Fritz, Ulrike Herzschuh, Kathleen Stoof-Leichsenring, Yury Dvornikov, Birgit Heim, Josefine Lenz, Amy Larsen, Katey Walter Anthony, Benjamin Jones, Karen Frey, and Guido Grosse Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-408,https://doi.org/10.5194/bg-2020-408,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Our new database summarizes DOC results of 2,167 water samples from 1,833 lakes in permafrost regions across the Arctic to provide insights for linkages between DOC and environment. We found increasing lake DOC concentration with decreasing permafrost extent and higher DOC concentrations in boreal permafrost sites compared to tundra sites. Our study shows that DOC concentration depends on the environmental properties of a lake, especially on permafrost extent, ecoregion, and vegetation.Hide
11 Nov 2020 Wildfire history of the boreal forest of southwestern Yakutia (Siberia) over the last two millennia documented by a lake-sedimentary charcoal record Ramesh Glückler, Ulrike Herzschuh, Stefan Kruse, Andrei Andreev, Stuart Andrew Vyse, Bettina Winkler, Boris K. Biskaborn, Luidmila Pestryakova, and Elisabeth Dietze Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-415,https://doi.org/10.5194/bg-2020-415,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Data about past fire activity is very sparse in Siberia. This study presents a first high-resolution record of charcoal particles from lake sediments in boreal eastern Siberia. It indicates that current levels of charcoal accumulation are not unprecedented. While a recent increase in reconstructed fire frequency coincides with rising temperatures and increasing human activity, vegetation composition does not seem to be a major driver behind changes of the fire regime in the past two millennia.Hide
10 Nov 2020 Variability of North Atlantic CO2 fluxes for the2000–2017 period
Zhaohui Chen, Parvadha Suntharalingam, Andrew J. Watson, Ute Schuster, Jiang Zhu, and Ning Zeng Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-385,https://doi.org/10.5194/bg-2020-385,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
As the global temperature continues to increase, carbon dioxide (CO2) is a major driver of this global warming. The increased CO2 is mainly caused by emissions from fossil fuel use and land use. At the same time, the ocean is a significant sink in the carbon cycle. North Atlantic is a critical ocean region in reducing CO2 concentration. We estimate the CO2 uptake in this region based on a carbon inverse system and atmospheric CO2 observations.Hide
09 Nov 2020 Carbon storage in phosphorus limited grasslands may decline in response to elevated nitrogen deposition: a long-term field manipulation and modelling study Christopher R. Taylor, Victoria Janes-Bassett, Gareth Phoenix, Ben Keane, Iain P. Hartley, and Jessica A. C. Davies Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-392,https://doi.org/10.5194/bg-2020-392,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
We used experimental data to model grasslands of contrasting nutrient limitation to investigate their response to nitrogen (N) deposition. We show that when N limits plant growth, deposition stimulated plant carbon (C) input to the soil, but when phosphorus (P) was limiting, we found the reverse; N deposition exacerbated P demand and reduced plant C input. This caused more C to be released into the atmosphere than is taken in, reducing the climate-mitigation capacity of the P-limitedgrassland.
Hide
06 Nov 2020 Technical Note: Uncovering the influence of methodological variations on the extractability of iron bound organiccarbon
Ben J. Fisher, Johan C. Faust, Oliver W. Moore, Caroline L. Peacock,and Christian März
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-399,https://doi.org/10.5194/bg-2020-399,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
One way to remove carbon dioxide from the atmosphere is to store it in the seafloor, minerals can act to preserve seafloor carbon by preventing microbes from breaking it down. We can use a chemical method to tell us how much of this seafloor carbon is protected by iron minerals (how much will be preserved). However, different scientists use different versions of this method which makes results hard to compare. Here we make an assessment of these various methods to determine the best approach.Hide
06 Nov 2020 Lignin oxidation products in soil, dripwater and speleothems from four different sites in New Zealand Inken Heidke, Adam Hartland, Denis Scholz, Andrew Pearson, John Hellstrom, Sebastian F. M. Breitenbach, and Thorsten Hoffmann Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-345,https://doi.org/10.5194/bg-2020-345,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
We analyzed lignin oxidation products (LOPs) in leaf litter and different soil horizons as well as dripwater and flowstone samples from four different cave sites from different vegetation zones in New Zealand using liquid chromatography coupled to mass spectrometry. We test whether the original source-dependent LOP signal of the overlying vegetation is preserved and can be recovered from flowstone samples and investigate how the signal is altered by the transport from thesoil to the cave.
Hide
05 Nov 2020 Reviews and Syntheses: Impacts of plant silica – herbivore interactions on terrestrial biogeochemical cycling Bernice C. Hwang and Daniel B. Metcalfe Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-397,https://doi.org/10.5194/bg-2020-397,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Despite growing recognition of herbivores as important ecosystem engineers, many major gaps remain in our understanding of how silicon and herbivory interact to shape biogeochemical processes. We highlight the need for more research particularly in natural settings as well as on the potential effects of herbivory on terrestrial silicon cycling to understand potentially critical animal-plant-soil feedbacks.Hide
05 Nov 2020 Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas Charlotte L. Spencer-Jones, Erin L. McClymont, Nicole J. Bale, Ellen C. Hopmans, Stefan Schouten, Juliane Müller, E. Povl Abrahamsen, Claire Allen, Torsten Bickert, Claus-Dieter Hillenbrand, Elaine Mawbey, Victoria Peck, Aleksandra Svalova, and James A. Smith Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-333,https://doi.org/10.5194/bg-2020-333,2020
Preprint under review for BG (discussion: open, 0 comments) 05 Nov 2020 Calibration of Mg / Ca and Sr / Ca in coastal marine ostracods as proxy of temperature Maximiliano Rodríguez and Christelle Not Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-343,https://doi.org/10.5194/bg-2020-343,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Mg / Ca in calcium carbonate shells of marine organisms such as foraminifera and ostracods has been used as a proxy to reconstruct water temperature. Here we provide new Mg / Ca-T calibrations for two shallow marine species of ostracods. We show that the water temperature in Spring produces the best calibrations, which suggests the potential use of ostracod shells to reconstruct this parameter ata seasonal scale.
Hide
05 Nov 2020 Carbonyl Sulfide: Comparing a Mechanistic Representation of the Vegetation Uptake in a Land Surface Model and the Leaf RelativeUptake Approach
Fabienne Maignan, Camille Abadie, Marine Remaud, Linda M. J. Kooiijmans, Kukka-Maaria Kohonen, Róisín Commane, Richard Wehr, J. Elliott Campbell, Sauveur Belviso, Stephen A. Montzka, Nina Raoult, Ulli Seibt, Yoichi P. Shiga, Nicolas Vuichard, Mary E. Whelan, andPhilippe Peylin
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-381,https://doi.org/10.5194/bg-2020-381,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
The assimilation of Carbonyl Sulfide (COS) by continental vegetation has been proposed as a proxy for Gross Primary Production (GPP). Using a land surface and a transport models, we compare a mechanistic representation of the plant COS uptake (Berry et al., 2013), to the classical Leaf Relative Uptake (LRU) approach linking GPP and vegetation COS fluxes. We show that at high temporal resolutions a mechanistic approach is mandatory, but at large scales the LRU approach compares similarly.Hide
05 Nov 2020 Microbial activity, methane production, and carbon storage in Early Holocene North Sea peats Tanya J. R. Lippmann, Michiel H. in 't Zandt, Nathalie N. L. Van der Putten, Freek S. Busschers, Marc P. Hijma, Pieter van der Velden, Tim de Groot, Zicarlo van Aalderen, Ove H. Meisel, Caroline P. Slomp, Helge Niemann, Mike S. M. Jetten, Han A. J. Dolman, and Cornelia U.Welte
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-383,https://doi.org/10.5194/bg-2020-383,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
This paper is a step towards understanding the roles of microbial species at the ecosystem scale. The presence of methane, in situ methanogenic micro-organisms, the absence of methanotrophy, consistent vegetation, and large widespread stores of carbon hold the potential for GHG production if catalysed by a change in environmental conditions. Quantification of methane and carbon stores in Early Holocene submerged North Sea peatlands reduces uncertainty in globalaccounting.
Hide
04 Nov 2020 The decline of alpine lichen heaths generates atmospheric heating but subsurface cooling during the growing season Peter Aartsma, Johan Asplund, Arvid Odland, Stefanie Reinhardt, andHans Renssen
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-407,https://doi.org/10.5194/bg-2020-407,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
In the literature, it is generally assumed that alpine lichen heaths keep their direct environment cool due to their relatively high albedo. However, we reveal that the soil temperature and soil heat flux are higher below lichens than below shrubs during the growing season, despite a lower net radiation for lichens. We also show that the difference in microclimatic conditions between these two vegetation types are more pronounced during warm and sunny days than during cold and cloudy days.Hide
04 Nov 2020 Evaluating the potential for Archaea to serve as ice nucleating particles Jessie M. Creamean, Julio E. Ceniceros, Lilyanna Newman, Allyson D. Pace, Thomas C. J. Hill, Paul J. DeMott, and Matthew E. Rhodes Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-367,https://doi.org/10.5194/bg-2020-367,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Microorganisms have the unique ability to form ice in clouds at relatively warm temperatures, especially specific types of plant bacteria. However, to date, members of the domain Archaea have not been evaluated for their cloud forming capabilities. Here, we show the first results of archaea that have the ability to form cloud ice at moderate supercooled temperatures that are found in hypersaline environments on Earth.Hide
04 Nov 2020 Retrieval and validation of forest background reflectivity from daily MODIS bidirectional reflectance distribution function (BRDF) data across European forests Jan Pisek, Angela Erb, Lauri Korhonen, Tobias Biermann, Arnaud Carrara, Edoardo Cremonese, Matthias Cuntz, Silvano Fares, Giacomo Gerosa, Thomas Grünwald, Niklas Hase, Michal Heliasz, Andreas Ibrom, Alexander Knohl, Johannes Kobler, Bart Kruijt, Holger Lange, Leena Leppänen, Jean-Marc Limousin, Francisco Ramon Lopez Serrano, Denis Loustau, Petr Lukeš, Lars Lundin, Riccardo Marzuoli, Meelis Mölder, Leonardo Montagnani, Johan Neirynck, Matthias Peichl, Corinna Rebmann, Eva Rubio, Margarida Santos-Reis, Crystal Schaaf, Marius Schmidt, Guillaume Simioni, Kamel Soudani, and Caroline Vincke Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-360,https://doi.org/10.5194/bg-2020-360,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Understory vegetation is the most diverse, least understood component of forests worldwide. Understory communities are important as drivers of overstory succession, nutrient cycling. Multi-angle remote sensing enables us now to describe surface properties by means that are not possible using mono-angle data. Evaluated over an extensive set of forest ecosystem experimental sites in Europe, here reported method can deliver good retrievals especially over different forest typeswith open canopies.
Hide
04 Nov 2020 Ideas and perspectives: Biogeochemistry – Its Future Role in Interdisciplinary Frontiers Thomas S. Bianchi, Madhur Anand, Chris T. Bauch, Donald E. Canfield, Luc De Meester, Katja Fennel, Peter M. Groffman, Michael L. Pace, Mak Saito, and Myrna J. Simpson Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-395,https://doi.org/10.5194/bg-2020-395,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
Better development of interdisciplinary linkages ties between biology, geology, and chemistry advance biogeochemistry through: 1) better integration of contemporary (or rapid) evolutionary adaptation to predict changing biogeochemical cycles, 2) universal integration of data from long-term monitoring sites in terrestrial, aquatic, and human systems, that span broad geographical regions for use inmodeling.
Hide
04 Nov 2020 Sources and cycling of nitrogen in a New England river discerned from nitrate isotope ratios Veronica R. Rollinson, Julie Granger, Sydney C. Clark, Mackenzie L. Blanusa, Claudia P. Koerting, Jamie M. P. Vaudrey, Lija A. Treibergs, Holly C. Westbrook, Catherine M. Matassa, Meredith K. Hastings, andCraig R. Tobias
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-390,https://doi.org/10.5194/bg-2020-390,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
We measured nutrients and the naturally occurring nitrogen (N) and oxygen (O) stable isotope ratios of nitrate discharged from a New England river over an annual cycle, to monitor N loading and identify dominant sources from the watershed. We uncovered a seasonality to loading and sources of N from the watershed. Seasonality in the nitrate isotope ratios also informed on N cycling, conforming to theoretical expectations of riverine nutrient cycling.Hide
03 Nov 2020 Ideas and Perspectives: When ocean acidification experiments are not the same, reproducibility is not tested Phillip Williamson, Hans-Otto Pörtner, Steve Widdicombe, andJean-Pierre Gattuso
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-394,https://doi.org/10.5194/bg-2020-394,2020
Preprint under review for BG (discussion: open, 3 comments) Shortsummary
Short summary
The reliability of ocean acidification research was challenged in early 2020 when a high-profile paper failed to corroborate previously-observed impacts of high CO2 on the behaviour of coral reef fish. We now know the reason why: the replicated studies differed in many ways. Open-minded and collaborative assessment of all research results, both negative and positive, remains the best way to develop process-based understanding of the impacts of ocean acidification onmarine organisms.
Hide
02 Nov 2020 Key drivers of pyrogenic carbon redistribution during a simulated rainfall event Severin-Luca Bellè, Asmeret Asefaw Berhe, Frank Hagedorn, Cristina Santin, Marcus Schiedung, Ilja van Meerveld, and Samuel Abiven Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-361,https://doi.org/10.5194/bg-2020-361,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
Controls of pyrogenic carbon (PyC) redistribution under rainfall are largely unknown. However, PyC mobility can be substantial after initial rain in post-fire landscapes. We conducted a controlled simulation experiment on plots where PyC was applied on the soil surface. We identified redistribution of PyC by runoff and splash, and vertical movement in the soil depending on soil texture and PyC characteristics (material and size). PyC also induced changes in exports of native soil organic carbon.Hide
30 Oct 2020 Complex interactions of in-stream DOM and nutrient spiralling unravelled by Bayesian regression analysis Matthias Pucher, Peter Flödl, Daniel Graeber, Klaus Felsenstein, Thomas Hein, and Gabriele Weigelhofer Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-372,https://doi.org/10.5194/bg-2020-372,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Dissolved organic matter is an important carbon source in aquatic ecosystems, yet the uptake processes are not totally understood. We found evidence for the release of degradation products, efficiency loss with higher concentrations, stimulating effects and influences from the benthic zone. To conduct this analysis, we included interactions in the equations of the nutrient spiralling concept and solve it by a Bayesian non-linear fitting algorithm.Hide
30 Oct 2020 Novel hydrocarbon-utilizing soil mycobacteria synthesize unique mycocerosic acids at a Sicilian everlasting fire Nadine T. Smit, Laura Villanueva, Darci Rush, Fausto Grassa, Caitlyn R. Witkowski, Mira Holzheimer, Adriaan J. Minnaard, Jaap S. Sinninghe Damsté, and Stefan Schouten Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-349,https://doi.org/10.5194/bg-2020-349,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Soils from an everlasting fire (gas seep) in Sicily, Italy reveal high relative abundances of novel uncultivated mycobacteria and unique 13C depleted mycocerosic acids (multi-methyl branched fatty acids) close to the main gas seep. Our results imply, that mycocerosic acids in combination with their depleted δ13C values offer a new biomarker tool to study the role of soil mycobacteria as hydrocarbon consumers in the modern and past global carbon cycle.Hide
30 Oct 2020 The water column of the Yamal tundra lakes as a microbial filter preventing methane emission Alexander Savvichev, Igor Rusanov, Yury Dvornikov, Vitaly Kadnikov, Anna Kallistova, Elena Veslopolova, Antonina Chetverova, Marina Leibman, Pavel Sigalevich, Nikolay Pimenov, Nikolai Ravin, and ArtemKhomutov
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-317,https://doi.org/10.5194/bg-2020-317,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Microbial processes of the methane cycle were studied in four lakes of the central part of the Yamal Peninsula in the area of continuous permafrost, two large, deep lakes and two small and shallow ones. It was found that only small shallow contributed significantly to the overall diffusive methane emissions from the water surface during the warm summer season. The water column of large deep lakes on Yamal acted as a microbial filter preventing methane emission into theatmosphere.
Hide
29 Oct 2020 Characterising organic carbon sources in Anthropocene affected Arctic upland lake catchments, Disko Island, West Greenland Mark A. Stevenson, Suzanne McGowan, Emma J. Pearson, George E. A. Swann, Melanie J. Leng, Vivienne J. Jones, Joseph J. Bailey, Xianyu Huang, and Erika Whiteford Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-347,https://doi.org/10.5194/bg-2020-347,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
We link detailed stable isotope and biomarker analyses from the catchments of three Arctic upland lakes on Disko Island (West Greenland) to a recent dated sediment core to understand how carbon cycling has changed over the past ~500 years. We find that the carbon deposited in sediments in these upland lakes are predominately sourced from in-lake production due to the catchments limited terrestrial vegetation and elevation and that recent increases in algal production link with climate change.Hide
27 Oct 2020 Rain-fed streams dilute inorganic nutrients but subsidise organic matter-associated nutrients in coastal waters of the northeastPacific Ocean
Kyra A. St. Pierre, Brian P. V. Hunt, Suzanne E. Tank, Ian Giesbrecht, Maartje C. Korver, William C. Floyd, Allison A. Oliver, and Ken P.Lertzman
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-350,https://doi.org/10.5194/bg-2020-350,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Using a four year dataset of paired fresh and marine water quality from British Columbia (Canada), we show that coastal temperate rainforest streams bordering the northeast Pacific Ocean are sources of organic nitrogen, iron and carbon, but not the nutrients that are easily used by marine phytoplankton. This distinction has possibly critical implications for coastal food webs, and highlights the need to sample both fresh and marine waters year-round to fully understandcoastal dynamics.
Hide
26 Oct 2020 Long-term bare fallow soil fractions reveal thermo-chemical properties controlling soil organic carbon dynamics Mathieu Chassé, Suzanne Luftalla, Lauric Cécillon, François Baudin, Samuel Abiven, Claire Chenu, and Pierre Barré Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-176,https://doi.org/10.5194/bg-2020-176,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
Evolution of organic carbon content in soils could be a major driver of atmospheric greenhouse gas concentrations over the next century. Understanding the factors controlling carbon persistence in soil is a challenge. Our study of unique long-term bare fallow samples, depleted in labile organic carbon, helps improve the separation, evaluation and characterisation of carbon pools with distinct residence time in soils and gives insight on the mechanisms explaining soil organic carbonpersistence.
Hide
23 Oct 2020 Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons Lauri Heiskanen, Juha-Pekka Tuovinen, Aleksi Räsänen, Tarmo Virtanen, Sari Juutinen, Annalea Lohila, Timo Penttilä, Maiju Linkosalmi, Juha Mikola, Tuomas Laurila, and Mika Aurela Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-370,https://doi.org/10.5194/bg-2020-370,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
We studied ecosystem and plant community level carbon (C) exchange between subarctic mire and the atmosphere during 2017–2018. We found strong spatial variation in CO2 and CH4 dynamics between the main plant communities. The earlier onset of growing season in 2018 strengthened the CO2 sink of the ecosystem, but this gain was counterbalanced by a later drought period. Variation in water table level, soil temperature and vegetation explained most of the variation in the ecosystem level C exchange.Hide
23 Oct 2020 Arctic aquatic graminoid tundra responses to nutrientavailability
Christian G. Andresen and Vanessa L. Lougheed Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-351,https://doi.org/10.5194/bg-2020-351,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Aquatic tundra plants dominate productivity and methane fluxes in the Arctic coastal plain. We assessed how environmental nutrient availability influences production of biomass and greenness of aquatic tundra. Employing a multivariate analysis, we explained the relationship of soil and water nutrients to plant leaf nutrients. This study highlights the importance of nutrient pools and mobilization between terrestrial-aquatic systems and their influence on regional carbon and energy feedbacks.Hide
22 Oct 2020 Holocene phototrophic community and anoxia dynamics in meromictic Lake Jaczno (NE Poland) using high-resolution hyperspectral imaging and HPLC data Stamatina Makri, Andrea Lami, Luyao Tu, Wojciech Tylmann, Hendrik Vogel, and Martin Grosjean Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-362,https://doi.org/10.5194/bg-2020-362,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
Anoxia in lakes is a major growing concern. In this study we applied a multi-proxy approach combining high-resolution Hyperspectral Imaging (HSI) pigment data with specific HPLC data to examine the Holocene evolution and main drivers of lake anoxia and trophic state changes. Our findings show that when human impact was low, these changes were driven by climate and natural lake–catchment evolution. In the last 500 years, increasing human impact promoted lake eutrophication andpermanent anoxia.
Hide
21 Oct 2020 Functional convergence of biosphere–atmosphere interactions in response to meteorology Christopher Krich, Mirco Migliavacca, Diego G. Miralles, Guido Kraemer, Tarek S. El-Madany, Markus Reichstein, Jakob Runge, andMiguel D. Mahecha
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-374,https://doi.org/10.5194/bg-2020-374,2020
Preprint under review for BG (discussion: open, 8 comments) Shortsummary
Short summary
Ecosystems and the atmosphere interact with each other. These interactions determine e.g. the water and carbon fluxes and thus are crucial to understand climate change effects. We analysed the interactions for many ecosystems across the globe showing that very different ecosystems can have similar interactions with the atmosphere. Meteorological conditions seem to be the strongest interaction-shaping factor. This means that common principles can be identified to describe ecosystem behaviour.Hide
20 Oct 2020 Nitrogen isotopic fractionations during nitric oxide production in an agricultural soil Zhongjie Yu and Emily M. Elliott Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-344,https://doi.org/10.5194/bg-2020-344,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
In this study, we demonstrated distinct nitrogen isotope effects for nitric oxide (NO) production from major microbial and chemical NO sources in an agricultural soil. These results highlight characteristic bond forming and breaking mechanisms associated with microbial and chemical NO production and implicate that simultaneous isotopic analyses of NO and nitrous oxide (N2O) can lead to unprecedented insights into the sources and processes controlling NO and N2O emissions from agricultural soils.Hide
19 Oct 2020 Latitudinal patterns in the concentrations of biologically utilised elements in the surface ocean Daisy Pickup and Toby Tyrrell Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-371,https://doi.org/10.5194/bg-2020-371,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
Concentrations of chemical elements dissolved in seawater differ from place to place in the surface ocean. Understanding how they change, and why, is important, for instance to understand ocean carbon storage or to understand nutrient supply for life in the ocean. We used a new global dataset to study spatial changes of numerous elements, many not studied before. We find a common pattern: an increase from low to high latitudes, because deep water rises to the surface at high latitudes.Hide
17 Oct 2020 Methane in the Danube Delta: The importance of spatial patterns and diel cycles for atmospheric emission estimates Anna Canning, Bernhard Wehrli, and Arne Körtzinger Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-353,https://doi.org/10.5194/bg-2020-353,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Inland waters, are usually not well restrained in terms of greenhouse gas measurements. One of these regions is the Danube River Delta, Romania. Therefore, we measured continuously with sensors to collect high resolution data for CO2, CH4 and O2, throughout the Danube Delta. We found significant variation over the day and night and between regions, for all concentrations. This leads to the implications of spot sampling just during the day, which could potentially lead to vast underestimations.Hide
16 Oct 2020 Patterns of plant rehydration and growth following pulses of soil moisture availability Andrew F. Feldman, Daniel J. Short Gianotti, Alexandra G. Konings, Pierre Gentine, and Dara Entekhabi Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-380,https://doi.org/10.5194/bg-2020-380,2020
Preprint under review for BG (discussion: open, 3 comments) Shortsummary
Short summary
We quantify global plant water uptake durations after rainfall using satellite-based plant water content measurements. In wetter regions, plant water uptake occurs within a day due to rapid coupling between soil and plant water content. Drylands show multi-day plant water uptake after rain pulses, providing widespread evidence for slow rehydration responses and pulse-driven growth responses. Our results suggest that drylands are sensitive to projected shifts in rainfall intensity and frequency.Hide
16 Oct 2020 L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand Nataniel Holtzman, Leander D. L. Anderegg, Simon Kraatz, Alex Mavrovic, Oliver Sonnentag, Christoforos Pappas, Michael H. Cosh, Alexandre Langlois, Tarendra Lakhankar, Derek Tesser, Nicholas Steiner, Andreas Colliander, Alexandre Roy, and Alexandra G. Konings Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-373,https://doi.org/10.5194/bg-2020-373,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
Microwave radiation coming from Earth's land surface is affected by both soil moisture and the water in plants that cover the soil. We measured such radiation with a sensor elevated above a forest canopy, while repeatedly measuring the amount of water stored in trees at the same location. Changes in the microwave signal over time were closely related to tree water storage changes. Satellites with similar sensors could thus be used to monitor how trees in an entire region respond todrought.
Hide
15 Oct 2020 Evaluating the response of ẟ13C in _Haloxylon ammodendron_, a dominant C4 species in Asian desert ecosystem, to water and nitrogen addition as well as the availability of its ẟ13C as the indicator of water use-efficiency Zixun Chen, Xuejun Liu, Xiaoqing Cui, Yaowen Han, Guoan Wang, andJiazhu Li
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-286,https://doi.org/10.5194/bg-2020-286,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
ẟ13C in plants is a sensitive long-term indicator of physiological acclimatization. The present study suggests that precipitation change and increasing atmospheric N deposition have little impact on ẟ13C of _H. ammodendron_, a dominant plant in Central Asia deserts, but affect its gas exchange. In addition, this study shows that ẟ13C of _H. ammodendron_ could not indicate its water use efficiency (WUE), suggesting that whether ẟ13C of C4 plants indicates WUE is species-specific dependent.Hide
15 Oct 2020 Warmer winters causes an increase of chlorophyll-a concentration in deeper layers: the opposite role of convection and self-shading on the example of the Black Sea Elena A. Kubryakova and Arseny A. Kubryakov Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-366,https://doi.org/10.5194/bg-2020-366,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
In this article, we use Bio-Argo data to demonstrate the opposite impact of winter convection and self-shading on chlorophyll's vertical distribution in the Black Sea. During cold winter, a larger amount of nutrients is entrained in the upper layer. The chlorophyll concentration (Chl) in upper layers increases, which shades the deeper layers, where Chl decreases. The opposite is observed in warm years, when light penetrates to the nitrocline and Chl increase in deeperlayers.
Hide
14 Oct 2020 Forest-atmosphere exchange of reactive nitrogen in a low polluted area – temporal dynamics and annual budgets Pascal Wintjen, Frederik Schrader, Martijn Schaap, Burkhard Beudert, and Christian Brümmer Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-364,https://doi.org/10.5194/bg-2020-364,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Eddy covariance flux measurements of total reactive nitrogen (∑Nr) over a low polluted forest were compared to in-situ modeled fluxes, results from a large-scale chemical transport model (CTM), and canopy outflow measurements. Annual dry deposition budgets after 2.5 years of measurements ranged from 4.5 to 7.5 kg N ha−1 a−1, depending on the applied method. Modeled NH3 concentrations were found to be the primary contributor to a mismatch between measured ∑Nr fluxes and those modeled with a CTM.Hide
14 Oct 2020 Review and syntheses: Turbidity flows – evidence for effects on deep-sea benthic community productivity is ambiguous but the influence on diversity is clearer Katharine T. Bigham, Ashley A. Rowden, Daniel Leduc, and David A.Bowden
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-359,https://doi.org/10.5194/bg-2020-359,2020
Preprint under review for BG (discussion: open, 1 comment) 14 Oct 2020 Does drought advance the onset of autumn leaf senescence in temperate deciduous forest trees? Bertold Mariën, Inge Dox, Hans J. De Boeck, Patrick Willems, Sebastien Leys, Dimitri Papadimitriou, and Matteo Campioli Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-337,https://doi.org/10.5194/bg-2020-337,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
The drivers of the onset of autumn leaf senescence for several deciduous tree species are still unclear. Therefore, we addressed (i) if drought impacts the timing of autumn leaf senescence and (ii) if the relationship between drought and autumn leaf senescence depends on the tree species. Our study suggests that the timing of autumn leaf senescence is conservative across years and species, and even independent of drought stress.Hide
14 Oct 2020 Resistance and resilience of stream metabolism to highflow disturbances
Brynn O'Donnell and Erin R. Hotchkiss Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-304,https://doi.org/10.5194/bg-2020-304,2020
Preprint under review for BG (discussion: open, 2 comments) 13 Oct 2020 Radium-228-derived ocean mixing and trace element inputs in the South Atlantic Yu-Te Hsieh, Walter Geibert, E. Malcolm S. Woodward, Neil J. Wyatt, Maeve C. Lohan, Eric P. Achterberg, and Gideon M. Henderson Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-377,https://doi.org/10.5194/bg-2020-377,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
The South Atlantic near 40 °S is one of the high productivity and most dynamic nutrient regions in the oceans, but the sources and fluxes of trace elements (TEs) to this region remain unclear. This study investigates seawater Ra-228 and provides important constraints on ocean mixing and dissolved TE fluxes to this region. Vertical mixing is a more important source than aeolian or shelf inputs in this region, but particulate or winter deep-mixing inputs may be required to balance the TE budgets.Hide
13 Oct 2020 A two-decades (1988–2009) record of diatom fluxes in the Mauritanian coastal upwelling: Impact of low-frequency forcing and a two-step shift in the species composition Oscar E. Romero, Simon Ramondenc, and Gerhard Fischer Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-336,https://doi.org/10.5194/bg-2020-336,2020
Preprint under review for BG (discussion: open, 2 comments) Shortsummary
Short summary
Upwelling intensity along off NW Africa varies on the interannual to decadal timescale. Understanding its changes is key for the prediction of future changes of CO2 sequestration in the northeastern Atlantic. Based on a multiyear (1988–2009) sediment trap experiment at site 'CBmeso', fluxes and the species composition of the diatom assemblage is presented. Our data helps in establishing the scientific basis for forecasting and modelling future states of this ecosystem and itsdecadal changes.
Hide
12 Oct 2020 Destruction and reinstatement of coastal hypoxia in the South China Sea off the Pearl River Estuary Yangyang Zhao, Khanittha Uthaipan, Zhongming Lu, Yan Li, Jing Liu, Hongbin Liu, Jianping Gan, Feifei Meng, and Minhan Dai Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-346,https://doi.org/10.5194/bg-2020-346,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
We examined the evolution of intermittent hypoxia off the Pearl River Estuary as disturbed by the typhoon. In-situ oxygen consumption rate and associated time scales for the hypoxia formation was estimated for the first time at large-scales over the destruction and reinstatement of hypoxia. The comparable time scales for hypoxia formation, water residence time and disturbances from tropical cyclones have important implications towards better predicting coastal hypoxia in a changingclimate.
Hide
12 Oct 2020 Technical note: Interpreting pH changes Andrea J. Fassbender, James C. Orr, and Andrew G. Dickson Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-348,https://doi.org/10.5194/bg-2020-348,2020
Preprint under review for BG (discussion: final response, 3 comments)Short summary
Short summary
A decline in upper ocean pH with time is typically ascribed to ocean acidification. A more quantitative interpretation is often confused by failing to recognize the implications of pH being a logarithmic transform of hydrogen ion concentration, rather than an absolute measure. This can lead to an unwitting misinterpretation of pH data. We provide three real-world examples illustrating this and recommend the reporting of both hydrogen ion concentration and pH in studies of ocean chemical change.Hide
09 Oct 2020 The Seasonal Phases of an Arctic Lagoon Reveal Non-linearpH Extremes
Cale A. Miller, Christina Bonsell, Nathan D. McTigue, and Amanda L.Kelley
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-358,https://doi.org/10.5194/bg-2020-358,2020
Preprint under review for BG (discussion: open, 3 comments) Shortsummary
Short summary
We report here the first year-long high-frequency pH data set for an Arctic lagoon that captures ice-free and ice-covered seasons. pH and salinity correlation varies by year as we observed positive correlation and independence. Photosynthesis is found to drive high pH values, and small changes in underwater solar radiation can result in rapid decreases in pH. We estimate that arctic lagoons may act as sources of CO2 to the atmosphere, potentially offsetting the arctic ocean's CO2 sink capacity.Hide
08 Oct 2020 Intersecting Methane Production and Oxidation Zones in Freshwater Sediments Xueping Chen, Juan Yu, Lihua Liu, Jing Sun, Fayan Bai, Ming Yang, Zheng Chen, Chiquan He, Xiaoyan Liu, Shuang Bai, and Fushun Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-330,https://doi.org/10.5194/bg-2020-330,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Multiple lines of geochemical, microbiological, and molecular analyses evidenced the crossing zones of methane production and oxidation in the sediments of a freshwater reservoir. Hydrogenotrophic and aceticlastic methanogens were active in the upper and deeper layers, respectively. Two hotspots of AOM were determined there with a higher potential of consumption than the production, sulfate and iron AOM dominated in the subsurface layer and synchronously coupled nitrite-AOM in the middle layer.Hide
07 Oct 2020 The impact of wildfire on biogeochemical fluxes and water quality on boreal catchments Gustaf Granath, Christopher D. Evans, Joachim Strengbom, Jens Fölster, Achim Grelle, Johan Strömqvist, and Stephan J. Köhler Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-363,https://doi.org/10.5194/bg-2020-363,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
We measured element losses and impacts on water quality following a wildfire in Sweden. We observed the largest carbon and nitrogen losses during the fire, and a strong pulse of elements 1–3 months after the fire that showed a fast (weeks) and a slow (months) release from the catchments. Total carbon export through waters did not increase post-fire. Overall, we observed a rapid recovery of the biogeochemical cycling of elements within three years, but still annual net releaseof carbon dioxide.
Hide
07 Oct 2020 Upwelling-induced trace gas dynamics in the Baltic Sea inferred from 8 years of autonomous measurements on a ship ofopportunity
Erik Jacobs, Henry C. Bittig, Ulf Gräwe, Carolyn A. Graves, Michael Glockzin, Jens D. Müller, Bernd Schneider, and Gregor Rehder Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-365,https://doi.org/10.5194/bg-2020-365,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
We use a unique data set of 8 years of continuous carbon dioxide (CO2) and methane (CH4) surface water measurements from a commercial ferry to study upwelling in the Baltic Sea. Its seasonality and regional and interannual variability are examined. Strong upwelling events drastically increase local surface CO2 and CH4 levels and are mostly detected in late summer after long periods of impaired mixing. We introduce an extrapolation method to estimate regional upwelling-induced trace gas fluxes.Hide
06 Oct 2020 Organic carbon in surface sediments of the North Sea andSkagerrak
Markus Diesing, Terje Thorsnes, and Lilja Rún Bjarnadóttir Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-352,https://doi.org/10.5194/bg-2020-352,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
The upper 10 cm of the seafloor of the North Sea and Skagerrak contain 231 million tonnes of carbon in organic form. The Norwegian Trough, the deepest sedimentary basin in the studied area, stands out as a zone of strong organic carbon accumulation with rates on par with neighbouring fjords. Conversely, large parts of the North Sea are characterised by rapid organic carbon degradation and negligible accumulation. This dual character is likely typical for continental shelf sediments worldwide.Hide
06 Oct 2020 Bioturbation has a limited effect on phosphorus burial in salt marsh sediments Sebastiaan J. van de Velde, Rebecca K. James, Ine Callebaut, Silvia Hidalgo-Martinez, and Filip J. R. Meysman Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-340,https://doi.org/10.5194/bg-2020-340,2020
Preprint under review for BG (discussion: open, 0 comments) Shortsummary
Short summary
Some 540 million years ago, animal life evolved in the ocean. Previous research suggested that when these early animals started inhabiting the seafloor, they retained phosphorus in the seafloor, thereby limiting photosynthesis in the ocean. We studied salt-marsh sediments with and without animals and found that their impact on phosphorus retention is limited, which implies that their impact on the global environment might have been less drastic than previouslyassumed.
Hide
02 Oct 2020 Alkenone isotopes show evidence of active carbon concentrating mechanisms in coccolithophores as aqueous carbon dioxide concentrations fall below 7 μmol L−1Marcus P. S. Badger
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-356,https://doi.org/10.5194/bg-2020-356,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
Reconstructing ancient atmospheric CO2 is an important aim of palaeoclimate science in order to understand the Earth's climate system. One method, the alkenone proxy based on molecular fossils of coccolithophores, has been recently shown to be ineffective at low to moderate CO2 levels. In this paper I show that this is likely due to changes in the biogeochemistry of the coccolithophores when there is low carbon availability, but for much of the Cenozoic the alkenone proxy should have utility.Hide
30 Sep 2020 Carbon Export and Fate Beneath a Dynamic Upwelled Filament off the California Coast Hannah L. Bourne, James K. B. Bishop, Elizabeth J. Connors, and ToddJ. Wood
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-342,https://doi.org/10.5194/bg-2020-342,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
To learn how the biological carbon pump works in productive coastal upwelling systems, four autonomous Carbon Flux Explorers measured carbon flux through the twilight zone beneath an offshore-flowing filament of biologically productive water. Strikingly different particle classes dominated the carbon fluxes during successive stages of the filament evolution over 30 days. Both flux and transfer efficiency were far greater than expected suggesting an out-sized filament impact in California waters.Hide
29 Sep 2020 Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean Michelle N. Simone, Kai G. Schulz, Joanne M. Oakes, and Bradley D.Eyre
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-335,https://doi.org/10.5194/bg-2020-335,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Estuaries are responsible for a large contribution of dissolved organic carbon (DOC) to the global C-cycle, but it is unknown how this will change in the future. DOC fluxes from unvegetated sediments were investigated ex situ subject to conditions of warming and ocean acidification (OA). The future climate shifted sediment fluxes from a slight DOC source to a significant sink, with global coastal DOC export decreasing by 80 %. This has global implications for C-cycling and long-term C-storage.Hide
28 Sep 2020 Factors controlling the productivity of tropical Andean forests: Climate and soil are more important than tree diversity Jürgen Homeier and Christoph Leuschner Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-332,https://doi.org/10.5194/bg-2020-332,2020
Preprint under review for BG (discussion: open, 1 comment) 28 Sep 2020 Nordic Seas Acidification Filippa Fransner, Friederike Fröb, Jerry Tjiputra, Melissa Chierici, Agneta Fransson, Emil Jeansson, Truls Johannessen, Elizabeth Jones, Siv K. Lauvset, Sólveig R. Ólafsdóttir, Abdirahman Omar, Ingunn Skjelvan, and Are Olsen Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-339,https://doi.org/10.5194/bg-2020-339,2020
Preprint under review for BG (discussion: final response, 3 comments)Short summary
Short summary
Ocean acidification, a direct consequence of the CO2 release by human activities, is a serious threat to marine ecosystems. In this study we make a detailed investigation of the acidification of the Nordic Seas, from 1850 to 2100, by using a large set of samples taken during research cruises together with numerical model simulations. We estimate the effects of changes in different environmental factors on the rate of acidification, and its potential effects on cold-watercorals.
Hide
23 Sep 2020 Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project) Stéphanie H. M. Jacquet, Christian Tamburini, Marc Garel, Aurélie Dufour, France Van-Vambeke, Frédéric A. C. Le Moigne, Nagib Bhairy,and Sophie Guasco
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-271,https://doi.org/10.5194/bg-2020-271,2020
Preprint under review for BG (discussion: final response, 2 comments) 23 Sep 2020 Evaluating stream CO2 outgassing via Drifting and Anchored flux chambers in a controlled flume experiment Filippo Vingiani, Nicola Durighetto, Marcus Klaus, Jakob Schelker, Thierry Labasque, and Gianluca Botter Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-327,https://doi.org/10.5194/bg-2020-327,2020
Preprint under review for BG (discussion: final response, 4 comments) 21 Sep 2020 Winter atmospheric nutrients and pollutants deposition on West Sayan mountain lakes (Siberia) Daniel Diaz-de-Quijano, Aleksander Vladimirovich Ageev, Elena Anatolevna Ivanova, and Olesia Valerevna Anishchenko Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-125,https://doi.org/10.5194/bg-2020-125,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Winter atmospheric nitrogen and phosphorus depositions were measured for the first time in the West Sayan mountains (Siberia). The low and very low atmospheric N and P depositions could be responsible for the observed lake phytoplankton N-P colimitation. We hypothesize that slight imbalances in the nutrient deposition, as expected in the context of global change (climate, forest fire regime, and anthropogenic nitrogen emissions), could have important effects on the ecology of these lakes.Hide
21 Sep 2020 Technical Note: Inexpensive modification of Exetainers for the reliable storage of trace-level hydrogen and carbon monoxidegas samples
Philipp A. Nauer, Eleonora Chiri, Thanavit Jirapanjawat, Chris Greening, and Perran L. M. Cook Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-282,https://doi.org/10.5194/bg-2020-282,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Hydrogen (H2) and carbon monoxide (CO) are atmospheric trace gases cycled via microbial metabolisms. We observed strong H2 and CO contamination from rubber septa used to seal common gas-sample storage vials. Here we propose a simple and inexpensive modification of such vials to allow reliable storage of H2, CO and methane trace-gas samples for timescales of weeks to months, thus enabling extensive field campaigns to investigate H2 and CO biogeochemistry in remoteareas.
Hide
21 Sep 2020 Impact of bottom trawling on sediment biogeochemistry: amodelling approach
Emil De Borger, Justin Tiano, Ulrike Braeckman, Adriaan D. Rijnsdorp, and Karline Soetaert Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-328,https://doi.org/10.5194/bg-2020-328,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
Bottom trawling alters benthic mineralization: the recycling of organic material (OM) to free nutrients. To better understand how this occurs, trawling events were added to a model of seafloor OM recycling. Results show that bottom trawling reduces OM and free nutrients in sediments through direct removal thereof, and of fauna which transport OM to deeper sediment layers protected from fishing. Our results support temporospatial trawl-restrictions to allow key sediment functions to recover.Hide
17 Sep 2020 Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica Melisa A. Diaz, Christopher B. Gardner, Susan A. Welch, W. Andrew Jackson, Byron J. Adams, Diana H. Wall, Ian D. Hogg, Noah Fierer, andW. Berry Lyons
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-316,https://doi.org/10.5194/bg-2020-316,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
Water-soluble salt and nutrient concentrations of soils collected along the Shackleton Glacier, Antarctica show distinct geochemical gradients related to latitude, longitude, elevation, soil moisture, and distance from coast and glacier. Machine learning algorithms were used to estimate geochemical gradients for the region given the relationship with geography. Geography and surface exposure age drive salt and nutrient abundances, influencing invertebrate habitat suitability and biogeography.Hide
14 Sep 2020 Fast local warming of sea-surface is the main factor of recent deoxygenation in the Arabian Sea Zouhair Lachkar, Michael Mehari, Muchamad Al Azhar, Marina Lévy, andShafer Smith
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-325,https://doi.org/10.5194/bg-2020-325,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
This study documents and quantifies a significant recent oxygen decline in the upper layers of the Arabian Sea and explores its drivers. Using a modeling approach we show that the fast local warming of sea surface is the main factor causing this oxygen drop. Concomitant summer monsoon intensification contributes to this trend, although to a lesser extent. These changes exacerbate oxygen depletion in the subsurface, threatening marine habitats and altering the localbiogeochemistry.
Hide
14 Sep 2020 The effect of organic matter (OM) quality on the redox stability of OM-Fe association in freshwater sediments Nana O.-A. Osafo, Jiří Jan, Petr Porcal, Daniel A. Petrash, andJakub Borovec
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-296,https://doi.org/10.5194/bg-2020-296,2020
Revised manuscript under review for BG (discussion: final response, 6 comments) Short summaryShort summary
We investigated the role that OM quality plays in the stability of the OM-Fe association in freshwater sediments. It was found that non-humic components enhance OM-Fe stability, while humic components enhance the reductive dissolution of OM-Fe. This information is useful for predicting the fate of OM-Fe in freshwater systems with discrete sources of OM. Stable OM-Fe complexes improve aqueous environments by reducing the release of greenhouse gases, heavy metals and excess nutrients, such as P.Hide
14 Sep 2020 Sources and processes sustaining surface CO2 and CH4 fluxes in a tropical reservoir: the importance of water columnmetabolism
Cynthia Soued and Yves T. Prairie Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-258,https://doi.org/10.5194/bg-2020-258,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
Freshwater reservoirs emit greenhouse gases (CO2 and CH4) to the atmosphere, however, the sources underlying these emissions are numerous and their magnitude is not well known. This study quantifies surface CO2 and CH4 emissions and all their potential sources in a tropical reservoir. Findings show that emissions are mostly influenced by internal metabolic processes rather than external inputs. However, results highlight the challenges and uncertainties related to estimating internal metabolism.Hide
11 Sep 2020 Carbon sources of benthic fauna in temperate lakes across multiple trophic states Annika Fiskal, Eva Anthamatten, Longhui Deng, Xingguo Han, Lorenzo Lagostina, Anja Michel, Rong Zhu, Nathalie Dubois, Carsten J. Schubert, Stefano M. Bernasconi, and Mark A. Lever Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-318,https://doi.org/10.5194/bg-2020-318,2020
Preprint under review for BG (discussion: open, 1 comment) 11 Sep 2020 Extraterrestrial dust as a source of bioavailable Fe for the ocean productivity Rudraswami N. Gowda, Mayank Pandey, Matthew J. Genge, and DafilgoFernandes
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-283,https://doi.org/10.5194/bg-2020-283,2020
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
Bioavailable Fe is necessary component for phytoplankton to survive and will play a crucial role in reducing the carbon dioxide in the atmosphere. The Fe increase the primary productivity of ocean which is rare in the isolated region of the ocean. Here, the role of extraterrestrial dust become significant as smoke from the ablation and etching also contribute Fe to this organism which in turn reduces the adverse effect on the climate by acting as sink of carbon dioxide.Hide
10 Sep 2020 Metagenomic insights into the metabolism of microbial communities that mediate iron and methane cycling in Lake Kinneretsediments
Michal Elul, Maxim Rubin-Blum, Zeev Ronen, Itay Bar-Or, Werner Eckert,and Orit Sivan
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-329,https://doi.org/10.5194/bg-2020-329,2020
Preprint under review for BG (discussion: final response, 8 comments) 10 Sep 2020 Topography-based modelling reveals high spatial variability and seasonal emission patches in forest floor methane flux Elisa Vainio, Olli Peltola, Ville Kasurinen, Antti-Jussi Kieloaho, Eeva-Stiina Tuittila, and Mari Pihlatie Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-263,https://doi.org/10.5194/bg-2020-263,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
We studied forest floor methane exchange over an area of ten hectares in a boreal pine forest. The results demonstrate high spatial variability in soil moisture and consequently in the methane flux. We detected wet patches emitting high amounts of methane in the early summer, however, these patches turned to methane uptake in the autumn. We concluded that the small-scale spatial variability of the boreal forest methane flux highlights the importance of soil chamber placement in similar studies.Hide
09 Sep 2020 Multi-scale assessment of a grassland productivity model Shawn D. Taylor and Dawn M. Browning Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-321,https://doi.org/10.5194/bg-2020-321,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Grasslands in North America provide multiple ecosystem services and drive production for the majority of grain, beef, and other staples. We evaluated a grassland productivity model using nearly 500 years of grassland camera data and found the areas where the model worked well, and locations where it did not. Long-term grassland forecasts for the suitable locations can be made immediately with the current model, while other areas, such as the Southwest, will need further modeldevelopment.
Hide
09 Sep 2020 Nitrate assimilation and regeneration in the Barents Sea: insights from nitrogen isotopes Robyn E. Tuerena, Joanne Hopkins, Raja S. Ganeshram, Louisa Norman, Camille de la Vega, Rachel Jeffreys, and Claire Mahaffey Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-293,https://doi.org/10.5194/bg-2020-293,2020
Revised manuscript under review for BG (discussion: final response, 7 comments) Short summaryShort summary
The Barents Sea is a rapidly changing, shallow sea within the Arctic. Here, we found that over the growing season, nitrate, an essential nutrient, is fully consumed and likely to be the main limiting nutrient to algae. We found no evidence for nitrogen loss in the Barents Sea sediments, which may be because this region is dominated by energetic ocean currents. We suggest that future nutrient availability in the Barents Sea will depend on the source waters supplied from the Atlantic.Hide
08 Sep 2020 Unravelling the physical and physiological basis for the solar-induced chlorophyll fluorescence and photosynthesis relationship Peiqi Yang, Christiaan Van der Tol, Petya K. E. Campbell, and Elizabeth M. Middleton Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-323,https://doi.org/10.5194/bg-2020-323,2020
Revised manuscript under review for BG (discussion: final response, 7 comments) Short summaryShort summary
Solar-induced chlorophyll fluorescence (SIF) has the potential to facilitate the monitoring of photosynthesis from space. This study presents a systematic analysis of the physical and physiological meaning of the relationship between fluorescence and photosynthesis at both leaf and canopy levels. We unravel the individual effects of incoming light, vegetation structure and leaf physiology and highlights their joint effects on the relationship between canopy fluorescence and photosynthesis.Hide
07 Sep 2020 On the barium-oxygen consumption relationship in the Mediterranean Sea: implications for mesopelagic marine snowremineralisation
Stéphanie H. M. Jacquet, Dominique Lefèvre, Christian Tamburini, Marc Garel, Frédéric A. C. Le Moigne, Nagib Bhairy, Marie Roumagnac,and Sophie Guasco
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-241,https://doi.org/10.5194/bg-2020-241,2020
Preprint under review for BG (discussion: final response, 2 comments) 04 Sep 2020 Modelling Silicate – Nitrate - Ammonium co-limitation of algal growth and the importance of bacterial remineralisation based on an experimental Arctic coastal spring bloom culture study Tobias R. Vonnahme, Martial Leroy, Silke Thoms, Dick van Oevelen, H. Rodger Harvey, Svein Kristiansen, Rolf Gradinger, Ulrike Dietrich, andChristoph Voelker
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-314,https://doi.org/10.5194/bg-2020-314,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Diatoms are crucial for Arctic coastal spring blooms and their growth iscontrolled by nutrients and light. At the end of the bloom inorganic nitrogen or silicon can limit be limiting, but nitrogen can be regenerated by bacteria, extending the growth phase. Modelling these multi-nutrient dynamics and the role of bacteria is challenging, yet crucial for accurate modelling. We recreated spring bloom dynamics in a cultivation experiment and developed a representative dynamic model.Hide
04 Sep 2020 Plant phenology evaluation of CRESCENDO land surface models – Part I: start and end of growing season Daniele Peano, Deborah Hemming, Stefano Materia, Christine Delire, Yuanchao Fan, Emilie Joetzjer, Hanna Lee, Julia E. M. S. Nabel, Taejin Park, Philippe Peylin, David Wårlind, Andy Wiltshire, and SönkeZaehle
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-319,https://doi.org/10.5194/bg-2020-319,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Global climate models are the scientist's tools used in studying past, present, and future climate conditions. This work examines the ability of a group of our tools in reproducing and capturing the right timing and length of the season when plants show their green leaves. This season, indeed, is fundamental for CO2 exchanges between land and atmosphere, and climate. This work shows that discrepancies compared to observations remain demanding further polishing of these tools.Hide
03 Sep 2020 The rising productivity of alpine grassland under warming, drought and N-deposition treatments Matthias Volk, Matthias Suter, Anne-Lena Wahl, and Seraina Bassin Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-322,https://doi.org/10.5194/bg-2020-322,2020
Preprint under review for BG (discussion: final response, 8 comments)Short summary
Short summary
In a multi-year field study alpine grassland growth increased with 1.3 °C warming. Even at the maximum warming of 2.4 °C the yield was larger than at the reference site. At the same time −1.7 °C cooling did not reduce growth. Thus, alpine grassland growth has likely not increased during the past century, but, despite growing soil moisture deficits, will do so with continued warming in the near future. Ecosystem services (eg. fodder production, erosion control) will benefit from moderate warming.Hide
02 Sep 2020 Technical note: CO2 is not like CH4 – limits of and corrections to the headspace method to analyse _p_CO2 in water Matthias Koschorreck, Yves T. Prairie, Jihyeon Kim, and Rafael Marcé Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-307,https://doi.org/10.5194/bg-2020-307,2020
Preprint under review for BG (discussion: final response, 7 comments)Short summary
Short summary
The concentration of carbon dioxide (CO2) in water samples is often measured using a gas chromatograph. Depending on the chemical composition of the water this method can produce wrong results. We quantified the possible error and how it depends on water composition and the analytical procedure. We propose a method to correct wrong results by additionally analysing alkalinity in the samples. We provide an easily usable computer code to perform the correctioncalculations.
Hide
02 Sep 2020 Microbial diversity-informed modelling of polar marineecosystem functions
Hyewon Heather Kim, Jeff S. Bowman, Ya-Wei Luo, Hugh W. Ducklow, Oscar M. Schofield, Deborah K. Steinberg, and Scott C. Doney Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-302,https://doi.org/10.5194/bg-2020-302,2020
Preprint under review for BG (discussion: final response, 2 comments) 02 Sep 2020 Dynamics of the Deep Chlorophyll Maximum in the Black Sea as depicted by BGC-Argo floats Florian Ricour, Arthur Capet, Fabrizio D'Ortenzio, Bruno Delille, andMarilaure Grégoire
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-295,https://doi.org/10.5194/bg-2020-295,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
This paper addresses the phenology of the Deep Chlorophyll Maximum (DCM) in the Black Sea (BS). Our results show that the DCM is initiated in March at a density level corresponding to the depth of the maximum mixing of the water column in winter. It remains attached to this layer until the end of September before it starts to be eroded in October. The DCM seems to be a self-sustaining structure rather than being shaped by external factors and is important for further ecosystem studies in the BS.Hide
01 Sep 2020 Comparing modified substrate induced respiration with selective inhibition (SIRIN) and N2O isotope approaches to estimate fungal contribution to denitrification in three arable soils underanoxic conditions
Lena Rohe, Traute-Heidi Anderson, Heinz Flessa, Anette Giesemann, Dominika Lewicka-Szczebak, Nicole Wrage-Mönnig, and Reinhard Well Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-285,https://doi.org/10.5194/bg-2020-285,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
This is the first experimental setup combining a complex set of methods (microbial inhibitors and isotopic approaches) to differentiate between N2O produced by fungi or bacteria during denitrification in three soils. Inhibitors confirmed the expected effect on N2O production only in one out of four experiments, but coincided with isotopic approaches in showing dominance of bacterial denitrification. We present a discussion on artefacts occurring with microbial inhibition to determine N2O fluxes.Hide
31 Aug 2020 Rapid abiotic transformation of marine dissolved organic material to particulate organic material in surface and deep waters Paola Valdes Villaverde, Cesar Almeda Jauregui, and Helmut Maske Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-291,https://doi.org/10.5194/bg-2020-291,2020
Revised manuscript under review for BG (discussion: final response, 6 comments) Short summaryShort summary
The oceans sequester more than 1/4 of the anthropogenic CO2, mainly through the sinking of organic particles (POM) to the seafloor. POM samples are collected on filter; the filtrate is expected to contain only dissolved organic material, but we found unexpectedly high POM when the filtrate was refiltered. We interpret this POM as gels that were formed in the filtrate by hydraulic stress during the filtration. In deep water samples the POM collected can be less than the POM inthe filtrate.
Hide
27 Aug 2020 Estimating immediate post-fire carbon fluxes using the eddy-covariance technique Bruna R. F. Oliveira, Carsten Schaller, J. Jacob Keizer, and ThomasFoken
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-312,https://doi.org/10.5194/bg-2020-312,2020
Preprint under review for BG (discussion: final response, 5 comments)Short summary
Short summary
Forest fires have a significant impact on carbon dioxide emissions. The present study from pine forest in Portugal is one of the few where measurements of CO2 fluxes were started immediately (one and a half months) after the forest fire. Carbon dioxide emissions were linked to soil humidiy. Therefore, they started after the beginning of the rainfall in autumn. Due to the beginning of vegetation, the site was already a carbon dioxide sink the following year.Hide
27 Aug 2020 Enhancement of the North Atlantic CO2 sink by ArcticWaters
Jon Olafsson, Solveig R. Olafsdottir, Taro Takahashi, Magnus Danielsen, and Thorarinn S. Arnarson Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-313,https://doi.org/10.5194/bg-2020-313,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
The Atlantic north of 50° N is an intense ocean sink area for atmospheric CO2. Observations in the vicinity of Iceland reveal a previously unrecognized Arctic contribution to the North Atlantic CO2 sink. Sustained CO2 influx to waters flowing from the Arctic Ocean is linked to their excess alkalinity derived from sources in the changing Arctic. The results relate to the question: Will the North Atlantic continue to absorb CO2 in the future as it has in the past?Hide
27 Aug 2020 Comparison of greenhouse gas fluxes and microbial communities from tropical forest and adjacent oil palm plantations onmineral soil
Julia Drewer, Melissa M. Leduning, Robert I. Griffiths, Tim Goodall, Peter E. Levy, Nicholas Cowan, Edward Comynn-Platt, Garry Hayman, Justin Sentian, Noreen Majalap, and Ute M. Skiba Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-297,https://doi.org/10.5194/bg-2020-297,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
In Southeast Asia, oil palm plantations have largely replaced tropical forests. The impact of this shift in land-use on greenhouse gas fluxes and soil microbial communities remains uncertain. We have found emission rates of the potent greenhouse gas nitrous oxide on mineral soil to be higher from oil palm plantations than logged forest over a 2-year study and concluded that emissions have increased over the last 42 years in Sabah, with the proportion of emissions from plantations increasing.Hide
27 Aug 2020 A Limited Effect of Sub-Tropical Typhoons on Phytoplankton Dynamics Fei Chai, Yuntao Wang, Xiaogang Xing, Yunwei Yan, Huijie Xue, Mark Wells, and Emmanuel Boss Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-310,https://doi.org/10.5194/bg-2020-310,2020
Preprint under review for BG (discussion: final response, 9 comments)Short summary
Short summary
The unique observations by a biogeochemical-Argo float in Northwest Pacific Ocean captured the impact of a super typhoon on upper ocean physical and biological processes. Our result reveals typhoon can increase the surface chlorophyll through strong vertical mixing without bringing nutrients upward from the depth. The vertical re-distribution of chlorophyll contributes little to enhance the primary production which is contradictory to many of former satellite-based studies related to this topic.Hide
26 Aug 2020 A bottom-up quantification of foliar mercury uptake fluxes across Europe Lena Wohlgemuth, Stefan Osterwalder, Carl Joseph, Ansgar Kahmen, Günter Hoch, Christine Alewell, and Martin Jiskra Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-289,https://doi.org/10.5194/bg-2020-289,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Mercury (Hg) uptake by trees from the air is an important mechanism for the distribution of Hg in the environment. However, on the scale of a whole forest the amount of net Hg uptake is rarely measured which motivated us to our study. We determined Hg uptake fluxes by leaves and needles at 10 European forests and found that these Hg uptake fluxes are indeed large relative to other fluxes. The amount of Hg uptake by leaves and needles depended on their age and growing heighton the tree.
Hide
26 Aug 2020 Impacts of fertilization on grassland productivity and water quality across the European Alps: insights from a mechanisticmodel
Martina Botter, Matthias Zeeman, Paolo Burlando, and Simone Fatichi Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-294,https://doi.org/10.5194/bg-2020-294,2020
Preprint under review for BG (discussion: final response, 4 comments) 26 Aug 2020 Millennial-age GDGTs in forested mineral soils: 14C-based evidence for stabilization of microbial necromass Hannah Gies, Frank Hagedorn, Maarten Lupker, Daniel Montluçon, Negar Haghipour, Tessa Sophia van der Voort, and Timothy Ian Eglinton Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-308,https://doi.org/10.5194/bg-2020-308,2020
Revised manuscript accepted for BG (discussion: final response, 4 comments) Short summaryShort summary
Understanding controls on the persistence of organic matter in soils is essential to constrain its role in the carbon cycle. Emerging concepts suggest that the soil carbon pool is predominantly comprised of stabilized microbial residues. To test this hypothesis we isolated microbial membrane lipids from two Swiss soil profiles and measured their radiocarbon age. We find that the ages of these compounds are in the range of millenia and thus provide evidence for stabilized microbial mass in soils.Hide
25 Aug 2020 The effect of salinity, light regime and food source on C and N uptake in a kleptoplast-bearing foraminifera Michael Lintner, Bianca Lintner, Wolfgang Wanek, Nina Keul, and PetraHeinz
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-306,https://doi.org/10.5194/bg-2020-306,2020
Revised manuscript under review for BG (discussion: final response, 6comments)
24 Aug 2020 Physiological responses of _Skeletonema_ _costatum_ to the interactions of seawater acidification and combination of photoperiod and temperature Hangxiao Li, Tianpeng Xu, Jing Ma, Futian Li, and Juntian Xu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-303,https://doi.org/10.5194/bg-2020-303,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Few studies investigated interactions of ocean acidification and seasonal changes in temperature and daylength on marine diatoms. We cultured a marine diatom under two CO2 levels and three combinations of temperature and daylength, simulating different seasons, to investigate combined effects of these factors. Results showed acidification had contrasting effects under different combinations, indicating that future ocean may show differential effects on diatoms in different cluster of factors.Hide
24 Aug 2020 Impact of dust enrichment on Mediterranean plankton communities under present and future conditions of pH and temperature: an experimental overview Frédéric Gazeau, Céline Ridame, France Van Wambeke, Samir Alliouane, Christian Stolpe, Jean-Olivier Irisson, Sophie Marro, Jean-Michel Grisoni, Guillaume De Liège, Sandra Nunige, Kahina Djaoudi, Elvira Pulido-Villena, Julie Dinasquet, Ingrid Obernosterer, Philippe Catala, and Cécile Guieu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-202,https://doi.org/10.5194/bg-2020-202,2020
Preprint under review for BG (discussion: open, 1 comment) 21 Aug 2020 Improving the monitoring of deciduous broadleaf phenology using the Geostationary Operational Environmental Satellite (GOES) 16and 17
Kathryn I. Wheeler and Michael C. Dietze Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-309,https://doi.org/10.5194/bg-2020-309,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Monitoring leaf phenology (i.e., seasonality) allows for tracking the progression of climate change and seasonal variations in a variety of organismal and ecosystem processes. Recent versions of the Geostationary Operational Environmental Satellites allow for the monitoring of a phenological-sensitive index at a high temporal frequency (5–10 minutes) throughout most of the western hemisphere. Here we show the high potential of this new data to measure the phenology of deciduous forests.Hide
20 Aug 2020 Examining the sensitivity of the terrestrial carbon cycle to the expression of El Niño Lina Teckentrup, Martin G. De Kauwe, Andrew J. Pitman, and BenjaminSmith
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-299,https://doi.org/10.5194/bg-2020-299,2020
Preprint under review for BG (discussion: final response, 5 comments)Short summary
Short summary
The El Niño‐Southern Oscillation (ENSO) describes changes in the sea surface temperature patterns of the Pacific Ocean. This influences the global weather, impacting vegetation on land. There are two types of El Niño: Central–Pacific (CP) and Eastern–Pacific (EP). In this study, we explored the long-term impacts on the carbon balance on land linked to the two El Niño types. Using a dynamic vegetation model, we simulated what would happen if only either CP or EP El Niño events had occurred.Hide
19 Aug 2020 Effects of land use and water quality on greenhouse gas emissions from an urban river system Long Ho, Ruben Jerves-Cobo, Matti Barthel, Johan Six, Samuel Bode, Pascal Boeckx, and Peter Goethals Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-311,https://doi.org/10.5194/bg-2020-311,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Rivers are being polluted by human activities, especially in urban areas. We studied the greenhouse gas (GHG) emissions from an urban river system. The results showed a clear trend between water quality and GHG emissions in which the more polluted the sites were, the higher were their emissions. When river water quality worsened, its contribution to global warming can go up by 10 times. Urban rivers emitted 4-times more than of the amount of GHGs compared to rivers innatural sites.
Hide
18 Aug 2020 Cross-basin differences in the nutrient assimilation characteristics of induced phytoplankton blooms in the subtropicalPacific waters
Fuminori Hashihama, Hiroaki Saito, Taketoshi Kodama, Saori Yasui-Tamura, Jota Kanda, Iwao Tanita, Hiroshi Ogawa, E. Malcolm S. Woodward, Philip W. Boyd, and Ken Furuya Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-300,https://doi.org/10.5194/bg-2020-300,2020
Revised manuscript under review for BG (discussion: final response, 6 comments) Short summaryShort summary
We investigated the nutrient assimilation characteristics of deep-water induced phytoplankton blooms across the subtropical North and South Pacific Ocean. Nutrient drawdown ratios of dissolved inorganic nitrogen to phosphate were anomalously low in the western North Pacific, likely due to the high phosphate uptake capability of low phosphate-adapted phytoplankton. The anomalous phosphate uptake might influence the maintenance of chronic phosphate depletion in the western North Pacific.Hide
17 Aug 2020 Spatial patterns of biphasic ectoenzymatic kinetics related to biogeochemical properties in the Mediterranean Sea France Van Wambeke, Elvira Pulido, Julie Dinasquet, Kahina Djaoudi, Anja Engel, Marc Garel, Sophie Guasco, Sandra Nunige, Vincent Taillandier, Birthe Zäncker, and Christian Tamburini Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-253,https://doi.org/10.5194/bg-2020-253,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
The Michaelis-Menten kinetics of low and high affinity systems were determined for alkaline phosphatase, aminopeptidase and β-glucosidase in the Mediterranean Sea. Although ectoenzymatic hydrolysis contribution to heterotrophic prokaryotic needs was high in terms of N, it was low in terms of C. This study points out the biases in interpretation of the relative differences of activities among the 3 tested enzymes, in regard to the choice of added concentrations of fluorogenic substrates.Hide
14 Aug 2020 Water Flow Controls the Spatial Variability of Methane Emissions in a Northern Valley Fen Ecosystem Hui Zhang, Eeva-Stiina Tuittila, Aino Korrensalo, Aleksi Räsänen, Tarmo Virtanen, Mika Aurela, Timo Penttilä, Tuomas Laurila, Stephanie Gerin, Viivi Lindholm, and Annalea Lohila Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-268,https://doi.org/10.5194/bg-2020-268,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
We studied the impact of a stream on peatland microhabitats and CH4 emissions in a northern boreal fen. We found that close to the stream there were higher water levels, lower peat temperatures, and greater oxygen concentrations; these supported the highest biomass production but resulted in the lowest CH4 emissions. Further from the stream, the conditions were drier and CH4 emissions were also low. CH4 emissions were highest in the intermediate distance from the stream.Hide
14 Aug 2020 What determines the sign of the evapotranspiration response to afforestation in the European summer? Marcus Breil, Edouard L. Davin, and Diana Rechid Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-275,https://doi.org/10.5194/bg-2020-275,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
The physical processes behind varying evapotranspiration rates of forests and grasslands in Europe are investigated in a regional model study with idealized afforestation scenarios. The results show that the evapotranspiration response to afforestation depends on the interplay of two counteracting factors; the transpiration facilitating characteristics of a forest and the reduced saturation deficits of forests caused by an increased surface roughness and associated lower surface temperatures.Hide
13 Aug 2020 Importance of succession in estimating biomass loss: Combining remote sensing and individual-based forest models Ulrike Hiltner, Andreas Huth, and Rico Fischer Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-264,https://doi.org/10.5194/bg-2020-264,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
The aim of our study is to to analyze the consequences of elevated tree mortality on tropical forest dynamics and to provide a methodology that can reduce uncertainties in estimating biomass loss due to tree mortality at local and country levels.Hide
12 Aug 2020 Sun-induced Fluorescence and Near Infrared Reflectance of vegetation track the seasonal dynamics of gross primary productionover Africa
Anteneh Getachew Mengistu, Gizaw Mengistu Tsidu, Gerbrand Koren, Maurits L. Kooreman, K. Folkert Boersma, Torbern Tagesson, Jonas Ardö, Yann Nouvellon, and Wouter Peters Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-242,https://doi.org/10.5194/bg-2020-242,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
In this study, we assess the usefulness of Sun-Induced Fluorescence of Terrestrial Ecosystems Retrieval (SIF) data from the GOME-2A instrument and Near Infra-red reflectance of vegetation (NIRv) from MODIS to capture the seasonality and magnitudes of Gross Primary Production (GPP) derived from six eddy covariance flux towers from Africa in the overlap years between 2007–2014. We also test the robustness of SIF and NIRv to track the seasonality of GPP for the major biomes in comparison to others.Hide
12 Aug 2020 Oxygen budget for the north-western Mediterranean deepconvection region
Caroline Ulses, Claude Estournel, Marine Fourrier, Laurent Coppola, Fayçal Kessouri, Dominique Lefèvre, and Patrick Marsaleix Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-277,https://doi.org/10.5194/bg-2020-277,2020
Revised manuscript under review for BG (discussion: final response, 7 comments) Short summaryShort summary
We analyze the seasonal cycle of O2 and estimate an annual O2 budget in the north-western Mediterranean deep convection region, using a numerical model. We show that this region acts as a large sink of atmospheric O2 and as a major source of O2 for the western Mediterranean Sea. The decrease in the deep convection intensity predicted in recent projections may have important consequences on the overall uptake of O2 in the Mediterranean Sea and on the O2 exchanges with the Atlantic Ocean.Hide
12 Aug 2020 Estimating maximum mineral associated organic carbon inUK grasslands
Kirsty C. Paterson, Joanna M. Cloy, Robert M. Rees, Elizabeth M. Baggs, Hugh Martineau, Dario Fornara, Andrew J. Macdonald, and SarahBuckingham
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-273,https://doi.org/10.5194/bg-2020-273,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Soil organic carbon sequestration across agroecosystems worldwide can contribute to mitigate the effects of climate change by reducing levels of atmospheric carbon dioxide. Maximum carbon sequestration potential is frequently estimated using the linear regression equation developed by Hassink (1997). This work examines the suitability of this equation for use in grasslands across the United Kingdom. The results highlight the need to ensure the fit of equations to the soilsbeing studied.
Hide
11 Aug 2020 Soil properties override climate controls on global soil organic carbon stocks Zhongkui Luo and Raphael Viscarra-Rossel Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-298,https://doi.org/10.5194/bg-2020-298,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
We disentangled the relative importance of biotic, climatic and edaphic variables in controlling global SOC stocks. The results suggested that soil physiochemical properties are more important than climatic variables for controlling global SOC stocks, challenging current climate-driven framework of SOC dynamics.Hide
10 Aug 2020 Factors controlling _Carex brevicuspis_ leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels Lianlian Zhu, Zhengmiao Deng, Yonghong Xie, Xu Li, Feng Li, Xinsheng Chen, Yeai Zou, Chengyi Zhang, and Wei Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-266,https://doi.org/10.5194/bg-2020-266,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
We compared the relative _Carex brevicuspis_ litter decomposition rates in wetland surface soil at different water levels. The results showed that higher wetland water levels facilitate the release of organic carbon from leaf litter into the soil via water leaching. In this way, the wetland soil carbon pool is strengthened. At lower water levels, wetland soil carbon is lost as the litter decomposition is lower, but active microbial (actinomycete) respiration rate is higherthere.
Hide
10 Aug 2020 The transformation of the forest steppe in the lower Danube Plain of south-eastern Europe: 6000 years of vegetation andland use dynamic
Angelica Feurdean, Roxana Grindean, Gabriela Florescu, Ioan Tanţău, Eva Niedermeyer, Andrei-Cosmin Diaconu, Simon M. Hutchinson, Anne Brigitte Nielsen, Tiberiu Sava, Andrei Panait, Mihaly Braun, andThomas Hickler
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-239,https://doi.org/10.5194/bg-2020-239,2020
Revised manuscript accepted for BG (discussion: final response, 5 comments) Short summaryShort summary
Here we used multi-proxy analyses from Lake Oltina (Romania), and examine for the first time, the past 6000 years history of the forest steppe in the Lower Danube Plain, one of the oldest areas of human occupation in SE Europe. We found the greatest tree cover between 6000 and 2500 cal yr BP. Forest loss was under way by 2500 yr BP falling to ~ 20 % tree cover linked to clearance for agriculture. The weak signs of forest recovery over the past 2500 years highlights recurring anthropogenic pressure.Hide
10 Aug 2020 Characterizing the origin of excess dissolved organic carbon in coastal seawater using stable carbon isotope and light absorption characteristics Heejun Han, Jeomshik Hwang, and Guebuem Kim Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-272,https://doi.org/10.5194/bg-2020-272,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
The main source of excess DOC occurring in coastal seawater off an artificial lake, which is semi-enclosed by a dyke, was determined using combination of various biogeochemical tools including DOC and nutrient concentrations, stable carbon isotope, and optical properties of colored dissolved organic matter (CDOM) in two different seasons (March 2017 and September 2018).Hide
07 Aug 2020 Human-induced influence on eggs and larval fish transport in a subtropical estuary Maria Helena P. António, José H. Muelbert, and Elisa H. L. Fernandes Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-281,https://doi.org/10.5194/bg-2020-281,2020
Preprint under review for BG (discussion: final response, 5 comments)Short summary
Short summary
The Barra Jetties at the mouth of the Lagoa dos Patos estuary were recently changed. The hydrodynamic model TELEMAC-3D coupled to passive particles was used to simulate the transport of eggs and larvae of croaker, in controlled simulations. Hydrodynamic changes occurred reflected on the transport of eggs and larvae, with a reduction in the abundance and extension of the incursion into the estuary in the new jetties configuration. The results can help the management and circumvent of fish stocks.Hide
06 Aug 2020 Combined effects of ozone and drought stress on the emission of biogenic volatile organic compounds from _Quercus robur_L.
Arianna Peron, Lisa Kaser, Anne Charlott Fitzky, Martin Graus, Heidi Halbwirth, Jürgen Greiner, Georg Wohlfahrt, Boris Rewald, Hans Sandén, and Thomas Karl Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-260,https://doi.org/10.5194/bg-2020-260,2020
Revised manuscript accepted for BG (discussion: final response, 6 comments) Short summaryShort summary
Drought events are expected to become more frequent with climate change. Along with these events atmospheric ozone is also expected to increase. Both can stress plants. Here we investigate to what extent these factors modulate the emission of volatile organic compounds (BVOC) from oak plants. We find an antagonistic effect between drought stress and ozone, impacting the emission of different BVOCs, that is indirectly controlled by stomatal opening, allowing plants to controltheir water budget.
Hide
05 Aug 2020 Soil organic carbon decomposition rates in river systems: effect of experimental conditions Man Zhao, Liesbet Jacobs, Steven Bouillon, and Gerard Govers Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-267,https://doi.org/10.5194/bg-2020-267,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
We investigated the relative importance of two individual factors (mechanical disturbance and aquatic microbial organisms) that possibly control SOC decomposition rates in river systems. We found aquatic microbial organisms led to rapid SOC decomposition, while effect of mechanical disturbance is relative minor. We propose a simple conceptual model: mechanical disturbance is only important when soil aggregates are strong enough to withstand the disruptive forces imposed by immersion in water.Hide
05 Aug 2020 Total nitrate uptake by an invasive benthic foraminiferin marine sediments
Constance Choquel, Emmanuelle Geslin, Edouard Metzger, Helena L. Filipsson, Nils Risgaard-Petersen, Patrick Launeau, Manuel Giraud, Thierry Jauffrais, Bruno Jesus, and Aurélia Mouret Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-287,https://doi.org/10.5194/bg-2020-287,2020
Revised manuscript under review for BG (discussion: final response, 7 comments) Short summaryShort summary
Marine microorganisms as foraminifera are able to live temporarily without oxygen in the sediments. In a Swedish fjord subjected to seasonal oxygen scarcity, a change in fauna linked to the decrease in oxygen and the increase in an invasive species was shown. This invasive species respire nitrate until 100 % of the nitrate porewater in the sediment and could be a major contributor of nitrogen balance in oxic coastal ecosystems. Whereas prolonged hypoxia creates unfavorable conditions to survive.Hide
05 Aug 2020 Coastal processes modify projections of some climate-driven stressors in the California Current System Samantha A. Siedlecki, Darren Pilcher, Evan M. Howard, Curtis Deutsch, Parker MacCready, Emily L. Norton, Hartmut Frenzel, Jan Newton, Richard A. Feely, Simone R. Alin, and Terrie Klinger Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-279,https://doi.org/10.5194/bg-2020-279,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Future ocean conditions can be assessed using present trends in fossil fuel use paired with earth system models. Global earth system models generally do not include the full range of local processes important to coastal ecosystems. Compared to global changes, these coastal processes alter the degree of change observed. Higher resolution models that include local processes driven by the global earth system simulations predict modified changes in carbon stressors than projected by global models.Hide
03 Aug 2020 Vertical mobility of pyrogenic organic matter in soils: Acolumn experiment
Marcus Schiedung, Severin-Luca Bellè, Gabriel Sigmund, Karsten Kalbitz, and Samuel Abiven Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-276,https://doi.org/10.5194/bg-2020-276,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
The mobility of pyrogenic organic matter (PyOM) in soils is largely unknow, while it is a major and persistent component of the soil organic matter. With a soil column experiment, we identified that only a small proportion of PyOM can migrate through the soil but its export is continuous. Aging and associated oxidation is increasing its mobility but also its retention in soils. Further, PyOM can alter the vertical mobility of native soil organic carbon during its downwardsmigration.
Hide
03 Aug 2020 Reviews and syntheses: The biogeochemical cycle of silicon in the modern ocean Paul J. Tréguer, Jill N. Sutton, Mark Brzezinski, Matthew A. Charette, Timothy Devries, Stephanie Dutkiewicz, Claudia Ehlert, Jon Hawkings, Aude Leynaert, Su Mei Liu, Natalia Llopis Monferrer, María López-Acosta, Manuel Maldonado, Shaily Rahman, Lihua Ran, and OlivierRouxel
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-274,https://doi.org/10.5194/bg-2020-274,2020
Revised manuscript under review for BG (discussion: final response, 5 comments) Short summaryShort summary
Silicon is the second-most abundant element of the Earth's crust. In this review, we show that silicon inputs and outputs, to and from the world ocean, are 57 % and 18 % higher, respectively, than previous estimates. These changes are significant, modifying factors such as the geochemical residence time of silicon, which is now about 8000 years and two times faster than previously assumed. We also update the total biogenic silica pelagic production and provide an estimate forsponge production.
Hide
03 Aug 2020 The composition of endolithic communities in gypcrete is determined by the specific microhabitat architecture María Cristina Casero, Victoria Meslier, Jocelyne DiRuggiero, Antonio Quesada, Carmen Ascaso, Tomasz Kowaluk, and Jacek Wierzchos Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-245,https://doi.org/10.5194/bg-2020-245,2020
Revised manuscript under review for BG (discussion: final response, 7 comments) Short summaryShort summary
Endolithic microhabitats have been described as the last refuge for life in arid and hyper-arid deserts where life has to deal with harsh environmental conditions, as those in the Atacama Desert. In this work, 3 different endolithic microhabitats occurring in gypcrete rocks of the Atacama Desert are characterized, using both microscopy and molecular techniques, to show if the architecture of each microhabitat has an influence in the microbial communities inhabiting each of them.Hide
03 Aug 2020 Chemical characterization of Punta de Fuencaliente CO2 seeps system (La Palma Island, NE Atlantic Ocean): a new natural laboratory for ocean acidification studies Sara González-Delgado, David González-Santana, Magdalena Santana-Casiano, Melchor González-Dávila, Celso A. Hernández, Carlos Sangil, and José Carlos Hernández Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-232,https://doi.org/10.5194/bg-2020-232,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
In this paper we describe the carbon system dynamics of a new CO2 seep system located off the coast of La Palma island. We explored over a year, finding points with lower levels of pH and alkalinity, high levels of carbon, and poorer levels of aragonite and calcite, both essential for calcifying species. Its seeps are a key feature for robust experimental designs, aimed to comprehend how life has persisted through past Eras or to predict the consequences of Ocean Acidification in marine realm.Hide
03 Aug 2020 Vertical distribution of planktic foraminifera through an Oxygen Minimum Zone: how assemblages and shell morphology reflect oxygen concentrations Catherine V. Davis, Karen Wishner, Willem Renema, and Pincelli M. Hull Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-280,https://doi.org/10.5194/bg-2020-280,2020
Revised manuscript under review for BG (discussion: final response, 4comments)
31 Jul 2020 Increased carbon capture by a silicate-treated forested watershed affected by acid deposition Lyla L. Taylor, Charles T. Driscoll, Peter M. Groffman, Greg H. Rau, Joel D. Blum, and David J. Beerling Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-288,https://doi.org/10.5194/bg-2020-288,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Enhanced rock weathering (ERW) is a Carbon Dioxide Removal (CDR) strategy involving soil amendments with silicate rock dust. Over 15 years, a small silicate application led to net CDR of 8.5–11.5 t CO2/ha in an acid-rain-impacted New Hampshire forest. We accounted for the total carbon cost of treatment and compared effects with an adjacent, untreated forest. Our results suggest ERW can improve the greenhouse-gas balance of similar forests in addition to mitigating acid rain effects.Hide
31 Jul 2020 Biogeochemical Impact of Cable Bacteria on Coastal BlackSea Sediment
Martijn Hermans, Nils Risgaard-Petersen, Filip J. R. Meysman, andCaroline P. Slomp
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-292,https://doi.org/10.5194/bg-2020-292,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
This manuscript demonstrates that the recently discovered cable bacteria are capable of using a mineral, known as siderite, as a source for the formation of iron oxides. This work also demonstrates that the activity of cable bacteria can lead to a distinct subsurface layer in the sediment that can be used as a marker for their activity.Hide
31 Jul 2020 Influence of microorganisms on initial soil formation along a glacier forefield on King George Island, maritime Antarctica Patryk Krauze, Dirk Wagner, Diogo Noses Spinola, and Peter Kühn Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-203,https://doi.org/10.5194/bg-2020-203,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Soils from the recently deglaciated foreland of the Ecology Glacier, King George Island, were analyzed using soil chemical and microbiological methods to gain insight into the state of soil formation and its interplay with microbial activity. In the foreland of the Ecology Glacier, acidification, soil carbon/nitrogen accumulation, and changes in microbial communities and vegetation were observable on a decadal timescale, whereas weathering processes occur centuries/millenia after deglaciation.Hide
29 Jul 2020 Representing methane emissions from wet tropical forest soils using microbial functional groups constrained by soildiffusivity
Debjani Sihi, Xiaofeng Xu, Mónica Salazar Ortiz, Christine S. O'Connell, Whendee L. Silver, Carla López-Lloreda, Julia M. Brenner, Ryan K. Quinn, Jana R. Phillips, Brent D. Newman, and Melanie A. Mayes Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-222,https://doi.org/10.5194/bg-2020-222,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Humid tropical soils are important sources and sinks of methane. We used model simulation to understand how different kinds of microbes and observed soil moisture and oxygen dynamics contribute to production and consumption of methane along a wet tropical hillslope during normal and drought conditions. Drought alters the diffusion of oxygen and microbial substrates into and out of soil microsites, resulting in enhanced methane release from the entire hillslope duringdrought recovery.
Hide
28 Jul 2020 Greenhouse gas emissions from river riparian wetlands: An example from the Inner Mongolia grassland region in China Xinyu Liu, Xixi Lu, Ruihong Yu, Hao Xue, Zhen Qi, Zhengxu Cao, Zhuangzhuang Zhang, and Tingxi Liu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-184,https://doi.org/10.5194/bg-2020-184,2020
Preprint under review for BG (discussion: open, 1 comment) Shortsummary
Short summary
Gradual riparian wetland drying is increasingly sensitive to global warming and contributes to climate change. we analyzed the emissions of CO2, CH4, and N2O from riparian wetlands in the Xilin River Basin to understand the role of these ecosystems in greenhouse gas emissions. Our study showed that anthropogenic activities have extensively changed the hydrological characteristics of the riparian wetlands and might accelerate carbon loss, which could further affect the greenhouse gas emissions.Hide
27 Jul 2020 Using satellite data to identify the methane emission controls of South Sudan's wetlands Sudhanshu Pandey, Sander Houweling, Alba Lorente, Tobias Borsdorff, Maria Tsivlidou, A. Anthony Bloom, Benjamin Poulter, Zhen Zhang, andIlse Aben
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-251,https://doi.org/10.5194/bg-2020-251,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
We use atmospheric methane observations from the novel TROPOMI (Sentinel-5p) satellite instrument to estimate methane emissions from South Sudan's wetlands. Our emission estimates are an order of magnitude larger than the estimate of process-based wetland models. We find that this underestimation by the models is likely due to their misrepresentation of the wetlands' inundation extent and temperaturedependences.
Hide
27 Jul 2020 Patterns in recent and Holocene pollen influxes across Europe; the Pollen Monitoring Programme Database as a tool for vegetation reconstruction Vojtěch Abraham, Sheila Hicks, Helena Svobodová-Svitavská, Elissaveta Bozilova, Sampson Panajiotidis, Mariana Filipova-Marinova, Christin Eldegard Jensen, Spassimir Tonkov, Irena Agnieszka Pidek, Joanna Święta-Musznicka, Marcelina Zimny, Eliso Kvavadze, Anna Filbrandt-Czaja, Martina Hättestrand, Nurgül Karlıoğlu Kılıç, Jana Kosenko, Maria Nosova, Elena Severova, Olga Volkova, Margrét Hallsdóttir, Laimdota Kalniņa, Agnieszka Noryśkiewicz, Bożena Noryśkiewicz, Heather Pardoe, Areti Christodoulou, Tiiu Koff, Sonia L. Fontana, Teija Alenius, Elisabeth Isaksson, Heikki Seppä, Siim Veski, Anna Pędziszewska, Martin Weiser, and Thomas Giesecke Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-217,https://doi.org/10.5194/bg-2020-217,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Pollen traps are plastic bottles recording the pollen rain during the whole year. We analysed them during the last four decades in different regions of Europe from Spitsbergen to Cyprus. The dataset is compared with current vegetation, environmental variables and fossil pollen rain. The relationship to the present vegetation patterns can be used as a tool of vegetation reconstruction in the past. The dataset is available in the Neotoma Palaeoecology Database.Hide
24 Jul 2020 Impacts of biogenic polyunsaturated aldehydes on metabolism and community composition of particle-attached bacteria incoastal hypoxia
Zhengchao Wu, Qian P. Li, Zaiming Ge, Bangqin Huang, and Chunming Dong Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-243,https://doi.org/10.5194/bg-2020-243,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Seasonal hypoxia in the nearshore bottom waters frequently occurs in the Pearl River Estuary. Aerobic respiration is the ultimate cause of local hypoxia. We found an elevated level of polyunsaturated aldehydes in the bottom water outside the estuary, which promoted growth and metabolisms of special groups of particle-attached bacteria and thus contributed to oxygen depletion in hypoxic waters. Our results may be important for understanding of coastal hypoxia and their linkages toeutrophication.
Hide
23 Jul 2020 Ideas and perspectives: A strategic assessment of methane and nitrous oxide measurements in the marine environment Samuel T. Wilson, Alia N. Al-Haj, Annie Bourbonnais, Claudia Frey, Robinson W. Fulweiler, John D. Kessler, Hannah K. Marchant, Jana Milucka, Nicholas E. Ray, Parv Suntharalingham, Brett F. Thornton, Robert C. Upstill-Goddard, Thomas S. Weber, Damian L. Arévalo-Martínez, Hermann W. Bange, Heather M. Benway, Daniele Bianchi, Alberto V. Borges, Bonnie X. Chang, Patrick M. Crill, Daniela A. del Valle, Laura Farías, Samantha B. Joye, Annette Kock, Jabrane Labidi, Cara C. Manning, John W. Pohlman, Gregor Rehder, Katy J. Sparrow, Philippe D. Tortell, Tina Treude, David L. Valentine, Bess B. Ward, Simon Yang, and Leonid N. Yurganov Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-270,https://doi.org/10.5194/bg-2020-270,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
Accurate characterization of climate-relevant gas dynamics is required for all biomes, especially those ecosystems most susceptible to the impact of change. Marine environments include regions that act as net sources or sinks for a number of climate-active trace gases including methane and nitrous oxide. This paper describes the challenges and opportunities for near-future marine methane and nitrous oxide research as discussed in a recent Ocean Carbon & Biogeochemistry sponsored workshop.Hide
23 Jul 2020 Experimental evidence of the potential bioavailability for marine heterotrophic bacteria of aerosols organic matter Kahina Djaoudi, France Van Wambeke, Aude Barani, Najib Bhairy, Servanne Chevaillier, Karine Desboeufs, Sandra Nunige, Mohammed Labiadh, Thierry Henry des Tureaux, Dominique Lefèvre, Amel Nouara, Christos Panagiotopoulos, Marc Tedetti, and Elvira Pulido-Villena Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-187,https://doi.org/10.5194/bg-2020-187,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments) 22 Jul 2020 Measurement and modelling of the dynamics of NH3 surface-atmosphere exchange over the Amazonian rainforest Robbie Ramsay, Chiara F. Di Marco, Mathew R. Heal, Matthias Sörgel, Paulo Artaxo, Meinrat O. Andreae, and Eiko Nemitz Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-219,https://doi.org/10.5194/bg-2020-219,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
The exchange of the gas ammonia between the atmosphere and the surface is an important biogeochemical process, but little is known of this exchange for certain ecosystems, such as the Amazon Rainforest. This study took measurements of ammonia exchange over an Amazon rainforest site, and subsequently modelled the observed deposition and emission patterns. We observed emissions of ammonia from the rainforest, which can be simulated accurately by taking a canopy resistance modelling approach.Hide
22 Jul 2020 Linking intrinsic and apparent relationships between phytoplankton and environmental forcings using machine learning ‐ What are the challenges? Christopher Holder and Anand Gnanadesikan Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-262,https://doi.org/10.5194/bg-2020-262,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
A frequent challenge for marine ecologists is linking small-scale relationships found in a lab to broader relationships observed on large scales in the environment. We investigated whether machine learning (ML) could help connect these small and large-scale relationships. ML can recover the small-scale relationships when the small and large-scale relationships operate on similar time and spatial scales, but this breaks down when the variability in the observations is lost due to time-averaging.Hide
21 Jul 2020 Simulation of soil carbon dynamics in Australia under a framework that better connects spatially explicit data with RᴏᴛʜC
Juhwan Lee, Raphael A. Viscarra Rossel, Zhongkui Luo, and Ying PingWang
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-150,https://doi.org/10.5194/bg-2020-150,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
We performed Rᴏᴛʜ C simulations across Australia. Consistent prediction was enabled by a framework that connects Rᴏᴛʜ C with spatial data. Initialised with measured C fractions, Rᴏᴛʜ C explained 97–98 % of the variation in C under cropping and grazing and 65 % under natural environments. A 100-years simulation showed that the potential for C sequestration and the vulnerability to C loss is least in natural environments, larger in cropping and modified grazing, and greatest in native grazing.Hide
21 Jul 2020 Contrasted release of insoluble elements (Fe, Al, REE, Th, Pa) after dust deposition in seawater: a tank experiment approach Matthieu Roy-Barman, Lorna Folio, Eric Douville, Nathalie Leblond, Fréderic Gazeau, Matthieu Bressac, Thibaut Wagener, Céline Ridame, Karine Desboeufs, and Cécile Guieu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-247,https://doi.org/10.5194/bg-2020-247,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
The release of insoluble elements such as Aluminum (Al), Iron (Fe), Rare Earth Elements (REE), Thorium (Th) and Protactinium (Pa) when Saharan dust fall over the Mediterranean Sea was studied during tank experiments, under present and future climate conditions. Each element exhibited different dissolution kinetics and dissolution fractions (always lower than a few percent). Changes in temperature and/or pH under greenhouse conditions lead to a lower Th release and a higherlight REE release.
Hide
21 Jul 2020 Eukaryotic community composition in the sea surface microlayer across an east-west transect in the Mediterranean Sea Birthe Zäncker, Michael Cunliffe, and Anja Engel Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-249,https://doi.org/10.5194/bg-2020-249,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
Fungi are found in numerous marine environments. Our study found an increased importance of fungi in the Ionian Sea where bacterial and phytoplankton counts were reduced, but organic matter was still available, suggesting fungi might benefit from the reduced competition from bacteria in LNLC regions.Hide
21 Jul 2020 Enrichment of trace metals from acid sulphate soils in sediments of the Kvarken Archipelago, eastern Gulf of Bothnia, BalticSea
Joonas J. Virtasalo, Peter Österholm, Aarno T. Kotilainen, and MatsE. Åström
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-231,https://doi.org/10.5194/bg-2020-231,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
Rivers draining the acid sulphate soils of western Finland deliver large amounts of metals (e.g. Cd, Co, Cu, La, Mn, Ni and Zn) to the coastal sea. To better understand metal enrichment in the seafloor, we analysed metal contents and grain size distribution in 9 sediment cores. The metal contents increase in the 1960s and 1970s, and stay at the high levels afterwards. The enrichment is visible > 25 km out from the river mouths. Organic aggregates are identified as the key seaward metal carriers.Hide
21 Jul 2020 Biotic and abiotic transformation of amino acids in cloud water: Experimental studies and atmospheric implications Saly Jaber, Muriel Joly, Maxence Brissy, Martin Leremboure, Amina Khaled, Barbara Ervens, and Anne-Marie Delort Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-250,https://doi.org/10.5194/bg-2020-250,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Our study is of interest to atmospheric scientists and environmental microbiologists as we show that clouds can be considered a medium where bacteria efficiently degrade and transform amino acids, in competition to chemical processes. As current atmospheric multiphase models are restricted to chemical degradation of organic compounds, our conclusions motivate further model development.Hide
20 Jul 2020 Microbial functional signature in the atmosphericboundary layer
Romie Tignat-Perrier, Aurélien Dommergue, Alban Thollot, Olivier Magand, Timothy M. Vogel, and Catherine Larose Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-236,https://doi.org/10.5194/bg-2020-236,2020
Revised manuscript accepted for BG (discussion: closed, 7 comments)Short summary
Short summary
The adverse atmospheric environmental conditions do not appear suited for microbial life. We conducted the first global comparative metagenomic analysis to find out if airborne microbial communities might be selected by their ability to resist these adverse conditions. The relatively higher concentration of fungi led to the observation of higher proportions of stress-related functions in air. Fungi might likely resist and survive atmospheric physical stress better thanbacteria.
Hide
20 Jul 2020 Deep maxima of phytoplankton biomass, primary production and bacterial production in the Mediterranean Sea during late spring Emilio Marañón, France Van Wambeke, Julia Uitz, Emmanuel S. Boss, María Pérez-Lorenzo, Julie Dinasquet, Nils Haëntjens, Céline Dimier, and Vincent Taillandier Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-261,https://doi.org/10.5194/bg-2020-261,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
The concentration of chlorophyll is commonly used as an indicator of the abundance of photosynthetic plankton (phytoplankton) in lakes and oceans. Our study investigates why a deep chlorophyll maximum, located near the bottom of the upper, illuminated layer, develops in the Mediterranean Sea. We find that the acclimation of cells to low light is the main mechanism involved, and that this deep maximum represents also a maximum in the biomass and carbon fixation activity ofphytoplankton.
Hide
17 Jul 2020 Denitrification in soil as a function of oxygen supply and demand at the microscale Lena Rohe, Bernd Apelt, Hans-Jörg Vogel, Reinhard Well, Gi-Mick Wu, and Steffen Schlüter Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-221,https://doi.org/10.5194/bg-2020-221,2020
Preprint under review for BG (discussion: final response, 8 comments)Short summary
Short summary
This study presents a well-defined and comprehensive experimental setup analyzing total denitrification, i.e. N2O and (N2O+N2) fluxes, in combination with X-ray CT image analysis. (N2O+N2) fluxes were mainly controlled by the interplay of oxygen supply and demand. The former could be estimated by abiotic proxies like the extent of anaerobic soil volumes or diffusivity, whereas the latter was best described by CO2 production or SOM. N2O fluxes additionally depended on the N2O reduction.Hide
17 Jul 2020 Biogenic volatile organic compound ambient mixing ratios and emission rates in the Alaskan Arctic tundra Hélène Angot, Katelyn McErlean, Lu Hu, Dylan B. Millet, Jacques Hueber, Kaixin Cui, Jacob Moss, Catherine Wielgasz, Tyler Milligan, Damien Ketcherside, Marion Syndonia Bret-Harte, and Detlev Helmig Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-235,https://doi.org/10.5194/bg-2020-235,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments) 17 Jul 2020 An observation-based evaluation and ranking of historical Earth System Model simulations for regional downscaling in the northwest North Atlantic Ocean Arnaud Laurent, Katja Fennel, and Angela Kuhn Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-265,https://doi.org/10.5194/bg-2020-265,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
CMIP5 and CMIP6 models, and a high-resolution regional model, were evaluated by comparing historical simulations with observations in the Northwest North Atlantic, a climate-sensitive and biologically productive ocean margin region. Many of the CMIP models performed poorly for biological properties. There is no clear link between model resolution and skill in the global models, but an overall improvement in performance in CMIP6 from CMIP5. The regional model performed best.Hide
17 Jul 2020 Southern Ocean BGC-Argo Detect Under Ice Phytoplankton Growth Before Sea Ice Retreat Mark Hague and Marcello Vichi Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-257,https://doi.org/10.5194/bg-2020-257,2020
Revised manuscript accepted for BG (discussion: closed, 8 comments)Short summary
Short summary
This paper examines the question of what causes the rapid spring growth of microscopic marine algae (phytoplankton) in the ice covered ocean surrounding Antarctica. One prominent hypothesis proposes that the melting of sea ice is the primary cause, while our results suggest that this is only part of the explanation. In particular, we show that phytoplankton are able to start growing before the sea ice melts appreciably, much earlier than previously thought.Hide
16 Jul 2020 Ocean Carbon Uptake Under Aggressive Emission Mitigation Sean Ridge and Galen McKinley Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-254,https://doi.org/10.5194/bg-2020-254,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
Approximately 40 % of the CO2 emissions from fossil fuel combustion and cement production have been absorbed by the ocean. The goal of the UNFCCC Paris Agreement is to reduce CO2 emissions in an attempt to limit global warming to less than 1.5 °C. In the future, we find that reduced CO2 emissions reduces the efficiency of ocean CO2 absorption. Reduced efficiency is mostly due to reduced downward mixing of CO2. This efficiency reduction can be avoided if we don't delay reducing CO2 emissions.Hide
10 Jul 2020 Age distribution, extractability, and stability of mineral-bound organic carbon in central European soils Marion Schrumpf, Klaus Kaiser, Allegra Mayer, Günter Hempel, andSusan Trumbore
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-212,https://doi.org/10.5194/bg-2020-212,2020
Preprint under review for BG (discussion: final response, 5 comments)Short summary
Short summary
Large amounts of organic carbon (OC) in soil are protected against decay by bonding to minerals. We studied the release of mineral-bonded OC by NaF-NaOH extraction and H2O2 oxidation. Unexpectedly, extraction and oxidation removed mineral-bonded OC at roughly constant portions and of similar age distributions, irrespective of mineral composition, land use, and soil depth. The results suggest uniform modes of interactions between OC and minerals across soils in quasi-steadystate with inputs.
Hide
10 Jul 2020 Drought years in peatland rewetting: Rapid vegetation succession can maintain the net CO2 sink function Florian Beyer, Florian Jansen, Gerald Jurasinski, Marian Koch, Birgit Schröder, and Franziska Koebsch Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-215,https://doi.org/10.5194/bg-2020-215,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Increasing drought frequency can jeopardize the restoration of the CO2 sink function in degraded peatlands. We explored the effect of the summer drought 2018 on vegetation development and CO2 exchange in a rewetted fen. Drought triggered a rapid spread of new vegetation, whose CO2 assimilation could partially outweigh the drought-related rise in respiratory CO2 loss. Our study shows important regulatory mechanisms of a rewetted fen to maintain its net CO2 sink function even in a very dry year.Hide
08 Jul 2020 Spatio-temporal variations of lateral and atmospheric carbon fluxes from the Danube Delta Marie-Sophie Maier, Cristian R. Teodoru, and Bernhard Wehrli Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-197,https://doi.org/10.5194/bg-2020-197,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Based on a 2-year monitoring study, we found that the freshwater system of the Danube Delta, Romania, releases carbon dioxide and methane to the atmosphere. The amount of carbon released depends on the freshwater feature (river branches, channels, lakes), season and hydrologic condition, affecting the exchange with the wetland. Spatial upscaling should therefore consider these factors. Furthermore, the Danube Delta increases the amount of carbon reaching the Black Sea viathe Danube River.
Hide
08 Jul 2020 Temporal and spatial mediated changes in subsurface microbial community assemblages and functionsMadison C. Davis
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-238,https://doi.org/10.5194/bg-2020-238,2020
Manuscript not accepted for further review (discussion: closed, 8 comments) Short summaryShort summary
Different patterns of bacterial communities may occur in different groundwater types. Hurricanes and seasons may not always induce perturbations in bacterial communities. Changes in chemistry and local hydrology within the different regions of groundwater appear to have caused the apparent changes in the bacterial communities. Understanding how the microbes in different groundwater regions react to changes is important for groundwater management and conservation.Hide
08 Jul 2020 Differential analysis of prokaryotic communities from pristine mangrove tidal zone sediments reveal distinct structures andfunctional profiles
Carolina Oliveira de Santana, Pieter Spealman, Vânia Maria Maciel Melo, David Gresham, Taíse Bomfim de Jesus, and Fabio AlexandreChinalia
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-181,https://doi.org/10.5194/bg-2020-181,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
This study highlights the influence of tidal zonation on the prokaryotic sediment communities of a pristine mangrove forest. We observed that the variability of environmental factors between tidal zones results in significant differences in structure, diversity and function of prokaryotic populations. Surprisingly, we find the dynamic intertidal zone has the least biodiversity. This suggests that further work is needed in determining the role tidal microhabitat biodiversityhas on mangroves.
Hide
03 Jul 2020 Hysteretic temperature sensitivity of wetland CH4 fluxes explained by substrate availability and microbial activity Kuang-Yu Chang, William J. Riley, Patrick M. Crill, Robert F. Grant, and Scott R. Saleska Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-177,https://doi.org/10.5194/bg-2020-177,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
Methane (CH4) is a strong greenhouse gas that can accelerate climate change and offset mitigation efforts. A key assumption embedded in many large-scale climate models is that ecosystem CH4 emissions can be estimated by fixed temperature relations. Here, we demonstrate that CH4 emissions cannot be parameterized by emergent temperature response alone due to variability driven by microbial and abiotic interactions. We also provide mechanistic understanding for observed CH4 emissionhysteresis.
Hide
03 Jul 2020 A climate-dependent global model of ammonia emissions from chicken farming Jize Jiang, David S. Stevenson, Aimable Uwizeye, Giuseppe Tempio, andMark A. Sutton
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-192,https://doi.org/10.5194/bg-2020-192,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Ammonia is a key water and air pollutant, and impacts human health and climate change. Ammonia emissions mainly originate from agriculture. We find that chicken agriculture contributes to large ammonia emissions, especially in hot and wet regions. These emissions can be greatly affected by the local environment, i.e. temperature and humidity, and also by human management. We develop a model that suggests ammonia emissions from chicken farming are likely to increase under a warming climate.Hide
03 Jul 2020 Photodegradation and biodegradation of dissolved organic matter on the surface of the Greenland Ice Sheet Miranda J. Nicholes, Christopher Williamson, Martyn Tranter, Alexandra Holland, Marian Yallop, and Alexandre Anesio Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-227,https://doi.org/10.5194/bg-2020-227,2020
Preprint under review for BG (discussion: final response, 3 comments)Short summary
Short summary
This incubation experiment assessed the role of solar radiation and heterotrophic bacteria in the degradation of organic carbon in surface ice of the Greenland Ice Sheet. Although ultraviolet radiation was found to alter carbon composition, heterotrophic degradation caused the greatest changes to both carbon composition and quantity. Both processes are likely interlinked within the surface ice and are fundamental to controlling the composition of carbon exported to downstream environments.Hide
03 Jul 2020 New Insight to Niche Partitioning and Ecological Function of Ammonia Oxidizing Archaea in Subtropical Estuarine Ecosystem Yanhong Lu, Shunyan Cheung, Ling Chen, Shuh-Ji Kao, Xiaomin Xia, Jianping Gan, Minhan Dai, and Hongbin Liu Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-223,https://doi.org/10.5194/bg-2020-223,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Through a comprehensive investigation, we observed differential niche-partitioning among diverse AOA sublineages in a typical subtropical estuary. Besides, distinct AOA communities observed at DNA and RNA levels suggested that a strong divergence of ammonia-oxidizing activity among different AOA groups. Our result highlights the importance of identifying major ammonia oxidizers at RNA level infuture studies.
Hide
02 Jul 2020 Sub-soil irrigation does not lower greenhouse gas emission from drained peat meadows Stefan Theodorus Johannes Weideveld, Weier Liu, Merit van den Berg, Leon Peter Maria Lamers, and Christian Fritz Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-230,https://doi.org/10.5194/bg-2020-230,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
Raising the groundwater table trough sub-soil irrigation does not lead to a reduction of GHG emissions from drained peat meadows, even though there was a clear increase in GWT during summer. Most likely, the largest part of the peat oxidation takes place in the top 70 cm of the soil, which stays above the groundwater table with the use of sub-soil irrigation. We conclude that the use of sub-soil irrigation is ineffective as a mitigation measure to sufficiently lower peatoxidation rates.
Hide
02 Jul 2020 Contrasting responses of woody and herbaceous vegetation to altered rainfall characteristics in the Sahel Wim Verbruggen, Guy Schurgers, Stéphanie Horion, Jonas Ardö, Paulo Negri Bernardino, Bernard Cappelaere, Jérôme Demarty, Rasmus Fensholt, Laurent Kergoat, Thomas Sibret, Torbern Tagesson, and HansVerbeeck
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-175,https://doi.org/10.5194/bg-2020-175,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
A large part of Earth's land surface is covered by dryland ecosystems, which are subject to climate extremes that are projected to increase under future climate scenarios. By using a mathematical vegetation model, we studied the impact of single years of extreme rainfall on the vegetation in the Sahel. We found a contrasting response of grasses and trees to these extremes, strongly dependent on the way precipitation is spread over the rainy season, as well as a long-term impact on CO2 uptake.Hide
02 Jul 2020 Reproducible determination of dissolved organic matterphotosensitivity
Alec W. Armstrong, Leanne Powers, and Michael Gonsior Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-207,https://doi.org/10.5194/bg-2020-207,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Living things decay into organic matter, and this material can dissolve into water like tea brewing from tea leaves. Just as dark tea gets its color from absorbing light, this material can absorb light, which can cause chemical reactions that change its nature. We found a way to compare how these materials are affected by light that helps us understand how they interact with the environment, and found that materials from some places are more sensitive to light than others.Hide
01 Jul 2020 Diel and seasonal variability of methane emissions from a shallow and eutrophic pond Wenli Zhang, Shangbin Xiao, Heng Xie, Jia Liu, Dan Lei, and AndreasLorke
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-178,https://doi.org/10.5194/bg-2020-178,2020
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
We analyzed CH4 emissions from a shallow and small eutrophic pond and found that 88.6 % of CH4 emissions was directly released by bubbling. The higher the temperature, the higher the eutrophication level and the greater the amount of methane released. Our study highlights that increasing eutrophication by anthropogenic impacts and climate warming will increase CH4 emissions from ponds, thus representing a positive feedback mechanism to global warming.Hide
30 Jun 2020 Monsoonal forcing controlled cold water coral growth off south-eastern Brazil during the past 160 kyrs André Bahr, Monika Doubrawa, Jürgen Titschack, Gregor Austermann, Dirk Nürnberg, Ana Luiza Albuquerque, Oliver Friedrich, and JacekRaddatz
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-206,https://doi.org/10.5194/bg-2020-206,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
We explore the sensitivity of cold-water corals (CWC) to environmental changes utilizing a multi-proxy approach on a coral-bearing sediment core from off south-eastern Brazil. Our results reveal that over the past 160 kyrs CWCs flourished during glacial high northern latitude cold events (Heinrich Stadials). These periods were associated with anomalous wet phases on the continent enhancing terrigenous nutrient and organic matter supply to the continental margin, boosting food supply to the CWC.Hide
29 Jun 2020 Seed traits and phylogeny explain plant distribution at large geographic scale Kai Chen, Kevin S. Burgess, Fangliang He, Xiang-Yun Yang, Lian-MingGao, and De-Zhu Li
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-186,https://doi.org/10.5194/bg-2020-186,2020
Revised manuscript under review for BG (discussion: final response, 6 comments) Short summaryShort summary
Understanding the mechanisms that shape the geographic distribution of plant species is a central theme of biogeography. In the study, we quantify the joint effects of key seed traits and phylogeny on species' distribution across 1,616 species of seed plants on the basis of a ten-year seed conservation initiative in China. Our findings show that, seed mass, seed mass variability, seed dispersal mode and phylogeny, together explained 40.44 % of the variance in speciesrange size.
Hide
26 Jun 2020 Reduced growth with increased quotas of particulate organic and inorganic carbon in the coccolithophore _Emiliania huxleyi_ under future ocean climate change conditions Yong Zhang, Sinéad Collins, and Kunshan Gao Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-213,https://doi.org/10.5194/bg-2020-213,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
Our results showed that ocean acidification, warming, increased light exposures and reduced nutrients availability significantly reduced growth rate but increased POC and PIC contents per cell in the coccolithophore _Emiliania huxleyi_, implying biogeochemical consequences of future ocean changes on the calcifying microalga. Concurrent changes in nutrient concentrations and _p_CO2 levels predominantly affected growth, photosynthetic carbon fixation and calcification of _E. huxleyi_.Hide
25 Jun 2020 Thermocline depth and euphotic zone thickness regulate the abundance of diazotrophic cyanobacteria in Lake Tanganyika Benedikt Ehrenfels, Maciej Bartosiewicz, Athanasio S. Mbonde, Kathrin B. L. Baumann, Christian Dinkel, Julian Junker, Tumaini Kamulali, Ismael A. Kimirei, Daniel Odermatt, Francesco Pomati, Emmanuel A. Sweke, and Bernhard Wehrli Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-214,https://doi.org/10.5194/bg-2020-214,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Cyanobacterial blooms are a widespread phenomenon, but their formation is poorly understood in nutrient-poor water bodies. During two cruises we collected physical, nutrient, pigment and phytoplankton data to study nitrogen fixing cyanobacteria (diazotrophs) in Lake Tanganyika, Africa. We found that, due to their capability of fixing gaseous nitrogen, diazotrophs thrive when the supply of dissolved inorganic nitrogen to the sun-lit surface waters is low, but phosphorous is still available.Hide
24 Jun 2020 Decoupling of a Douglas fir canopy: a look into the subcanopy with continuous vertical temperature profiles Bart Schilperoort, Miriam Coenders-Gerrits, César Jiménez Rodríguez, Christiaan van der Tol, Bas van de Wiel, and HubertSavenije
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-216,https://doi.org/10.5194/bg-2020-216,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
With the DTS technology we measured a vertical temperature profile in a forest, from the forest floor to above the tree tops. Using this temperature profile we can see which parts of the forest canopy are colder (thus more dense) or warmer (and less dense), and study the effect this has on the suppression of turbulent mixing. This information can be used to improve our knowledge on the interaction between the atmosphere and forests, and improve carbon dioxide flux measurements over forests.Hide
24 Jun 2020 The haplo-diplontic life cycle expands niche space ofcoccolithophores
Joost de Vries, Fanny Monteiro, Glen Wheeler, Alex Poulton, Jelena Godrijan, Federica Cerino, Elisa Malinverno, Gerald Langer, and ColinBrownlee
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-194,https://doi.org/10.5194/bg-2020-194,2020
Revised manuscript accepted for BG (discussion: final response, 6 comments) Short summaryShort summary
Coccolithophores are important calcifying phytoplankton with an overlooked life cycle. We compile a global dataset of marine coccolithophore abundance to investigate the environmental characteristics of each life cycle phase. We find that both phases contribute to coccolithophore abundance and that their different environmental preference increases coccolithophore habitat. Accounting for the life cycle of coccolithophores is thus crucial for understanding their ecology and biogeochemical impact.Hide
22 Jun 2020 Investigating the sensitivity of soil respiration to recent snow cover changes in Alaska using a satellite-based permafrostcarbon model
Yonghong Yi, John S. Kimball, Jennifer D. Watts, Susan M. Natali, Donatella Zona, Junjie Liu, Masahito Ueyama, Hideki Kobayashi, Walter Oechel, and Charles E. Miller Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-182,https://doi.org/10.5194/bg-2020-182,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
We developed a remote sensing driven permafrost carbon model at 1-km to evaluate soil respiration sensitivity to recent snow cover changes across Alaska. Results indicate earlier snow melt enhances soil respiration throughout the growing season and reduces annual carbon uptake, while early cold-season soil respiration is closely linked to the number of snow-free days after surface freezes. These results confirm the critical control of snow cover on annual and seasonal boreal-Arctic carbon cycle.Hide
19 Jun 2020 Spatially resolved evaluation of Earth system models with satellite column averaged CO2 Bettina K. Gier, Michael Buchwitz, Maximilian Reuter, Peter M. Cox, Pierre Friedlingstein, and Veronika Eyring Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-170,https://doi.org/10.5194/bg-2020-170,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Models from the Coupled Model Intercomparison Project (CMIP) Phase 5 and 6 are compared to a satellite data product of column-averaged CO2 mole fractions (XCO2). The previously believed discrepancy of the negative trend in seasonal cycle amplitude in the satellite product which is neither seen in in situ data nor in the models is attributed to a sampling characteristic. Furthermore, CMIP6 models are shown to have made progress in reproducing the observed XCO2 time seriescompared to CMIP5.
Hide
18 Jun 2020 Mg/Ca, Sr/Ca and stable isotope from planktonic foraminifera _T. sacculifer_: testing a multi-proxy approach for inferring paleo-temperature and paleo-salinity Delphine Dissard, Gert Jan Reichart, Christophe Menkes, Morgan Mangeas, Stephan Frickenhaus, and Jelle Bijma Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-208,https://doi.org/10.5194/bg-2020-208,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
Results from an invaluable data set acquired on living foraminifera _T. sacculifer_ collected from surface waters of the Atlantic Ocean are presented, showing that foraminiferal Mg/Ca allow for an accurate reconstruction of SST. When combining equations, δ18Ow can be reconstructed with a precision of ± 0.5 ‰, while successive reconstructions involving Mg/Ca and δ18Oc preclude salinity reconstruction with a precision better than ± 1.69. A direct linear fit to reconstruct salinity could be established.Hide
18 Jun 2020 Variability of the Surface Energy Balance in Permafrost Underlain Boreal Forest Simone Maria Stuenzi, Julia Boike, William Cable, Ulrike Herzschuh, Stefan Kruse, Ljudmila Pestryakova, Thomas Schneider v. Deimling, Sebastian Westermann, Evgenii Zakharov, and Moritz Langer Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-201,https://doi.org/10.5194/bg-2020-201,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Boreal forests in Eastern Siberia are an essential component of global climate patterns. We use a physically-based model and field measurements to study the interactions between forests, permanently frozen ground, and the atmosphere. We find that forests exert a strong control on the thermal state of permafrost through changing snow cover dynamics, and by altering the surface energy balance, through absorbing most of the incoming solar radiation and suppressing below-canopy turbulent fluxes.Hide
16 Jun 2020 Particles under stress: Ultrasonication causes size and recovery rate artifacts with soil derived POM, but not withmicroplastics
Frederick Büks, Gilles Kayser, Antonia Zieger, Friederike Lang, andMartin Kaupenjohann
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-204,https://doi.org/10.5194/bg-2020-204,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Ultrasonication/density fractionation is a common method used to extract particulate organic matter (POM) and, recently, microplastic (MP) from soil samples. In this study, ultrasonic treatment with mechanical stress increasing from 0 to 500 J ml−1 caused comminution and a reduced recovery rate of soil derived POMs, but no such effects with MP particles. In consequence, the extraction of MP from soils is not affected by particle size and recovery rateartifacts.
Hide
16 Jun 2020 Warmer winter causes deepening and intensification of summer subsurface bloom in the Black Sea: the role of convection and self-shading mechanism Elena A. Kubryakova and Arseny A. Kubryakov Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-210,https://doi.org/10.5194/bg-2020-210,2020
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
In a year with cold winter, a larger amount of nutrients is convectively entrained in the upper layer, which increases the growth of phytoplankton in the upper layer and causes self-shading of deeper layers. In years with warm winter convective nutrient fluxes are low, the amount of phytoplankton and light attenuation decreases and light penetrates to the layer of nitrate maximum which causes intense summer deep bloom. The yearly-averaged concentration of chlorophyll in both years is comparable.Hide
15 Jun 2020 Climate change will cause non-analogue vegetation states in Africa and commit vegetation to long-term change Mirjam Pfeiffer, Dushyant Kumar, Carola Martens, and Simon Scheiter Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-179,https://doi.org/10.5194/bg-2020-179,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Lags caused by delayed vegetation response to changing environmental conditions can lead to disequilibrium vegetation states. Awareness of this issue is relevant for ecosystem conservation. We used the aDGVM vegetation model to quantify the difference between transient and equilibrium vegetation states in Africa during the 21st century for two potential climate trajectories. Lag times increased over time and vegetation was non-analogue to any equilibrium state due to multi-lagcomposite states.
Hide
12 Jun 2020 Improving the representation of high-latitude vegetation in Dynamic Global Vegetation Models Peter Horvath, Hui Tang, Rune Halvorsen, Frode Stordal, Lena Merete Tallaksen, Terje Koren Berntsen, and Anders Bryn Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-149,https://doi.org/10.5194/bg-2020-149,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
We evaluated the performance of three methods for representing vegetation cover. Remote sensing provided the best match to a reference dataset, closely followed by distribution modelling (DM), whereas the dynamic global vegetation model (DGVM) in CLM4.5BGCDV deviated strongly from the reference. Sensitivity tests show that use of threshold values for predictors identified by DM may improve DGVM performance. The results highlight the potential of using DM in development and benchmarking of DGVMs.Hide
12 Jun 2020 Fire and vegetation dynamics in North-West Siberia during the last 60 years based on high-resolution remote sensing Oleg Sizov, Ekaterina Ezhova, Petr Tsymbarovich, Andrey Soromotin, Nikolay Prihod'ko, Tuukka Petäjä, Sergej Zilitinkevich, Markku Kulmala, Jaana Bäck, and Kajar Köster Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-174,https://doi.org/10.5194/bg-2020-174,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
Fires in Siberia become increasingly widespread. In changing climate, tundra fires might trigger transition to woodlands and forests, decreasing areas for reindeer pasture and increasing risk of tick-borne diseases. We studied wildfire dynamics and tundra-forest transition within 60 years in North-West Siberia near the Arctic Circle. We analyzed satellite data and ground-based observations, and found that wildfires trigger transition in 40–80 % of dry tundra, compared to 5–15 % without fires.Hide
11 Jun 2020 Cereal-legume mixtures increase net CO2 uptake in a forage system of the Eastern Pyrenees Mercedes Ibañez, Núria Altimir, Àngela Ribas, Werner Eugster, and Maria-Teresa Sebasti Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-173,https://doi.org/10.5194/bg-2020-173,2020
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Our study unravels the influence of forage species on ecosystem scale CO2 fluxes, and is the first long term dataset of a forage system in the Pyrenees. We found strong evidence that cereal legume mixtures enhanced system's CO2 sink capacity compared to cereal monocultures, by enhancing photosynthesis and voluntary regrowth, decisive for the net CO2 budget. This knowledge is crucial to develop climate change mitigation strategies, while ensuring productivity of forage systems.Hide
09 Jun 2020 Plant genotype determines biomass response to flooding frequency in tidal wetlands Svenja Reents, Peter Mueller, Hao Tang, Kai Jensen, and Stefanie Nolte Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-99,https://doi.org/10.5194/bg-2020-99,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
By conducting a flooding experiment with two genotypes of the salt-marsh grass _Elymus athericus_, we show considerable differences in biomass response to flooding within the same species. As biomass production plays a major role in sedimentation processes and thereby salt-marsh accretion, we emphasise the importance to take intraspecific differences into account when evaluating ecosystem resilience to accelerated sea level rise.Hide
09 Jun 2020 Deepening roots can enhance carbonate weathering Hang Wen, Pamela L. Sullivan, Gwendolyn L. Macpherson, Sharon A.Billings, and Li Li
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-180,https://doi.org/10.5194/bg-2020-180,2020
Revised manuscript accepted for BG (discussion: closed, 10 comments) 09 Jun 2020 The Climate Benefit of Carbon Sequestration Carlos A. Sierra, Susan E. Crow, Martin Heimann, Holger Metzler, and Ernst-Detleft Schulze Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-198,https://doi.org/10.5194/bg-2020-198,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
The Climate Benefit of carbon Sequestration (CBS) is a metric developed to quantify avoided warming by two separate processes: the amount of carbon drawdown from the atmosphere, and the time this carbon is stored in a reservoir. This metric can be useful for quantifying the role of forests and soils for climate change mitigation, and to better quantify the benefits of carbon removals bysinks.
Hide
09 Jun 2020 Memory effects on greenhouse gas emissions (CO2, N2O and CH4) following grassland restoration? Lutz Merbold, Charlotte Decock, Werner Eugster, Kathrin Fuchs, Benjamin Wolf, Nina Buchmann, and Lukas Hörtnagl Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-141,https://doi.org/10.5194/bg-2020-141,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Our study investigated the exchange of the three major greenhouse gases (GHG) over a temperate grassland prior and post restoration through tillage in Central Switzerland. Our results show that irregular management events, such as tillage, have considerable effects on GHG emissions in the year of tillage, while leading to enhanced carbon uptake and similar nitrogen losses via nitrous oxide in the years following tillage as observed prior to tillage.Hide
08 Jun 2020 Shift of seed mass and fruit type spectra along longitudinal gradient: high water availability and growth allometry Shunli Yu, Guoxun Wang, Ofir Katz, Danfeng Li, Qibing Wang, Ming Yue,and Canran Liu
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-479,https://doi.org/10.5194/bg-2019-479,2020
Revised manuscript under review for BG (discussion: final response, 3comments)
08 Jun 2020 Ocean-related global change alters lipid biomarker production in common marine phytoplankton Rong Bi, Stefanie M. H. Ismar-Rebitz, Ulrich Sommer, Hailong Zhang,and Meixun Zhao
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-183,https://doi.org/10.5194/bg-2020-183,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Lipids provide crucial insight into the trajectory of ecological functioning in changing environments. We experimentally explore responses of lipid biomarker production in phytoplankton to projected changes in temperature, nutrients and _p_CO2. Differential responses of lipid biomarkers indicate rearrangements of cellular carbon pools under future ocean scenarios. Such variations in lipid biomarker production would have important impacts on marine ecological functions and biogeochemical cycles.Hide
08 Jun 2020 An interrupting mechanism to prevent the formation of coastal hypoxiaby winds Juan Yao, Juying Wang, Hongbin Liu, and Kedong Yin Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-188,https://doi.org/10.5194/bg-2020-188,2020
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Our study finds that winds appear to be a dominant regulating force on the formation of hypoxia in the Pearl River estuarine waters. The wind speed > 6 m/s appears to a threshold above which the water column stratification is destroyed and the formation of bottom hypoxia is interrupted. The frequency of such the above-threshold wind events decreases significantly, implying that climate change induced variability in wind speeds can exasperate the coastal formation of bottom hypoxia in the region.Hide
08 Jun 2020 The suspended small-particles layer in the suboxic Black Sea: a proxy for delineating the effective N2-yielding section Rafael Rasse, Hervé Claustre, and Antoine Poteau Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-167,https://doi.org/10.5194/bg-2020-167,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Here, data collected by BGC-Argo floats are used to investigate the origin of the suspended small-particle layer inferred from optical sensors in the suboxic Black Sea. Our results suggest that this layer is at least partially composed of the microbial communities that produce dinitrogen. We propose that oxygen and the optically derived small-particle layer can be used in combination to refine delineation of the effective N2-yielding section of the Black Sea and oxygen-deficient zones.Hide
04 Jun 2020 Climate data induced uncertainties in simulated carbon fluxes under corn and soybean systemsVaraprasad Bandaru
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-129,https://doi.org/10.5194/bg-2020-129,2020
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Agroecosystem models often rely on climate datasets to assess carbon balance on croplands. However errors in climate datasets may lead to inaccurate assessment of carbon fluxes affecting management and policy decisions targeting carbon friendly agriculture. We studied biases in climate datasets and impacts on simulated carbon fluxes under corn and soybeans. Results suggest that climate datasets display a significant margin of error leading to uncertainty in simulated net carbon balanceupto 66 %.
Hide
04 Jun 2020 Sample preservation and pre-treatment in stable isotope analysis: Implications for the study of aquatic food webs Marc Jürgen Silberberger, Katarzyna Koziorowska-Makuch, Karol Kuliński, and Monika Kędra Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-199,https://doi.org/10.5194/bg-2020-199,2020
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
The use of stable isotope ratios to study food webs, requires multiple decisions about sample preservation and pre-treatments. In this study we demonstrate how different preservation and pre-treatment methods affect the interpretation of stable isotope data and highlight that today's guidelines are not applicable when data are used in Bayesian mixing models. Particularly the identified effects of freezing demonstrate that our understanding of the utilization of organic matter might be biased.Hide
02 Jun 2020 Climate change and elevated CO2 favor forest over savanna under different future scenarios in South Asia Dushyant Kumar, Mirjam Pfeiffer, Camille Gaillard, Liam Langan, andSimon Scheiter
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-169,https://doi.org/10.5194/bg-2020-169,2020
Revised manuscript under review for BG (discussion: final response, 10 comments) Short summaryShort summary
In this paper, we investigated the impact of climate change and rising CO2 on biomes using a vegetation model in South Asia, a region that is often neglected in global modeling studies. Understanding these impacts guide ecosystem management and biodiversity conservation. Our results indicate that savanna regions are at high risk of woody encroachment and transitioning into the forest, and the bioclimatic envelopes of biomes need adjustments to account for shifts caused by climate change and CO2.Hide
02 Jun 2020 The relative importance of photodegradation and biodegradation of terrestrially derived dissolved organic carbon across four lakes of differing trophic status Christopher M. Dempsey, Jennifer A. Brentrup, Sarah Magyan, Lesley B. Knoll, Hilary M. Swain, Evelyn E. Gaiser, Donald P. Morris, Michael T. Ganger, and Craig E. Williamson Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-160,https://doi.org/10.5194/bg-2020-160,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
We looked at how terrestrial dissolved organic carbon from the watersheds of four different lakes responded to both biodegradation (i.e. microbes) and photodegradation (i.e. sunlight). The traditional paradigm is that biodegradation is more important than photodegradation. Our research shows that on short time scales (i.e. 7 days), sunlight is more important than microbes in degrading DOC. Interestingly, the lakes had different responses to sunlight based on their trophic status.Hide
25 May 2020 Variable phytoplankton size distributions reduce the sensitivity of global export flux to climate change Shirley W. Leung, Thomas Weber, Jacob A. Cram, and Curtis Deutsch Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-156,https://doi.org/10.5194/bg-2020-156,2020
Revised manuscript accepted for BG (discussion: closed, 8 comments)Short summary
Short summary
A global model is constrained with empirical relationships to quantify how shifts in sinking particle sizes modulate particulate organic carbon export production changes in a warming ocean. Including the effect of dynamic particle sizes on remineralization reduces the magnitude of predicted 100-year changes in export production by ~14 %. Projections of future export could thus be improved by considering dynamic phytoplankton and particle size-dependent remineralization depths.Hide
20 May 2020 Predicting evapotranspiration from drone-based thermography – a method comparison in a tropical oil palm plantation Florian Ellsäßer, Christian Stiegler, Alexander Röll, Tania June, Hendrayanto, Alexander Knohl, and Dirk Hölscher Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-159,https://doi.org/10.5194/bg-2020-159,2020
Preprint under review for BG (discussion: final response, 5 comments)Short summary
Short summary
Recording land surface temperatures using drones offers new options to predict evapotranspiration based on energy balance models. This study compares predictions from three energy balance models with the eddy covariance method. A model II Deming regression indicates interchangeability for latent heat flux estimates from certain modeling methods and eddy covariance measurements. This complements the available methods for evapotranspiration studies by fine grain and spatially explicit assessments.Hide
20 May 2020 New insights into mechanisms of sunlight-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters Yijun Liu, Jie Yuan, Fu-Jun Yue, Si-Liang Li, Baoli Wang, Mohammad Mohinuzzaman, Xuemei Yang, Nicola Senesi, Xinyu Lao, Longlong Li, Cong-Qiang Liu, Rob M. Ellam, and Khan M. G. Mostofa Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-145,https://doi.org/10.5194/bg-2020-145,2020
Manuscript not accepted for further review (discussion: closed, 5comments)
19 May 2020 Cyanobacteria Blooms in the Baltic Sea: A Review ofModels and Facts
Britta Munkes, Ulrike Löptien, and Heiner Dietze Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-151,https://doi.org/10.5194/bg-2020-151,2020
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
Cyanobacteria blooms can strongly aggravate eutrophication problems of water bodies. Their controls are, however, not comprehensively understood which impedes effective management and protection plans. Here we review the current understanding of cyanobacteria blooms. Juxtapositioning respective field and laboratory studies with state-of-the-art mathematical models reveal substantial uncertainty associated to nutrient demands, grazing and death of cyanobacteria.Hide
18 May 2020 Quasi-tropical cyclone caused anomalous autumn coccolithophore bloom in the Black Sea Sergey V. Stanichny, Elena A. Kubryakova, and Arseny A. Kubryakov Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-165,https://doi.org/10.5194/bg-2020-165,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
In this paper we show that the short-period impact of tropical cyclones can trigger intense long-term bloom of coccolithophores, which are the major marine calcifiers playing an important role in the balance and fluxes of inorganic carbon in the ocean. In our paper we describe the evolution and physical reasons of such unusual bloom observed in autumn 2005 in the Black Sea on the base of satellitedata.
Hide
15 May 2020 Assimilating synthetic Biogeochemical-Argo and ocean colour observations into a global ocean model to inform observingsystem design
David Ford
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-152,https://doi.org/10.5194/bg-2020-152,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Biogeochemical-Argo floats are starting to routinely measure ocean chlorophyll, nutrients, oxygen and pH. This study generated synthetic observations representing two potential Biogeochemical-Argo observing system designs, and created a data assimilation scheme to combine them with an ocean model. The proposed system of 1000 floats brought clear benefits to model results, with additional floats giving further benefit. Existing satellite ocean colour observations gave complementary information.Hide
15 May 2020 Uncovering chemical signatures of salinity gradients through compositional analysis of protein sequences Jeffrey M. Dick, Miao Yu, and Jingqiang Tan Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-146,https://doi.org/10.5194/bg-2020-146,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Differences of salt concentration are widespread in ecosystems. Using protein sequences predicted from DNA of microbial communities, we found that the number of H2O in chemical reactions between proteins tracks environmental salinity gradients. Datasets for proteins in experiments with salt or organic solutes show a similar effect. These relationships between salt concentration and the chemical compositions of proteins demonstrate the impact of geochemical conditions on microbial evolution.Hide
14 May 2020 Implementation of nitrogen cycle in the CLASSIC landmodel
Ali Asaadi and Vivek K. Arora Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-147,https://doi.org/10.5194/bg-2020-147,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
More than a quarter of the current anthropogenic CO2 emissions are taken up by land reducing atmospheric CO2 growth rate. This is because of the CO2 fertilization effect which benefits 80 % of the global vegetation. However, if nitrogen and phosphorus nutrients can't keep up with increasing atmospheric CO2 our terrestrial biosphere can't provide us this ecosystem service. This manuscript implements nitrogen constraints on photosynthesis in a model to understand the mechanismsinvolved.
Hide
14 May 2020 A comparison of bacterial communities from OMZ sediments in the Arabian Sea and the Bay of Bengal reveals major differences in nitrogen turnover and carbon recycling potential Jovitha Lincy and Cathrine Sumathi Manohar Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-162,https://doi.org/10.5194/bg-2020-162,2020
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
We report on sediment microbial communities from the two basins of the northern Indian Ocean, namely the Arabian Sea and the Bay of Bengal. We used a comparative amplicon sequencing, biogeochemical analysis and metagenomic modeling to explore the microbial communities and predict their metabolic potential. This revealed the potential for different pathways of respiration and organic matter turnover, which may add to understanding why the two basins are different in their oxygen concentrations.Hide
13 May 2020 Calculating Canopy Stomatal Conductance from Eddy Covariance Measurements, in Light of the Energy Budget Closure Problem Richard Wehr and Scott R. Saleska Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-154,https://doi.org/10.5194/bg-2020-154,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Water and carbon exchange between plants and the atmosphere is governed by stomata: adjustable pores in the surfaces of leaves. The combined gas conductance of all the stomata in a canopy has long been estimated using an equation that is shown here to be systematically incorrect because it relies on measurements that are generally inadequate. An alternative approach is shown to be more accurate in all probable scenarios and to imply different responses of stomatal conductance to the environment.Hide
11 May 2020 Technical note: Low meteorological influence found in2019 Amazonia fires
Douglas I. Kelley, Chantelle Burton, Chris Huntingford, Megan A. J. Brown, Rhys Whitley, and Ning Dong Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-123,https://doi.org/10.5194/bg-2020-123,2020
Revised manuscript accepted for BG (discussion: final response, 6 comments) Short summaryShort summary
Initial evidence suggests human ignitions or landscape changes caused most Amazon fires during August 2019. However, confirmation is needed that meteorological conditions did not also have a substantial role. Assessing the influence of historical weather on fire frequency, and in an uncertainty framework, we find that 2019 meteorological conditions alone would have meant fewer-than-usual fires. We conclude socio-economic factors likely had a strong role in the high recorded2019 fire activity.
Hide
07 May 2020 Wetter environment and increased grazing reduced the area burned in northern Eurasia: 2002–2016 Wei Min Hao, Matthew C. Reeves, L. Scott Baggett, Yves Balkanski, Philippe Ciais, Bryce L. Nordgren, Alexander Petkov, Rachel E. Corley, Florent Mouillot, Shawn P. Urbanski, and Chao Yue Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-139,https://doi.org/10.5194/bg-2020-139,2020
Preprint under review for BG (discussion: final response, 7 comments)Short summary
Short summary
1) We examined the trends of spatial and temporal distribution of the area burned in northern Eurasia from 2002 to 2016. 2) The annual area burned in this region declined by 53 % during the 15-year period. 3) Grassland fires in Kazakhstan dominated the fire activity, comprising 47 % of the area burned but accounting for 84 % of the decline. 4) Wetter climate and the increase of grazing livestock in Kazakhstan are the major factors contributing to the decline of the area burned.Hide
06 May 2020 Modeling the hydrology and physiology of _Sphagnum_ moss in a northern temperate bog Xiaoying Shi, Daniel M. Ricciuto, Peter E. Thornton, Xiaofeng Xu, Fengming Yuan, Richard J. Norby, Anthony P. Walker, Jeffrey Warren, Jiafu Mao, Paul J. Hanson, Lin Meng, David Weston, and Natalie A.Griffiths
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-90,https://doi.org/10.5194/bg-2020-90,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
The _Sphagnum_ mosses are the important species of wetland ecosystem. To better represent the peatland ecosystem, we introduced the moss species to the land model component (ELM) of the Energy Exascale Earth System Model (E3SM), by developing water content dynamics and non-vascular photosynthetic processes for moss. We tested the model against field observations and used the model to make projections of site carbon cycle under warming and atmospheric CO2 concentrationscenarios.
Hide
04 May 2020 Root uptake under mismatched distributions of water and nutrients in the root zone Jing Yan, Nathaniel A. Bogie, and Teamrat Ghezzehei Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-109,https://doi.org/10.5194/bg-2020-109,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
An uneven supply of water and nutrients in soils often drives how plants behave. We observed that plants extract all their required nutrients from dry soil patches in sufficient quantity, provided adequate water is available elsewhere in the root zone. Roots in nutrient-rich dry patches facilitate the nutrient acquisition by extensive growth, water release, and modifying water retention in their immediate environment. The findings are valuable in managing nutrient losses in agricultural systems.Hide
04 May 2020 Technical note: Seamless gas measurements across Land-Ocean Aquatic Continuum – corrections and evaluation of sensor data for CO2, CH4 and O2 from field deployments in contrastingenvironments
Anna Canning, Arne Körtzinger, Peer Fietzek, and Gregor Rehder Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-128,https://doi.org/10.5194/bg-2020-128,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
The manuscript describes a novel, fully autonomous, multi-gas flow-through setup for multiple gases that combines established high-quality oceanographic sensors in a small and robust system, designed to use across all salinities from all types of platforms. We describe the system and its performance in all relevant detail, including corrections, which improve the accuracy of these sensors. Illustrating how simultaneous multi-gas set up can provide extremely high spatiotemporal resolution.Hide
30 Apr 2020 Unique role of jellyfish in the plankton ecosystem revealed using a global ocean biogeochemical model Rebecca Mary Wright, Corinne Le Quéré, Erik Buitenhuis, Sophie Pitois, and Mark Gibbons Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-136,https://doi.org/10.5194/bg-2020-136,2020
Revised manuscript under review for BG (discussion: final response, 6 comments) Short summaryShort summary
Jellyfish have been included in a global ocean biogeochemical model for the first time. The replication of global mean jellyfish biomass is within the observational range. Jellyfish exert control over the other zooplankton, with the greatest influence on macrozooplankton, and though trophic cascades influence the phytoplankton. The model raises questions about the sensitivity of the zooplankton community to jellyfish mortality and the interactions between macrozooplankton andjellyfish.
Hide
30 Apr 2020 Robust processing of airborne laser scans to plant areadensity profiles
Johan Arnqvist, Julia Freier, and Ebba Dellwik Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-121,https://doi.org/10.5194/bg-2020-121,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
Data generated by airborne laser scans enables characterization of the surface vegetation for any application that might need it, such as forest management, modelling for numerical weather prediction or wind energy estimation. In this work we present a new algorithm for calculating the vegetation density with data from airborne laser scans. The new routine is proven more robust than earlier methods and implementation in popular programming languages accompany the article to support new users.Hide
24 Apr 2020 Timing of drought in the growing season and strong legacy effects determine the annual productivity of temperate grasses in achanging climate
Claudia Hahn, Sara Ernst-Hasler, Andreas Lüscher, and Ansgar Kahmen Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-100,https://doi.org/10.5194/bg-2020-100,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
While existing studies focus on immediate effects of drought events on grassland productivity long-term effects are mostly neglected. But to conclude universal outcomes, studies must consider comprehensive ecosystems mechanisms. In our study we found that the resistance of growth rates to drought in grasses varies across seasons and that positive legacy effects of drought indicate a high resilience. The high resilience compensates immediate drought effects on ANPP to alarge extent.
Hide
23 Apr 2020 Fatty acid carbon isotopes: a new indicator of marine Antarctic paleoproductivity? Kate Ashley, James Bendle, Xavier Crosta, Johan Etourneau, Philippine Campagne, Harry Gilchrist, Uthmaan Ibraheem, Sarah Greene, Sabine Schmidt, Yvette Eley, and Guillaume Massé Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-124,https://doi.org/10.5194/bg-2020-124,2020
Preprint under review for BG (discussion: final response, 8 comments)Short summary
Short summary
We explore the potential for the use of carbon isotopes of algal fatty acid as a new proxy for past primary productivity in Antarctic coastal zones. Coastal polynyas are hotspots of primary productivity and are known to drawdown CO2 from the atmosphere. Reconstructions of past productivity changes could provide a baseline for the role of these areas as sinks for atmospheric CO2.Hide
22 Apr 2020 Seasonal methane dynamics in three different Siberianwater bodies
Ingeborg Bussmann, Irina Fedorova, Bennet Juhls, Pier Paul Overduin,and Matthias Winkel
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-106,https://doi.org/10.5194/bg-2020-106,2020
Revised manuscript under review for BG (discussion: final response, 4comments)
22 Apr 2020 Differential effects of redox conditions on the decomposition of litter and soil organic matter Yang Lin, Ashley N. Campbell, Amrita Bhattacharyya, Nicole DiDonato, Allison M. Thompson, Malak M. Tfaily, Peter S. Nico, Whendee L. Silver, and Jennifer Pett-Ridge Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-59,https://doi.org/10.5194/bg-2020-59,2020
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Soils in tropical forests play an important role of breaking down dead plant tissue and returning carbon to the atmosphere. This process is previously thought to be regulated soil oxygen level. However, we found that the break-down of new plant carbon by soils did not depend on oxygen. Even without oxygen, some soil microbes can use plant carbons in the forms like sugar and protein. Once these compounds were exhausted, oxygen limitation became to influence organic matterbreak-down.
Hide
21 Apr 2020 Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China'sHorqin Sandy Land
Yayi Niu, Yuqiang Li, Hanbo Yun, Xuyang Wang, Xiangwen Gong, YulongDuan, and Jing Liu
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-89,https://doi.org/10.5194/bg-2020-89,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
We report the results from continuous year-round CO2 observations from a sandy grassland in the Horqin Sandy Land using the eddy covariance technique. To quantify the diurnal, seasonal, and annual variation in net ecosystem CO2 exchange, gross primary productivity and ecosystem respiration and identify the different scales environmental factors and the underlying mechanisms. We also explored how the annual precipitation affect the ecosystem net ecosystem CO2 exchange and its componets.Hide
21 Apr 2020 Barium stable isotopes as a fingerprint of biological cycling in the Amazon River Basin Quentin Charbonnier, Julien Bouchez, Jérôme Gaillardet, and ÉricGayer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-81,https://doi.org/10.5194/bg-2020-81,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
The abundance and isotope composition of the trace metal barium (Ba) allows us to track and quantify nutrient cycling throughout the Amazon Basin. In particular, we show that the Ba biological fingerprint evolves from that of a strong net nutrient uptake in the moutainous area of the Andes, towards efficient nutrient recycling in the plains of the Lower Amazon. Our study highlights the fact that the geochemical signature of rock-derived nutrients transported by the Amazon is scarred by Life.Hide
20 Apr 2020 Seasonality, drivers, and isotopic composition of soil CO2 fluxes from tropical forests of the Congo Basin Simon Baumgartner, Matti Barthel, Travis W. Drake, Marijn Bauters, Isaac Ahanamungu Makelele, John Kalume Mugula, Laura Summerauer, Nora Gallarotti, Landry Cizungu Ntaboba, Kristof Van Oost, Pascal Boeckx, Sebastian Doetterl, Roland A. Werner, and Johan Six Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-133,https://doi.org/10.5194/bg-2020-133,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Soil respiration is an important carbon flux and key process determining the net ecosystem production of terrestrial ecosystems. The Congo Basin lacks studies quantifying carbon fluxes. We measured soil CO2 fluxes from different forest types in the Congo Basin and were able to show that, even though soil CO2 fluxes are similarly high in lowland and montane forests, the drivers of them were different: soil moisture in montane forests and C availability in the lowlandforests.
Hide
20 Apr 2020 Phosphorus Transport in Subsurface Flow at Beech Forest Stands: Does Phosphorus Mobilization Keep up with Transport? Michael Rinderer, Jaane Krüger, Friederike Lang, Heike Puhlmann, andMarkus Weiler
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-118,https://doi.org/10.5194/bg-2020-118,2020
Preprint under review for BG (discussion: final response, 5 comments)Short summary
Short summary
To quantify Phosphorus loss from forests by vertical and lateral soil water flow, we conducted six sprinkling experiments at three beech forests in Germany. Out data showed a nutrient flashing (high P concentrations) during the first 2 hours after the onset but no further depletion thereafter. This suggest that the mobilization of P can keep up with its transport. We also showed that the P concentrations decreased with soil depth suggesting an efficient retention of P in the forest soil.Hide
20 Apr 2020 Seasonality of greenhouse gas emission factors from biomass burning in the Brazilian Cerrado Roland Vernooij, Marcos Vinicius Giongo Alves, Marco Assis Borges, Máximo Menezes Costa, Ana Carolina Sena Barradas, and Guido R. vander Werf
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-86,https://doi.org/10.5194/bg-2020-86,2020
Preprint under review for BG (discussion: final response, 2 comments)Short summary
Short summary
We used drones to measure greenhouse gas emission factors from fires in the Brazilian Cerrado. We compared early dry season management fires and late dry season fires to determine if fire management can be a tool in abating emissions. Although we found some evidence of increased CO and CH4 emission factors, the seasonal effect was smaller than in previous studies. For N2O, the third most important greenhouse gas, we found opposite trends in grasses and shrub dominated areas.Hide
14 Apr 2020 Characterization of particle-associated and free-living bacterial and archaeal communities along the water columns of theSouth China Sea
Jiangtao Li, Lingyuan Gu, Shijie Bai, Jie Wang, Lei Su, Bingbing Wei, Li Zhang, and Jiasong Fang Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-115,https://doi.org/10.5194/bg-2020-115,2020
Revised manuscript accepted for BG (discussion: closed, 8 comments)Short summary
Short summary
Few studies have focused on the particle-attached and free-living microbial communities of the deep ocean. Here we determined PA and FL microbial communities along depth profile of the SCS. PA and FL fractions accommodated divergent microbial compositions, and most of them are potentially generalists with PA and FL dual lifestyle. A potential vertical connectivity between surface-specific microbes and those in the deep ocean was indicated likely through microbial attachment to sinking particles.Hide
14 Apr 2020 The fate of upwelled nitrate off Peru shaped by submesoscale filaments and fronts Jaard Hauschildt, Soeren Thomsen, Vincent Echevin, Andreas Oschlies, Yonss Saranga José, Gerd Krahmann, Laura A. Bristow, and Gaute Lavik Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-112,https://doi.org/10.5194/bg-2020-112,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
In this paper we quantify the subduction of upwelled nitrate due to physical processes on the order of several kilometers in the coastal upwelling off Peru and its effect on primary production. We also compare the prepresentation of these processes in a high-resolution simulation (~2.5 km) with a more coarsely resolved simulation (~12 km). To do this, we combine high-resolution shipboard observations of physical and biogeochemical parameters with a complex biogeochemical model configuration.Hide
09 Apr 2020 Silicon isotope fractionation and uptake dynamics of three crop plants: laboratory studies with transient siliconconcentrations
Daniel A. Frick, Rainer Remus, Michael Sommer, Jürgen Augustin, and Friedhelm von Blanckenburg Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-66,https://doi.org/10.5194/bg-2020-66,2020
Revised manuscript accepted for BG (discussion: closed, 9 comments)Short summary
Short summary
Silicon is taken up by some plants to increase structural stability and to develop stress resistance, and is rejected by others. To explore the underlying mechanisms we used the stable isotopes of silicon that shift in their relative abundance depending on the biochemical transformation involved. On species with a rejective (tomato, mustard) and active (wheat) uptake mechanism, grown in hydroculture, we found that the transport of silicic acid is controlled by the precipitation of biogenic opal.Hide
06 Apr 2020 Present past and future of the OMZ in the northern IndianOcean
Tim Rixen, Greg Cowie, Birgit Gaye, Joaquim Goes, Helga do Rosário Gomes, Raleigh R. Hood, Zouhair Lachkar, Henrike Schmidt, Joachim Segschneider, and Arvind Singh Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-82,https://doi.org/10.5194/bg-2020-82,2020
Revised manuscript accepted for BG (discussion: closed, 7 comments)Short summary
Short summary
The northern Indian Ocean hosts an extensive oxygen minimum zones (OMZ), which intensified due to human-induced global changes. This includes the occurrence of anoxic events on the Indian shelf, affects benthic ecosystems, and the pelagic ecosystem structure in the Arabian Sea. Consequences for biogeochemical cycles are unknown, which, in addition to the poor representation of mesoscale features reduces the reliability of predictions of the future OMZ development in the northern Indian Ocean.Hide
03 Apr 2020 Alternation of heterotrophic bacterial and archaeal production along nitrogen and salinity gradients in coastal wetlands Gema L. Batanero, Andy J. Green, Juan A. Amat, Marion Vittecoq, Curtis A. Suttle, and Isabel Reche Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-60,https://doi.org/10.5194/bg-2020-60,2020
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Coastal wetlands provide ecosystem services such as a reduction in nitrogen inputs into coastal waters and storage organic carbon. The rise of sea level will salinize many coastal wetlands. Here, we analyzed the abundance of prokaryotes and the heterotrophic production of bacteria and archaea in wetlands from the Mediterranean coast. We observed a switch from bacterial-dominated production to archaeal-dominated production with increases of anthropogenic nitrogen inputs and salinity.Hide
03 Apr 2020 CO2, CH4 and N2O fluxes along an altitudinal gradient in the northern Ecuadorean Andes: N2O consumption at higher altitudes Paula Alejandra Lamprea Pineda, Marijn Bauters, Hans Verbeeck, Selene Baez, Matti Barthel, and Pascal Boeckx Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-105,https://doi.org/10.5194/bg-2020-105,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Besides the well-known role of tropical forests for CO2 capture, their soils can also consume CH4 and emit N2O, a GHG 300 times stronger than CO2. In this study, we quantified the soil emission/consumption of CO2, CH4 and N2O of tropical forests located in the northern Ecuadorian Andes. We observed a net consumption of N2O at higher altitudes, indicating a probably unaccounted sink. Our results highlight the importance of tropical forests as a means of mitigation to curb global warming.Hide
01 Apr 2020 Effects of environmental and management factors on worldwide maize and soybean yields over the 20th and 21st centuries Tzu-Shun Lin, Yang Song, Atul K. Jain, Peter Lawrence, and Haroon S.Kheshgi
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-68,https://doi.org/10.5194/bg-2020-68,2020
Revised manuscript under review for BG (discussion: final response, 7 comments) Short summaryShort summary
ISAM model was used to estimate soybean and maize crop yields over 1901–2100 driven by changes in environmental factors and management factors. Over the 20th century, each of these factors contributes to the increase in global crop yield with increasing nitrogen fertilizer application the strongest of these drivers for maize and increasing the strongest for soybean. Over the 21st century, changing climate drives yield lower, while rising drives yield higher forboth crops.
Hide
30 Mar 2020 Climate change induced a new intermittent regime of convective ventilation that threatens the Black Sea oxygenation status Arthur Capet, Luc Vandenbulcke, and Marilaure Grégoire Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-76,https://doi.org/10.5194/bg-2020-76,2020
Revised manuscript accepted for BG (discussion: closed, 8 comments)Short summary
Short summary
The Black Sea is 2000 m deep but, due to the specificity of its ventilation regime, only the upper 100 m contain enough oxygen to support marine life such as fishes or cetaceans. In regards to the last 65 years, the oxygenation depth has now been impressively reduced, impacting on marine life and on carbon and nutrient cycling. Here, we evidence that atmospheric warming has induced a significant regime shift in the Black Sea ventilation and relate this to the decrease of oxygen concentration.Hide
27 Mar 2020 Vegetation modulates the impact of climate extremes on gross primary production Milan Flach, Alexander Brenning, Fabian Gans, Markus Reichstein, Sebastian Sippel, and Miguel D. Mahecha Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-80,https://doi.org/10.5194/bg-2020-80,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
Drought and heat events affect the uptake and sequestration of carbon in terrestrial ecosystems. We study the impact of droughts and heatwaves on the uptake of CO2 of different vegetation types at the global scale. We find that agricultural areas are generally strongly affected. Forests instead are not particularly sensitive to the events under scrutiny. This implies different water management strategies of forests, but also a lack of sensitivity in remote sensing derived vegetation activity.Hide
27 Mar 2020 Improved parameterization of the weathering kinetics module in the PROFILE and ForSAFE models Harald Ulrik Sverdrup, Eric H. Oelkers, Martin Erlandsson Lampa, Salim Belyazid, Daniel Kurz, and Cecilia Akselsson Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-464,https://doi.org/10.5194/bg-2019-464,2020
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Equations, parameters and constants describing mineral dissolution kinetics have now been obtained for 113 minerals from 12 major structural groups, comprising all types of minerals encountered in most soils. The PROFILE and ForSAFE weathering sub-model was extended to cover two-dimensional catchments, both in the vertical and the horizontal direction, including the hydrology.Hide
27 Mar 2020 Variable tree rooting strategies improve tropical productivity and evapotranspiration in a dynamic global vegetationmodel
Boris Sakschewski, Werner von Bloh, Markus Drüke, Anna A. Sörensson, Romina Ruscica, Fanny Langerwisch, Maik Billing, Sarah Bereswill, Marina Hirota, Rafael S. Oliveira, Jens Heinke, and Kirsten Thonicke Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-97,https://doi.org/10.5194/bg-2020-97,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
This study shows how local adaptations of tree roots across tropical and sub-tropical South America explain patterns of biome distribution, productivity and evapotranspiration on this continent. By allowing for a high diversity of tree rooting strategies in a dynamic global vegetation model (DGVM) we are able to mechanistically explain patterns of mean rooting depth and the effects on ecosystem functions. The approach can advance DGVMs and Earth System Models.Hide
27 Mar 2020 Evidence of eddy-related deep ocean current variability in the North-East Tropical Pacific Ocean induced by remote gap winds Kaveh Purkiani, André Paul, Annemiek Vink, Maren Walter, Michael Schulz, and Matthias Haeckel Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-77,https://doi.org/10.5194/bg-2020-77,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
There has been a steady increase of interest in mining of deep-sea minerals in the eastern Pacific Ocean recently. The ocean state in this region is known to be highly influenced by rotating body of water (eddies) which some of them can travel long distances in the ocean and impact the deeper layers of the ocean. A better insight of variability of eddy activity in this region is of great help to mitigate the impact of the benthic ecosystem from future potential deep sea miningactivity.
Hide
26 Mar 2020 Bioclimatic traits in statistical properties of daily photosynthetically active radiation Estefanía Muñoz and Andrés Ochoa Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-31,https://doi.org/10.5194/bg-2020-31,2020
Preprint under review for BG (discussion: final response, 5 comments)Short summary
Short summary
In this paper, we present a methodology to analyze the stochastic component of daily solar radiation at the earth's surface in the photosynthetically active spectral band. We found that the shape of the probability distribution functions of the clearness and clear-sky indices exhibit a spatial pattern related to the Köppen climate classification and the Holdridge life zones.Hide
25 Mar 2020 Contrasting juxtaposition of two paradigms for diazotrophy in an Earth System Model of intermediate complexity Ulrike Löptien and Heiner Dietze Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-96,https://doi.org/10.5194/bg-2020-96,2020
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
Nitrogen fixation, conducted by specific microorganisms, makes molecular nitrogen available for marine biota. By this means this process exerts major control on the growth of algae in the ocean. This study compares two contemporary paradigms, anticipating the ecological niche of N-fixing organisms in an Earth System Model. We illustrate respective uncertainties in climate projections and suggest specific observations to advance the reliable representation of nitrogen fixation in numerical models.Hide
20 Mar 2020 Interpretation of kinetic isotope fractionation between aqueous Fe(II) and ferrihydrite under a high degree of microbialreduction
Lei Jiang, Chuanjun Wu, Mingqing Li, Xuegong Li, and Jiwei Li Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-85,https://doi.org/10.5194/bg-2020-85,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
We use ferrihydrite as a terminal electron acceptor to conduct microbial dissimilatory iron reduction experiments. The results show that Fe isotope equilibrium fractionation occurs due to rapid electron transfer and atom exchange (ETAE) between aqueous Fe(II) and Fe(III) on the surface of minerals at a low degree of reduction. At a high degree of reduction, the kinetic isotope fractionation occurs as the amount of absorbed Fe(II) increases and the driving force of ETAEdecreases.
Hide
17 Mar 2020 Interactions between biogeochemical and management factors explain soil organic carbon in Pyrenean grasslands Antonio Rodríguez, Rosa Maria Canals, Josefina Plaixats, Elena Albanell, Haifa Debouk, Jordi Garcia-Pausas, Leticia San Emeterio, Juan José Jimenez, and M.-Teresa Sebasti Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-63,https://doi.org/10.5194/bg-2020-63,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
The novelty of our work is that it presents a series of potential interactions between drivers of soil organic carbon at broad scales in temperate mountain grasslands. Probably the most relevant contribution of our work is that it illustrates the importance of grazing management for soil carbon stocks, indicating that interactions between grazing species and soil nitrogen and herbage quality may be promising paths in order to design further management policies for palliating climate change.Hide
13 Mar 2020 Changes in population depth distribution and oxygen stratification explain the current low condition of the Eastern Baltic Sea cod (_Gadus morhua_) Michele Casini, Martin Hansson, Alessandro Orio, and Karin Limburg Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-74,https://doi.org/10.5194/bg-2020-74,2020
Revised manuscript under review for BG (discussion: final response, 11 comments) Short summaryShort summary
In the past twenty years the condition of the Eastern Baltic cod has dropped with large implications for the fishery. Our results show that during the same time, the cod population has moved deeper, while low-oxygenated waters detrimental for cod growth have shallowed. Cod has thus dwelled more in detrimental waters, which relates to the drop in its condition. This study, using long-term fish and hydrological monitoring data, evidences the impact of deoxygenation on fish biologyand fishing.
Hide
10 Mar 2020 Spring distribution of shelled pteropods across theMediterranean Sea
Roberta Johnson, Clara Manno, and Patrizia Ziveri Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-53,https://doi.org/10.5194/bg-2020-53,2020
Revised manuscript not accepted (discussion: closed, 6 comments) 09 Mar 2020 Effects of spatial variability on the exposure of fish to hypoxia: a modeling analysis for the Gulf of Mexico Elizabeth D. LaBone, Kenneth A. Rose, Dubravko Justic, Haosheng Huang,and Lixia Wang
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-51,https://doi.org/10.5194/bg-2020-51,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
The hypoxic zone is an area of low dissolved oxygen (DO) in the Gulf of Mexico. Fish can be killed by exposure to hypoxia and can be negatively impacted by exposure to low, nonlethal DO concentrations (sublethal DO). We found that high sublethal area resulted in higher exposure and DO variability had a small effect on exposure. There was a large variation in exposure among individuals, that when combined with spatial variability of DO, can result in an underestimation of exposure when averaged.Hide
06 Mar 2020 Seasonal cycling of zinc and cobalt in the Southeast Atlantic along the GEOTRACES GA10 section Neil J. Wyatt, Angela Milne, Eric P. Achterberg, Thomas J. Browning, Heather A. Bouman, E. Malcolm S. Woodward, and Maeve C. Lohan Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-42,https://doi.org/10.5194/bg-2020-42,2020
Revised manuscript under review for BG (discussion: final response, 5 comments) Short summaryShort summary
Using data collected during two expeditions to the South Atlantic ocean, we investigated how the interaction between external sources and biological activity influenced the availability of the trace metals zinc and cobalt. This is important as both metals play essential roles in the metabolism and growth of phytoplankton and thus influence primary productivity of the oceans. We found seasonal changes in both processes that helped explain upper ocean trace metalcycling.
Hide
03 Mar 2020 Modelled potential forest area in the forest-steppe of central Mongolia is about three times of actual forest area Michael Klinge, Choimaa Dulamsuren, Florian Schneider, Stefan Erasmi, Markus Hauck, Uudus Bayarsaikhan, and Daniela Sauer Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-13,https://doi.org/10.5194/bg-2020-13,2020
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
The Mongolian forest-steppe suffers from fire and woodcutting. The forest distribution was analysed by tree biomass, remote sensing and climate data. Tree biomass was reduced at forest edges and in small forest, and high in alluvial forests. The actual tree biomass represented 57 % of that in 1986, prior to extensive fires. Relationships between forests and topographic and climatic parameters enable modelling of potential forest, which is about three times theactual forest area.
Hide
28 Feb 2020 Spatially asynchronous changes in strength and stability of terrestrial net ecosystem productivity Erqian Cui, Chenyu Bian, Yiqi Luo, Shuli Niu, Yingping Wang, andJianyang Xia
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-26,https://doi.org/10.5194/bg-2020-26,2020
Revised manuscript accepted for BG (discussion: closed, 7 comments)Short summary
Short summary
Mean annual NEP is related to the magnitude of carbon sink of a specific ecosystem, while IAVNEP characterizes the stability of such carbon sink. Thus, a better understanding of the co-varying NEP and IAVNEP is critical for locating the major and stable carbon sinks on the land. Based on daily NEP observations from eddy covariance sites, we found local indicators for the spatially varying NEP and IAVNEP,respectively.
Hide
28 Feb 2020 On evapotranspiration and eddy covariance measurementscorrections
Bartosz M. Zawilski
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-43,https://doi.org/10.5194/bg-2020-43,2020
Preprint withdrawn (discussion: closed, 0 comments) Short summaryShort summary
One of the most used techniques in order to assess the greenhouse gases flux is the Eddy Covariance (EC) technique that supposes the mean air vertical speed nullity. While working extensively with another technique used for soil effluxes measurements: dynamically closed chambers, it became obvious that there is a mass flow from the soil, it means that the vertical air speed can only be positive and caused by water evaporation. Based on vapor evaporation rate, EC corrections are very important.Hide
27 Feb 2020 Characterisation of extreme events waves in marine ecosystems: the case of Mediterranean Sea Valeria Di Biagio, Gianpiero Cossarini, Stefano Salon, and CosimoSolidoro
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-34,https://doi.org/10.5194/bg-2020-34,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
Events that can influence the functioning of the earth's ecosystems arouse a growing interest in a changing climate. We propose a method to identify and characterise waves of extreme events affecting marine ecosystems for multi-week periods over wide areas. Our method can be applied to suitable ecosystem variables, and has been used to describe different kinds of Mediterranean phytoplankton blooms through the analysis of the chlorophyll output from a high-resolution model.Hide
25 Feb 2020 Improving maps of forest aboveground biomass: A combined approach using machine learning with a spatial statistical model Shaoqing Dai, Xiaoman Zheng, Lei Gao, Chengdong Xu, Shudi Zuo, Qi Chen, Xiaohua Wei, and Yin Ren Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-36,https://doi.org/10.5194/bg-2020-36,2020
Preprint withdrawn (discussion: closed, 9 comments) Short summaryShort summary
This paper proposes a method to integrate the advantages of machine learning and spatial statistics, different datasets, and multiple environmental covariates to improve the accuracy of aboveground biomass estimation models, which provides a useful reference for climate change mitigation. This combined method can make full use of data from different sources, and realize the complementary advantages of machine learning and spatial statistics, which has important implications for other fields.Hide
25 Feb 2020 Methane efflux from an American bison herd Paul C. Stoy, Adam A. Cook, John E. Dore, William Kleindl, E. N. Jack Brookshire, and Tobias Gerken Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-38,https://doi.org/10.5194/bg-2020-38,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
The reintroduction of American bison creates multiple environmental benefits. Ruminants like bison also emit methane – a potent greenhouse gas – to the atmosphere, which has not been measured to date in a field setting. We measured methane efflux from an American bison herd during winter using eddy covariance. Automated cameras were used to approximate their location to calculate per-animal flux. From the measurements, bison do not emit more methane than the cattle theyoften replace.
Hide
24 Feb 2020 Stable isotopic composition of top consumers in Arctic cryoconite holes: revealing different position in supraglacial trophicnetwork
Tereza Jaroměřská, Jakub Trubač, Krzysztof Zawierucha, Lenka Vondrovicová, Miloslav Devetter, and Jakub D. Žárský Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-46,https://doi.org/10.5194/bg-2020-46,2020
Revised manuscript under review for BG (discussion: final response, 10 comments) Short summaryShort summary
Cryoconite holes are ponds on the glacier surface playing an important role in glacier nutrient pathways. This paper presents the first description of carbon and nitrogen isotopic composition of cryoconite consumers (tardigrades and rotifers) and their potential food. We showed that consumers differ in nitrogen isotopes and carbon isotopes vary between taxa and between glaciers. The study contributes to improving the knowledge about cryoconite hole functioning and itstrophic network.
Hide
20 Feb 2020 Persistent effects of sand extraction on habitats and associated benthic communities in the German Bight Finn Mielck, Rune Michaelis, H. Christian Hass, Sarah Hertel, Caroline Ganal, and Werner Armonies Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-17,https://doi.org/10.5194/bg-2020-17,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Marine sand mining becomes more and more important to nourish fragile coastlines that face the global change. We investigated the largest sand extraction site in the German Bight. The study reveals that after more than 35 years of mining, the excavation pits are still detectable on the seafloor while the sediment composion largly changed. The organic communities living in and on the seafloor were strongly decimated and no recovery is observable towards previous conditions.Hide
19 Feb 2020 A zooplankton diel vertical migration parameterization for coastal marine ecosystem modeling Ariadna Celina Nocera, Dany Dumont, and Irene R. Schloss Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-10,https://doi.org/10.5194/bg-2020-10,2020
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
Zooplankton, which means drifting animals, represents a large class of animals that graze the phytoplankton that grows near the surface of oceans, lakes and estuaries and feed many other organisms of aquatic food webs. It is known that zooplankton migrate vertically every day in the water column to avoid visual predation, a process that is not often represented in ecosystem models. This paper presents a model that simulate this behavior and study its impacts on a coastal oceanenvironment.
Hide
14 Feb 2020 Comment on Ideas and perspectives: is shale gas a major driver of recent increase in global atmospheric methane? by Robert W.Howarth (2019)
Michael D. Lewan
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-419,https://doi.org/10.5194/bg-2019-419,2020
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
A plethora of publicly available data show that the δ13C1 values of shale gas are typically heavier than those of conventional gas. This contradiction renders Howarth's ideas, perspectives,and calculations on methane emissions from shale gas invalid. The plethora of publicly available shale-gas data, also indicates that shale gas and conventional gas on a global basis cannot be readily distinguished based solely on δ13C1 values.Hide
10 Feb 2020 Combining hyperspectral remote sensing and eddy covariance data streams for estimation of vegetation functional traits Javier Pacheco-Labrador, Tarek S. El-Madany, M. Pilar Martin, Rosario Gonzalez-Cascon, Arnaud Carrara, Gerardo Moreno, Oscar Perez-Priego, Tiana Hammer, Heiko Moossen, Kathrin Henkel, Olaf Kolle, David Martini, Vicente Burchard, Christiaan van der Tol, Karl Segl, Markus Reichstein, and Mirco Migliavacca Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-501,https://doi.org/10.5194/bg-2019-501,2020
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
The new generation of sensors on-board satellites have the potential to provide richer information about the function of vegetation than before. This information, nowadays missing, is fundamental to improve our understanding and prediction of carbon and water cycles, and therefore to anticipate effects and responses to Climate Change. In this manuscript we propose a method to exploit the data provided by these satellites to successfully obtain this information key to faceClimate Change.
Hide
05 Feb 2020 Emissions of monoterpenes from new Scots pine foliage: dependency on season, stand age and location and importance for models Ditte Taipale, Juho Aalto, Pauliina Schiestl-Aalto, Markku Kulmala,and Jaana Bäck
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-502,https://doi.org/10.5194/bg-2019-502,2020
Preprint withdrawn (discussion: closed, 8 comments) 04 Feb 2020 Understanding the effect of fire on vegetation composition and gross primary production in a semi-arid shrubland ecosystem using the Ecosystem Demography (EDv2.2) model Karun Pandit, Hamid Dashti, Andrew T. Hudak, Nancy F. Glenn, Alejandro N. Flores, and Douglas J. Shinneman Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-510,https://doi.org/10.5194/bg-2019-510,2020
Preprint under review for BG (discussion: final response, 4 comments)Short summary
Short summary
Our study explores the application of a dynamic global vegetation model, Ecosystem Demography (EDv2.2) to understand temporal dynamics of ecosystem under alternate fire regimes and the spatial behavior of post-fire restoration. Point-based simulations suggested dominance of shrub in a non-fire scenario and contrasting phases of shrub and C3 grass growth for a fire scenario. Regional simulations showed a decline in GPP for fire affected areas for initial couple of years before showing recovery.Hide
04 Feb 2020 Technical Note: A universal method for measuring the thickness of microscopic calcite crystals, based on Bidirectional Circular Polarization Luc Beaufort, Yves Gally, Baptiste Suchéras-Marx, Patrick Ferrand, and Julien Duboisset Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-28,https://doi.org/10.5194/bg-2020-28,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
The coccoliths are major contributors to the particulate inorganic carbon in the ocean. They are extremely difficult to weight because they are too small to be manipulated. We propose a universal method to measure thickness and weight of fine calcite using polarizing microscopy that does not require fine-tuning of the light nor a calibration process. This method named bidirectional circular polarization uses 2 images taken with 2 directions of a circularpolarizer.
Hide
04 Feb 2020 A Lagrangian study of the contribution of the Canary coastal upwelling to the open North Atlantic nitrogen budget Derara Hailegeorgis, Zouhair Lachkar, Christoph Rieper, and NicolasGruber
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-25,https://doi.org/10.5194/bg-2020-25,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Using a Lagrangian modeling approach, this study provides a quantitative analysis of water and nitrogen offshore transport in the Canary Current System. We investigate the timescales, reach, and structure of offshore transport and demonstrate that the Canary upwelling is a key source of nutrients to the open North Atlantic Ocean. Our findings stress the need for improving the representation of the Canary system and other eastern boundary upwelling systems in global coarse-resolution models.Hide
31 Jan 2020 Factors controlling the competition between _Phaeocystis_ and diatoms in the Southern Ocean Cara Nissen and Meike Vogt Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-488,https://doi.org/10.5194/bg-2019-488,2020
Revised manuscript under review for BG (discussion: final response, 4 comments) Short summaryShort summary
Using a regional Southern Ocean ecosystem model, we find that the relative importance of _Phaeocystis_ and diatoms at high latitudes is controlled by iron and temperature variability, with light levels controlling the seasonal succession in coastal areas. Yet, biomass losses via aggregation and grazing matter as well. We show that the seasonal variability of _Phaeocystis_ and diatoms impacts the seasonality of carbon export fluxes, with ramifications for nutrient cycling and food web dynamics.Hide
31 Jan 2020 Oxygen and light determine the pathways of nitrate reduction in a highly saline lake Nicolás Valiente, Franz Jirsa, Thomas Hein, Wolfgang Wanek, Patricia Bonin, and Juan José Gómez-Alday Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-20,https://doi.org/10.5194/bg-2020-20,2020
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Saline lakes are prone to the accumulation of anthropogenic contaminants, making them highly vulnerable environments to nitrate pollution. We used the revised 15N-isotope pairing technique with sediments from a eutrophic hypersaline lake to unravel the nitrate removal pathways carrying on. Our work shows for the first time the coexistence of denitrification, DNRA and anammox in a highly saline/hypersaline lake, with extraordinarily high rates of coupledDNRA-anammox.
Hide
30 Jan 2020 Climate reconstructions based on GDGTs and pollen surface datasets from Mongolia and Siberia: Calibrations and applicability to extremely dry and cold environments Lucas Dugerdil, Sébastien Joannin, Odile Peyron, Isabelle Jouffroy-Bapicot, Boris Vannière, Bazartseren Boldgiv, andGuillemette Ménot
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-475,https://doi.org/10.5194/bg-2019-475,2020
Revised manuscript not accepted (discussion: closed, 5 comments) 14 Jan 2020 The northern European shelf as increasing net sink forCO2
Meike Becker, Are Olsen, Peter Landschützer, Abdirhaman Omar, Gregor Rehder, Christian Rödenbeck, and Ingunn Skjelvan Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-480,https://doi.org/10.5194/bg-2019-480,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
We developed a simple method to refine existing open ocean maps towards different coastal seas. Using a multi linear regression we produced monthly maps of surface ocean _f_CO2 in the northern European coastal seas (North Sea, Baltic Sea, Norwegian Coast and in the Barents Sea) covering a time period from 1998 to 2016. Based on this _f_CO2 map, we calculate trends in surface ocean _f_CO2, pH and the air-sea gas exchange.Hide
13 Jan 2020 Diversity and distribution of Nitrogen Fixation Genes in the Oxygen Minimum Zones of the World Oceans Amal Jayakumar and Bess B. Ward Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-445,https://doi.org/10.5194/bg-2019-445,2020
Revised manuscript accepted for BG (discussion: closed, 4 comments) 10 Jan 2020 Eddy covariance carbon flux in a scrub in the Mexicanhighland
Aurelio Guevara-Escobar, Enrique González-Sosa, Mónica Cervantes-Jiménez, Humberto Suzán-Azpiri, Mónica Elisa Queijeiro-Bolaños, Israel Carrillo-Ángeles, and Victor HugoCambrón-Sandoval
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-460,https://doi.org/10.5194/bg-2019-460,2020
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
All vegetation types can sequester carbon dioxide. We compared ground measurements (Eddy covariance) and remote sensed data (MODIS) of primary production in a semiarid scrub in Mexico. The annual carbon sink for this vegetation type was −283.5 g C m−2 y−1 but MODIS was an underestimate.Hide
08 Jan 2020 Lagged effects dominate the inter-annual variability of the 2010–2015 tropical carbon balance A. Anthony Bloom, Kevin W. Bowman, Junjie Liu, Alexandra G. Konings, John R. Worden, Nicholas C. Parazoo, Victoria Meyer, John T. Reager, Helen M. Worden, Zhe Jiang, Gregory R. Quetin, T. Luke Smallman, Jean-François Exbrayat, Yi Yin, Sassan S. Saatchi, Mathew Williams, and David S. Schimel Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-459,https://doi.org/10.5194/bg-2019-459,2020
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
We use a model of the 2010–2015 tropical land carbon cycle, with satellite measurements of land and atmospheric carbon, to disentangle lagged and concurrent effects (due to past and concurrent meteorological events, respectively) on annual land-atmosphere carbon exchanges. The variability of lagged effects explains most annual 2010–2015 carbon flux variations. We conclude that concurrent and lagged effects need to be accurately resolved to better predict the world's land carbon sink.Hide
02 Jan 2020 Estimation of biogenic volatile organic compound (BVOC) emissions in China using WRF–CLM–MEGAN coupled model Lifei Yin, Zhenying Xu, Mingxu Liu, Tingting Xu, Tiantian Wang, Wenling Liao, Mengmeng Li, Xuhui Cai, Ling Kang, Hongsheng Zhang, andYu Song
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-458,https://doi.org/10.5194/bg-2019-458,2020
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
Biogenic Volatile Organic Compounds (BVOCs) emission of terrestrial vegetation is an important part of biogeochemical cycle. Compared with previous studies which calculate regional BVOC emissions independently, the coupled model WRF-CLM-MEGAN achieves an integrated parameterization of BVOC emissions and other land surface processes, and therefore provides a more reasonable estimate. The model could be further coupled with chemistry module to fully investigate the land-atmosphere interactions.Hide
16 Dec 2019 Calcite and vaterite biosynthesis by nitrate dissimilating bacteria in carbonatogenesis process under aerobic and anaerobic conditions Marwa Eltarahony, Sahar Zaki, Ayman Kamal, and Desouky Abd-El-Haleem Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-444,https://doi.org/10.5194/bg-2019-444,2019
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
This study utilized the bacterial strains in carbonatogenesis process through nitrate reduction under aerobic and anaerobic conditions. The precipitated CaCO3 were characterized, it was either calcite or vaterite. Overall, carbonatogenesis process via nitrate reduction is totally biological, ecofriendly, inexpensive, and promotes CaCO3 precipitations without accumulation of toxic by-product. The produced biosafe CaCO3 would be employed for subsequent environmental and medical applications.Hide
16 Dec 2019 Acidification-vulnerable carbonate system of the East Sea(Japan Sea)
Taehee Na, Jeomshik Hwang, Soyun Kim, Seonghee Jeong, TaeKeun Rho, andTongsup Lee
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-474,https://doi.org/10.5194/bg-2019-474,2019
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
Acidification of the East Sea (ES) deep waters was occurring at fast rates. A small supply of alkalinity by CaCO3 compared to a large supply of DIC by OM decomposition makes the deep waters of the ES vulnerable to acidification by CO2 input. The water age of the ES deep waters is similar to that in the S. Atlantic. However, DIC / TA ratio is much higher in the ES than that in the S. Atlantic. Recent re-initiation of deep-water formation appears to change the carbonate chemistry of deep waters of ES.Hide
10 Dec 2019 Distinct microbial composition and functions in an underground high-temperature hot spring at different depths Shijie Bai and Xiaotong Peng Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-406,https://doi.org/10.5194/bg-2019-406,2019
Preprint withdrawn (discussion: closed, 4 comments) 10 Dec 2019 Landsat NIR band and ELM-FATES sensitivity to forest disturbances and regrowth in the Central Amazon Robinson I. Negrón-Juárez, Jennifer A. Holm, Boris Faybishenko, Daniel Magnabosco-Marra, Rosie A. Fisher, Jacquelyn K. Shuman, Alessandro C. de Araujo, William J. Riley, and Jeffrey Q. Chambers Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-451,https://doi.org/10.5194/bg-2019-451,2019
Revised manuscript accepted for BG (discussion: closed, 6 comments)Short summary
Short summary
The temporal variability of Landsat satellite NIR band captured the dynamics of forest regrowth after disturbances in Central Amazon. This variability was represented by the dynamics of forest regrowth after disturbances was properly represented by the ELM-FATES model (Functionally Assembled Terrestrial Ecosystem Simulator (FATES) in the Energy Exascale Earth System Model (E3SM) Land Model (ELM)).Hide
09 Dec 2019 Reviews and syntheses: Anthropogenically breaking macro-ecospatial chains? – case review of HU Line Yi Lin and Martin Herold Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-418,https://doi.org/10.5194/bg-2019-418,2019
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
This review analyzed the possibility of anthropogenically breaking the macro-ecospatial transition zones, in the case of Hu Line in China. The contribution of this work is of fundamental implication for pointing out a scientific way of further examining the macro-ecological debates such as China's tree-planting drive could falter in a warming world (Nature, 2019).Hide
25 Nov 2019 A hydroclimatic model for the distribution of fire onEarth
Matthias M. Boer, Víctor Resco De Dios, Elisa Z. Stefaniak, and RossA. Bradstock
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-441,https://doi.org/10.5194/bg-2019-441,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Existing global fire models struggle to reproduce the geographical distribution of fire from interactions of climate, vegetation, terrain and land use. We present a new model for global fire potential based on fundamental biophysical constraints controlling fire activity in all biomes. Our global model predicts the potential mean annual fractional burned area as a function of hydroclimatic constraints on the production and (seasonal) desiccation of fuels.Hide
22 Nov 2019 On surface fluxes at night – the virtual chamberapproach
Bruce B. Hicks, Nebila Lichiheb, Deb L. O'Dell, Joel Oetting, Neal S. Eash, Mark Heuer, and Latoya Myles Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-393,https://doi.org/10.5194/bg-2019-393,2019
Manuscript not accepted for further review (discussion: closed, 5comments)
11 Nov 2019 Changes in Particulate and Mineral Associated Organic Carbon with Land Use in Contrasting Soils Sabina Yeasmin, Balwant Singh, Cliff T. Johnston, Donald L. Sparks,and Quan Hua
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-416,https://doi.org/10.5194/bg-2019-416,2019
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
This study demonstrated impact of land use change on organic carbon (OC) pools in four soils with contrasting mineralogy for both surface and sub-surface depths. Bulk soils were isolated into particulate and mineral associated OC by density fractionation, and analysed for mineralogy, OC, nitrogen and isotopic signatures. Results reveal that quantity and quality of OC after land use change was influenced by nature of C input in surface soils and by mineral-organic association in sub-surface soils.Hide
05 Nov 2019 Measuring frequently during peak soil N2O emissions is more important than choosing the time of day to sample Jordi T. Francis Clar and Robert P. Anex Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-396,https://doi.org/10.5194/bg-2019-396,2019
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
The daily pattern of soil nitrous oxide (N2O) emissions has guided the choice of a sampling time meant to maximize the accuracy of N2O flux estimates. We analyzed several years of soil N2O emissions from a highly fertilized system including several difficult-to-measure peak emissions events. In this system, accurate estimation of N2O fluxes requires continuous and frequent sampling, especially during peak events; scheduled sampling based on the daily pattern of emissions provides little benefit.Hide
04 Nov 2019 Validation of a coupled δ2H_n_-alkane-δ18Osugar paleohygrometer approach based on a climate chamber experiment Johannes Hepp, Bruno Glaser, Dieter Juchelka, Christoph Mayr, Kazimierz Rozanski, Imke Kathrin Schäfer, Willibald Stichler, Mario Tuthorn, Roland Zech, and Michael Zech Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-427,https://doi.org/10.5194/bg-2019-427,2019
Manuscript not accepted for further review (discussion: closed, 4comments)
28 Oct 2019 Relationships between leaf δ15N and leaf metallicnutrients
Chongjuan Chen, Yingjie Wu, Shuhan Wang, Zhaotong Liu, and Guoan Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-328,https://doi.org/10.5194/bg-2019-328,2019
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Relationships between leaf δ15N and concentrations of leaf metallic nutrients have not been examined as yet though they could enhance our understanding of N cycling. By analyzing 624 non-N2-fixing plant samples, we first found that leaf δ15N was positively correlated with leaf K, Ca, Mg and Zn, negatively correlated with leaf Fe, and not related to leaf Mn. All of them together explained 55.7 % of variations in leaf δ15N. This study emphasized the significance of metallic nutrients in N cycling.Hide
18 Oct 2019 Phosphorus attenuation in streams by water-column geochemistry and benthic sediment reactive iron Zachary P. Simpson, Richard W. McDowell, and Leo M. Condron Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-400,https://doi.org/10.5194/bg-2019-400,2019
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
Streams buffer phosphorus (P), making it difficult to know how mitigation measures work. We examined this P buffer across 31 diverse streams in Canterbury, New Zealand. We found catchment geology to be a major control for precipitation reactions in the water and the forms of P and iron (Fe) in sediments. Poorly crystalline Fe oxides in sediments predicted chemical sorption of P. These reactions may determine the P available for biota, and further, that Fe cycling is closely related to that of P.Hide
15 Oct 2019 Reshaped acclimation traits of dominant tree species under manipulated rainfall would alter their coexisting relation in a low-subtropical secondary evergreen forest Lei Ouyang, Jianguo Gao, Ping Zhao, Weijun Shen, Xingquan Rao, Liwei Zhu, and Guangyan Ni Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-392,https://doi.org/10.5194/bg-2019-392,2019
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
The different spatial and temporal patterns of water use, together with the contrasting water use strategies, could partly explain the current coexistence of two dominant tree species in South China. Their varying performance under different water conditions implies possible shifts in species dominance within the forest community that were potentially stimulated under future precipitation change scenarios from a long-term perspective.Hide
07 Oct 2019 Simulating oceanic radiocarbon with the FAMOUS GCM: implications for its use as a proxy for ventilation and carbon uptake Jennifer E. Dentith, Ruza F. Ivanovic, Lauren J. Gregoire, Julia C. Tindall, Laura F. Robinson, and Paul J. Valdes Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-365,https://doi.org/10.5194/bg-2019-365,2019
Revised manuscript has not been submitted (discussion: closed, 4 comments) Short summaryShort summary
We have added three new tracers (a dye tracer and two representations of radiocarbon, 14C) into the ocean of the FAMOUS climate model to study large-scale circulation and the marine carbon cycle. The model performs well compared to modern 14C observations, both spatially and temporally. Proxy 14C records are interpreted in terms of water age, but comparing our dye tracer to our 14C tracer, we find that this is only valid in certain areas; elsewhere, the carbon cycle complicatesthe signal.
Hide
02 Oct 2019 Adult life strategy affects distribution patterns in abyssal isopods – implications for conservation in Pacific noduleareas
Saskia Brix, Karen J. Osborn, Stefanie Kaiser, Sarit B. Truskey, Sarah M. Schnurr, Nils Brenke, Marina Malyutina, and Pedro M. Martinez Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-358,https://doi.org/10.5194/bg-2019-358,2019
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
The Clarion Clipperton Fracture Zone (CCZ) located in the Pacific is commercially the most important area of proposed manganese nodule mining. Extraction of these will influence the life and distribution of small deep-sea invertebrates like peracarid crustaceans, of which > 90 % are undescribed species new to science. We are doing a species delimitation approach as baseline for an ecological interpretation of species distribution and discuss the results in light of future deep-sea conservation.Hide
02 Oct 2019 Low CO2 evasion rate from the mangrove surrounding watersof Sundarban
Anirban Akhand, Abhra Chanda, Kenta Watanabe, Sourav Das, Tatsuki Tokoro, Kunal Chakraborty, Sugata Hazra, and Tomohiro Kuwae Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-388,https://doi.org/10.5194/bg-2019-388,2019
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
Globally, mangrove surrounding waters are considered net sources of atmospheric CO2. We estimated the air–water CO2 flux with high temporal resolution in mangrove surrounding waters in the Indian Sundarbans and found that the water can act as a sink or weak source of CO2. We suggest that the CO2 efflux from the mangroves surrounding waters of Sundarbans are much lower than the recently estimated world average, and that such low-efflux areas should be included in global mangrove carbon budgeting.Hide
30 Sep 2019 Trace elements in mussel shells from the Brazos River, Texas: environmental and biological control Alexander A. VanPlantinga and Ethan L. Grossman Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-323,https://doi.org/10.5194/bg-2019-323,2019
Revised manuscript not accepted (discussion: closed, 11 comments)Short summary
Short summary
Modern freshwater mussel shells from the Brazos River, Texas were analyzed for trace element composition in order to build upon previous stable isotope data from the shells and evaluate them as environmental archives. Shell Mn / Ca varied inversely with river discharge and shell manganese is probably ingested in the form of particulate organic matter. The shell Mn / Ca data was used to reconstruct river discharge patterns.Hide
26 Sep 2019 Multi-decadal changes in structural complexity following mass coral mortality on a Caribbean reef George Roff, Jennifer Joseph, and Peter J. Mumby Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-329,https://doi.org/10.5194/bg-2019-329,2019
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
In recent decades, extensive mortality of reef-building corals throughout the Caribbean region has led to erosion of reef frameworks and declines in biodiversity. Using field observations, models and high-precision U-th dating, we quantified changes in structural complexity in the coral reef frameworks over the past two decades. Structural complexity was stable at reef-scales, yet bioerosion led to declines in small-scale microhabitat complexity with cascading effectson cryptic fauna.
Hide
25 Sep 2019 Anoxic monimolimnia: Nutrients devious feeders Areti Gianni and Ierotheos Zacharias Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-349,https://doi.org/10.5194/bg-2019-349,2019
Revised manuscript not accepted (discussion: closed, 5 comments) 23 Sep 2019 Carbonic anhydrase is involved in benthic foraminiferalcalcification
Siham de Goeyse, Alice E. Webb, Gert-Jan Reichart, and Lennart J. deNooijer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-356,https://doi.org/10.5194/bg-2019-356,2019
Revised manuscript accepted for BG (discussion: closed, 4 comments)Short summary
Short summary
Foraminifera are calcifying organism that play a role in the marine inorganic carbon cycle and are widely used to reconstruct paleoclimates. However, the fundamental process by which they calcify remains essentially unknown. Here we use inhibitors to show that an enzyme is speeding up the dehydration of bicarbonate into CO2. This helps the foraminifera acquire sufficient carbon for calcification and might aid their tolerance to elevated CO2 level.Hide
23 Sep 2019 A New Characterization of the Upper Waters of the central Gulf of México based on Water Mass Hydrographic and BiogeochemicalCharacteristics
Gabriela Yareli Cervantes-Diaz, Jose Martín Hernández-Ayón, Alberto Zirino, Sharon Zinah Herzka, Victor Camacho-Ibar, Ivonne Montes, Joël Sudre, and Juan Antonio Delgado Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-340,https://doi.org/10.5194/bg-2019-340,2019
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
In this work we presents a new classification of water masses in the GoM, based on thermohaline properties and dissolved oxygen (DO) concentration using data from a total of five summer and winter cruises carried out primarily in the central GoM. The importance of this redefinition of the water masses contributes to a better understanding of their role in the dynamics of nutrients (and carbon).Hide
20 Sep 2019 Elemental composition of invertebrates shells composed of different CaCO3 polymorphs at different ontogenetic stages: a case study from the brackish Gulf of Gdansk (the Baltic Sea) Anna Piwoni-Piórewicz, Stanislav Strekopytov, Emma Humphreys-Williams, and Piotr Kukliński Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-367,https://doi.org/10.5194/bg-2019-367,2019
Revised manuscript under review for BG (discussion: final response, 4comments)
04 Sep 2019 Formation and origin of Fe-Si oxyhydroxide deposits at the ultra-slow spreading Southwest Indian Ridge Kaiwen Ta, Zijun Wu, Xiaotong Peng, and Zhaofu Luan Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-315,https://doi.org/10.5194/bg-2019-315,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Fe-Si oxyhydroxide deposits are ubiquitously found in hydrothermal environments. Formation process and mechanism on modern hydrothermal Fe-Si oxyhydroxides at ultra-slow spreading centers remain poorly understood. This study suggests that microbial activity plays a significant role in the formation of Fe-Si oxyhydroxides at the at ultra-slow spreading SWIR. Biogenic Fe-Si oxyhydroxides potentially provide insights into the origin and evolution of life in the geologicrecord.
Hide
29 Aug 2019 High-throughput screening of sediment bacterial communities from Oxygen Minimum Zones of the northern Indian Ocean Jovitha Lincy and Cathrine Manohar Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-330,https://doi.org/10.5194/bg-2019-330,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
The study compares the sediment bacterial community structure within the oxygen minimum zone (OMZ) of the Arabian Sea and the Bay of Bengal. Bacterial diversity analysis reveals that the off Paradip site of Bay of Bengal OMZ is highly diverse and unexplored in comparison to the off Goa site of the Arabian Sea OMZ. It is also interesting to note that even though the phylogenetic diversity was different, the relative contribution of functional genes was almost the same.Hide
27 Aug 2019 Insights on nitrogen and phosphorus co-limitation in global croplands from theoretical and modelling fertilizationexperiments
Bruno Ringeval, Marko Kvakić, Laurent Augusto, Philippe Ciais, Daniel Goll, Nathaniel D. Mueller, Christoph Müller, Thomas Nesme, Nicolas Vuichard, Xuhui Wang, and Sylvain Pellerin Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-298,https://doi.org/10.5194/bg-2019-298,2019
Preprint withdrawn (discussion: closed, 5 comments) Short summaryShort summary
Crossed fertilization additions lead to the definition of nutrient interaction categories. However, the implications of such categories in terms of nutrient interaction modeling are not clear. We developed a theoretical analysis of nitrogen and phosphorus fertilization experiments, then applied it to current estimates of nutrient limitation in cropland. We found that a true co-limitation could affect up to 42 % of the global maize area when using a given formalism of nutrient interaction.Hide
26 Aug 2019 High resolution 14C bomb-peak dating and climate response analyses of subseasonal stable isotope signals in wood of the African baobab – A case study from Oman Franziska Slotta, Lukas Wacker, Frank Riedel, Karl-Uwe Heußner, Kai Hartmann, and Gerhard Helle Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-325,https://doi.org/10.5194/bg-2019-325,2019
Preprint under review for BG (discussion: final response, 7 comments)Short summary
Short summary
The African baobab is a challenging climate- and environmental archive for its semi-arid habitat due to dating uncertainties and parenchyma-rich wood anatomy. Annually resolved F14C data of tree-ring cellulose (1941–2005) from a tree in Oman shows the annual character of the baobab's growth rings but were found up to 8.8 % lower than expected for 1964–1967. Sub-seasonal δ13C and δ18O patterns reveal years with low average monsoon rain as well as heavy rainfall events from pre-monsoonal cyclones.Hide
12 Aug 2019 A new approach for assessing climate change impacts inecotron experiments
Inne Vanderkelen, Jakob Zschleischler, Lukas Gudmundsson, Klaus Keuler, Francois Rineau, Natalie Beenaerts, Jaco Vangronsveld, and WimThiery
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-267,https://doi.org/10.5194/bg-2019-267,2019
Manuscript not accepted for further review (discussion: closed, 4comments)
08 Aug 2019 Ideas and perspectives: Emerging contours of a dynamic exogenous kerogen cycleThomas M. Blattmann
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-273,https://doi.org/10.5194/bg-2019-273,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Growing evidence points to the dynamic role that kerogen is playing on the Earth's surface in controlling atmospheric chemistry over geologic time. Although quantitative constraints on weathering of kerogen remain loose, its changing weathering behavior modulated by the activity of glaciers, suggest that this largest pool of reduced carbon on Earth may have played a key part in atmospheric CO2 variability across recent glacial-interglacial times and beyond.Hide
31 Jul 2019 On modeling the Southern Ocean Phytoplankton FunctionalTypes
Svetlana N. Losa, Stephanie Dutkiewicz, Martin Losch, Julia Oelker, Mariana A. Soppa, Scarlett Trimborn, Hongyan Xi, and Astrid Bracher Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-289,https://doi.org/10.5194/bg-2019-289,2019
Manuscript not accepted for further review (discussion: closed, 7 comments) Short summaryShort summary
This study highlights recent advances and challenges of applying coupled physical-biogeochemical modeling for investigating the distribution of the key phytoplankton groups in the Southern Ocean. By leveraging satellite and in situ observations we define numerical ecological model requirements in the phytoplankton trait specification and level of physiological and morphological differentiation for capturing and explaining the observed biogeography of diatoms, coccolithophores and Phaeocystis.Hide
10 Jul 2019 Nitrogen cycling in the Elbe estuary from a joint 3D-modelling and observational perspective Johannes Pein, Annika Eisele, Richard Hofmeister, Tina Sanders, Ute Daewel, Emil V. Stanev, Justus van Beusekom, Joanna Staneva, andCorinna Schrum
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-265,https://doi.org/10.5194/bg-2019-265,2019
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
The Elbe estuary is subject to vigorous tidal forcing from the sea side and considerable biological inputs from the land side. Our 3D numerical coupled physical-biogeochemical integrates these forcing signals and provides highly realistic hindcasts of the associated dynamics. Model simulations show that the freshwater part of Elbe estuary is inhabited by plankton. According to simulations these organism play a key role in converting organic inputs into nitrate, the major inorganic nutrient.Hide
05 Jul 2019 A social-ecological approach to identify and quantify biodiversity tipping points in South America's seasonal dry ecosystems Kirsten Thonicke, Fanny Langerwisch, Matthias Baumann, Pedro J. Leitão, Tomáš Václavík, Ane Alencar, Margareth Simões, Simon Scheiter, Liam Langan, Mercedes Bustamante, Ignacio Gasparri, Marina Hirota, Jan Börner, Raoni Rajao, Britaldo Soares-Filho, Alberto Yanosky, José-Manuel Ochoa-Quinteiro, Lucas Seghezzo, Georgina Conti, and Anne Cristina de la Vega-Leinert Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-221,https://doi.org/10.5194/bg-2019-221,2019
Publication in BG not foreseen (discussion: closed, 2 comments) Shortsummary
Short summary
Tropical dry forests and savannas harbor unique biodiversity and provide critical ecosystem services (ES), yet they are under severe pressure globally. We need to improve our understanding of how and when this pressure provokes tipping points in biodiversity and the associated social-ecological systems. We propose an approach to investigate how drivers leading to natural vegetation decline trigger biodiversity tipping and illustrate it using the example of the Dry Diagonal in South America.Hide
04 Jul 2019 Cryptic role of tetrathionate in the sulfur cycle: A study from Arabian Sea oxygen minimum zone sediments Subhrangshu Mandal, Sabyasachi Bhattacharya, Chayan Roy, Moidu Jameela Rameez, Jagannath Sarkar, Svetlana Fernandes, Tarunendu Mapder, Aditya Peketi, Aninda Mazumdar, and Wriddhiman Ghosh Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-248,https://doi.org/10.5194/bg-2019-248,2019
Manuscript not accepted for further review (discussion: closed, 13 comments) Short summaryShort summary
Sulfur cycling is a crucial component of sediment biogeochemistry within the marine realm. Microbial processes of sulfur cycle work in conjunction with the carbon cycle to remineralize organic matters sequestered in the sea-bed, influenceing metal deposition. Whereas thiosulfate has long been appreciated as a key junction in the sulfur cycle of global marine sediment, the present geomicrobial study brings to the fore hitherto-unappreciated roles of tetrathionate.Hide
01 Jul 2019 C3 plants converge on a universal relationship between leaf maximum carboxylation rate and chlorophyll content Xiaojin Qian, Liangyun Liu, Holly Croft, and Jingming Chen Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-228,https://doi.org/10.5194/bg-2019-228,2019
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
The leaf maximum carboxylation rate (Vcmax) is a key photosynthesis parameter. We attempt to investigate whether a universal and stable relationship exists between leaf Vcmax25 and chlorophyll content across different C3 plant types from a plant physiological perspective and verify it using field experiments. The results confirm that leaf chlorophyll can be a reliable proxy for estimating Vcmax25, providing an operational approach for the global mapping of Vcmax25 across different plant types.Hide
01 Jul 2019 Global database and model on dissolved carbon in soilsolution
Joep Langeveld, Alexander F. Bouwman, Wim Joost van Hoek, Lauriane Vilmin, Arthur H. W. Beusen, José M. Mogollón, and Jack J.Middelburg
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-238,https://doi.org/10.5194/bg-2019-238,2019
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
We compiled a global database on annual average dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) in soil solutions. We use this database to construct the first global models and maps on DOC in soil pore water. Highest concentrations in shallow soils occur in forests of cooler, humid zones. Highest concentrations in deeper soils are calculated for Histosols. Our research enables a spatially explicit first estimation of dissolved carbon in soil solution on theglobal scale.
Hide
18 Jun 2019 Behaviour of Dissolved Phosphorus with the associated nutrients in relation to phytoplankton biomass of the Rajang River-South China Sea continuum Edwin Sien Aun Sia, Jing Zhang, Shan Jiang, Zhuoyi Zhu, Gonzalo Carrasco, Faddrine Holt Jang, Aazani Mujahid, and Moritz Müller Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-219,https://doi.org/10.5194/bg-2019-219,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Nutrient loads carried by large rivers and discharged into the continental shelf and coastal waters are vital to support primary production. Our knowledge of tropical river systems is fragmented with very few seasonal studies available for Southeast Asia (SEA). We present data from three sampling campaigns on the longest river in Malaysia, the Rajang river. Our results show the generalization of SEA as a nutrient hotspot might not hold true for all regions and requires further investigation.Hide
17 Jun 2019 Abiotic CO2 sources confound interpretation of temperature responses of in situ respiration in geothermally warmed forest soils of Iceland Marja Maljanen, Heli Yli-Moijala, Bjarni Didrik Sigurdsson, andChristina Biasi
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-213,https://doi.org/10.5194/bg-2019-213,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
We studied the proportion of biotic and abiotic CO2 fluxes from soil using static chamber method and stable isotope approach from a geothermally warmed area in southern Iceland. These sites can be used cost efficiently to study the effects of soil warming on the ecosystem. However, our study showed that a significant amount of CO2 emitted from the higher warming levels can have non-biotic origin and this has to be taken into account when measuring respiration fluxes on such volcanic sites.Hide
11 Jun 2019 Improving non-representative-sample prediction of forest aboveground biomass maps: A combined machine learning and spatial statistical approach Shaoqing Dai, Xiaoman Zheng, Lei Gao, Shudi Zuo, Qi Chen, Xiaohua Wei,and Yin Ren
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-202,https://doi.org/10.5194/bg-2019-202,2019
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
We propose a low-cost approach that combines machine learning with spatial statistics to construct a regional forest C sequestration map from non-representative sample units. The experimental results demonstrate that the combined methods can improve the accuracy of the C sequestration map. This work provides a useful reference for climate change mitigation and other cases that used non-representative sampleunits.
Hide
06 Jun 2019 The influence of tropical Indian Ocean warming and Indian Ocean Dipole on the surface chlorophyll concentration in the easternArabian Sea
Syam Sankar, Anoop Thondithala Ramachandran, Kemgang Ghomsi Franck Eitel, Dmitry Kondrik, Radharani Sen, Ramesh Madipally, and Lasse H.Pettersson
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-169,https://doi.org/10.5194/bg-2019-169,2019
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
We analyzed the role of Indian Ocean warming and positive Indian Ocean Dipole (IOD) events on the chlorophyll concentrations in the Eastern Arabian Sea (EAS). Positive IOD years were found to be less favorable for inducing coastal upwelling in the region. Significant negative correlation between positive IODs and chlorophyll concentrations show that in the event of occurrence of frequent positive IOD events under a warming regime, the chlorophyll concentration is likely to decrease during fall.Hide
20 May 2019 Using Remote Sensing to Monitor the Spring Phenology of Acadia National Park across Elevational Gradients Yan Liu, Caitlin McDonough MacKenzie, Richard B. Primack, Michael J. Hill, Xiaoyang Zhang, Zhuosen Wang, and Crystal B. Schaaf Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-126,https://doi.org/10.5194/bg-2019-126,2019
Preprint withdrawn (discussion: closed, 6 comments) 20 May 2019 The Holocene Evolution of a Sedimentary Carbon Store in aMid Latitude Fjord
Craig Smeaton, Xingqian Cui, Thomas S. Bianchi, Alix G. Cage, John A. Howe, and William E. N. Austin Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-163,https://doi.org/10.5194/bg-2019-163,2019
Publication in BG not foreseen (discussion: closed, 2 comments) Shortsummary
Short summary
The sediments in fjords are known to be important sites for locking carbon away for long periods of time (thousands of years) but the processes by which climate and human activity influence the development of these coastal carbon stores is poorly understood. A record of long-term sediment burial from a Scottish fjord allows us to investigate the role that humans and climate has played. The results indicate that both climate and humans have an impact on terrestrialecosystems.
Hide
14 May 2019 CO2 and CH4 fluxes are decoupled from organic carbon loss in drying reservoir sediments Tricia Light, Núria Catalán, Santiago Giralt, and Rafael Marcé Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-128,https://doi.org/10.5194/bg-2019-128,2019
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Water reservoir sediments can store large amounts of organic. However, it is unclear what happens to this organic carbon when water reservoirs go dry due to drought, water diversion, etc. Here, we conducted laboratory incubations of reservoir sediment to determine the effect of drying on this stored organic carbon. We found that while some of the organic carbon in water reservoir sediments is released to the atmosphere as reservoirs go dry, other sediment processes can offset these emissions.Hide
07 May 2019 Ventilation dynamics of the Oxygen Minimum Zone in theArabian Sea
Henrike Schmidt, Rena Czeschel, and Martin Visbeck Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-168,https://doi.org/10.5194/bg-2019-168,2019
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Our investigations give a detailed insight on the changing current system at intermediate depth in the Arabian Sea and allow to draw conclusions on ventilation pathways of the oxygen minimum zone and its seasonal variability. In response to the monsoon system the boundary currents change direction and feature a regionally varying ventilationpattern.
Hide
02 May 2019 ENSO-driven fluctuations in oxygen supply and vertical extent of oxygen-poor waters in the oxygen minimum zone of the Eastern Tropical South Pacific Yonss Saranga José, Lothar Stramma, Sunke Schmidtko, and AndreasOschlies
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-155,https://doi.org/10.5194/bg-2019-155,2019
Revised manuscript accepted for BG (discussion: closed, 8 comments)Short summary
Short summary
_In situ_ observations along the Peruvian and Chilean coasts have exhibited variability in the water column oxygen concentration. This variability, which is attributed to the El Niño Southern Oscillation (ENSO), might have implication on the vertical extension of the Eastern Tropical South Pacific (ETSP) oxygen minimum zone. Here using a coupled physical-biogeochemical model, we provide new insights into how ENSO variability affects the vertical extension of the oxygen-poorwaters of the ETSP.
Hide
29 Apr 2019 Tree size and age induced stem carbon content variations cause an uncertainty in forest carbon stock estimation Suhui Ma, Anwar Eziz, Di Tian, Zhengbing Yan, Qiong Cai, Mingwei Jiang, Chengjun Ji, and Jingyun Fang Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-87,https://doi.org/10.5194/bg-2019-87,2019
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
Stem carbon (C) content is one of the important tree traits and widely used to present tree C content to estimate forest C stocks. Based on a 576 age-specific tree organ C content dataset, our results showed that C content of tree varied significantly among organs. Stem C content increased with the increasing tree size and age. Using stem C content as tree C content could produce an error of −2.49 %–5.87 %. This suggests considering tree organ C content of stand in estimating forest C stock.Hide
29 Apr 2019 Impact of metabolic pathways and salinity on the hydrogen isotope ratios of haptophyte lipids Gabriella M. Weiss, David Chivall, Sebastian Kasper, Hideto Nakamura, Fiz da Costa, Philippe Soudant, Jaap S. Sinninghe Damsté, Stefan Schouten, and Marcel T. J. van der Meer Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-147,https://doi.org/10.5194/bg-2019-147,2019
Preprint under review for BG (discussion: final response, 6 comments)Short summary
Short summary
In this study, we used four different haptophyte species and six different organic compounds to investigate the relationship between organic matter synthesis and salinity. We showed that creation in different parts of the cell (chloroplast versus cytosol) determined which compounds retain a correlation between their hydrogen isotopes and salinity. This is important for using hydrogen isotopes to reconstruct salinity in the geologic record.Hide
26 Apr 2019 Vertical partitioning of CO2 production in a DystricCambisol
Patrick Wordell-Dietrich, Axel Don, Anja Wotte, Janet Rethemeyer, Jörg Bachmann, Mirjam Helfrich, Kristina Kirfel, and ChristophLeuschner
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-143,https://doi.org/10.5194/bg-2019-143,2019
Revised manuscript accepted for BG (discussion: closed, 5 comments)Short summary
Short summary
The release of CO2 from soils, known as soil respiration, plays a major role in the global carbon cycle. However, the contribution of different soil depths or the sources of soil CO2 have been only scarcely studied. We quantified the CO2 production for different soil layers (up to 1.5 m) in three soil profiles for 2 years. We found that 90 % of CO2 production occurs in the first 30 cm of the soil profile and that the CO2 originated from young carbon sources, revealed by radiocarbon measurements.Hide
12 Apr 2019 Effect of crustose lichen (_Ochrolecia frigida_) on soil CO2 efflux in a sphagnum moss community over western Alaska tundra Yongwon Kim, Sang-Jong Park, and Bang-Yong Lee Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-121,https://doi.org/10.5194/bg-2019-121,2019
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
Sphagnum moss habitats store large amounts of carbon, which helps reduce thermal insulative capacity and the preservation of permafrost in Subarctic and Arctic. However, airborne infected crustose lichen (_Ochrolecia frigida_) causes the withering to death of sphagnum in permafrost regions. Soil CO2 efflux in crustose lichen was higher than in healthy sphagnum. This demonstrates that higher soil temperature and lower moisture in crustose lichen patches are attributed to enhanced soil CO2 emission.Hide
01 Apr 2019 Methane oxidation potential of the arctic wetland soils of a taiga-tundra ecotone in northeastern Siberia Jun Murase, Atsuko Sugimoto, Ryo Shingubara, Tomoki Morozumi, Shinya Takano, and Trofim C. Maximov Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-98,https://doi.org/10.5194/bg-2019-98,2019
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
We determined the potential methane oxidation rate of the wetland soils in northeastern Siberia in situ or immediately after sampling to avoid the possible influence of sample storage. The soils had a high methane oxidation potential even under anoxic and frozen conditions, while the plant-associated methane oxidation is negligible. The results show the high tolerance and resilience of methane oxidation to the unfavorable conditions, contributing to understanding the methane cycle in the Arctic.Hide
29 Mar 2019 Prioritization of the vector factors controlling _Emiliania huxleyi_ blooms in subarctic and arctic seas: A multidimensional statistical approach Dmitry Kondrik, Eduard Kazakov, Svetlana Chepikova, and DmitryPozdnyakov
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-104,https://doi.org/10.5194/bg-2019-104,2019
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
_Emiliania huxleyi_ species forms in the world's oceans generally huge blooms that affect both the content in the atmosphere of CO2, the major greenhouse gas, and marine ecology. The natural factors conditioning the dynamics of such blooms are many. To unravel the complexity of their conjoint action, and comprehend these blooms spatio-temporal variations, and open the way to predict their further development, sophisticated statistical techniques were employed to confidently rank the factors.Hide
15 Mar 2019 Technical Note: Low Cost Mesocosms Design for Studies of Tropical Marine Environments Ruben R. Raygosa-Barahona, Sebastien Putzeys, Jorge Herrera, andDaniel Pech
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-56,https://doi.org/10.5194/bg-2019-56,2019
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
The effects of tropical climatic conditions on a mesocosm enclosure were studied. An electric marine thruster is used to avoid stratification in the water. Also the mesocosms is submerged in water to maintain the temperature variations within reasonable ranges. With high variations of ambient temperature (> 20 ºC, during the day), the variations in the mesocosm temperature were only 3 ºC. The range of temperature variations were similar to those that occur in certain tropical environments.Hide
13 Mar 2019 Quantifying climatic influences on tree-ring width Guangqi Li, Sandy P. Harrison, and I. Colin Prentice Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-63,https://doi.org/10.5194/bg-2019-63,2019
Publication in BG not foreseen (discussion: closed, 4 comments) Shortsummary
Short summary
Current methods of removing age effect from tree-ring are influenced by sampling biases – older trees are more abundantly sampled for recent decades, when the strongest environmental change happens. New technique of extracting environment-driven signals from tree ring is specifically designed to overcome this bias, drawing on theoretical tree growth. It removes sampling-bias effectively and shows consistent relationships between growth and climates through time and across twoconifer species.
Hide
13 Mar 2019 Transparent exopolymer particle binding of organic and inorganic particles in the Red Sea: Implications for downward transport of biogenic materials Abdullah H. A. Dehwah, Donald M. Anderson, Sheng Li, Francis L. Mallon, Zenon Batang, Abdullah H. Alshahri, Michael Hegy, and ThomasM. Missimer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-59,https://doi.org/10.5194/bg-2019-59,2019
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
Marine gels are an important component of the biochemical composition of seawater. Transparent exopolymer particles (TEP) are gels composed of acidic polysaccharides and other organic compounds that bind with suspended sediments and allow them to travel from the surface to the bottom of the sea. TEP becomes a food supply for the deep ocean and allows bacteria to grow and ultimately become food for growth ofhigher life forms.
Hide
12 Mar 2019 Constraining the soil carbon source to cave-air CO2: evidence from the high-time resolution monitoring soil CO2, cave-air CO2 and its δ13C in Xueyudong, Southwest China Min Cao, Yongjun Jiang, Jiaqi Lei, Qiufang He, Jiaxin Fan, and Ze Zeng Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-66,https://doi.org/10.5194/bg-2019-66,2019
Preprint withdrawn (discussion: closed, 10 comments) Short summaryShort summary
We monitored with high-resolution equipment for two years the CO2 concentration in the overlying soil and the Xueyu cave where a subterranean stream going through to explore their seasonal variational patterns and distinguish the contribution from the soil and stream. Our results show that there are abrupt variations of CO2 in the cave in April and November every year which should be due to the variations in precipitation and temperature. It's better to visit a subtropical karst cave in winter.Hide
11 Mar 2019 Seasonal Sinking rates of Transparent Exopolymer Particles (TEP) concentrations with associated Carbon flux in adjacent Bohai Seaand Yellow Sea M. Shahanul Islam, Jun Sun, Xiaoqian Li, and Xiaoyun Leng Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-58,https://doi.org/10.5194/bg-2019-58,2019
Manuscript not accepted for further review (discussion: closed, 8 comments) Short summaryShort summary
This manuscript expressed several seasonal datasets on TEP and its sinking rates through descriptive comparison with previous work. This paper will provide a clear scenario for further research to the interested scientist about oceanic carbon pool associated with TEP. The manuscript were designed after discussing of TEP assemblage and its sinking variations through different depths with seasonal (autumn, summer & winter) fluctuations in two dynamic seas of China (Bohai Sea& Yellow Sea).
Hide
21 Feb 2019 Water limitation may restrict the positive effect of higher temperatures on weathering rates in forest soils Salim Belyazid, Cecilia Akselsson, and Giuliana Zanchi Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-44,https://doi.org/10.5194/bg-2019-44,2019
Revised manuscript not accepted (discussion: closed, 8 comments) Shortsummary
Short summary
The release of base cations from mineral weathering is expected to increase in response to higher temperatures associated with climate change. By considering the effect of changes in moisture, this study shows that climate change will lead to an increase in weathering rates, but to lower extent than expected due to water limitation. The study uses an integrated forest ecosystem model that simultaneously simulates changes in soil and vegetation and the feedbacks betweenthem.
Hide
19 Feb 2019 Effects of nitrogen deposition on growing-season soil methane sink across global forest biomes Enzai Du, Nan Xia, and Wim de Vries Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-29,https://doi.org/10.5194/bg-2019-29,2019
Preprint withdrawn (discussion: closed, 9 comments) Short summaryShort summary
Based on an analysis of the results from existing N addition experiments, the effect of N deposition on growing-season soil CH4 flux was assessed across global forest biomes. The results showed that growing-season soil CH4 flux was significantly affected by N additions, the effect being dependent on the N addition level and forest biome. This work improves our understanding of biome-specific effect of N deposition on soil CH4 uptake, which should be considered by process-based models.Hide
18 Feb 2019 Reviews and syntheses: Weathering of silicate minerals in soils and watersheds: Parameterization of the weathering kinetics module in the PROFILE and ForSAFE models Harald Ulrik Sverdrup, Eric Oelkers, Martin Erlandsson Lampa, Salim Belyazid, Daniel Kurz, and Cecilia Akselsson Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-38,https://doi.org/10.5194/bg-2019-38,2019
Revised manuscript not accepted (discussion: closed, 7 comments) Shortsummary
Short summary
The present publication documents the kinetic parameterisation of the related PROFILE (steady state) and ForSAFE (integrated dynamics) models. It gives the full coefficient database for about 100 minerals occurring in most soils. The text outlines the principles and methods used in setting the coefficient values. It outlines how the models with the parameterisation based on laboratory kinetics, is successful in estimating field weathering rates similar to what is beingobserved.
Hide
18 Feb 2019 Is the content and potential preservation of soil organic carbon reflected by cation exchange capacity? A case study in Swissforest soils
Emily F. Solly, Valentino Weber, Stephan Zimmermann, Lorenz Walthert, Frank Hagedorn, and Michael W. I. Schmidt Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-33,https://doi.org/10.5194/bg-2019-33,2019
Revised manuscript not accepted (discussion: closed, 11 comments)Short summary
Short summary
Soils are the largest reservoir of carbon on land. In the context of global change, it is important to assess which environmental variables are needed to describe changes in the content of soil organic carbon. We assessed how climatic, vegetation and edaphic variables explain the variance of soil organic carbon content in Swiss forests. Our results provide a first indication that considering the effective cation exchange capacity of soils in future biogeochemical simulations couldbe beneficial.
Hide
15 Feb 2019 Hyposalinity tolerance inthecoccolithophorid _Emiliania huxleyi_ under the influence of ocean acidification involves enhanced photosynthetic performance Jiekai Xu, John Beardall, and Kunshan Gao Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-4,https://doi.org/10.5194/bg-2019-4,2019
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
A lot of papers studying Ocean acidification (OA) have been published while no related reports can be found on the combined effects of OA with decreased salinity on coccolithophores yet.Thus, we investigated the physiological responses of an Emiliania huxleyi strain grown at 2CO2 concentrations and 3 levels of salinity and found cells could tolerate reduced salinity under OA as its increased light capturing capability, which suggests a potential niche extension of coccolithophores in the future.Hide
15 Feb 2019 Role of Microbial Communities in the Weathering and Stalactite Formation in Karst Topography Tung-Yi Huang, Bing-Mu Hsu, Cheng-Wei Fan, Hsin-Chi Tsai, Chien-Yi Tung, and Jung-Sheng Chen Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-12,https://doi.org/10.5194/bg-2019-12,2019
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
This study surveyed the bacterial genetic material from environment around a limestone gulch, namely scrapes on speleothem surface, dripping water through speleothem, earth under a plan limestone wall, and scrapes from the plan wall. By the estimation of bioinformatics prediction, the relative abundance of bacteria inducing calcium precipitation in scrapes of speleothems and the water were about 100 times higher than the plan wall, while weathering related bacteria were plenty on the plan wall.Hide
15 Feb 2019 Environment Gradient related Dissimilatory Nitrate Reduction to Ammonium in Huangmao Sea Estuary: Rates and CommunityDiversity
Ran Jiang, Shu-Xin Zhang, Gou Wei, Rui He, Li-Ling Yang, and Xin-ShengChai
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-31,https://doi.org/10.5194/bg-2019-31,2019
Preprint withdrawn (discussion: closed, 7 comments) Short summaryShort summary
Since the nitrogen related eutrophication has become a severe problem in the Pearl River Delta complex area(PRE) in South China, it is important to have further understanding of nitrogen cycles in this area. The significant geographic and climatic differences in PRE and other estuaries, up to date there is lack of studies about the microbial mediated the dissimilatory nitrate reduction to ammonium(DNRA) pathways. This study provide a better understanding of DNRA in South China estuaries.Hide
14 Feb 2019 Mapping trends in woody cover throughout Namibian savanna with MODIS seasonal phenological metrics and field inventory data Vladimir R. Wingate, Nikolaus J. Kuhn, Stuart R. Phinn, and Cornelisvan der Waal
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-28,https://doi.org/10.5194/bg-2019-28,2019
Manuscript not accepted for further review (discussion: closed, 5comments)
14 Feb 2019 Global variability of carbon use efficiency in terrestrial ecosystems Xiaolu Tang, Nuno Carvalhais, Catarina Moura, Bernhard Ahrens, Sujan Koirala, Shaohui Fan, Fengying Guan, Wenjie Zhang, Sicong Gao, Vincenzo Magliulo, Pauline Buysse, Shibin Liu, Guo Chen, Wunian Yang, Zhen Yu, Jingjing Liang, Leilei Shi, Shenyan Pu, and Markus Reichstein Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-37,https://doi.org/10.5194/bg-2019-37,2019
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
Vegetation CUE is a key measure of carbon transfer from the atmosphere to terrestrial biomass. This study modelled global CUE with published observations using random forest. CUE varied with ecosystem types and spatially decreased with latitude, challenging the previous conclusion that CUE was independent of environmental controls. Our results emphasize a better understanding of environmental controls on CUE to reduce uncertainties in prognostic land-process modelsimulations.
Hide
12 Feb 2019 Diversity, distribution and nitrogen use strategies of bacteria in the South China Sea basin Yuan-Yuan Li, Xiao-Huang Chen, Peng-Fei Wu, Dong-Xu Li, Lin Lin, andDa-Zhi Wang
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-529,https://doi.org/10.5194/bg-2018-529,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Systematic studies on diversities and nitrogen use strategies of bacterial communities in the South China Sea basin are still scarce. Here, we applied high-throughput sequencing, bioinformatic analysis and qPCR assays, and found that the depth was a significant explanatory variable for the bacterial populations from different water masses. Amino acids and ammonium were the major nitrogen sources for bacteria while urea, ammonia and nitrite played vital roles in different regions of the basin.Hide
23 Jan 2019 Drivers of 21st Century carbon cycle variability in the North Atlantic Ocean Matthew P. Couldrey, Kevin I. C. Oliver, Andrew Yool, Paul R. Halloran, and Eric P. Achterberg Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-16,https://doi.org/10.5194/bg-2019-16,2019
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Determining how much carbon dioxide (CO2) the oceans absorb is key to predicting human-caused climate change. A computer model of the ocean shows how the North Atlantic will change up to the end of the century. Year-to-year variations are mostly caused by changes in ocean temperature and seawater chemistry, altering CO2 solubility. By 2100, human emissions cause the biggest changes. The near term changes are physically driven, which may be more predictable than biologicalchanges.
Hide
14 Jan 2019 Response of soil respiration and soil microbial biomass carbon and nitrogen to grazing management in the Loess Plateau, China Zhen Wang, Xiuli Wan, Mei Tian, Xiaoyan Wang, Junbo Chen, Xianjiang Chen, Shenghua Chang, and Fujiang Hou Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-531,https://doi.org/10.5194/bg-2018-531,2019
Manuscript not accepted for further review (discussion: closed, 10 comments) Short summaryShort summary
A two-year soil respiration were measured in a long-term rotational grazing experiment plots with precise grazing intensity in warm and cold season grazing grassland on the Loess Plateau, China. We found grazing season and grazing patterns significantly affected the rate of soil respiration. Grazing intensities tended to increase soil microbial biomass carbon and soil microbial biomass nitrogen, while grazing season had little effect on soil microbial biomass nitrogen.Hide
10 Dec 2018 The role of hydrodynamic and biogeochemistry on CO2 flux and _p_CO2 at the Amazon River mouth Diani F. S. Less, Alan C. Cunha, Henrique O. Sawakuchi, Vania Neu, Aline M. Valério, Nicholas D. Ward, Daimio C. Brito, Joel E. M. Diniz, William Gagne-Maynard, Carlos M. Abreu, Milton Kampel, Alex V. Krusche, and Jeffrey E. Richey Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-465,https://doi.org/10.5194/bg-2018-465,2018
Preprint withdrawn (discussion: closed, 3 comments) Short summaryShort summary
Biogeochemistry studies focused in carbon cycle in the Amazon River mouth are scarce. Our study provided a long-term quantification of CO2 fluxes and _p_CO2 and evaluation of the most important hydrodynamic, biogeochemical and meteorological parameters related to them. The highest FCO2 and _p_CO2 was obtained at high discharge season, water and air temperatures, dissolved oxygen, dissolved organic carbon, nitrate, dissolved inorganic nitrogen and pH could be considered predictors for _p_CO2 and FCO2.Hide
05 Dec 2018 Effects of dry and wet Saharan dust deposition in the tropical North Atlantic Ocean Laura F. Korte, Franziska Pausch, Scarlett Trimborn, Corina P. D. Brussaard, Geert-Jan A. Brummer, Michèlle van der Does, Catarina V. Guerreiro, Laura T. Schreuder, Chris I. Munday, and Jan-Berend W.Stuut
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-484,https://doi.org/10.5194/bg-2018-484,2018
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
This paper shows the differences of nutrient release after dry and wet Saharan dust deposition in the tropical North Atlantic Ocean at 12° N. Incubation experiments were conducted along an east-west transect. Large differences were observed between both deposition types with wet deposition being the dominant source of phosphate, silicate, and iron. Both deposition types suggest that Saharan dust particles might be incorporated into marine snow aggregates and act asballast mineral.
Hide
22 Nov 2018 Silicon cycled by tropical forest trees: effects of species, elevation and bedrock on Mount Kinabalu, Malaysia Ryosuke Nakamura, Hidehiro Ishizawa, Rota Wagai, Shizuo Suzuki, Kanehiro Kitayama, and Kaoru Kitajima Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-447,https://doi.org/10.5194/bg-2018-447,2018
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
Silicon (Si) accumulation by plants should affect biogeochemical cycling of Si, but its geographical patterns are unknown for tropical forests. Comparing forests from 700–3100 m a.s.l. on Mt. Kinabalu, we demonstrate for the first time that lowland forests include more trees with high Si concentrations and have greater annual Si flux via leaf litter, regardless of the bedrock types. Our data of 71 tree species strongly suggest the importance of plant traits in modulating ecosystem Si cycling.Hide
15 Nov 2018 Variation of key elements in soils and plant tissues in subalpine forests of the northern Rocky Mountains, USA David P. Pompeani, Kendra K. McLauchlan, Barrie V. Chileen, Kyra D. Wolf, and Philip E. Higuera Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-443,https://doi.org/10.5194/bg-2018-443,2018
Revised manuscript not accepted (discussion: closed, 4 comments) 09 Nov 2018 Different sensitivities of litter decomposition and nutrient release to ultraviolet radiation Weiming Yan, Zhouping Shangguan, and Yangquanwei Zhong Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-445,https://doi.org/10.5194/bg-2018-445,2018
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Ultraviolet (UV) radiation is an important driver of litter decomposition in ecosystems. In this study, we determined the response of litter decomposition and nutrient release to UV changes using the meta-analysis based on global data. We found that UV plays an important role in litter decomposition in areas of relatively low precipitation and the effect on litter decomposition depends on many factors. Our results suggested changes in UV radiation altered C and N cycling during decomposition.Hide
08 Nov 2018 The Mediterranean subsurface phytoplankton dynamics and their impact on Mediterranean bioregions Julien Palmiéri, Jean-Claude Dutay, Fabrizio D'Ortenzio, Loïc Houpert, Nicolas Mayot, and Laurent Bopp Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-423,https://doi.org/10.5194/bg-2018-423,2018
Manuscript not accepted for further review (discussion: closed, 8 comments) Short summaryShort summary
In this model study, we highlight the importance of the subsurface phytoplankton dynamic in the Mediterranean sea. Comparing surface chlorophyll annual cycle to vertically integrated one, we show how important the subsurface phytoplankton community is, throughout the Mediterranean. It shows that surface chlorophyll is incomplete and cannot alone be considered a good proxy of the total phytoplankton biomass. Then, we decrypt some deep chlorophyll maximum mechanisms in the low production area.Hide
06 Nov 2018 Alkalinity and nitrate concentrations in calcareous watersheds: Are they linked, and is there an upper limit toalkalinity?
Beat Müller, Joseph S. Meyer, and René Gächter Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-461,https://doi.org/10.5194/bg-2018-461,2018
Preprint withdrawn (discussion: closed, 5 comments) Short summaryShort summary
Data from aquifers, rivers and lakes in calcareous watersheds in Switzerland display a distinct correlation between alkalinity and nitrate concentrations. Analysis of long-term datasets suggests that this close positive relationship is a result of three processes: (i) mineralization of organic fertilizer, (ii) exchange of acid or base ions during the uptake of ammonium or nitrate by crop plants, and (iii) carbon dioxide release by roots as a result of fertilizer-stimulated plant growth.Hide
02 Nov 2018 Evaluation of atmospheric nitrogen inputs into marine ecosystems of the North Sea and Baltic Sea – part B: contribution by shipping and agricultural emissions Daniel Neumann, Hagen Radtke, Matthias Karl, and Thomas Neumann Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-365,https://doi.org/10.5194/bg-2018-365,2018
Publication in BG not foreseen (discussion: closed, 8 comments) Shortsummary
Short summary
The contribution of atmospheric nitrogen deposition to the marine dissolved inorganic nitrogen (DIN) pool of the North and Baltic Sea was assessed for the year 2012. Atmospheric deposition accounted for approximately 10 % to 15 % of the DIN but its residence time differed between both water bodies. The nitrogen contributions of atmospheric shipping and agricultural imissions also were assessed. Particularly the latter source had a large impact in coastal regions.Hide
29 Oct 2018 Microbial Community Function in Electroactive Biofilm-based Constructed Wetlands Carlos A. Ramírez-Vargas, Carlos A. Arias, Liang Zhang, and Hans Brix Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-428,https://doi.org/10.5194/bg-2018-428,2018
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
This study focuses on the microbial characterization of Microbial Electrochemical-based Constructed Wetland (METland), with a method that evaluates the diversity of microbial communities based on carbon consumption. Two electro-conductive materials were tested. The systems showed differences in carbon consumption. Also, were established correlations between carbon use and removal of pollutants. The obtained results provide useful insight into the spatial dynamics ofMETland systems.
Hide
19 Oct 2018 The role of light as vital effect on coral skeleton oxygen isotopic ratio Anne Juillet-Leclerc Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-433,https://doi.org/10.5194/bg-2018-433,2018
Preprint withdrawn (discussion: closed, 3 comments) Short summaryShort summary
My manuscript is the result of a reflexion process about the meaning of coral skeleton tracers. I realized that in contrast to biologists, geochemists always neglect the light role on proxies. Light influence is difficult to separate from temperature. Thus, I used coral culture in controlled conditions. Once the process identified, I read differently the literature dedicated to the coral skeleton δ18 and found several evidences demonstrating that light could explain thevital effect.
Hide
16 Oct 2018 Surface transport of DOC acts as a trophic link among Mediterranean sub-basins Chiara Santinelli, Roberto Iacono, Ernesto Napolitano, and MaurizioRibera d'Alcalá
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-418,https://doi.org/10.5194/bg-2018-418,2018
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
Part of the energy in the ocean is stored as dissolved organic carbon. Water moves around, bringing this energy from one place to another, down to the deep layers and up again. Here, we show that horizontal currents can have a strong impact on the carbon cycle, because they can transport chemical energy far away, establishing links between distant areas of the ocean and feeding regions in which the local accumulation of chemical energy is low.Hide
15 Oct 2018 Assessment of paleo-ocean pH records from boron isotope ratio in the Pacific and Atlantic ocean corals: Role of anthropogenic CO2 forcing and oceanographic factors to pH variability Mohd Tarique and Waliur Rahaman Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-438,https://doi.org/10.5194/bg-2018-438,2018
Preprint withdrawn (discussion: closed, 3 comments) 12 Oct 2018 Seasonal Net Ecosystem Metabolism of the Near-Shore Reef System in La Parguera, Puerto Rico Melissa Meléndez, Joseph Salisbury, Dwight Gledhill, Chris Langdon, Julio M. Morell, Derek Manzello, Sylvia Musielewicz, and AdrienneSutton
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-408,https://doi.org/10.5194/bg-2018-408,2018
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
Using observations from the NOAA CO2 buoy in La Parguera, Puerto Rico along with modeling approaches yield useful indices of biological processes affecting the water column over the reef. This study provided the first long-term monitoring of coral reef biological processes. Results show that processes that produce CO2 dominated over most of the year leading to high dissolution rates. This can have implications on the reef system's ability to recover to other climate-scale stressors (warming).Hide
12 Oct 2018 Evaluation of atmospheric nitrogen inputs into marine ecosystems of the North Sea and Baltic Sea – part A: validation and time scales of nutrient accumulation Daniel Neumann, Matthias Karl, Hagen Radtke, and Thomas Neumann Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-364,https://doi.org/10.5194/bg-2018-364,2018
Manuscript not accepted for further review (discussion: closed, 9 comments) Short summaryShort summary
Atmospheric nitrogen deposition contributes 20 % to 40 % to bioavailable nitrogen inputs into the North Sea and Baltic Sea. Excessive bioavailable nitrogen may lead to intensified algal blooms in these water bodies resulting in several negative consequences for the marine ecosystem. We traced atmospheric nitrogen in the marine ecosystem via an ecosystem model and estimated the contribution of atmospheric nitrogen to plankton biomass in different regions of the North and Baltic Sea over five years.Hide
21 Sep 2018 Phosphorus and carbon in soil particle size fractions –A global synthesis
Marie Spohn
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-404,https://doi.org/10.5194/bg-2018-404,2018
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
Phosphorus (P) supply for agriculture will likely decrease in the future. Therefore, it is important to understand the behavior of phosphorus in soils. The study shows that soil organic phosphorus concentrations depend on climate, and that organic P is more strongly enriched in the clay size fraction than organic carbon (C) and inorganic P. The strong sorption of organic P in soil, especially in the clay size fraction, makes organic P less vulnerable to land-use change than soil organic C.Hide
13 Sep 2018 Methane emissions from a sediment-deposited island in a Lancang-Mekong reservoir Wenqing Shi, Qiuwen Chen, Jianyun Zhang, Cheng Chen, Yuchen Chen, Yuyu Ji, Juhua Yu, and Bryce R. Van Dam Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-380,https://doi.org/10.5194/bg-2018-380,2018
Preprint withdrawn (discussion: closed, 7 comments) Short summaryShort summary
As the second most important greenhouse gas, the production of methane undermines the green credentials of hydropower. We investigated methane emissions from a reservoir island and discovered self-mitigation of methane emissions in a ring-like zone around the island edge. Understanding the self-mitigation of methane emissions in dammed rivers will help to screen effective strategies for lessening the global warming effects of hydropower systems.Hide
04 Sep 2018 The Coupling of Carbon, Nitrogen and Sulphur Transformational Processes in River Sediments Based on Correlationship among the Functional Genes Mingzhu Zhang, Yang Li, Qingye Sun, Piaoxue Chen, and Xuhao Wei Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-369,https://doi.org/10.5194/bg-2018-369,2018
Preprint withdrawn (discussion: closed, 2 comments) Short summaryShort summary
(1) Correlation among functional genes could speculate the coupledsystems of C-N-S.
(2) The amoA-AOA and dsrB played a secondary role in the systems. (3) Functional genes (aprA, mcrA and hzo) counted for much in thesystems.
(4) C and N showed combined effects in the coupling transformation.Hide
27 Aug 2018 Spatial pattern of Kd(PAR) and its relationship with light absorption of optically active components in inland watersacross China
Zhidan Wen, Kaishan Song, Chong Fang, Qian Yang, Ge Liu, Yingxin Shang, and Xiaodi Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-348,https://doi.org/10.5194/bg-2018-348,2018
Preprint withdrawn (discussion: closed, 8 comments) Short summaryShort summary
The spatial distribution of the attenuation of photosynthetic active radiation (Kd(PAR)) was routinely estimated in China lakes and reservoirs. The light absorption coefficient of OACs could explain 70 %–87 % of Kd(PAR) variations. Kd(PAR) could be predicted from aOACs values in the inland waters. Besides, results of this study are suggesting that new studies on the variability of Kd(PAR) in inland waters must consider the hydrodynamic conditions, trophic status and OACs within the water column.Hide
24 Aug 2018 Investigation of scale interaction between rainfall and ecosystem carbon exchange ofWestern Himalayan Pine dominatedvegetation
Sandipan Mukherjee, K Chandra Sekar, Priyanka Lohani, Kireet Kumar, Prabir Patra, and Kentaro Ishijima Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-299,https://doi.org/10.5194/bg-2018-299,2018
Preprint withdrawn (discussion: closed, 6 comments) 21 Aug 2018 Characterization of chromophoric dissolved organic matter in lakes on the Tibet Plateau, China, using spectroscopic analysis Kaishan Song, Sijia Li, Zhidan Wen, Lili Lyu, and Yingxin Shang Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-259,https://doi.org/10.5194/bg-2018-259,2018
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Inland lakes are a direct link among the land, atmospheric and oceans (via rivers). Little is currently known about colored dissolved organic matter and its relationship with water quality in lakes across the Tibet Plateau. For these brackish and saline lakes, a high salt content with accumulation of carbon and low organic colored dissolved matter in brackish lakes, indicating the influence of strong evapoconcentration, intense ultraviolet irradiance and landscapes.Hide
20 Aug 2018 High Riverine CO2 Outgassing affected by Land Cover Types in the Yellow River Source Region Mingyang Tian, Xiankun Yang, Lishan Ran, Yuanrong Su, Lingyu Li, Ruihong Yu, Haizhu Hu, and Xi Xi Lu Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-292,https://doi.org/10.5194/bg-2018-292,2018
Preprint withdrawn (discussion: closed, 8 comments) Short summaryShort summary
We investigated the spatial and temporal variability of riverine CO2 outgassing characteristics of the Yellow River source region. Riverine CO2 emission were in situ monitored under different land cover types (i.e., glacier, permafrost, wetland, and grassland) in the research area.This study will lead to a better understanding of riverine carbon export, especially for alpine rivers, which will help refine the global estimation of global GHG gas emission.Hide
02 Aug 2018 Unveiling the Perth Canyon and its deep-water faunas Julie A. Trotter, Charitha Pattiaratchi, Paolo Montagna, Marco Taviani, James Falter, Ron Thresher, Andrew Hosie, David Haig, Federica Foglini, Quan Hua, and Malcolm T. McCulloch Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-319,https://doi.org/10.5194/bg-2018-319,2018
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
The first ROV exploration of the Perth Canyon offshore southwest Australia discovered diverse hot spots of deep-sea biota to depths of ~ 2000 m. Some corals were living below the carbonate saturation horizon. Extensive coral graveyards found at ~ 700 and ~ 1700 m are between ~ 18 000 and ~ 30 000 years old, indicating these corals flourished during the last ice age. Anthropogenic carbon detected within the upper ~ 800 m highlights the increasing threat of climate change to deep-sea ecosystems.Hide
02 Aug 2018 Potential effects of deep seawater discharge by an Ocean Thermal Energy Conversion plant on the marine microorganisms inoligotrophic waters
Mélanie Giraud, Véronique Garçon, Denis De La Broise, Stéphane L'Helguen, Joël Sudre, and Marie Boye Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-306,https://doi.org/10.5194/bg-2018-306,2018
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
Associated to transitional blue energies, first investigation of the environmental impact on the marine microorganisms of an Ocean Thermal Energy Conversion (OTEC) pilot plant before its installation, using numerical simulation and in situ experimentations. No environmental standards are available yet. Microbiodiversity can be impacted in one scenario of the OTEC functioning. Give the basis for anticipating the long-term effects of renewable marine thermal energies on theenvironment.
Hide
23 Jul 2018 Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary Neil K. Ganju, Jeremy M. Testa, Steven E. Suttles, and Alfredo L.Aretxabaleta
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-335,https://doi.org/10.5194/bg-2018-335,2018
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Estuaries are productive ecosystems that provide habitat for flora and fauna. We measured changes in light and oxygen, along with variables such as tides and waves, to understand how productivity in the estuary changed over daily and seasonal time periods. We found large differences in productivity between channels and seagrass beds, as well as a link between light climate and productivity. This study will help us understand how estuaries will respond to future changesin conditions.
Hide
18 Jul 2018 The importance of tree demography and root water uptake for modelling the carbon and water cycles of Amazonia Emilie Joetzjer, Fabienne Maignan, Jérôme Chave, Daniel Goll, Ben Poulter, Jonathan Barichivich, Isabelle Maréchaux, Sebastiaan Luyssaert, Matthieu Guimberteau, Kim Naudts, Damien Bonal, andPhilippe Ciais
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-308,https://doi.org/10.5194/bg-2018-308,2018
Revised manuscript not accepted (discussion: closed, 8 comments) Shortsummary
Short summary
This study explores the relative contributions of tree demographic, canopy structure and hydraulic processes on the Amazonian carbon and water cycles using large-scale process-based model. Our results imply that explicit coupling of the water and carbon cycles improves the representation of biogeochemical cycles and their spatial variability. Representing the variation in the ecological functioning of Amazonia should be the next step to improve the performance and predictiveability of models.
Hide
12 Jul 2018 Influence of concurrence of extreme drought and heat events on carbon and energy fluxes in dominant ecosystems in the Pacific Northwest region Hyojung Kwon, Whitney Creason, Beverly E. Law, Christopher J. Still,and Chad Hanson
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-297,https://doi.org/10.5194/bg-2018-297,2018
Preprint retracted (discussion: closed, 1 comment) Short summaryShort summary
Ecosystem responses to short-term extreme climate were diverse and non-linear due to the interactive effects of physiological and environmental factors even within the same plant functional types and species in the Pacific Northwest. A negative (reducing) effect of the short-term extreme climate on seasonal carbon uptake was observed. Douglas-fir is likely to experience more constraints on carbon uptake than ponderosa pine if hot/dry season intensifies in the PacificNorthwest.
Hide
06 Jul 2018 Spring phenology and phenology-climate links inferred from two remotely sensed vegetation indices across regions and biomes Xiyan Xu, William J. Riley, Charles D. Koven, and Gensuo Jia Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-257,https://doi.org/10.5194/bg-2018-257,2018
Preprint withdrawn (discussion: closed, 7 comments) 05 Jul 2018 A mechanistic model for electrical conduction in soil–root continuum: a virtual rhizotron study Sathyanarayan Rao, Félicien Meunier, Solomon Ehosioke, Nolwenn Lesparre, Andreas Kemna, Frédéric Nguyen, Sarah Garré, and MathieuJavaux
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-280,https://doi.org/10.5194/bg-2018-280,2018
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
This paper illustrates the impact of electrical property of maize root segments on the Electrical Resistivity Tomography (ERT) inversion results with the help of numerical model. The model includes explicit root representation in the finite element mesh with root growth, transpiration and root water uptake. We show that, ignoring root segments could lead to wrong estimation of water content using ERTmethod.
Hide
21 Jun 2018 Estimating global gross primary productivity using chlorophyll fluorescence and a data assimilation system with theBETHY-SCOPE model
Alexander J. Norton, Peter J. Rayner, Ernest N. Koffi, Marko Scholze, Jeremy D. Silver, and Ying-Ping Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-270,https://doi.org/10.5194/bg-2018-270,2018
Revised manuscript has not been submitted (discussion: closed, 2 comments) Short summaryShort summary
This study presents a global estimate of land carbon uptake through photosynthesis. We make use satellite chlorophyll fluorescence measurements, a visible indicator of photosynthesis, to optimize model parameters and then use the optimized model to estimate photosynthetic carbon uptake. This provides a new tool that can combine measurements and observations in a systematic way and maximise the use of chlorophyll fluorescence to improve our understanding of the landcarbon cycle.
Hide
18 Jun 2018 Impact of the 2011 off the Pacific coast of Tohoku earthquake on a deep-sea benthic ecosystem: evidence from living and dead benthic foraminifera on the landward slope of the Japan Trench Akira Tsujimoto, Ritsuo Nomura, Hidetaka Nomaki, Kazuno Arai, Mutsuo Inoue, and Katsunori Fujikura Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-237,https://doi.org/10.5194/bg-2018-237,2018
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
We examined the impact of the earthquake and tsunami following the 2011 off the Pacific coast of Tohoku earthquake on the deep-sea benthic ecosystems. The episodic deposition of sediments resulting from the earthquake caused a drastic decrease in the original benthic foraminifera and colonization of opportunistic species with a low diversity within 17 months.Hide
14 Jun 2018 Reviews and syntheses: Processes and functional genes involved in nitrogen cycling in marine environments Ramiro Ramos and Silvia Pajares Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-279,https://doi.org/10.5194/bg-2018-279,2018
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
The nitrogen cycle maintains the functioning of marine ecosystems and will be a crucial component in how the ocean responds to global environmental change. In this review, we summarize the current understanding of the marine microbial nitrogen cycle, its underlying biochemical and enzymatic reactions, the ecology and distribution of participating microorganisms in different marine ecosystems, and the main impacts of anthropogenic activities on the marine N cycle.Hide
07 Jun 2018 Changes in carbon stocks of _Fagus_ forest ecosystems along an altitudinal gradient on Mt. Fanjingshan in Southwest China Qiong Cai, Chengjun Ji, Xuli Zhou, Wenjing Fang, Tianli Zheng, Jiangling Zhu, Lei Shi, Haibo Li, Jianxiao Zhu, and Jingyun Fang Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-242,https://doi.org/10.5194/bg-2018-242,2018
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
Quantifying different carbon (C) pools in forest ecosystems is important in understanding C cycling in forests. However, the C pools of Chinese beech (Fagus) forests have seldom been studied. Here, the altitudinal patterns of four C pools in beech forests in Southwest China were investigated, and the stand age was proved to be a key factor shaping such patterns. Thus, this study provides data for understanding Chinese beech forests and stresses the importance of stand age in C accumulation.Hide
28 May 2018 Dynamic interactions between iron and sulfur cycles from Arctic methane seeps Pauline Latour, Wei-Li Hong, Simone Sauer, Arunima Sen, William P. Gilhooly III, Aivo Lepland, and Fotios Fouskas Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-223,https://doi.org/10.5194/bg-2018-223,2018
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Dissolved iron is one of the most important nutrients for the marine life. The production and consumption of dissolved iron are therefore closely associated with the carbon cycling in the ocean. We present geochemical data and numerical modeling results to discuss how the supply of dissolved iron, from marine sediments to the ocean, is connected to carbon and sulfur cycles and influence the distribution of animals in environments with high methane supply.Hide
07 May 2018 Ammonia impacts methane oxidation and methanotrophic community in freshwater sediment Yuyin Yang, Jianfei Chen, Shuguang Xie, and Yong Liu Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-193,https://doi.org/10.5194/bg-2018-193,2018
Preprint withdrawn (discussion: closed, 5 comments) 03 May 2018 Seasonal and spatial variability of methane emissions from a subtropical reservoir in Eastern China Le Yang, Hepeng Li, Chunlei Yue, and Jun Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-195,https://doi.org/10.5194/bg-2018-195,2018
Manuscript not accepted for further review (discussion: closed, 4comments)
27 Apr 2018 Ecosystem respiration in coastal tidal flats can be modelled from air temperature, plant biomass and inundation regime Xueyang Yu, Siyuan Ye, Linda Olsson, Mengjie Wei, Ken W. Krauss, andHans Brix
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-186,https://doi.org/10.5194/bg-2018-186,2018
Preprint retracted (discussion: closed, 4 comments) Short summaryShort summary
Partition ecosystem respiration of a _Suaeda salsa_ wetland into plant and soil derived efflux according to in-situ observations. Quantify the interactive influence of air temperatre, biomass and water regime. Develop a rapid assessment method which could be potentially used to project regional gaseous carbon loss from coastal _Suaeda salsa_ wetlands.Hide
27 Apr 2018 The response of seagrass (_Posidonia oceanica_) meadow metabolism to CO2 levels and hydrodynamic exchange determined with aquatic eddy covariance Dirk Koopmans, Moritz Holtappels, Arjun Chennu, Miriam Weber, and Dirkde Beer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-199,https://doi.org/10.5194/bg-2018-199,2018
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Over the next century the dissolved carbon dioxide gas and hydrogen ion concentrations in seawater will triple. We used a new technique that incorporates the net productivity of all organisms in a ten square meter area to examine what the future of seagrass might look like. We compared seagrass at a CO2 vent to seagrass at a conventional shore. Seagrass meadow productivity was reduced at the vent, but it is likely that contaminants in vent fluids may have been the cause.Hide
26 Apr 2018 Carbon Stocks and Accumulation Rates in Salt Marshes of the Pacific Coast of Canada Stephen G. Chastain, Karen Kohfeld, and Marlow G. Pellatt Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-166,https://doi.org/10.5194/bg-2018-166,2018
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
We generated estimates of carbon stocks and accumulation rates in soils of salt marshes from Clayoquot Sound on the west coast of Canada. Following established methodologies, we sampled seven sites to generate a regional average estimate and compared it with global marsh carbon data. Our results show the marshes as highly efficient carbon accumulation hotspots, comparable with those from elsewhere on the NE Pacific coast or similar latitude ranges.Hide
26 Apr 2018 Phylogeny of the Stipa and implications for grassland evolution in China: based on biogeographic evidence Qing Zhang, Junjun Chen, and Yong Ding Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-140,https://doi.org/10.5194/bg-2018-140,2018
Revised manuscript not accepted (discussion: closed, 6 comments) 20 Apr 2018 Calibrating a process-based forest model with a rich observational dataset at 22 European forest sites David Cameron, Christophe Flechard, and Marcel Van Oijen Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-156,https://doi.org/10.5194/bg-2018-156,2018
Revised manuscript not accepted (discussion: closed, 7 comments) 06 Apr 2018 Minimum temperature and precipitation determine fish richness pattern in China's nature reserves Wende Chen, Shengbin Chen, Mengwei Shen, Lingfeng Mao, Peihao Peng, Juan Wang, Dan Zhao, and Yuelin Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-389,https://doi.org/10.5194/bg-2017-389,2018
Revised manuscript has not been submitted (discussion: closed, 3comments)
03 Apr 2018 Higher response of terrestrial plant growth to ammonium than nitrate addition Liming Yan, Xiaoni Xu, and Jianyang Xia Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-124,https://doi.org/10.5194/bg-2018-124,2018
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
The patterns of the ratio of atmospheric deposited ammonium- to nitrate-N shows an increasing trend with the total N load since the industrial revolution. As a key role of N in plant growth, it is important to know the general response patterns of plant growth to N forms. By the synthesized dataset and meta-analysis, we found a higher response of plant growth to NH4+-N than NO3−-N addition across all species. Our results suggest plant could more positively respond to N deposition in the future.Hide
28 Mar 2018 Impacts of Nitrogen Addition on Nitrous Oxide Emission: Model-Data Comparison Yujin Zhang, Minna Ma, Huajun Fang, Dahe Qin, Shulan Cheng, andWenping Yuan
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-126,https://doi.org/10.5194/bg-2018-126,2018
Revised manuscript has not been submitted (discussion: closed, 3 comments) Short summaryShort summary
The study aims to examine the performance of six widely–used N2O models under different levels of atmospheric N deposition in a subtropical forest receiving the highest N deposition. The performances are determined by the model structures and algorithms. The study highlights the need to improve representation of N2O production and diffusion processes, and the key control of soil water-filled pore. The results have significant implications for the improvement and future development of N2O model.Hide
19 Mar 2018 Lability of natural organic matter in freshwater: a simple method for detection using hydrogen peroxide as an indicator Isabela Carreira Constantino, Amanda Maria Tadini, Marcelo Freitas Lima, Lídia Maria de Almeida Plicas, Altair Benedito Moreira, and Márcia Cristina Bisinoti Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-122,https://doi.org/10.5194/bg-2018-122,2018
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
The lability or recalcitrance of natural organic matter is key characteristic in dynamic of others entities present in aquatic systems, but there was not yet a direct method to quantification of labile (LOM) and recalcitrant (ROM) organic matter. The method proposed to quantify and ROM concentrations was developed using the hydrogen peroxide kinetic in freshwater samples. This method was employed in freshwater samples for one year and the results were related with seasonality.Hide
16 Mar 2018 Global patterns of leaf nutrient resorption in herbaceousplants
Zhiqiang Wang, Zhexuan Fan, Qi Zhao, Jinzhi Ran, and Karl J. Niklas Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-112,https://doi.org/10.5194/bg-2018-112,2018
Manuscript not accepted for further review (discussion: closed, 6comments)
13 Mar 2018 Inferring particle dynamics in the Mediterranean Sea from in-situ pump POC and chloropigment data using Bayesian statistics Weilei Wang, Cindy Lee, and Francois Primeau Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-6,https://doi.org/10.5194/bg-2018-6,2018
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
We introduce a new model that can infer particle dynamics rate constants using large volume pump chloropigment data. We compare the inferred rate constants to those estimated using the same tracers but collected using sinking velocity (SV) sediment traps, and to those estimated using SV trap thorium data. We conclude that the two different sampling methods have less influence on particle aggregation and disaggregation rate constant estimations than do the two differenttracers themselves.
Hide
27 Feb 2018 Comparative analysis of trade-offs and synergies in ecosystem services between Guanzhong Basin and Hanzhong Basin in China Bo-Yan Li, Wei Wang, and Yun-Chen Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-33,https://doi.org/10.5194/bg-2018-33,2018
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
1.Comparative analysis was used to study the ES interactions in two basins at a fine spatio-temporal scale. 2.The trade-off relationships between FP and NPP were the most significant in both basins. 3.The synergistic relationships between WR and NPP, as well as between WR and SC weakened in the two basins over 20 years. 4.The synergies and trade-offs between the ES were widespread in the two basins, rather than pure trade-offs or synergies.Hide
15 Feb 2018 Quantification of the fine-scale distribution of Mn-nodules: insights from AUV multi-beam and optical imagery datafusion
Evangelos Alevizos, Timm Schoening, Kevin Koeser, Mirjam Snellen, andJens Greinert
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-60,https://doi.org/10.5194/bg-2018-60,2018
Revised manuscript has not been submitted (discussion: closed, 4 comments) Short summaryShort summary
AUV hydro-acoustic and optical data enhance high resolution quantitative mapping of deep sea hard substrates such Mn-nodules. Machine learning algorithms predict with good accuracy the Mn-nodules abundances over large scale areas utilizing one third of ground truth optical data. Accurate maps of Mn-nodule abundances raise new questions about the role of fine scale geomorphology in nodule formation, provide new insights in deep sea ecological studies, and improve mineral assessment estimations.Hide
13 Feb 2018 Microbial Community Structure and Activity Changes in Response to the Development of Hypoxia in a Shallow Estuary Yunjung Park, Sujin Kim, Soonja Cho, Jaeho Cha, and Soonmo An Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-64,https://doi.org/10.5194/bg-2018-64,2018
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Our work addresses the influences of hypoxia on microbes in three independent aspects (activity, abundance and community structure). The activity and community structure in water column were less affected compared to the sediment (an interesting SRB (sulphate reducing bacteria) succession happened in sediment). Our results also illustrated that the intriguing N dynamics recently discovered in the OMZ (such as AOA dynamics) might also be important in the hypoxiczone.
Hide
05 Feb 2018 Regulation of N2O emissions from acid organic soil drained for agriculture: Effects of land use and season Arezoo Taghizadeh-Toosi, Lars Elsgaard, Tim Clough, Rodrigo Labouriau, and Søren Ole Petersen Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-9,https://doi.org/10.5194/bg-2018-9,2018
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Organic soils are extensively under agricultural management which lead to high emissions of N2O. We searched for relationships between seasonal variation in N2O emissions and potential driving variables such as temperature, precipitation, water table depth, N availability, and possible decomposibility of peat. Reducing surplus N in the soil, for example by use of a plant cover, and stabilisation of water table depth during the year, appear to be keys to controlling N2O emissions.Hide
05 Feb 2018 Alaskan Stream flow in the eastern subarctic Pacific and the eastern Bering Sea and its impact on biological productivity Sergey Prants, Andrey Andreev, Michael Uleysky, and Maxim Budyansky Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-477,https://doi.org/10.5194/bg-2017-477,2018
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
We demonstrate the transport pathways of Alaskan Stream water in the eastern subarctic Pacific and the eastern Bering Sea from October 1, 1994 to September 12, 2016 with the help of altimetry-based Lagrangian maps. A mesoscale eddy activity in the Alaskan Stream region and the eastern Bering Sea is shown to be relatedwith the wind stress curl in winter. The mesoscale dynamics may determine not only lower-trophic-level organism biomass but also salmon abundance/catchin the study area.
Hide
01 Feb 2018 Boreal forest soil is a significant and diverse source of volatile organic compounds Mari Mäki, Hermanni Aaltonen, Jussi Heinonsalo, Heidi Hellén, Jukka Pumpanen, and Jaana Bäck Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-22,https://doi.org/10.5194/bg-2018-22,2018
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
Vegetation emissions of volatile organic compounds (VOCs) are intensively studied world-wide, but remains largely unknown how effectively belowground VOCs are produced and released into the atmosphere. We demonstrate that boreal forest soil is a diverse source and storage of VOCs, because more than 50 VOCs were detected in the soil air. Our results give evidence that VOC production processes and storages partly differ from those VOCs that are simultaneously emitted from the soil surface.Hide
30 Jan 2018 Carbonyl sulfide (OCS) exchange between soils and the atmosphere affected by soil moisture and compensation points Rüdiger Bunk, Zhigang Yi, Thomas Behrendt, Dianming Wu, Meinrat Otto Andreae, and Jürgen Kesselmeier Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-20,https://doi.org/10.5194/bg-2018-20,2018
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
We examined the OCS exchange of four soils with the atmosphere. The laboratory setup used allowed to monitor this exchange while simultaneously monitor soil moisture. The OCS exchange of those soils was measured over full range from very wet to very dry. We found that uptake of OCS is highly dependent on soil moisture, that probably heterotroph and autotrophs drive the uptake at different soil moistures and that the role of soils as net consumer or producers of OCS may vary with soil moisture.Hide
23 Jan 2018 Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific Alain Fumenia, Thierry Moutin, Sophie Bonnet, Mar Benavides, Anne Petrenko, Sandra Helias Nunige, and Christophe Maes Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-557,https://doi.org/10.5194/bg-2017-557,2018
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
The Melanesian archipelago waters between 160° E and 170° W are characterized by a significant N2 fixation rates and an excess of particulate organic nitrogen compared to the canonical ratio of Redfield and a positive N*. We hypothesize that the southern branch of the subtropical gyre is probably the main vector of excess nitrogen transport in the thermocline waters showing an influence of nitrogen fixation occurring in the western tropical in a large part of theSouth Pacific.
Hide
23 Jan 2018 Modeling transient soil moisture limitations on microbialcarbon respiration
Yuchen Liu, Matthew J. Winnick, Hsiao-Tieh Hsu, Corey R. Lawrence, Kate Maher, and Jennifer L. Druhan Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-10,https://doi.org/10.5194/bg-2018-10,2018
Preprint withdrawn (discussion: closed, 6 comments) Short summaryShort summary
Microbes naturally occur in soils and respire CO2, thus constituting a significant source of atmospheric greenhouse gases. We seek to improve predictions for the amount of CO2 emitted from soil by contrasting two models compared against lab measured respiration rates using natural soil samples at a range of soil moistures. Results show that a simplified model is more suitable for interpreting soil respiration rates below 100 cm, while a more complex approach is necessary for shallower depths.Hide
22 Jan 2018 Functional spatial contextualisation of the effects of multiple stressors in marine bivalves Antonio Giacoletti and Gianluca Sar Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-13,https://doi.org/10.5194/bg-2018-13,2018
Preprint retracted (discussion: closed, 5 comments) Short summaryShort summary
The manuscript integrates experimental investigation of multiple stressors effects' on bivalves with model simulations aimed to predict future potential effects on Life-History traits. Our model species has been projected into a future climate change scenario, crossed with a lower pH and hypoxia events. This study mechanistically quantify the major threat represented by hypercapnia and hypoxia phenomena for the growth, reproduction and fitness of mussels under current climatechange context.
Hide
22 Jan 2018 Role of _Calanus sinicus_ (Copepoda, Calanoida) on dimethylsulfide production in Jiaozhou Bay Juan Yu, Jiyuan Tian, Zhengyu Zhang, Guipeng Yang, and Hongju Chen Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-568,https://doi.org/10.5194/bg-2017-568,2018
Preprint retracted (discussion: closed, 5 comments) Short summaryShort summary
Data from the field experiment showed that _Calanus sinicus_ was the predominant copepod in Jiaozhou Bay and has no apparent effect on DMS/DMSP production. The results in the laboratory experiment showed that the effects of _C. sinicus_ grazing on DMS/DMSP production differed depending on the food type, food concentration and salinity. The data presented in this study are helpful to evaluate the copepod role on the biogeochemical cycle of DMSP in Jiaozhou Bay.Hide
16 Jan 2018 Interactive effects of seawater carbonate chemistry, light intensity and nutrient availability on physiology and calcification of the coccolithophore _Emiliania huxleyi_ Yong Zhang, Feixue Fu, David A. Hutchins, and Kunshan Gao Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-11,https://doi.org/10.5194/bg-2018-11,2018
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
To investigate responses of the calcifying _E. huxleyi_ to multiple environmental factors, we investigated its growth, POC and PIC quotas and photosynthesis parameter at different levels of CO2, light, dissolved inorganic nitrogen and phosphate concentrations. High CO2 (HC) and low nitrogen (LN) synergistically decreased growth rates, high light compensated for inhibition of low phosphate (LP) on growth rates at LC, but exacerbated inhibition of LP at HC. LN or LP increased PIC quotas and ETRmax.Hide
16 Jan 2018 Spatial estimation of soil carbon, nitrogen and phosphorus stoichiometry in complex terrains: a case study of Schrenk's spruce forest in the Tianshan Mountains Zhonglin Xu, Yapeng Chang, Lu Li, Qinghui Luo, Zeyuan Xu, Xiaofei Li, Xuewei Qiao, Xinyi Xu, Xinni Song, and Yao Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-536,https://doi.org/10.5194/bg-2017-536,2018
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Spatial distribution of ecological stochiometry is useful for studies corresponding to nutrient limitations, community dynamics, nutrient use efficiency and biogeochemical cycles. We syctematically sampled the soils in Schrenk's spruce forest and modeled the spatial distribution of C : N : P ratios in the forest. we found that multipel linear regression models could be reliably used to model the spatial patterns of soil elemental concentrations and stoichiometric ratios in mountainous terrain.Hide
12 Jan 2018 Winter mixing, mesoscale eddies and eastern boundary current: Engines for biogeochemical variability of the central Red Sea during winter/early spring period Nikolaos D. Zarokanellos and Burton H. Jones Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-544,https://doi.org/10.5194/bg-2017-544,2018
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
This is the first in-situ study that describes the temporal-spatial variability in the Red Sea during the winter/spring transition. In situ oceanographic glider data and remotely sensed chlorophyll are used to demonstrate how physical processes control biogeochemical variability in the central Red Sea. We believe that continuing to study these processes in the globally extreme Red Sea will help us to better understand the climate effects.Hide
11 Jan 2018 Plants in movement – Floristic and climatic characterization of the New Jersey hinterland during the Palaeogene–Neogene transition in relation to major glaciation events Sabine Prader, Ulrich Kotthoff, Francine M.G. McCarthy, Gerhard Schmiedl, Timme H. Donders, and David R. Greenwood Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-511,https://doi.org/10.5194/bg-2017-511,2018
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
The observed palaeovegetation movement signals probably correspond to several glacial phases of the middle Oligocene and Early Miocene and might be best reflected within peaks of the conifer forests. Glacial phases exposed shallow shelf areas and allowed the spreading of substrate-depending forest formations. Temperature estimates revealing relative stable humid warm temperate conditions. A Sporadic occurred extinct taxon widens the understanding of its distribution pattern during the Cenozoic.Hide
10 Jan 2018 Seasonal dynamics and disturbance of phytoplankton biomass in the wake of Tahiti as observed by Biogeochemical-Argofloats
Raphaëlle Sauzède, Elodie Martinez, Orens Pasqueron de Fommervault, Antoine Poteau, Alexandre Mignot, Christophe Maes, Hervé Claustre, Julia Uitz, Keitapu Maamaatuaiahutapu, Martine Rodier, Catherine Schmechtig, and Victoire Laurent Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-541,https://doi.org/10.5194/bg-2017-541,2018
Revised manuscript not accepted (discussion: closed, 4 comments) 02 Jan 2018 Deriving Photosynthetically Active Radiation at ground level in cloud-free conditions from Copernicus Atmospheric Monitoring Service (CAMS) products William Wandji Nyamsi, Phillipe Blanc, John A. Augustine, Antti Arola,and Lucien Wald
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-512,https://doi.org/10.5194/bg-2017-512,2018
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
This paper proposes a new, fast and accurate method for estimating photosynthetically active radiation at ground level in cloud-free conditions at any place and time. The method performs very well with the Copernicus Atmosphere Monitoring Service products as inputs describing the state of the atmosphere. An accuracy that is close to the uncertainty of the measurements themselves is reached. We believe that our research will be widely used in the near future.Hide
18 Dec 2017 Physical and chemical evolution of dissolved organic matter across the ablation season on a glacier in the central TibetanPlateau
Lin Feng, Yanqing An, Jianzhong Xu, Shichang Kang, Xiaofei Li, Yongqiang Zhou, Yunlin Zhang, Bin Jiang, and Yuhong Liao Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-507,https://doi.org/10.5194/bg-2017-507,2017
Revised manuscript not accepted (discussion: closed, 6 comments) 14 Dec 2017 A new procedure for processing eddy-covariance data to better quantify atmosphere-aquatic ecosystem CO2 exchanges Tatsuki Tokoro and Tomohiro Kuwae Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-499,https://doi.org/10.5194/bg-2017-499,2017
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
The eddy covariance (EC) method is the most promising approach for the measurement of atmospheric CO2 flux. However, the methods are currently in the development stage, and have large uncertainties. In this study, we improved the post-processing procedure for the EC method to reduce the uncertainty. The new processing method is expected to be useful in studies related to ecosystem-atmospheric CO2interactions.
Hide
30 Nov 2017 Atmospheric nitrogen deposition to terrestrial ecosystemsacross Germany
Martijn Schaap, Sabine Banzhaf, Thomas Scheuschner, Markus Geupel, Carlijn Hendriks, Richard Kranenburg, Hans-Dieter Nagel, Arjo J. Segers, Angela von Schlutow, Roy Wichink Kruit, and Peter J. H.Builtjes
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-491,https://doi.org/10.5194/bg-2017-491,2017
Revised manuscript has not been submitted (discussion: closed, 3 comments) Short summaryShort summary
Deposition of nitrogen and sulfur from the atmosphere on ecosystems causes a loss of biodiversity. We used a combination of atmospheric modelling and deposition observations to estimate the deposition to ecosystems across Germany. We estimate that 70 % of the ecosystems in Germany receive too much nitrogen from deposition. The results are used to determine whether economic activities causing nitrogen emissions are allowed in sensitive areas.Hide
30 Nov 2017 CO2 and CH4 budgets and global warming potential modifications in _Sphagnum_-dominated peat mesocosms invaded by_Molinia caerulea_
Fabien Leroy, Sébastien Gogo, Christophe Guimbaud, Léonard Bernard-Jannin, Xiaole Yin, Guillaume Belot, Wang Shuguang, and FatimaLaggoun-Défarge
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-423,https://doi.org/10.5194/bg-2017-423,2017
Revised manuscript has not been submitted (discussion: closed, 2comments)
27 Nov 2017 The importance of nitrogen fixation to a temperate, intertidal embayment determined using a stable isotope mass balanceapproach
Douglas G. Russell, Adam J. Kessler, Wei Wen Wong, and Perran L. M.Cook
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-418,https://doi.org/10.5194/bg-2017-418,2017
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
Using discrete measurements to investigate nitrogen cycling in marine environments can be problematic as such extrapolations mightn't accurately describe how nitrogen is processed over large spatial and temporal scales. The ability of a stable isotope and mass balance to overcome these issues was investigated, with results being compared to actual sedimentary nitrogen measurements. The closeness of the results suggested that the model developed accurately described the cycling ofnitrogen.
Hide
16 Nov 2017 Aerobiology and passive restoration of biological soilcrusts
Steven D. Warren, Larry L. St. Clair, and Steven D. Leavitt Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-430,https://doi.org/10.5194/bg-2017-430,2017
Revised manuscript has not been submitted (discussion: closed, 4 comments) Short summaryShort summary
Biological soil crusts (BSCs), common features of arid soils, are consortia of cyanobacteria, algae, fungi, lichens, and mosses. They control soil hydrology and stability, concentrate essential nutrients, and influence vascular plant survival. BSCs are easily disturbed and slow to recover. Mechanisms of recovery are poorly understood. From the field of aerobiology, we find that BSC organisms are carried airborne between areas, continents, and even hemispheres.Hide
13 Nov 2017 Lifestyle dependent occurrence of airborne fungi Daniel A. Pickersgill, Jörn Wehking, Hauke Paulsen, Eckhard Thines, Ulrich Pöschl, Janine Fröhlich-Nowoisky, and Viviane R. Després Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-452,https://doi.org/10.5194/bg-2017-452,2017
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
To investigate lifestyle dependent sporulation strategies of wind-dispersed fungi, species and genera identified in environmental air samples were grouped according to their lifestyles or ecological niches. Findings revealed unrecognized characteristic patterns in the seasonal occurrence and size distribution of fungal spores for different types of pathogenic and saprophytic fungi growing on herbaceous and woody plants.Hide
08 Nov 2017 Controls on spatial and temporal patterns of soil nitrogen availability in a High Arctic wetland Jacqueline K. Y. Hung, David M. Atkinson, and Neal A. Scott Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-440,https://doi.org/10.5194/bg-2017-440,2017
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
This paper presents findings that highlight the intricate relationships that exist between plant-available nutrients and carbon exchange in a High Arctic environment. The findings here suggest that finer scale processes altering nitrogen availability have influence on the overall carbon balance of wet sedge meadows in the High Arctic. Seasonal changes in nutrient availability is one key factor that regulates the magnitude and direction of responses to climate change.Hide
07 Nov 2017 Biogeochemical contrast between different latitudes and the effect of human activity on spatio-temporal carbon cycle change inAsian river systems
Tadanobu Nakayama
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-447,https://doi.org/10.5194/bg-2017-447,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
This paper intends to investigate the ability of an advanced eco-hydrologic and biogeochemical coupling model NICE-BGC to estimate diurnal and seasonal variations of carbon flux budgets between different latitudes from various watersheds. Result implies shift of importance of aquatic metabolism and terrestrially derived carbon between daytime and nighttime. The result also helps to contribute on the further improvement in biogeochemical cycle along terrestrial-aquatic continuum.Hide
02 Nov 2017 Effects of the interaction of ocean acidification, solar radiation, and warming on biogenic dimethylated sulfur compounds cycling in the Changjiang River Estuary Shan Jian, Jing Zhang, Hong-Hai Zhang, and Gui-Peng Yang Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-453,https://doi.org/10.5194/bg-2017-453,2017
Manuscript not accepted for further review (discussion: closed, 6comments)
01 Nov 2017 Historical record of the effects of anthropogenic pollution on benthic foraminifera over the last 110 years in GamakBay, South Korea
Da Un Jeong, Yeon Gyu Lee, Yong Wan Kim, Jung Jun Park, and Jung SickLee
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-383,https://doi.org/10.5194/bg-2017-383,2017
Manuscript not accepted for further review (discussion: closed, 3comments)
26 Oct 2017 CO2 Flux and its Relationship with Water Parameters and Biological Activity in the Ji-Paraná River (Rondônia State –Western Amazon)
Thandy Junio da Silva Pinto and Beatriz Machado Gomes Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-407,https://doi.org/10.5194/bg-2017-407,2017
Revised manuscript has not been submitted (discussion: closed, 2 comments) Short summaryShort summary
This study investigates the regulating mechanism for the CO2 exchange between air and water, and evidences that the biologic activity is an important regulating mechanism for the CO2 emission rate and the seasonal variation controls it. Most studies have considered the physical-chemical water parameters and atmospheric variation as a regulating mechanism in the gas exchange, however, we have concluded the biologic activity can be a driver for the regulation of carbon evasion in tropical rivers.Hide
23 Oct 2017 Variations in soil carbon, nitrogen, phosphorus and stoichiometry along forest succession in southern China Shuai Ouyang, Wenhua Xiang, Mengmeng Gou, Pifeng Lei, Liang Chen, Xiangwen Deng, and Zhonghui Zhao Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-408,https://doi.org/10.5194/bg-2017-408,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Our results showed that forest succession affected SOC, TN, and TP concentrations, storage and stoichiometry. SOC and TN exhibited a significant increasing tendency, while those of TP decreased significantly, indicating an increasing P limitation for plant growth as succession proceeded.Hide
23 Oct 2017 Dissolved organic matter release by phytoplankton in the context of the Dynamic Energy Budget theory Eleni Livanou, Anna Lagaria, Stella Psarra, and Konstadia Lika Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-426,https://doi.org/10.5194/bg-2017-426,2017
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
A model quantifying the two conceptual mechanisms of dissolved organic matter (DOM) release by phytoplankton, namely passive diffusion and active exudation, under different nutrient availability scenarios is proposed. The model resolves the relationship between primary production and DOM release, which depends on nutrient availability and predicts the production of DOM with different molecular and elemental ratio signatures, with potential implications for phytoplankton–bacteria relationships.Hide
12 Oct 2017 Causes of uncertainty in observed and projected heterotrophic respiration from Earth System Models Cary Lynch, Corinne Hartin, Min Chen, and Ben Bond-Lamberty Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-405,https://doi.org/10.5194/bg-2017-405,2017
Revised manuscript has not been submitted (discussion: closed, 8 comments) Short summaryShort summary
Heterotrophic respiration (RH) is a large part of the carbon cycle, but it is poorly simulated by climate models. We examine the relationships between RH and key climate variables to understand this uncertainty in observations and from climate models. Compared to observations, models overestimate both the RH trend and climatological relationships. In the future, the relationship between RH and temperature is strong and can be used to explore a wide range offuture scenarios.
Hide
29 Sep 2017 Diurnal, seasonal and long-term behaviour of high arctic tundra-heath ecosystem dynamics inferred from model ensembles constrained by time-integrated CO2 fluxes Wenxin Zhang, Per-Erik Jansson, and Bo Elberling Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-382,https://doi.org/10.5194/bg-2017-382,2017
Manuscript not accepted for further review (discussion: closed, 4comments)
25 Sep 2017 Disturbances of Biological Soil Crust by fossorial birds increase plant diversity in a Peruvian desert María Cristina Rengifo and Cesar Arana Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-376,https://doi.org/10.5194/bg-2017-376,2017
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
This article is one of the first involving biological soil crust (BSC) in Peru. Our study was located in a unique ecosystem in the Peruvian desert. Here we asked if the effects of birds disturbing the BSC had an effect on the vegetation. We analyze differences in soil moisture, nutrients, seed germination and seedling emergence. Our results revealed that soil moisture content and plant diversity was increased by disturbing the BSC, and remarks the importance of ecological interactions.Hide
22 Sep 2017 Ideas and perspectives: Can we use the soil carbon saturation deficit to quantitatively assess the soil carbon storage potential, or should we explore other strategies? Pierre Barré, Denis A. Angers, Isabelle Basile-Doelsch, Antonio Bispo, Lauric Cécillon, Claire Chenu, Tiphaine Chevallier, Delphine Derrien, Thomas K. Eglin, and Sylvain Pellerin Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-395,https://doi.org/10.5194/bg-2017-395,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Soil C storage is currently discussed at a high political level. This paper discusses whether the concept of soil C saturation deficit can be appropriate to determine quantitatively the soil C storage potential and contribute to answer operational questions raised by policy makers. After a review of the literature, we conclude that for practical and conceptual reasons, the C saturation deficit is not appropriate for assessing quantitatively the soil total OC storagepotential.
Hide
20 Sep 2017 On the potential causes of the recent Pelagic Sargassum blooms events in the tropical North Atlantic Ocean Sandrine Djakouré, Moacyr Araujo, Aubains Hounsou-Gbo, Carlos Noriega, and Bernard Bourlès Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-346,https://doi.org/10.5194/bg-2017-346,2017
Revised manuscript has not been submitted (discussion: closed, 4comments)
18 Sep 2017 Influence of Tidal Inundation on CO2 Exchange between Salt Marshes and the Atmosphere Hafsah Nahrawi, Monique Y. Leclerc, Gengsheng Zhang, and RoshaniPahari
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-356,https://doi.org/10.5194/bg-2017-356,2017
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
Salt marsh is one of the most productive system on Earth. To understand the salt marsh-atmosphere CO2 exchange, it is important to consider the effect of tidal inundation in this ecosystem. Eddy-covariance systems were used to capture CO2. Results showed that, CO2 exchange was reduced by 40 % during high tide events in August 2014, despite only 10 % of the events occurred in that month. The inclusion of such results has implications to quantify the carbon budget and its changes as sea level rises.Hide
14 Sep 2017 A mathematical representation of microalgae distribution in aridisol and water scarcity Abdolmajid Lababpour Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-359,https://doi.org/10.5194/bg-2017-359,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
A mathematical model was developed to support aridisol restoration processes. In the model, interaction of microalgae and soil water was formulated. Then, the model coupled partial differential equations were solved numerically. The model outputs reveal biomass distribution and water consumption in the horizontal surface. In addition, the model has ability to include effective factors such as light irradiation and weather temperature.Hide
13 Sep 2017 Intense _p_CO2 and Oscillations in a Mussel-Seagrass Habitat: Implications for Calcification Vincent Saderne, Peer Fietzek, Jens Daniel Müller, Arne Körtzinger, and Claas Hiebenthal Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-351,https://doi.org/10.5194/bg-2017-351,2017
Preprint withdrawn (discussion: closed, 2 comments) 28 Aug 2017 Organic and inorganic carbon and their stable isotopes in surface sediments of the Yellow River Estuary Zhitong Yu, Xiujun Wang, Guangxuan Han, Xingqi Liu, and Enlou Zhang Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-353,https://doi.org/10.5194/bg-2017-353,2017
Manuscript not accepted for further review (discussion: closed, 7comments)
25 Aug 2017 The Ballast Effect in the Indian Ocean Tim Rixen, Birgit Gaye, Kay-Christian Emeis, and VenkitasubramaniRamaswamy
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-317,https://doi.org/10.5194/bg-2017-317,2017
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
Sediment trap experiments showed that in the river-influenced regions of the Indian Ocean lithogenic matter supplied from land controls the organic carbon export into the deep sea via its ballast effect in sinking particles. Carbonate produced by plankton is the main ballast material in the open ocean. The ballast effect increases the CO2 uptake of the organic carbon pump by enhancing the amount of nutrients used to bind CO2 and by favouring the sedimentation of organic matter.Hide
25 Aug 2017 Comment on Growth responses of trees and understory plants to nitrogen fertilization in a subtropical forest in China byTian et al. (2017)
Taiki Mori
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-358,https://doi.org/10.5194/bg-2017-358,2017
Preprint withdrawn (discussion: closed, 3 comments) Short summaryShort summary
Negative effects of over-fertilization have been long reported in agricultural field. A recent paper by Tian et al. (2017) reported that application of NH4NO3 solution significantly reduced understory vegetation. In this note, I suggest the possibility that the negative effects were caused by the monthly application of NH4NO3 solution with high concentration (as high as 0.4 _M_ and 0.8 _M_).Hide
21 Aug 2017 A temperature threshold to identify the driving climate forces of the respiratory process in terrestrial ecosystems Zhiyuan Zhang, Renduo Zhang, Yang Zhou, Alessandro Cescatti, Georg Wohlfahrt, Minmin Sun, Juan Zhu, Vincenzo Magliulo, Feng Tao, andGuanhong Chen
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-345,https://doi.org/10.5194/bg-2017-345,2017
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
This study highlight the key role of temperature as main controlling factor of the maximum respiration rates in most terrestrial ecosystems, while other driving forces reduce the maximum respiration rates and temperature sensitivity of the respiratory process. These findings are particularly relevant under the current scenario of rapid global warming, given that the potential climate-induced changes in ecosystem respiration may lead to substantial anomalies in terrestrialcarbon budget.
Hide
08 Aug 2017 Impact of land use and soil properties on soil methane flux response to biochar addition Weiwei Cong, Jun Meng, and Samantha C. Ying Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-281,https://doi.org/10.5194/bg-2017-281,2017
Revised manuscript has not been submitted (discussion: closed, 8 comments) Short summaryShort summary
This paper examines the role of soil properties, biochar properties, and management factors in methane emission/uptake of biochar amended paddy and upland soils through the use of quantitative meta-analysis. Our findings show that variations in soil characteristics including SOC, C/N, and pH significantly influences the methane flux from biochar treated soils, while biochar characteristics and management practices have less to no effect as determined by the magnitude of theHedge's _d_ metric.
Hide
20 Jul 2017 Ideas and perspectives: New research examples of autumnal climate change ecology Ulf Büntgen and Paul J. Krusic Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-265,https://doi.org/10.5194/bg-2017-265,2017
Revised manuscript not accepted (discussion: closed, 3 comments) Shortsummary
Short summary
Changes in autumnal climate affecting the diversity and productivity of the ecosphere are arguably as important as vernal climatic changes. Here we present three examples of innovative, recent research in wildlife biology (big-game hunting), wood anatomy (tree-ring formation) and mycology (mushroom inventory), which refine our ability to better understand how varying environmental and climatic conditions impact the phenology, productiviy and diversity of different organismsin autumn.
Hide
17 Jul 2017 226Ra and 228Ra in the stratified estuary of the Krka River (Adriatic Sea, Croatia): implications for submarine groundwater discharge and its derived nutrients Jianan Liu, Jinzhou Du, Blaženka Gašparović, Milan Čanković, Enis Hrustić, Neven Cukrov, Zhuoyi Zhu, and Ruifeng Zhang Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-254,https://doi.org/10.5194/bg-2017-254,2017
Preprint retracted (discussion: closed, 4 comments) Short summaryShort summary
In this manuscript, we evaluated the submarine groundwater discharge (SGD) by three approaches and its derived nutrients in the highly stratified Krka River Estuary (KRE), Croatia based on radium isotopes. By establishing the water and nutrient budgets in the KRE surface layer, even if SGD accounted for a small portion of the total water input, nutrient fluxes through SGD were significant, especially the high N : P ratios in SGD have the notable potential to impact the ecosystem of the KRE.Hide
12 Jul 2017 Field-obtained carbon and nitrogen uptake rates of phytoplankton in the Laptev and East Siberian seas Sang Heon Lee, Jang Han Lee, Howon Lee, Jae Joong Kang, Jae Hyung Lee, Dabin Lee, SoHyun An, Dean A. Stockwell, and Terry E. Whitledge Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-234,https://doi.org/10.5194/bg-2017-234,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
The Laptev and East Siberian seas are highly dynamic in terms of active processing of organic matters impacting the transport to the deep Arctic Ocean. However, they have been the least biologically studied region in the Arctic Ocean. As a part of the NABOS program, our field-measured data, which are very scarce in this region, such as major inorganic nutrient and chl-a concentrations and carbon and nitrogen uptake rates of phytoplankton in this study will be very valuable for basic ground.Hide
10 Jul 2017 Potential Impact of Carbonate Chemistry Change (_p_CO2) on Krill and Krill-based Food chain in the Southern Ocean with emphasis on Embryogenesis of Antarctic krillRobert Y. George
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-207,https://doi.org/10.5194/bg-2017-207,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Our knowledge on the physiological responses of Antarctic krill Euphausia superba to increased _p_CO2 is meager. However, Saba et al. (2012) reported from experimental studies on E. superba that sufficiently elevated CO2 concentrations could alter internal acid base balance, compromising homeostatic regulation and disrupting internal systems ranging from oxygen transport to ion balance. Perturbation experiments with _E. superba_ under elevated CO2 (672 ppm) ingestion rates of krill averaged.Hide
07 Jul 2017 The contribution of land-use change versus climate variability to the 1940s CO2 plateau: Former Soviet Union as a testcase
Ana Bastos, Anna Peregon, Érico A. Gani, Sergey Khudyaev, Chao Yue, Wei Li, Célia Gouveia, and Philippe Ciais Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-267,https://doi.org/10.5194/bg-2017-267,2017
Revised manuscript not accepted (discussion: closed, 13 comments)Short summary
Short summary
The ice-core record indicates a stabilization of atmospheric CO2 in the 1940s, which is not captured by the state-of-the-art reconstructions of CO2 sources and sinks. The 1940s where marked by major socio-economic disruptions due to war. At the same time, very strong warming was registered in the high-latitudes. Here we evaluate the contributions of these two factors to a possible increase in the terrestrial sink not captured in other datasets, using the Former Soviet Union as a case study.Hide
04 Jul 2017 13C labelling study of constitutive and stress-induced terpenoide missions from Norway spruce and Scots pine Cheng Wu, Iida Pullinen, Stefanie Andres, Astrid Kiendler-Scharr, Einhard Kleist, Andreas Wahner, Jürgen Wildt, and Thomas F. Mentel Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-260,https://doi.org/10.5194/bg-2017-260,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Biogenic volatile organic compounds are important for atmospheric chemistry. We showed by 13CO2 labelling experiments that biosynthesis is not restricted to the presence of light. In particular sesquiterpenes exhibit substantial de novo emissions in darkness with the carbon being delivered from alternative carbon sources. Our findings are of importance for future emissions under conditions of climate change as the response of de novo emissions to stresses differs from that of pool emissions.Hide
03 Jul 2017 Winter phytoplankton blooms in the offshore south Adriatic waters (1995–2012) regulated by hydroclimatic events: Special emphasis on the exceptional bloom of 1995 Mirna Batistić, Damir Viličić, Vedrana Kovačević, Nenad Jasprica, Héloise Lavigne, Marina Carić, Rade Garić, and Ana Car Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-205,https://doi.org/10.5194/bg-2017-205,2017
Preprint retracted (discussion: closed, 8 comments) Short summaryShort summary
Contrary to earlier statements winter bloom is typical of the open South Adriatic. Its intensity depends on different water masses that enter the Adriatic, synergy of regional meteorology and mixing processes that affect these water masses. More intense blooms have occurred under certain hydroclimatic conditions: the East Mediterranean Transient (EMT), extreme winters, and reversal years that switch between anticyclonic and ciclonic circulation in theIonian Sea.
Hide
12 Jun 2017 Evidence for microbial mediated nitrate cycling within floodplain sediments during groundwater fluctuations Nicholas J. Bouskill, Mark E. Conrad, Markus Bill, Eoin L. Brodie, Yiwei Cheng, Chad Hobson, Matthew Forbes, Karen L. Casciotti, andKenneth H. Williams
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-212,https://doi.org/10.5194/bg-2017-212,2017
Preprint retracted (discussion: closed, 4 comments) Short summaryShort summary
This work couples isotope geochemical techniques with mechanistic microbial modeling in an attempt to further unravel the major factors responsible for an observed reduction in nitrate concomitant with a rising water table within floodplain sediments. We focus on 3 depths below ground surface with different periods of saturation and varying degrees of microbial nitrate loss. Using a microbial model we identify the controlling factors on denitrification responsible for thesedifferences.
Hide
09 Jun 2017 An Orphan Problem Looking for Adoption: Responding to Ocean Acidification Utilising Existing International Institutions Ellycia R. Harrould-Kolieb Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-230,https://doi.org/10.5194/bg-2017-230,2017
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
This research finds that there is a dearth of policy making pertaining to ocean acidification at the international level. Indeed, only three institutions are found to have initiated rue-making or implementation activities with the goal of either preventing worsening acidification or responding to its impacts. In light of this, this paper proposes that there are a variety of institutions that could be utilized to enhance the international response to ocean acidification.Hide
01 Jun 2017 Estimating total alkalinity for coastal ocean acidification monitoring at regional to continental scales in Australian coastal waters Kimberlee Baldry, Nick Hardman-Mountford, and Jim Greenwood Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-221,https://doi.org/10.5194/bg-2017-221,2017
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Total alkalinity (TA) is a measure of the oceans ability to resist changes in pH. In the face of ocean acidification, having the ability to predict the distribution of TA in coastal waters may provide insight into which regions might be prone to larger pH changes. Here we test a number of commonly used models for reconstructing TA. We find that within Australian coastal waters, using salinity alone is not the best choice in this region and that models are regionallydependent.
Hide
19 May 2017 Organic exudates promote Fe(II) oxidation in Fe limited cultures of _Trichodesmium erythraeum_ Hanieh T. Farid, Kai G. Schulz, and Andrew L. Rose Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-129,https://doi.org/10.5194/bg-2017-129,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
This study provides new insights into: (a) how organic exudates from a marine cyanobacterium may influence iron speciation and bioavailability in the extracellular milieu; and (b) approaches for evaluating rate constants for Fe(II) oxidation in the presence of unknown organic ligands. Given that microorganisms play critical roles in biochemical cycling of trace metals in water systems, the findings are expected to improve nutrient uptake models and be of interest to broad range of readers.Hide
16 May 2017 Living coccolithophores from the eastern equatorial Indian Ocean during the spring intermonsoon: Indicators of hydrography Jun Sun, Haijiao Liu, Xiaodong Zhang, Cuixia Zhang, and Shuqun Song Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-112,https://doi.org/10.5194/bg-2017-112,2017
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
The coccolithophore abundance in this study was relatively low, resulting from the weak winds and minimal nutrient upwelling compared to previous studies that were conducted during the monsoon seasons. During the spring intermonsoon period, no significant oceanic circulation occurred in the EEIO except for WJs. We inferred that, in the study area, different coccolithophore species had specific environmental preferences. Thus, coccolithophore species are good indicators of oceanographic changes.Hide
12 May 2017 Accounting for multiple forcing factors and product substitution enforces the cooling effect of boreal forests Eero Nikinmaa, Tuomo Kalliokoski, Kari Minkkinen, Jaana Bäck, Michael Boy, Yao Gao, Nina Janasik-Honkela, Janne I. Hukkinen, Maarit Kallio, Markku Kulmala, Nea Kuusinen, Annikki Mäkelä, Brent D. Matthies, Mikko Peltoniemi, Risto Sievänen, Ditte Taipale, Lauri Valsta, Anni Vanhatalo, Martin Welp, Luxi Zhou, Putian Zhou, and Frank Berninger Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-141,https://doi.org/10.5194/bg-2017-141,2017
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
We estimated the impact of boreal forest management on climate, considering the effects of carbon, albedo, aerosols, and effects of industrial wood use. We made analyses both in current and warmer climate of 2050. The aerosol effect was comparable to that of carbon sequestration. Deciduous trees may have a large potential for mitigation due to their high albedo and aerosol effects. If the forests will be used more intensively and mainly for pulp and energy, the warming influence is clear.Hide
08 May 2017 Seasonal effects of photophysiology and chlorophyll _a_ abundance on phytoplankton group-specific primary production in the Kuroshio region as revealed by SeaStar/SeaWiFS Takafumi Hirata and Koji Suzuki Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-164,https://doi.org/10.5194/bg-2017-164,2017
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
This work delivers a regional estimates of primary production due to diatoms, haptophytes and cyanobacteria around the Kuroshio current. Using a novel methodology, photosynthetic efficiency and abundance of marine phytoplankton are now viewed from a satellite in space. Our see that variability in primary production by diatoms is mainly regulated by their abundance rather than their efficiency, whereas the variability by cyanobacteria is more regulated by their efficiency than their abundance.Hide
03 May 2017 Vulnerability of soil organic matter of anthropogenically disturbed organic soils Annelie Säurich, Bärbel Tiemeyer, Axel Don, Michel Bechtold, Wulf Amelung, and Annette Freibauer Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-127,https://doi.org/10.5194/bg-2017-127,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Drained organic soils are hotspots of CO2 emissions. Due to mineralisation and mixing with mineral soil, the soil organic carbon (SOC) content of large areas of former peatlands decreased drastically. We evaluated potential CO2 emissions from such soils and true peat by aerobic incubation. Surprisingly, CO2 emissions increased in magnitude and variability with stronger disturbance and lower SOC content. This indicates that mixing peat with mineral soil is not a promising mitigation option.Hide
02 May 2017 Ocean acidification dampens warming and contamination effects on the physiological stress response of a commerciallyimportant fish
Eduardo Sampaio, Ana R. Lopes, Sofia Francisco, Jose R. Paula, Marta Pimentel, Ana L. Maulvault, Tiago Repolho, Tiago F. Grilo, Pedro Pousão-Ferreira, António Marques, and Rui Rosa Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-147,https://doi.org/10.5194/bg-2017-147,2017
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
Through controlled experimental approach, we found that ocean acidification offsets physiological stress prompted by ocean warming and methylmercury contamination. These intertwined mechanisms have great implications in the future fitness of, not only Argyrosomus regius, but also of other teleost fish of commercial and ecological importance, in future ocean scenarios. Our research highlights the need of multi-stressor studies in order to accurately predict future individual and stock conditions.Hide
21 Apr 2017 Biogeochemical diversity and hot moments of GHG emissions from shallow alkaline lakes in the Pantanal of Nhecolândia, Brazil Laurent Barbiero, Marcos Siqueira Neto, Rosangela Rodrigues Braz, Janaina Braga de Carmo, Ary Tavares Rezende Filho, Edmar Mazzi, Fernando Antonio Fernandes, Sandra Regina Damatto, and Plinio Barbosade Camargo
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-108,https://doi.org/10.5194/bg-2017-108,2017
Manuscript not accepted for further review (discussion: closed, 10 comments) Short summaryShort summary
Large tropical alkaline wetlands are likely to contribute significantly to the global GHG emissions budget, but little data are available. The study shows the diversity of situations that depend on local biogeochemical processes and their stage of development during the season. Hot moments are identified and must be taken into account for calculating the regional emission budget.Hide
10 Apr 2017 Atmospheric dry and wet nitrogen deposition in agro-pastoral catchments of the China and Mongolia Altay Jin Ling Lv, Andreas Buerkert, Guo Jun Liu, Chao Yan Lv, Xi Ming Zhang, Kai Hui Li, and Xue Jun Liu Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-55,https://doi.org/10.5194/bg-2017-55,2017
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
Very little research has been conducted to quantify atmospheric N deposition in agro-pastoral transition zones. Based on this, we chose a typical agro-pastoral transition zone in the border area of China and Mongolia and used scientific method to compare the dynamics and amounts of wet and dry N deposition in this area. This will hopefully supply the scientific evidence required to introduce more rational N application and manure management strategies for similar areas throughout central Asia.Hide
05 Apr 2017 The dynamics and export of dissolved organic carbon from subtropical small mountainous rivers during typhoon and non-typhoonperiods
Tsung-Yu Lee, Li-Chin Lee, Jr-Chuan Huang, Shih-Hao Jien, Thomas Hein, Franz Zehetner, Shuh-Ji Kao, and Fuh-Kwo Shiah Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-105,https://doi.org/10.5194/bg-2017-105,2017
Revised manuscript not accepted (discussion: closed, 4 comments) 03 Apr 2017 Carbon cycling on the East Siberian Arctic Shelf – a change in air-sea CO2 flux induced by mineralization of terrestrialorganic carbon
Erik Gustafsson, Christoph Humborg, Göran Björk, Christian Stranne, Leif G. Anderson, Marc C. Geibel, Carl-Magnus Mörth, Marcus Sundbom, Igor P. Semiletov, Brett F. Thornton, and Bo G. Gustafsson Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-115,https://doi.org/10.5194/bg-2017-115,2017
Preprint withdrawn (discussion: closed, 2 comments) Short summaryShort summary
In this study we quantify key carbon cycling processes on the East Siberian Arctic Shelf. A specific aim is to determine the pathways of terrestrial organic carbon (OC) supplied by rivers and coastline erosion – and particularly to what extent degradation of terrestrial OC contributes to air-sea CO2 exchange. We estimate that the shelf is a weak CO2 sink, although this sink is considerably reduced mainly by degradation of eroded OC and to a lesser extent by degradation ofriverine OC.
Hide
22 Mar 2017 Optical and molecular-level characterization of fluvial organic matter biodegradation in a highly urbanized river system Most Shirina Begum, Hyojin Jin, Inae Jang, Jung-Min Lee, Han Bin Oh,and Ji-Hyung Park
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-93,https://doi.org/10.5194/bg-2017-93,2017
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
A basin-scale field survey was combined with two laboratory incubation experiments to explore human impacts on organic matter biodegradation and CO2 emission in a highly urbanized river system in South Korea. The results suggest that river impoundment and pollution can alter the optical properties and biodegradability of both dissolved and particulate organic matter in the modified river system to such a degree that can induce a priming effect on biodegradationand CO2 emission.
Hide
21 Mar 2017 Changing mineralogical properties of shells may help minimize the impact of hypoxia-induced metabolic depression oncalcification
Jonathan Y. S. Leung and Napo K. M. Cheung Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-85,https://doi.org/10.5194/bg-2017-85,2017
Preprint retracted (discussion: closed, 12 comments) Short summaryShort summary
Hypoxia has become more prevalent and probably affects the shell growth of calcifying organisms via metabolic depression. Yet, inconsistent results have been found. We examined the potential compensatory mechanism to hypoxia and found that a calcifying polychaete can maintain shell growth and mechanical strength under hypoxia possibly by changing mineralogical properties of shells. This compensatory mechanism may enable calcifying organisms to persist under metabolically stressful environment.Hide
13 Mar 2017 Nitrous oxide variability at sub-kilometre resolution in the Atlantic sector of the Southern Ocean Imke Grefe, Sophie Fielding, Karen J. Heywood, and Jan Kaiser Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-73,https://doi.org/10.5194/bg-2017-73,2017
Revised manuscript not accepted (discussion: closed, 3 comments) 13 Mar 2017 Rainfall pattern greatly affects water use by Mongolian Scots pine on a sandy soil, in a semi-arid climate Hongzhong Dang, Lizhen Zhang, Wenbin Yang, Jinchao Feng, Hui Han, andWei Li
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-69,https://doi.org/10.5194/bg-2017-69,2017
Manuscript not accepted for further review (discussion: closed, 10 comments) Short summaryShort summary
The large intra- and inter-annual rainfall variances were insufficient to maintain soil moisture levels in the upper soil layers (where the majority of roots lie) at a level sufficient to avoid frequent drought. Daily stand transpiration was sensitive to drought, decreasing by 5–46 % under moderate drought, by 48–62 % under severe drought and by 65 % under extreme drought. This study will enable a much better understanding of the reasons for the observed serious degradation of Mongolian Scots pine.Hide
10 Feb 2017 Seasonal and inter-annual variations in carbon fluxes in a tropical river system (Tana River, Kenya) Naomi Geeraert, Fred O. Omengo, Fredrick Tamooh, Trent R. Marwick, Alberto V. Borges, Gerard Govers, and Steven Bouillon Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-31,https://doi.org/10.5194/bg-2017-31,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
We observed that the relationship between the concentrations and the water discharge in the Tana River changed in wet seasons with and without flooding. Detailed sampling in those seasons is required in order to construct several rating curves and to obtain reliable flux estimates. The sediment and carbon fluxes in function of discharge will help us to asses the flux changes that can be expected when the hydrology changes due to climate change or human impact.Hide
06 Feb 2017 The Relationship between Tropical Cyclone Activity, Nutrient Loading, and Algal Blooms over the Great Barrier Reef Chelsea L. Parker, Amanda H. Lynch, Stephanie A. Spera, and Keith R.Spangler
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-23,https://doi.org/10.5194/bg-2017-23,2017
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
We use satellite imaging to explore the relationships between tropical cyclones and water quality that is harmful to the Great Barrier Reef. Tropical cyclones reduce water quality 8- and 16-days post-storm where cyclone size is more significant than duration or intensity. Water quality declines first through sediments re-suspended by strong winds, then through rainfall runoff and nutrient loading. Leaching and erosion from coastal land must be reduced, especially with future climate change.Hide
30 Jan 2017 Changes in the Si / P weathering ratio and their effect on the selection of coccolithophores and diatoms Virginia García-Bernal, Óscar Paz, and Pedro Cermeño Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-4,https://doi.org/10.5194/bg-2017-4,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Marine diatoms are responsible for roughly 40 % of modern ocean primary production and contribute disproportionately to the drawdown of atmospheric carbon dioxide through the export of organic carbon into the deep sea and sediments. Over the past 40 Myr their rise to ecological prominence and consequential decline of coccolithophores is linked to the silicon to phosphorus weathering ratio, which controls the oceanic nutrient inventories and hence the competitive ability ofdiatoms.
Hide
26 Jan 2017 Holistic monitoring of increased pollutant loading and its impact on the environmental condition of a coastal lagoon with _Ammonia_ as a proxy for impact on biodiversity Areen Sen and Punyasloke Bhadury Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-13,https://doi.org/10.5194/bg-2017-13,2017
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Eutrophication poses a serious threat to the ecological functioning of lagoons in the era of Anthropocene. In this study, using water chemistry and biological (foraminifera) proxies, eutrophication was tracked in Asia's largest coastal lagoon, Chilika for 12 months. The investigation revealed that concentration of dissolved nitrate was extremely high along with sedimentary organic carbon deposit and benthic foraminifera abundance, both of which are characteristics of coastal eutrophication.Hide
18 Jan 2017 R-Package BIOdry: DendroClimatic Modeling from Multilevel Ecological Data Series Wilson Lara, Stella Bogino, and Felipe Bravo Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-550,https://doi.org/10.5194/bg-2016-550,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
BIOdry package was developed for dendroclimatic modeling. The package integrates one-level modeling, multilevel analysis, and multivariate comparison of Multilevel Ecological Data Series. We tested the package by studying dendroclimatic relationships of pine forests (_P. pinaster_ Ait.) of north and east-central Spain. Dendroclimatic inferences were affected by within-sample variabilities. BIOdry package proved to be a valuable tool to study complex dendroclimatic time-space relationships.Hide
12 Jan 2017 Improvement of Soil Respiration Parameterization in a Dynamic Global Vegetation Model and Its Impact on the Simulation of Terrestrial Carbon Fluxes Dongmin Kim, Myong-In Lee, and Eunkyo Seo Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-549,https://doi.org/10.5194/bg-2016-549,2017
Preprint retracted (discussion: closed, 8 comments) Short summaryShort summary
This study investigates the impacts of temperature sensitivity of soil respiration (Q10) on the terrestrial carbon cycle using CLM4 off-line simulation. This study develops a new parameterization for determining Q10 by considering the soil respiration dependence on soil temperature and moisture obtained by multiple regression. The results show that distribution of heterogenous Q10 induces to overcome the soil respiration and GPP distribution comparing with original Q10parameterization.
Hide
09 Jan 2017 High growth potential and activity of 0.2 µm filterable bacteria habitually present in coastal seawater Yumiko Obayashi and Satoru Suzuki Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-560,https://doi.org/10.5194/bg-2016-560,2017
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
We report habitual presence of 0.2 µm filterable forms of typical marine bacteria having high growth potential in temperate coastal seawater. The results imply that starvation forms of marine bacteria should be ubiquitous not only in very oligotrophic open oceans but also in temperate coastal environments, and that these bacteria are always ready for growing in changeable aquatic ecosystems. They are expected to have high activity for organic matter processing in biogeochemical carbon cycle.Hide
02 Jan 2017 No significant changes in topsoil carbon in the grasslands of northern China between the 1980s and 2000s Shangshi Liu, Yuanhe Yang, Haihua Shen, Huifeng Hu, Xia Zhao, He Li, Taoyu Liu, and Jingyun Fang Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-473,https://doi.org/10.5194/bg-2016-473,2017
Preprint retracted (discussion: closed, 4 comments) 20 Dec 2016 Uncertainties in global crop model frameworks: effects of cultivar distribution, crop management and soil handling on crop yieldestimates
Christian Folberth, Joshua Elliott, Christoph Müller, Juraj Balkovic, James Chryssanthacopoulos, Roberto C. Izaurralde, Curtis D. Jones, Nikolay Khabarov, Wenfeng Liu, Ashwan Reddy, Erwin Schmid, Rastislav Skalský, Hong Yang, Almut Arneth, Philippe Ciais, Delphine Deryng, Peter J. Lawrence, Stefan Olin, Thomas A. M. Pugh, Alex C. Ruane, andXuhui Wang
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-527,https://doi.org/10.5194/bg-2016-527,2016
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
Global crop models differ in numerous aspects such as algorithms, parameterization, input data, and management assumptions. This study compares five global crop model frameworks, all based on the same field-scale model, to identify differences induced by the latter three. Results indicate that foremost nutrient supply, soil handling, and crop management induce substantial differences in crop yield estimates whereas crop cultivars primarily result in scaling of yieldlevels.
Hide
19 Dec 2016 Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene Yu-Hyeon Park, Masanobu Yamamoto, Leonid Polyak, and Seung-Il Nam Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-529,https://doi.org/10.5194/bg-2016-529,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
The analysis of microbial lipid (GDGTs) in three sediment cores from the northern Chukchi Sea margin provides insights into GDGTs production, sources and SST in this region of the Arctic during the Holocene. Different patterns in GDGTs distribution between cores may indicate spatial differences in the pathways of Pacific waters and sea-ice extent. TEX86 and TEX86L indices potentially useful for SST reconstruction show millennial-scale variability, but the controls are not well understood.Hide
16 Dec 2016 Intercomparison of Terrestrial Carbon Fluxes and Carbon Use Efficiency Simulated by CMIP5 Earth System Models Dongmin Kim, Myong-In Lee, Su-Jong Jeong, Jungho Im, Dong Hyun Cha,and Sanggyun Lee
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-536,https://doi.org/10.5194/bg-2016-536,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
This study compares historical simulations of the terrestrial carbon cycle produced by 10 ESMs that participated in the CMIP5. The models show noticeable deficiencies compared to the MODIS data and large differences among the simulations, although the MME mean provides a realistic global mean value and spatial distributions. MME is reflected by the systematic biases of simulated biogeochemical processes which depends on temperature conditions strongly in every plant functional types.Hide
12 Dec 2016 Phytoplankton communities determine the spatio-temporal heterogeneity of alkaline phosphatase activity: evidence from a tributary of the Three Gorges Reservoir Yijun Yuan, Yonghong Bi, and Zhengyu Hu Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-455,https://doi.org/10.5194/bg-2016-455,2016
Revised manuscript not accepted (discussion: closed, 7 comments) Shortsummary
Short summary
Alkaline phosphatase plays an important role in phosphorus cycling. In order to screen the alkaline phosphatase activity in the tributaries of the Three Gorges reservoir, annual investigation was conducted in the Xiaojiang River. It was proved that APA in the tributaries of TGR contributed mainly by phytoplankton, and the spatio-temporal heterogeneity of APA was determined by phytoplankton communities. Besides, WL, WT and SRP regulated the spatio-temporal heterogeneity of APA.Hide
07 Dec 2016 Carbon budget assessment of an irrigated wheat and maize rotation cropland with high groundwater table in the North China Plain Quan Zhang, Hui-Min Lei, Da-Wen Yang, Lihua Xiong, and Beijing Fang Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-484,https://doi.org/10.5194/bg-2016-484,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
With the increasing concern about global warming, investigating carbon cycle becomes imperative to predict future climate trend. As cropland has great potentials in mitigating carbon emissions, therefore we designed a comprehensive carbon budget assessment in a typical cropland in North China Plain, the results indicate the high groundwater table contributes to carbon sink of this cropland. The conclusion confirms that field management has profound effect on cropland carbon cycle.Hide
29 Nov 2016 Influence of climate variability, fire and phosphorus limitation on the vegetation structure and dynamics in the Amazon-Cerrado border Emily Ane Dionizio da Silva, Marcos Heil Costa, Andrea Almeida Castanho, Gabrielle Ferreira Pires, Beatriz Schwantes Marimon, Ben Hur Marimon-Junior, Eddie Lenza, and Fernando Martins Pimenta Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-510,https://doi.org/10.5194/bg-2016-510,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
This study uses a dynamic vegetation model to evaluate the role of interannual climate variability, fire occurrence and phosphorus limitation on the vegetation dynamics and structure in the Amazon-Cerrado transition. We show that the inclusion of these factors gradually improve the simulation of vegetation types and, although the model typically simulates more than 80% of the variability of biomass in the transition zone, model improvements are still needed.Hide
22 Nov 2016 Shell dissolution observed in _Limacina helicina antarctica_ from the Ross Sea, Antarctica: paired shell characteristics and in situ seawater chemistry Kevin M. Johnson, Umihiko Hoshijima, Cailan S. Sugano, Alice T. Nguyen, and Gretchen E. Hofmann Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-467,https://doi.org/10.5194/bg-2016-467,2016
Revised manuscript not accepted (discussion: closed, 5 comments) 22 Nov 2016 Passive adsorption of neighbouring plant volatiles linked to associational susceptibility in a subarctic ecosystem Adedayo Mofikoya, Kazumi Miura, Toini Holopainen, and Jarmo K.Holopainen
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-464,https://doi.org/10.5194/bg-2016-464,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
We show in the paper, volatile chemical based plant interaction in a subarctic ecosystem. We provide evidence of passive adsorption of neighbouring plant volatiles and its potential effect on focal plant fitness. Our results show that neighbouring plants might play an important role in the fitness and chemical composition of a plant. This study was done in a nature reserve forest site in the subarctic to minimize the effects of ozone and other environmental pollutants that may degrade volatiles.Hide
15 Nov 2016 Impact of annual and seasonal precipitation and air temperature on gross primary production in Mediterranean ecosystems inEurope
Svenja Bartsch, Bertrand Guenet, Christophe Boissard, Juliette Lathière, Jean-Yves Peterschmitt, Annemiek Stegehuis, Ilja-M. Reiter, Thierry Gauquelin, Virginie Baldy, and Catherine Fernandez Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-491,https://doi.org/10.5194/bg-2016-491,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Mediterranean ecosystems are significant carbon sinks but the carbon dynamic in such ecosystem is still not fully understood. An improved understanding of the drivers of the carbon fixation by plants is needed to better predict how such ecosystems will respond to climate change. We showed that annual precipitation was not a significant driver of annual carbon fixation by plants.Hide
03 Nov 2016 Quantification of basal ice microbial cell delivery tothe glacier margin
Mario Toubes-Rodrigo, Simon J. Cook, David Elliott, and Robin Sen Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-471,https://doi.org/10.5194/bg-2016-471,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
For the first time, we have quantified the amount of cells exported from sediment-rich glacier basal ice to the glacier margin. Approximately 1017 cells per year are being released to the forefront of Svínafellsökull (SE Iceland), and in laboratory conditions between 101 and 106 cells per gram of sediment were able to proliferate. These cells may trigger the process of soil formation that will end up with the establishment of vegetation in the bare sediment the glacier leave after its retreatHide
24 Oct 2016 Acidification counteracts negative effects of warming on diatom silicification Alexandra Coello-Camba and Susana Agustí Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-424,https://doi.org/10.5194/bg-2016-424,2016
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
We demonstrated that the effects of increased temperature and _p_CO2 on the silicification process in diatoms are interactive, showing a temperature dependent capacity of increased _p_CO2 to buffer the negative effects of warming. Therefore, as long as the increase in temperature does not surpass the buffering capacity of _p_CO2, the increase of this latter stressor will help diatoms to retain their sinking properties, preserving their role in the biogeochemical cycles of silica and carbon.Hide
13 Oct 2016 Functional classification of bioturbating macrofauna in marine sediments using time-resolved imaging of particle displacement and multivariate analysis Stina Lindqvist, Johan Engelbrektsson, Susanne P. Eriksson, and StefanHulth
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-411,https://doi.org/10.5194/bg-2016-411,2016
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
This contribution describes a general procedure for functional classification of benthic macrofauna based on a suite of variables for particle reworking. Despite the challenge to generalize species functionality, time-resolved high-resolution imaging of particle displacement combined with multivariate analysis, provides a general tool for functional classification of macrofauna. Species were grouped in accordance to quantity and time, as well as vertical distance ofparticle transport.
Hide
04 Oct 2016 Climate-driven change in a Baltic Sea summer microplanktonic community – desalination play a more important role than ocean acidification Angela Wulff, Maria Karlberg, Malin Olofsson, Anders Torstensson, Lasse Riemann, Franciska Steinhoff, Malin Mohlin, Nina Ekstrand, andMelissa Chierici
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-383,https://doi.org/10.5194/bg-2016-383,2016
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
The Baltic Sea could expect increased precipitation (lower salinity) and increased concentration of atmospheric CO2 over the next 100 years. In a 12-day outdoor experiment, we tested the combined effects of lower salinity and increased CO2 concentrations on a natural summer microplanktonic community. Lower salinity seemed more important than increased _p_CO2. Thus, we do not expect any dramatic effects of increased _p_CO2 in combination with decreased salinity on the Baltic microplanktonic food web.Hide
29 Sep 2016 Combined effects of elevated _p_CO2 and temperature on biomass and carbon fixation of phytoplankton assemblages in the northern South China Sea Guang Gao, Peng Jin, Nana Liu, Futian Li, Shanying Tong, David A. Hutchins, and Kunshan Gao Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-403,https://doi.org/10.5194/bg-2016-403,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Our shipboard experiments showed high temperature and CO2 (HTHC) did not affect phytoplankton biomass at nearshore station but decreased it at offshore station. HT did not change dark respiration at nearshore station but enhanced it at offshore station. Our findings indicate that responses of coastal and offshore phytoplankton assemblages to ocean warming and acidification may be contrasting, with the pelagic phytoplankton communities being more sensitive to these two globalchange factors.
Hide
16 Sep 2016 Relating historical vegetation cover to aridity index patterns in the greater desert region of northern China: Implications to planned and existing restoration projects Yanying Shao, Yuqing Zhang, Xiuqin Wu, Charles P.-A. Bourque, Jutao Zhang, Shugao Qin, and Bin Wu Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-376,https://doi.org/10.5194/bg-2016-376,2016
Preprint retracted (discussion: closed, 10 comments) Short summaryShort summary
Methods of aridity index, Mann–Kendall test and Convergent cross mapping were combined to quantify the spatiotemporal variations in precipitation, air temperature, aridity, and vegetation, and to assess plant growth with respect to climatic changes in dryland. Our results show a practically relevant in ecological restoration and implicate that future planning of new restoration projects should ideally take into account drying/wetting trends currently being observed innorthern China.
Hide
06 Sep 2016 Responses of the diatom _Asterionellopsis glacialis_ to increasing sea water CO2 concentrations and the effect of turbulence Francesca Gallo, Kai G. Schulz, Eduardo B. Azevedo, João Madruga, and Joana Barcelos e Ramos Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-352,https://doi.org/10.5194/bg-2016-352,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Global change driven by humans activities may affect phytoplankton, which are important primary producers. Assessing the combined effect of turbulence and ocean acidification on the species Asterionellopsis glacialis, we found that turbulence magnifies the acidification stress, with negative effects on their growth. In the natural environment, this might have consequences to phytoplankton community composition and production with feedbacks to climate.Hide
31 Aug 2016 Hydrothermal activity lowers trophic diversity in Antarctic sedimented hydrothermal vents James B. Bell, William D. K. Reid, David A. Pearce, Adrian G. Glover, Christopher J. Sweeting, Jason Newton, and Clare Woulds Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-318,https://doi.org/10.5194/bg-2016-318,2016
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
Areas of the deep-seafloor where hydrothermal fluid flows through sediment are amongst the least studied environments on the planet. We studied the faunal and microbial food webs at one such system in the Southern Ocean and found evidence of a wide range of organic matter fixation pathways, both at vent sites and non-vent sites. Although faunal uptake of in situ food production was low, it was much wider spread than previously realised, raising important questions aboutseafloor food webs.
Hide
24 Aug 2016 Rooting and plant density strongly determine greenhouse gas budget of water hyacinth (_Eichhornia crassipes_) mats Ernandes Sobreira Oliveira Junior, Yingying Tang, Sanne J. P. van den Berg, Leon P. M. Lamers, and Sarian Kosten Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-297,https://doi.org/10.5194/bg-2016-297,2016
Manuscript not accepted for further review (discussion: closed, 12 comments) Short summaryShort summary
The differential effects of the aquatic plants on greenhouse gas fluxes may be due to plant density and whether or not the plant roots can access the sediment. We therefore looked into the effect of these two variables on water hyacinth greenhouse gas balance using a laboratory experiment. We found that greenhouse gas dynamics were strongly influenced by plant density and rooting. Our findings pinpoint management options that can optimize carbon sequestration and minimize CH4 emissions.Hide
21 Jul 2016 Anaerobic methane oxidation in an East African great lake(Lake Kivu)
Fleur A. E. Roland, François Darchambeau, Cédric Morana, Sean A. Crowe, Bo Thamdrup, and Alberto V. Borges Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-300,https://doi.org/10.5194/bg-2016-300,2016
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
We studied methane consumption in a tropical Great Lake (Lake Kivu, East Africa). Lake Kivu has huge methane concentrations in its deep anoxic waters, but is a very poor emitter of methane to the atmosphere, which suppose a strong methane consumption in the water column. During this study, we put in evidence high aerobic and anaerobic consumption rates, whose relative importance varied with the season (higher aerobic rates in dry season, when the oxic compartmentis wider).
Hide
30 Jun 2016 Seasonal variability of dissolved organic matter in the Columbia River: In situ sensors elucidate biogeochemical and molecularanalyses
Urban Johannes Wünsch, Boris Peter Koch, Matthias Witt, and JosephAndrew Needoba
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-263,https://doi.org/10.5194/bg-2016-263,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
We used a combination of continuously measuring water chemistry sensors and periodic sampling efforts to assess the seasonal variability of dissolved organic matter (DOM) in the Columbia River in spring and summer 2013. We found that our sensors can provide detailed data on carbon export that far exceed usual monitoring efforts. The detailed data help to understand the impact of short-lived events, such as rainstorms, on the overall terrestrial carbon flux in theColumbia River.
Hide
30 Jun 2016 Continuous measurements of nitrous oxide isotopomers during incubation experiments Malte Winther, David Balslev-Harder, Søren Christensen, Anders Priemé, Bo Elberling, Eric Crosson, and Thomas Blunier Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-258,https://doi.org/10.5194/bg-2016-258,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Nitrous oxide (N2O) is an important and strong greenhouse gas in the atmosphere and part of climate. N2O is produced by microbes in terrestrial and aquatic ecosystems. The properties of each specific molecule can be used to determine the source. We implemented continuous measurements of N2O during incubation of denitrifying bacteria and believe that similar experiments will lead to a better understanding of N2O turnover and on the biotic mechanisms behind greenhouse gas exchange of the Globe.Hide
20 Jun 2016 Feasibility for detection of ecosystem response to disturbance by atmospheric carbon dioxide Bjorn-Gustaf J. Brooks, Ankur R. Desai, Britton B. Stephens, Anna M. Michalak, and Jakob Zscheischler Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-223,https://doi.org/10.5194/bg-2016-223,2016
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
CO2 is the primary greenhouse gas, and its abundance in the atmosphere tends to increase during disturbances like drought. This paper demonstrates how CO2 measurements are combined with models to determine not only how strongly different locations influence CO2 measurement stations, but also the capacity of those measurement stations to detect drought effects. Understanding detection sensitivity will help assess what kinds of changes and turnings points can be monitored using atmospheric CO2.Hide
16 Jun 2016 Agricultural uses reshape soil C, N, and P stoichiometry in subtropical ecosystems H. Y. Liu, J. G. Zhou, J. Shen, Y. Y. Li, Y. Li, T. D. Ge, G. Guggenberger, and J. Wu Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-211,https://doi.org/10.5194/bg-2016-211,2016
Revised manuscript not accepted (discussion: closed, 8 comments) Shortsummary
Short summary
We studied the spatial distribution of soil C, N, and P (carbon, nitrogen, and phosphorus) stoichiometry of the ecosystems in a subtropical catchment, and found that the stoichiometry was shaped in relatively narrow ranges in agricultural uses, and its spatial variations with topography were remarkably reduced. Thus, our findings demonstrate that intensive agriculture can change the spatial distributions of soil C, N, and P and the associated stoichiometry in a hilly subtropical catchment.Hide
14 Jun 2016 Using coupled hydrodynamic biogeochemical models to predict the effects of tidal turbine arrays on phytoplankton dynamics Pia Schuchert, Louise Kregting, Daniel Pritchard, Graham Savidge, andBjörn Elsäßer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-232,https://doi.org/10.5194/bg-2016-232,2016
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
There are environmental concerns associated with the installation of tidal energy devices (TEDs) along coastal environments. One concern relates to the likely change in the hydrodynamics where changes in hydrodynamics may potentially modify key predictors of phytoplankton derived primary production. Using a coupled 2-dimensional biogeochemical and hydrodynamic model, results showed that light had a larger effect on phytoplankton dynamics than an array of TEDs.Hide
06 Jun 2016 Large uncertainty in ecosystem carbon dynamics resulting from ambiguous numerical coupling of carbon and nitrogen biogeochemistry: A demonstration with the ACME land model Jinyun Tang and William J. Riley Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-233,https://doi.org/10.5194/bg-2016-233,2016
Preprint retracted (discussion: closed, 4 comments) 01 Jun 2016 Under a new light: validation of eddy covariance flux with light response functions of assimilation and estimates of heterotrophic soil respiration Georgia R. Koerber, Wayne S. Meyer, Qiaoqi SUN, Peter Cale, andCacilia M. Ewenz
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-182,https://doi.org/10.5194/bg-2016-182,2016
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
A severe bushfire in January 2014 at the Calperum flux tower, operational since August 2010, provided variation in ecosystem respiration and leaf area index to estimate the heterotrophic soil respiration from the y-intercept and was 44 % of net ecosystem exchange of carbon dioxide in the year after the bushfire. Light response functions with a calculated assimilation from equalizing the soil temperature and water content in the night and day allowed incorporation of light suppressed autotrophic respiration.Hide
30 May 2016 Microtopography matters for CH4 formation in a peat soil: a combined inhibitor and 13C study Johannes Krohn, Ivana Lozanovska, Yakov Kuzyakov, and Maxim Dorodnikov Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-162,https://doi.org/10.5194/bg-2016-162,2016
Revised manuscript not accepted (discussion: closed, 4 comments) 19 May 2016 Monodeuterated methane: an isotopic probe to measure biological methane metabolism rates and track catabolic exchangereactions
Jeffrey J. Marlow, Joshua A. Steele, Wiebke Ziebis, Silvan Scheller, David Case, and Victoria J. Orphan Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-202,https://doi.org/10.5194/bg-2016-202,2016
Revised manuscript not accepted (discussion: closed, 7 comments) Shortsummary
Short summary
Methane is a powerful greenhouse gas that plays a major role in the planet's biogeochemical cycles and climate system. Measuring rates of microbial methane consumption is an important capability that allows scientists to better quantify fluxes between reservoirs and assess potential impacts. This study presents a new method for measuring these rates using monodeuterated methane; the approach is logistically streamlined and offers a distinct isotopic dimension for methane metabolism analysis.Hide
17 May 2016 Seasonal and vertical variations in soil CO2 production in a beech forest: an isotopic flux-gradient approach Emilie Delogu, Bernard Longdoz, Caroline Plain, and Daniel Epron Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-194,https://doi.org/10.5194/bg-2016-194,2016
Preprint withdrawn (discussion: closed, 3 comments) 17 May 2016 Response of soil respiration to nitrogen addition along a degradation gradient in a temperate steppe of northern China Jinbin Chen, Xiaotian Xu, Hongyan Liu, and Wei Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-119,https://doi.org/10.5194/bg-2016-119,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Our research main results were that the response of soli respiration differed with the severity of degradation after nitrogen addition. And the difference of magnitude of soil respiration were decreased along with nitrogen fertilizer. In additon, we found that the dominat factor controlling soil respiration changed across different degradation grasslands. Those results showed that degradation affected soil respiration and nitrogen addition might alter degraded grasslands soilcarbon emissions.
Hide
10 May 2016 Sediment characteristics as an important factor for revealing carbon storage in _Zostera marina_ meadows: a comparison offour European areas
Martin Dahl, Diana Deyanova, Silvia Gütschow, Maria E. Asplund, Liberatus D. Lyimo, Ventzislav Karamfilov, Rui Santos, Mats Björk, and Martin Gullström Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-137,https://doi.org/10.5194/bg-2016-137,2016
Manuscript not accepted for further review (discussion: closed, 3comments)
03 May 2016 Distinctly different bacterial communities in surface and oxygen minimum layers in the Arabian Sea Mandar Bandekar, Nagappa Ramaiah, Anand Jain, and Ram Murti Meena Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-147,https://doi.org/10.5194/bg-2016-147,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Oxygen minimum zones occur mostly in nutrient rich upwelling regions. They are sprawling intensifying due to anthropogenic impacts. In denitrification depths of 200–1000 m in Arabian Sea (AS) DO is < 20 M making it the largest anoxic region. We aimed to delineate phylogenetic diversity of bacterial community and find it to be diverse yet distinctively different communities predominate surface and OMZ layers. Prokaryote types adapted to low DO likely play vital roles in C, N & S cycling in AS OMZ.Hide
29 Apr 2016 Improving vegetation phenological parameterization of aland surface model
Baozhang Chen and Mingliang Che Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-165,https://doi.org/10.5194/bg-2016-165,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Most studies of phenological estimates focusing on the phenology (RSP) retrieval algorithms based on remote sensing data, however, published studies that comparing process-based phenology models are limited. In this study, we evaluated two common used phenological algorithms in a land surface model (LSM) with selected eddy covariance flux tower measurements. We concluded the growing season index algorithm has good performance and can reasonably capture vegetation phenological changes in LSMs.Hide
25 Apr 2016 Evaluation of modeled global carbon dynamics: analysis based on global carbon flux and above-ground biomass data Bao-Lin Xue, Qinghua Guo, Tianyu Hu, Yongcai Wang, Shengli Tao, Yanjun Sun, Jin Liu, and Xiaoqian Zhao Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-142,https://doi.org/10.5194/bg-2016-142,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Validation of dynamic global vegetation models are usually hampered by the poor availability of global biomass data over global scales. We evaluated model simulated gross primary production (GPP) and potential above-ground biomass (AGB) by literature-collected values. Independent validation showed that model could reproduce spatial patterns of GPP and evapotranspiration; but not for AGB. Results also showed that different meteorological inputs can also introduce substantialdifference in AGB.
Hide
11 Apr 2016 Integrating aquatic and terrestrial biogeochemical model to predict effects of reservoir creation on CO2 emissions Weifeng Wang, Nigel T. Roulet, Youngil Kim, Ian B. Strachan, Paul del Giorgio, Yves T. Prairie, and Alain Tremblay Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-100,https://doi.org/10.5194/bg-2016-100,2016
Revised manuscript not accepted (discussion: closed, 7 comments) Shortsummary
Short summary
Water reservoirs emit greenhouse gases. We developed a 1-dimensional biogeochemical model to predict CO2 emissions from boreal reservoirs. We found that the CO2 emissions are initially high, steeply decline in the first three years, and then steadily decrease with increasing reservoir age, suggesting that flooded terrestrial organic matter has long-term (> 100 years) effects on CO2 emissions. Our model could be used to evaluate the role of boreal reservoirs as sources of greenhouse gas emissions.Hide
06 Apr 2016 Ecosystem feedbacks from subarctic wetlands: vegetative and atmospheric CO2 controls on greenhouse gas emissions Matthew J. Bridgman, Barry H. Lomax, and Sofie Sjogersten Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-105,https://doi.org/10.5194/bg-2016-105,2016
Preprint withdrawn (discussion: closed, 4 comments) Short summaryShort summary
This study investigate if elevated atmospheric carbon dioxide enhance methane emissions from wetlands and if responses vary among different sedge species. Half of the species increased in biomass under elevated carbon dioxide compared to controls, resulting in greater soil methane emissions. In contrast, biomass and methane emissions of the other species was reduced under elevated carbon dioxide. This shows that species specific responses to elevated carbon dioxide impacted methaneemissions.
Hide
04 Apr 2016 Spatial Patterns of Phosphorus Fractions in Soils of Temperate Forest Ecosystems with Silicate Parent Material Florian Werner, Tilman René de la Haye, Sandra Spielvogel, and JörgPrietzel
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-98,https://doi.org/10.5194/bg-2016-98,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
We assessed spatial patterns of phosporus (P) in soils of a geosequence and major P binding partners to describe spatial and pedogenetic changes of P distribution and to identify mechanisms for these changes. We found, that the distribution of total P was generally best matched by the distribution pattern of organic P. Soil organic matter-sesquioxide-complexes, as well as Al and Fe oxyhydroxides were identified as main binding partners of organic P at all stages of pedogenesis.Hide
04 Apr 2016 Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia Fabian Beermann, Moritz Langer, Sebastian Wetterich, Jens Strauss, Julia Boike, Claudia Fiencke, Lutz Schirrmeister, Eva-Maria Pfeiffer,and Lars Kutzbach
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-117,https://doi.org/10.5194/bg-2016-117,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
This paper aims to quantify pools of inorganic nitrogen in permafrost soils of arctic Siberia and to estimate annual release rates of this nitrogen due to permafrost thaw. We report for the first time stores of inorganic nitrogen in Siberian permafrost soils. These nitrogen stores are important as permafrost thaw can mobilize substantial amounts of nitrogen, potentially changing the nutrient balance of these soils and representing a significant non-carbon permafrostclimate feedback.
Hide
04 Apr 2016 Wildfire effects on ecosystem nitrogen cycling in a Chinese boreal larch forest, revealed by 15N natural abundance Weili Liu, Lin Qi, Yunting Fang, and Jian Yang Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-91,https://doi.org/10.5194/bg-2016-91,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Wildfire is a major disturbance in boreal forest ecosystem and strongly affects ecosystem N cycling. We find that even 5 years after a wildfire, isotopic signatures of soil and plant N pools are still different from those in unburned areas in a Chinese boreal forest. Our results show persistent legacy effects in the form of increased N losses following wildfires. The fire-induced increases in NH3 volatilization may greatly contribute to the increased δ15N values inplant and soil.
Hide
04 Apr 2016 Icelandic grasslands as long-term C sinks under elevatedN inputs
Niki I. W. Leblans, Bjarni D. Sigurdsson, Rien Aerts, Sara Vicca, Borgthór Magnússon, and Ivan A. Janssens Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-111,https://doi.org/10.5194/bg-2016-111,2016
Revised manuscript not accepted (discussion: closed, 5 comments) Shortsummary
Short summary
Increasing nitrogen (N) deposition has enhanced productivity in many ecosystems and thereby the terrestrial sink for anthropogenic CO2 emissions. However, little is known about how long this N-induced carbon (C) sink can continue. We studied the effect of elevated N inputs on short- (decadal) and long-term (millennial) C storage in Icelandic grasslands and found that chronically elevated N inputs led to a strengthening of this sink for at least 1600 years, in absence of large-scale disturbances.Hide
23 Mar 2016 Tracking the direct impact of rainfall on groundwater at Mt. Fuji by multiple analyses including microbial DNA Ayumi Sugiyama, Suguru Masuda, Kazuyo Nagaosa, Maki Tsujimura, andKenji Kato
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-78,https://doi.org/10.5194/bg-2016-78,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Direct impact of rainfall on groundwater at Mt. Fuji, the largest volcanic mountain in Japan, was elucidated by multiple analyses including microbial DNA. Bacterial abundance and DNA not only supported the findings on the movement of groundwater obtained from chemical analyses, but elucidated chemically unseen flow. An evidence of piston flow in deep groundwater was first shown through changes in Archaeal density and diversity. Microbial analysis extends our understanding of groundwater.Hide
21 Mar 2016 Mechanisms of methane transport through _Populustrichocarpa_
Ellynne Kutschera, Aslam Khalil, Andrew Rice, and Todd Rosenstiel Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-60,https://doi.org/10.5194/bg-2016-60,2016
Revised manuscript has not been submitted (discussion: closed, 6 comments) Short summaryShort summary
The paper presents new research on how this important greenhouse gas is transported from the soil to the atmosphere through trees. A relationship between methane flux and temperature is found. Isotopic fractionation of methane is measured: warmer temperatures result in higher flux and smaller fractionation. Multiple transport processes are likely at work, where different mechanisms dominate at low and high temperatures. This has implications for methane flux from treesin a warmer world.
Hide
17 Mar 2016 Lagrangian characterization of nitrate supply and episodes of extreme phytoplankton blooms in the Great Australian Bight Paulina Cetina-Heredia, Erik van Sebille, Richard Matear, and MoninyaRoughan
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-53,https://doi.org/10.5194/bg-2016-53,2016
Revised manuscript not accepted (discussion: closed, 3 comments) Shortsummary
Short summary
Characterizing phytoplankton growth influences fisheries and climate. We use a lagrangian approach to identify phytoplankton blooms in the Great Australian Bight (GAB), and associate them with nitrate sources. We find that 88 % of the nitrate utilized in blooms is originated between the GAB and the SubAntarctic Front. Large nitrate concentrations are supplied at depth but do not reach the euphotic zone often. As a result, 55 % of blooms utilize nitrate supplied inthe top 100 m.
Hide
15 Mar 2016 Dryland vegetation functional response to altered rainfall amounts and variability derived from satellite time seriesdata
Gregor Ratzmann, Ute Gangkofner, Britta Tietjen, and Rasmus Fensholt Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-48,https://doi.org/10.5194/bg-2016-48,2016
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Anticipating impacts of changes in rainfall regimes on dryland ecosystems requires the understanding of the functional response to rainfall of those water limited environments. Here we show for two arid/semi-arid African regions based on satellite data that higher rainfall variability leads to a more dynamic vegetation response to rainfall. This applies irrespective of vegetation type. It moreover indicates that regions experiencing a higher rainfall variability may be more resilient to drought.Hide
25 Feb 2016 Reviews and syntheses: Methane biogeochemistry in Sundarbans mangrove ecosystem, NE coast of India; a box modelingapproach
Manab Kumar Dutta and Sandip Kumar Mukhopadhyay Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-58,https://doi.org/10.5194/bg-2016-58,2016
Revised manuscript not accepted (discussion: closed, 3 comments) Shortsummary
Short summary
This study made an detailed understanding on production, consumption and fluxes of methane from different sub-ecosystems of Sundarbans mangrove forest. The mangrove environment was found to be rich in organic carbon content as well as methane concentration. A most of the produced methane transported to the atmosphere where 85 % of total supply undergoes photo-oxidation. Like sediment estuaries are also methane supersatuarated and about 70 % of methane within estuary undergoes microbial oxidation. This article is included in the Encyclopedia of GeosciencesHide
22 Feb 2016 Rates and pathways of CH4 oxidation in ferruginous LakeMatano, Indonesia
A. Sturm, D. A. Fowle, C. Jones, K. Leslie, S. Nomosatryo, C. Henny, D. E. Canfield, and S. A. Crowe Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-533,https://doi.org/10.5194/bg-2015-533,2016
Revised manuscript has not been submitted (discussion: closed, 3 comments) Short summaryShort summary
Methane is a very potent greenhouse gas whose release into the atmosphere has become a growing concern for global climate change. In nearly every aquatic environment there are microbes which either produce methane as a by-product of their metabolism or consume it for energy. Our work examined the rates of methane consumption through experimentation in a deep tropical lake to help quantify global emissions of this greenhouse gas from these environments and provide context for paleo-carbon cycles.Hide
19 Feb 2016 The pelagic microbial food web structure in Sanggou Bay, Yellow Sea: Spatial variation over four successive seasons Xue Chen, Wuchang Zhang, Michel Denis, Yuan Zhao, Lingfeng Huang, Zengjie Jiang, and Tian Xiao Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-665,https://doi.org/10.5194/bg-2015-665,2016
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
We documented the distributions of environmental variables and abundances and biomasses of MFW components. Cluster analysis leaded to distinguish Inner Bay and Outer Bay clusters at each season. We confirmed the existence of a strong relationship among all MFW components and established upper and lower empirical linear boundaries for all the MFW component relationships with HP. Our study showed that the normalisation method could be used in marine area to study the microbial food web structure.Hide
12 Feb 2016 The silica-carbon biogeochemical cycle in the Bohai Sea and its responses to the changing terrestrial loadings Jun Liu, Lex Bouwman, Jiaye Zang, Chenying Zhao, Xiaochen Liu, andXiangbin Ran
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-42,https://doi.org/10.5194/bg-2016-42,2016
Manuscript not accepted for further review (discussion: closed, 4comments)
11 Feb 2016 The asynchronous response of carbon gain and water loss generate spatio-temporal pattern of WUE along elevation gradient insouthwest China
Xiangyang Sun, Mei Huang, and Genxu Wang Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-652,https://doi.org/10.5194/bg-2015-652,2016
Manuscript not accepted for further review (discussion: closed, 4comments)
11 Feb 2016 Which are important soil parameters influencing the spatial heterogeneity of 14C in soil organic matter? Stephan John, Gerrit Angst, Kristina Kirfel, Sebastian Preusser, Carsten W. Mueller, Christoph Leuschner, Ellen Kandeler, and JanetRethemeyer
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-11,https://doi.org/10.5194/bg-2016-11,2016
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
In this manuscript we investigate chemical, biological and physical soil parameters and their influence on 14C contents and distribution in three nearby soil profiles under beech forest. We found a large heterogeneity in 14C contents in the profiles, mainly caused by the abundance of roots. Our results indicate that 14C analysis of individual soil profiles – as it is done in most studies – may lead to misleading assumptions of SOM turnover in soils when extrapolated on larger areas.Hide
10 Feb 2016 Soil greenhouse gases emissions reduce the benefit of mangrove plant to mitigating atmospheric warming effect Guangcheng Chen, Bin Chen, Dan Yu, Yong Ye, Nora F. Y. Tam, andShunyang Chen
Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-662,https://doi.org/10.5194/bg-2015-662,2016
Revised manuscript not accepted (discussion: closed, 10 comments)Short summary
Short summary
Up to now, the adverse warming effect of soil greenhouse gas (GHG) emissions has scarcely been considered with respect to the role of mangrove wetlands in mitigating global warming. Our study showed that the warming effect of soil GHG emission would largely offset the benefit of plant CO2 sequestration, and we propose the assessment of the direct mitigation of atmospheric warming by mangrove ecosystem that should take into account both soil greenhouse gas emissions and plant CO2 sequestration.Hide
02 Feb 2016 Are fire mediated feedbacks burning out of control? J. Lloyd and E. M. Veenendaal Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-660,https://doi.org/10.5194/bg-2015-660,2016
Revised manuscript not accepted (discussion: closed, 3 comments) Shortsummary
Short summary
Fire has been proposed as the key driver of tropical forest and savanna biome distributions with many tropical ecologists believing that these biomes constitute alternate stable states (ASS). Contributing to an ongoing debate as evidence supporting the existence of ASS in the terrestrial tropics, we find all current arguments presented as supporting the existence of ASS to be flawed, with five specific fallacious argumentation types identified.Hide
29 Jan 2016 Deep-sea ecosystem: a world of positive biodiversity – ecosystem functioning relationships? Elisa Baldrighi, Donato Giovannelli, Giuseppe d’Errico, Marc Lavaleye, and Elena Manini Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-26,https://doi.org/10.5194/bg-2016-26,2016
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
The manuscript provides new interesting insights into the investigation of the relationship between biodiversity and ecosystem functioning (BEF) in the deep-sea ecosystems. We show the effect of macrobenthic fauna structural and functional diversity on the ecosystem functioning and efficiency. The effect of the “rare” species on the BEF relations has been discussed. Understanding BEF relationships an the processes underneath is pivotal in preserving the deep-sea ecosystem and its functioning.Hide
18 Jan 2016 CO2 emissions from German drinking water reservoirs estimated from routine monitoring data H. Saidi and M. Koschorreck Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-648,https://doi.org/10.5194/bg-2015-648,2016
Manuscript not accepted for further review (discussion: closed, 6 comments) Short summaryShort summary
Reservoirs are a significant source of greenhouse gases. We determined the emission of CO2 from a large number of German drinking water reservoirs from routine monitoring data. German reservoirs were only a small source of CO2. Differences between reservoirs were caused by the CO2 concentration in the water and could be approximated from the pH of the water. Weather fluctuations had a minor impact on annual emissions. In total, German drinking water reservoirs emitt 44000 t ofCO2 anually.
Hide
18 Jan 2016 Technical Note: Rapid Normal-phase Separation of Phytoplankton Lipids by Ultra-High Performance Supercritical Fluid Chromatography (UHPSFC) J. Brandsma, T. R. Sutton, J. M. Herniman, J. E. Hunter, T. E. G. Biggs, C. Evans, C. P. D. Brussaard, A. D. Postle, T. J. Jenkins, andG. J. Langley
Biogeosciences Discuss., https://doi.org/10.5194/bg-2016-13,https://doi.org/10.5194/bg-2016-13,2016
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
Marine phytoplankton fix around 1 billion tonnes of carbon as lipid biomass each year. We present a new method for analysing complex lipid mixtures from phytoplankton biomass using supercritical fluid technology which has better resolution and is several times faster than existing methods. Thus, it enables larger-scale and more in-depth studies of phytoplankton lipid metabolism, the way it is controlled by ecological and environmental processes, and its impact on globalbiogeochemistry.
Hide
18 Jan 2016 Controls of longitudinal variation in δ13C-DIC in rivers: A global meta-analysis K. A. Roach, M. A. Rodríguez, Y. Paradis, and G. Cabana Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-558,https://doi.org/10.5194/bg-2015-558,2016
Revised manuscript not accepted (discussion: closed, 4 comments) 18 Jan 2016 Community change of microorganisms in the Muztagata and Dunde glacier and climatic and environmental implications Yong Chen, Xiang-Kai Li, Jing Si, Guang-Jian WU, Li-De Tian, andShu-Rong Xiang
Biogeosciences Discuss., https://doi.org/10.5194/bg-2015-637,https://doi.org/10.5194/bg-2015-637,2016
Revised manuscript not accepted (discussion: closed, 3 comments) 15 Dec 2015 Differences in spatial and temporal root lifespan of temperate steppes across Inner Mongolia grasslands W.-M. Bai, M. Zhou, Y. Fang, and W.-H. Zhang Biogeosciences Discuss., 12, 19999–20023, https://doi.org/10.5194/bgd-12-19999-2015,https://doi.org/10.5194/bgd-12-19999-2015,2015
Manuscript not accepted for further review (discussion: closed, 9comments)
09 Dec 2015 High-resolution ocean pH dynamics in four subtropical Atlantic benthic habitats C. A. Hernández, S. Clemente, C. Sangil, and J. C. Hernández Biogeosciences Discuss., 12, 19481–19498, https://doi.org/10.5194/bgd-12-19481-2015,https://doi.org/10.5194/bgd-12-19481-2015,2015
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Anthropogenic CO2 emissions cause ocean acidification. Here we present in situ high-resolution coastal pH dynamics data gathered at subtropical Atlantic benthic habitats. These bottoms are characterized by different macroalgae stands, which generate contrasting pH patterns naturally experienced by all organisms within that ecosystem. Ocean acidification exposure experiments or predictive models identifying species at particular risk must incorporate these patterns to be ecologically relevant.Hide
25 Nov 2015 The interaction between nitrogen and phosphorous is a strong predictor of intra-plant variation in nitrogen isotope composition in a desert species J. Zhang, L. Gu, J. Zhang, R. Wu, F. Wang, G. Lin, B. Wu, Q. Lu, andP. Meng
Biogeosciences Discuss., 12, 18769–18794, https://doi.org/10.5194/bgd-12-18769-2015,https://doi.org/10.5194/bgd-12-18769-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) 16 Nov 2015 Concentrations and ratios of Sr, Ba and Ca along an estuarine river to the Gulf of Mexico – implication for sea level rise effects on trace metal distributionS. He and Y. J. Xu
Biogeosciences Discuss., 12, 18425–18461, https://doi.org/10.5194/bgd-12-18425-2015,https://doi.org/10.5194/bgd-12-18425-2015,2015
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
The study found that salinity strongly affects spatiotemporal distributions of Sr and Ca concentrations and their ratios, but has no effect on Ba concentration, which appears mainly geochemically controlled. These results indicate that concentrations of Sr and Ca in the world’s estuaries will very likely increase in the future as sea level rise continues, which could affect aquatic environments and biological communities.Hide
11 Nov 2015 Estimation of nutrient contributions from the ocean across a river basin using stable isotope analysis K. Nakayama, Y. Maruya, K. Matsumoto, M. Komata, K. Komai, and T.Kuwae
Biogeosciences Discuss., 12, 18185–18211, https://doi.org/10.5194/bgd-12-18185-2015,https://doi.org/10.5194/bgd-12-18185-2015,2015
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
We conducted field experiments to understand the recycling of total nitrogen from the ocean across an entire river basin using stable isotope analysis. To our best knowledge, for the world's first we estimated the marine derived nutrients recycling rate. This study also demonstrates that TN may be recycled from the ocean to the river basin not only directly due to runs of salmon, but also indirectly due to subsequent transportation processes, such as sea eagles feeding anddefecation.
Hide
09 Nov 2015 Prescribed-burning vs. wildfire: management implications for annual carbon emissions along a latitudinal gradient of _Calluna vulgaris_-dominated vegetation V. M. Santana, J. G. Alday, H. Lee, K. A. Allen, and R. H. Marrs Biogeosciences Discuss., 12, 17817–17849, https://doi.org/10.5194/bgd-12-17817-2015,https://doi.org/10.5194/bgd-12-17817-2015,2015
Manuscript not accepted for further review (discussion: closed, 7 comments) Short summaryShort summary
We modelled carbon emissions after prescribed burning in heathlands and showed they are linked to biomass production patterns determined by climate. Burning rotations that minimize C losses in one specific place can maximize losses in others. It is a challenge to design management plans for reducing carbon losses, especially when we superimposed wildfires on burning rotations. Predicted increases in wildfire frequencies interact and modify these optimum burning rotation intervals for C loss.Hide
16 Oct 2015 Interactive effects of and light on growth rates and RUBISCO content of small and large centric diatoms G. Li and D. A. Campbell Biogeosciences Discuss., 12, 16645–16672, https://doi.org/10.5194/bgd-12-16645-2015,https://doi.org/10.5194/bgd-12-16645-2015,2015
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Marine photosynthetic diatoms span a range of cellular sizes, with important implications for carbon cycling. Nitrogen is increasing rapidly in coastal areas. We grew small and large marine centric diatoms and found that under low nitrogen media both strains conserved their cellular allocation of nitrogen to their photosynthetic system. The large diatom grew faster under low nitrogen, while the small diatom could exploit high levels of nitrogen to grow faster.Hide
28 Sep 2015 Comparing solubility algorithms of greenhouse gases in Earth-System modelling V. M. N. C. S. Vieira, E. Sahlée, P. Jurus, E. Clementi, H. Pettersson, and M. Mateus Biogeosciences Discuss., 12, 15925–15945, https://doi.org/10.5194/bgd-12-15925-2015,https://doi.org/10.5194/bgd-12-15925-2015,2015
Manuscript not accepted for further review (discussion: closed, 8comments)
28 Sep 2015 Improving estimations of greenhouse gas transfer velocities by atmosphere–ocean couplers in Earth-System and regionalmodels
V. M. N. C. S. Vieira, E. Sahlée, P. Jurus, E. Clementi, H. Pettersson, and M. Mateus Biogeosciences Discuss., 12, 15901–15924, https://doi.org/10.5194/bgd-12-15901-2015,https://doi.org/10.5194/bgd-12-15901-2015,2015
Manuscript not accepted for further review (discussion: closed, 5comments)
24 Sep 2015 Ocean acidification modulates expression of genes and physiological performance of a marine diatom Y. Li, S. Zhuang, Y. Wu, H. Ren, F. Cheng, X. Lin, K. Wang, J. Beardall, and K. Gao Biogeosciences Discuss., 12, 15809–15833, https://doi.org/10.5194/bgd-12-15809-2015,https://doi.org/10.5194/bgd-12-15809-2015,2015
Revised manuscript not accepted (discussion: closed, 3 comments) 23 Sep 2015 Carbon dynamics and changing winter conditions: a review of current understanding and future research directions M. Haei and H. Laudon Biogeosciences Discuss., 12, 15763–15808, https://doi.org/10.5194/bgd-12-15763-2015,https://doi.org/10.5194/bgd-12-15763-2015,2015
Revised manuscript not accepted (discussion: closed, 3 comments) 14 Sep 2015 Environmental controls on leaf wax δD ratios in surface peats across the monsoonal region of China X. Huang, J. Xue, X. Wang, and P. A. Meyers Biogeosciences Discuss., 12, 15157–15184, https://doi.org/10.5194/bgd-12-15157-2015,https://doi.org/10.5194/bgd-12-15157-2015,2015
Manuscript not accepted for further review (discussion: closed, 4comments)
01 Sep 2015 Influence of measurement uncertainties on soluble aerosol iron over the oceans N. Meskhidze, M. S. Johnson, D. Hurley, and K. Dawson Biogeosciences Discuss., 12, 14377–14400, https://doi.org/10.5194/bgd-12-14377-2015,https://doi.org/10.5194/bgd-12-14377-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) 20 Aug 2015 Protist communities in a marine oxygen minimum zone off Costa Rica by 454 pyrosequencing H. Jing, E. Rocke, L. Kong, X. Xia, H. Liu, and M. R. Landry Biogeosciences Discuss., 12, 13483–13509, https://doi.org/10.5194/bgd-12-13483-2015,https://doi.org/10.5194/bgd-12-13483-2015,2015
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
Photosynthetic Dinoflagellates predominated in the surface, while potential parasitic Dinoflagellates and Ciliates dominated in the OMZ and deeper water in Costa Rica Dome. Total and active protists in the anoxic core were distinct from those in others depths. Reduced community diversity and presence of parasitic/symbiotic trophic lifestyles in the suboxic/anoxic OMZ suggests that oxygen deficiency could cause a change of protist community and the associated microbialfood web as well.
Hide
19 Aug 2015 Seasonal, sub-seasonal and spatial fluctuations in oxygen-depleted bottom waters in an embayment of an eastern boundary upwelling system: St Helena Bay G. C. Pitcher and T. A. Probyn Biogeosciences Discuss., 12, 13283–13309, https://doi.org/10.5194/bgd-12-13283-2015,https://doi.org/10.5194/bgd-12-13283-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Seasonal, sub-seasonal and spatial fluctuations in bottom dissolved oxygen (DO) are examined in St Helena Bay, the largest and most productive bay of the southern Benguela upwelling system. Superimposed on the seasonal decline of DO concentrations in bottom waters were sub-seasonal events of hypoxia and anoxia linked to episodic deposition of organic matter as dictated by cell death processes of exceptional dinoflagellate blooms as indicated by increases in bottom Chl a concentrations.Hide
13 Aug 2015 Technical Note: A simple calculation algorithm to separate high-resolution CH4 flux measurements into ebullition and diffusion-derived components M. Hoffmann, M. Schulz-Hanke, J. Garcia Alba, N. Jurisch, U. Hagemann, T. Sachs, M. Sommer, and J. Augustin Biogeosciences Discuss., 12, 12923–12945, https://doi.org/10.5194/bgd-12-12923-2015,https://doi.org/10.5194/bgd-12-12923-2015,2015
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Processes driving the production, transformation and transport of CH4 in wetlands are highly complex. Thus, serious challenges are constitutes in terms of process understanding, potential drivers and the calculation of reliable CH4 emission estimates. We present a simple calculation algorithm to separate CH4 fluxes measured with closed chambers into diffusion- and ebullition-derived components, which helps facilitating the identification of underlying dynamics andpotential drivers.
Hide
07 Aug 2015 Contribution of Marine Group II _Euryarchaeota_ to cyclopentyl tetraethers in the Pearl River estuary and coastal South China Sea: impact on the TEX86 paleothermometer J. X. Wang, C. L. Zhang, W. Xie, Y. G. Zhang, and P. Wang Biogeosciences Discuss., 12, 12455–12484, https://doi.org/10.5194/bgd-12-12455-2015,https://doi.org/10.5194/bgd-12-12455-2015,2015
Revised manuscript not accepted (discussion: closed, 5 comments) 06 Aug 2015 Projected climate change impacts on North Sea and Baltic Sea: CMIP3 and CMIP5 model based scenarios D. Pushpadas, C. Schrum, and U. Daewel Biogeosciences Discuss., 12, 12229–12279, https://doi.org/10.5194/bgd-12-12229-2015,https://doi.org/10.5194/bgd-12-12229-2015,2015
Manuscript not accepted for further review (discussion: closed, 5 comments) Short summaryShort summary
We investigated the potential future climate change impacts to the North Sea and the Baltic Sea ecosystem using a coherent regional downscaling strategy. Multi-model ensembles using CMIP3 and CMIP5 scenarios are examined and comparing projected changes with the present day reference condition, we predicted an increase in Sea Surface Temperature in both the seas, decrease in primary production in the North Sea and an increase in primary production in the BalticSea.
Hide
23 Jul 2015 Technical Note: An improved guideline for rapid and precise sample preparation of tree-ring stable isotope analysis K. Schollaen, H. Baschek, I. Heinrich, and G. Helle Biogeosciences Discuss., 12, 11587–11623, https://doi.org/10.5194/bgd-12-11587-2015,https://doi.org/10.5194/bgd-12-11587-2015,2015
Revised manuscript not accepted (discussion: closed, 6 comments) 21 Jul 2015 Seagrass beds as ocean acidification refuges for mussels? High resolution measurements of _p_CO2 and O2 in a _Zostera marina_ and _Mytilus edulis_ mosaic habitat V. Saderne, P. Fietzek, S. Aßmann, A. Körtzinger, and C. Hiebenthal Biogeosciences Discuss., 12, 11423–11461, https://doi.org/10.5194/bgd-12-11423-2015,https://doi.org/10.5194/bgd-12-11423-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) 17 Jul 2015 The abiotic contribution to total CO2 flux for soils inarid zone
J. Ma, Y. Li, and R. Liu Biogeosciences Discuss., 12, 11217–11244, https://doi.org/10.5194/bgd-12-11217-2015,https://doi.org/10.5194/bgd-12-11217-2015,2015
Manuscript not accepted for further review (discussion: closed, 3comments)
09 Jul 2015 Application of clustering techniques to study environmental characteristics of microbialite-bearing aquatic systems R. Dalinina, V. A. Petryshyn, D. S. Lim, A. J. Braverman, and A. K.Tripati
Biogeosciences Discuss., 12, 10511–10544, https://doi.org/10.5194/bgd-12-10511-2015,https://doi.org/10.5194/bgd-12-10511-2015,2015
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
Microbialites (rocks formed by the activity of microbes) are important geobiologic structures with a ~3.5 billion year record. Despite this, the formation of microbialites is still poorly understood. This study provides a statistical treatment of the geochemistry of several microbialite-forming environments, as well as ‘control’ environments that do not form microbialtes. It is the aim of this manuscript to discern what characteristics are integral to the formation of microbialites.Hide
09 Jul 2015 Water use strategies of a young _Eucalyptus urophylla_ forest in response to seasonal change of climatic factors in SouthChina
Z. Z. Zhang, P. Zhao, R. Oren, H. R. McCarthy, J. F. Niu, L. W. Zhu, G. Y. Ni, and Y. Q. Huang Biogeosciences Discuss., 12, 10469–10510, https://doi.org/10.5194/bgd-12-10469-2015,https://doi.org/10.5194/bgd-12-10469-2015,2015
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
a) More dramatically decreased hydralic conductivity when stomatal conductance was decreasing may shed some light on the mechanism of the high WUE of Eucalyptus when exposed to drought conditions. b) As tree grows, ks is more sensitive to water loss. c) The decrease in stomatal sensitivity of GSref to D along the radiation gradient accounted for an important aspect of “plastic characteristics” for E. urophylla.Hide
08 Jul 2015 Net ecosystem production in a Little Ice Age moraine: the role of plant functional traits E. Varolo, D. Zanotelli, M. Tagliavini, S. Zerbe, and L. Montagnani Biogeosciences Discuss., 12, 10271–10310, https://doi.org/10.5194/bgd-12-10271-2015,https://doi.org/10.5194/bgd-12-10271-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Vegetation growth after glaciers retreat can be an important feedback to increasing atmospheric CO2. We monitored, with transparent and opaque chambers, the carbon fluxes of two vegetation communities on an alpine glacier forefield over two growing seasons. We showed that different plant physiology determines the sign of the net carbon exchange. A C3 grassland, having higher assimilation rates, was a net CO2 sink, while CAM rosettes were a net source.Hide
16 Jun 2015 Reviews and synthesis: Carbon capture and storage monitoring – an integrated biological, biophysical and chemicalapproach
N. Hicks, U. Vik, P. Taylor, E. Ladoukakis, J. Park, F. Kolisis, H. Stahl, and K. S. Jakobsen Biogeosciences Discuss., 12, 8909–8937, https://doi.org/10.5194/bgd-12-8909-2015,https://doi.org/10.5194/bgd-12-8909-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Here we review current knowledge about the impact of CO2 leaks from marine carbon capture storage sites, and use a recent case study to assess current monitoring techniques. We integrate aspects of microbiology, geophysics, chemistry and bioinformatics to suggest a future integrative monitoring technique, using metagenomics, to prevent large-scale leakages and associated consequences. This novel approach is generic and can be adapted to other systems of interest for environmental monitoring.Hide
08 Jun 2015 Ideas and perspectives: use of tree-ring width as an indicator of tree growth R. A. Hember, W. A. Kurz, and J. M. Metsaranta Biogeosciences Discuss., 12, 8341–8352, https://doi.org/10.5194/bgd-12-8341-2015,https://doi.org/10.5194/bgd-12-8341-2015,2015
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
By coring trees, studies can reconstruct growth over the lifespan of a tree. This provides unparalleled sampling of temporal variation of growth. However, many studies focus on the variation of annual ring width. With increasing prevalence of such studies in global change science, we caution that ring width is not directly comparable with primary productivity of the tree and advocate a straightforward solution to facilitate comparison between studies.Hide
02 Jun 2015 Biologically labile photoproducts from riverine non-labile dissolved organic carbon in the coastal waters V. Kasurinen, H. Aarnos, and A. Vähätalo Biogeosciences Discuss., 12, 8199–8234, https://doi.org/10.5194/bgd-12-8199-2015,https://doi.org/10.5194/bgd-12-8199-2015,2015
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Irradiations of filtered water samples from ten major rivers stimulated bacterial production and respiration. The stimulus depended on photobleaching of chromophoric dissolved organic matter (CDOM). Assuming complete photobleaching of CDOM in the global coastal ocean, sunlight-induced photochemical reactions transform >15% (>38 Mt yr-1) of riverine dissolved organic carbon flux into biologically labile photoproducts, which are consumed by bacteria with 13% growthefficiency.
Hide
12 May 2015 Methane distribution, flux, and budget in the East ChinaSea and Yellow Sea
M.-S. Sun, G.-L. Zhang, X.-P. Cao, X.-Y. Mao, J. Li, and W.-W. Ye Biogeosciences Discuss., 12, 7017–7053, https://doi.org/10.5194/bgd-12-7017-2015,https://doi.org/10.5194/bgd-12-7017-2015,2015
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
Obvious seasonal variations of the distribution and emission of methane in the ECS and YS were reported based on data collected during five cruises in 2011. A box model was used to calculate the methane budget in the ECS, identify the main sources and sinks of dissolved methane in this area, and estimate the contribution of different sources to total methane quantitatively. It indicated that the most important source of methane in the ECS was in situ production in thewater column.
Hide
30 Apr 2015 Coupling the chemical dynamics of carbonate and dissolved inorganic nitrogen systems in the eutrophic and turbid inner Changjiang (Yangtze River) Estuary W.-D. Zhai and X.-L. Yan Biogeosciences Discuss., 12, 6405–6443, https://doi.org/10.5194/bgd-12-6405-2015,https://doi.org/10.5194/bgd-12-6405-2015,2015
Manuscript not accepted for further review (discussion: closed, 4comments)
20 Apr 2015 Optimising methodology for determining the effect of ocean acidification on bacterial extracellular enzymes T. J. Burrell, E. W. Maas, P. Teesdale-Spittle, and C. S. Law Biogeosciences Discuss., 12, 5841–5870, https://doi.org/10.5194/bgd-12-5841-2015,https://doi.org/10.5194/bgd-12-5841-2015,2015
Manuscript not accepted for further review (discussion: closed, 4 comments) Short summaryShort summary
pH has a significant effect on the artificial fluorophore for glucosidase and protease activity, while artificial aminopeptidase substrate alters the pH of seawater. Reduction of coastal seawater pH to 7.8 was shown to increase β-glucosidase activity rapidly (0.5h), while no significant response was detected for leucine aminopeptidase. Seawater acidified by bubbling CO2 gas resulted in elevated β-glucosidase activity and bacterial cell numbers, although seasonal effects were observed.Hide
14 Apr 2015 Linking dissolved organic matter composition to metal bioavailability in agricultural soils: effect of anionic surfactants M. C. Hernandez-Soriano and J. C. Jimenez-Lopez Biogeosciences Discuss., 12, 5697–5723, https://doi.org/10.5194/bgd-12-5697-2015,https://doi.org/10.5194/bgd-12-5697-2015,2015
Revised manuscript not accepted (discussion: closed, 7 comments) Shortsummary
Short summary
Irrigation with greywater can increase the risk of metal toxicity to plants and soil organisms due to the presence of anionic surfactants derived from household products. Three agricultural soils were treated with anionic surfactants and the total concentration of soluble metal increased. However, that was accompanied by the solubilisation of soil organic compounds that bind metals and yield complexes of low bioavailability, which substantially reduces the potential risk ofmetal toxicity.
Hide
14 Apr 2015 Effects of flooding on organic carbon consumption in theEast China Sea
C.-C. Chen, G.-C. Gong, W.-C. Chou, C.-C. Chung, F.-K. Shiah, andK.-P. Chiang
Biogeosciences Discuss., 12, 5609–5639, https://doi.org/10.5194/bgd-12-5609-2015,https://doi.org/10.5194/bgd-12-5609-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) 14 Apr 2015 Estimation of nutrient contributions from the ocean across a river basin using stable isotope analysis K. Nakayama, Y. Maruya, K. Matsumoto, M. Komata, K. Komai, and T.Kuwae
Biogeosciences Discuss., 12, 5535–5557, https://doi.org/10.5194/bgd-12-5535-2015,https://doi.org/10.5194/bgd-12-5535-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Recycling of total nitrogen (TN) from the ocean to river basin ecosystems has been actively investigated. Previous studies demonstrated that marine-derived nutrients (MDN) play a large role in river ecosystems. However, little research has been devoted to understanding the contribution of runs of salmon to MDN across the entire river basin. Therefore we conducted field experiments to understand the recycling of TN from the ocean across an entire river basin using stable isotope analysis.Hide
13 Apr 2015 Is average chain length of plant lipids a potential proxy for vegetation, environment and climate changes? M. Wang, W. Zhang, and J. Hou Biogeosciences Discuss., 12, 5477–5501, https://doi.org/10.5194/bgd-12-5477-2015,https://doi.org/10.5194/bgd-12-5477-2015,2015
Revised manuscript not accepted (discussion: closed, 6 comments) 23 Mar 2015 A model analysis of climate and CO2 controls on tree growth in a semi-arid woodland G. Li, S. P. Harrison, and I. C. Prentice Biogeosciences Discuss., 12, 4769–4800, https://doi.org/10.5194/bgd-12-4769-2015,https://doi.org/10.5194/bgd-12-4769-2015,2015
Revised manuscript has not been submitted (discussion: closed, 3comments)
16 Mar 2015 Major constrains of the pelagic food web efficiency in the Mediterranean Sea L. Zoccarato and S. Fonda Umani Biogeosciences Discuss., 12, 4365–4403, https://doi.org/10.5194/bgd-12-4365-2015,https://doi.org/10.5194/bgd-12-4365-2015,2015
Revised manuscript not accepted (discussion: closed, 8 comments) Shortsummary
Short summary
The paper deals with the possible constrains that can control carbon fluxes in the Mediterranean Sea and affect the microbial part of the pelagic marine food webs. It is a synthesis and elaboration of more than 80 experiments of predations carried out in the whole Mediterranean Sea and that cover a wide range of trophic conditions. One of the main result is that always microzooplankton feed on prokaryotic components also in eutrophic conditions when of courseherbivory prevails.
Hide
10 Feb 2015 Growth and production of the copepod community in the southern area of the Humboldt Current System R. Escribano, E. Bustos-Ríos, P. Hidalgo, and C. E. Morales Biogeosciences Discuss., 12, 3057–3099, https://doi.org/10.5194/bgd-12-3057-2015,https://doi.org/10.5194/bgd-12-3057-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Increasing coastal upwelling in the Humboldt Current is negatively affecting zooplankton biomass and secondary production, as reflected in a gradual decrease in copepod biomass in recent years. A more extended upwelling period causes substantial loss of copepod biomass from the coastal zone due to offshore advection. Excess of upwelling, induced by climate change, may thus negatively impact biological production at lower trophic levels in this highly productive largemarine ecosystem.
Hide
03 Feb 2015 Relationship between N : P : Si ratio and phytoplankton community composition in a tropical estuarine mangrove ecosystem A. K. Choudhury and P. Bhadury Biogeosciences Discuss., 12, 2307–2355, https://doi.org/10.5194/bgd-12-2307-2015,https://doi.org/10.5194/bgd-12-2307-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
The present work aims at understanding importance of Brzezinski-Redfield ratio as a determinant of natural phytoplankton community composition in a mangrove ecosystem. Results show that nutrient concentrations were intricately balanced that never became limited and complemented well with concept of modified Redfield ratio in study area. Based on microscopy and rbcL sequencing, we show recent concepts of phytoplankton functional traits and elemental stoichiometry also occur in mangrove habitat.Hide
30 Jan 2015 Microbial communities responsible for fixation of CO2 revealed by using _mcrA_, _cbbM_, _cbbL_, _fthfs_, _fefe-hydrogenase_ genes as molecular biomarkers in petroleum reservoirs of differenttemperatures
J.-F. Liu, S. M. Mbadinga, X.-B. Sun, G.-C. Yang, S.-Z. Yang, J.-D.Gu, and B.-Z. Mu
Biogeosciences Discuss., 12, 1875–1906, https://doi.org/10.5194/bgd-12-1875-2015,https://doi.org/10.5194/bgd-12-1875-2015,2015
Revised manuscript not accepted (discussion: closed, 5 comments) 23 Jan 2015 Seasonality of sea ice controls interannual variability of summertime ΩA at the ice shelf in the Eastern Weddell Sea – an ocean acidification sensitivity study A. Weeber, S. Swart, and P. M. S. Monteiro Biogeosciences Discuss., 12, 1653–1687, https://doi.org/10.5194/bgd-12-1653-2015,https://doi.org/10.5194/bgd-12-1653-2015,2015
Revised manuscript not accepted (discussion: closed, 8 comments) Shortsummary
Short summary
As anthropogenic CO2 increases and sea ice dynamics change with climate, understanding the trend in these characteristics of variability in the seasonal drivers of ΩA will become increasingly important. We investigate the major drivers of interannual to seasonal scale variability of ΩA. We show that the critical climate (physical-biogeochemical) sensitivities for ΩA at the Antarctic ice self are the timing and rate of sea ice thaw and the resulting onset and persistence of phytoplankton blooms.Hide
16 Jan 2015 Primary productivity and its correlation with rainfall onAldabra Atoll
J. Shekeine, L. A. Turnbull, P. Cherubini, R. de Jong, R. Baxter, D. Hansen, N. Bunbury, F. Fleischer-Dogley, and G. Schaepman-Strub Biogeosciences Discuss., 12, 981–1013, https://doi.org/10.5194/bgd-12-981-2015,https://doi.org/10.5194/bgd-12-981-2015,2015
Preprint withdrawn (discussion: closed, 4 comments) 15 Jan 2015 How can effect the synergy of climate change, soil units and vegetation groups the potential global distribution of plants up to 2300: a modelling study for prediction of potential global distribution and migration of the N2 fixing species _Alnus_ spp.A. Sakalli
Biogeosciences Discuss., 12, 815–864, https://doi.org/10.5194/bgd-12-815-2015,https://doi.org/10.5194/bgd-12-815-2015,2015
Revised manuscript not accepted (discussion: closed, 4 comments) 13 Jan 2015 Inter- and intra-specific responses of coccolithophores to CO2-induced ocean acidification D. S. Wang, D. Xu, X. Fan, N. H. Ye, W. Q. Wang, X. W. Zhang, Y. Miao, Z. Guan, and S. Wang Biogeosciences Discuss., 12, 675–706, https://doi.org/10.5194/bgd-12-675-2015,https://doi.org/10.5194/bgd-12-675-2015,2015
Revised manuscript has not been submitted (discussion: closed, 3comments)
08 Jan 2015 Ba, B, and U element partitioning in magnesian calcite skeletons of Octocorallia corals T. Yoshimura, A. Suzuki, and N. Iwasaki Biogeosciences Discuss., 12, 413–444, https://doi.org/10.5194/bgd-12-413-2015,https://doi.org/10.5194/bgd-12-413-2015,2015
Revised manuscript not accepted (discussion: closed, 3 comments) Shortsummary
Short summary
The variations of element profiles in biogenic CaCO3 are widely used for identifying differences in biological and physicochemical processes associated with element partitioning. Octocorallia coral skeletons can provide long-term records of environmental conditions in intermediate and deep waters. The change in skeletal Ba/Ca with depth parallels that in the dissolved Ba concentration being linked to ocean nutrient cycling. We did not observe pronounced environmental controlsin B/Ca and U/Ca.
Hide
08 Jan 2015 Mechanism of O and C isotope fractionation in magnesian calcite skeletons of _Octocorallia_ corals and an implication on their calcification response to ocean acidification T. Yoshimura, A. Suzuki, and N. Iwasaki Biogeosciences Discuss., 12, 389–412, https://doi.org/10.5194/bgd-12-389-2015,https://doi.org/10.5194/bgd-12-389-2015,2015
Revised manuscript not accepted (discussion: closed, 3 comments) Shortsummary
Short summary
Skeletal oxygen and carbon isotope fractionation of Octocorallia corals, composed of more soluble calcium carbonate polymorphs of high-Mg calcite, represent a natural laboratory for the study of the response of coral calcification to pH changes. Skeletal isotopic compositions are enriched in light isotopes when conditions are less alkaline, suggsting an even stronger biological manipulation on the sources of dissolved inorganic carbon (DIC) under lower pH.Hide
19 Dec 2014 A study of the role of wetlands in defining spatial patterns of near-surface (top 1 m) soil carbon in the NorthernLatitudes
E. M. Blyth, R. Oliver, and N. Gedney Biogeosciences Discuss., 11, 17967–18002, https://doi.org/10.5194/bgd-11-17967-2014,https://doi.org/10.5194/bgd-11-17967-2014,2014
Revised manuscript has not been submitted (discussion: closed, 6 comments) Short summaryShort summary
By studying patterns of soil carbon in the Northern Latitudes alongside vegetation, soil temperatures and wetlands, it is apparent that the main cause of high values of soil carbon is the presence of saturated soils (wetlands). This link can only be modelled if the wetlands are assumed to completely suppress soil respiration. It is important to be able to model wetlands and their effect on soil carbon if we are to understand the long term future of the soil-carbon store in Northern Latitudes.Hide
17 Dec 2014 Rapid establishment of the CO2 sink associated with Kerguelen's bloom observed during the KEOPS2/OISO20 cruise C. Lo Monaco, N. Metzl, F. D'Ovidio, J. Llort, and C. Ridame Biogeosciences Discuss., 11, 17543–17578, https://doi.org/10.5194/bgd-11-17543-2014,https://doi.org/10.5194/bgd-11-17543-2014,2014
Revised manuscript has not been submitted (discussion: closed, 4comments)
10 Dec 2014 Nitrogen fixation in the Southern Ocean: a case of study of the Fe-fertilized Kerguelen region (KEOPS II cruise) M. L. González, V. Molina, L. Florez-Leiva, L. Oriol, A. J. Cavagna, F. Dehairs, L. Farias, and C. Fernandez Biogeosciences Discuss., 11, 17151–17185, https://doi.org/10.5194/bgd-11-17151-2014,https://doi.org/10.5194/bgd-11-17151-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
This study shows for first time N2 fixation is occurring in the HNLC area of Southern Ocean and in naturally iron-fertilized waters, at rates exceeding previous reports for high latitudes (up to 20.11 nmol N L-1 d-1). Diazotrophs were identified as heterotrophic bacterioplankton; with an indirect role of dFe in the regulation of this process. Fertilization enhancing regenerated primary production may control N2 fixation via the availability od DOM for heterotrophicbacterioplankton.
Hide
28 Nov 2014 Recycling and fluxes of carbon gases in a stratified boreal lake following experimental carbon addition H. Nykänen, S. Peura, P. Kankaala, and R. I. Jones Biogeosciences Discuss., 11, 16447–16495, https://doi.org/10.5194/bgd-11-16447-2014,https://doi.org/10.5194/bgd-11-16447-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) Shortsummary
Short summary
Boreal stratified lakes are important sources of GHG gases to the atmosphere. We found methane consumption mainly from anoxic deeper water layers where methanotrophs turn most of the methane to carbon dioxide. Addition of carbon as cane sugar increased lake emissions further, even especially methane was recycled efficiently in the lake. Stable isotopic analyzes show that added carbon was transferred to carbon dioxide and methane in the lake bottom.Hide
18 Nov 2014 Environmental factors controlling lake diatom communities: a meta-analysis of published dataS. Blanco
Biogeosciences Discuss., 11, 15889–15909, https://doi.org/10.5194/bgd-11-15889-2014,https://doi.org/10.5194/bgd-11-15889-2014,2014
Manuscript not accepted for further review (discussion: closed, 3 comments) Short summaryShort summary
I re-analyze information published during the last decades concerning the effect of different environmental predictors on the structure of benthic diatom communities in world lakes, providing a scientific basis for the implementation of new paleoenvironmental inference models. I consider highly relevant the publication of this article in a widely known journal, provided the noticeable demand on paleolimnological meta-studies supporting the use of such biological proxies at a pancontinental scaleHide
07 Nov 2014 Technical Note: Artificial coral reef mesocosms for ocean acidification investigations J. Leblud, L. Moulin, A. Batigny, P. Dubois, and P. Grosjean Biogeosciences Discuss., 11, 15463–15505, https://doi.org/10.5194/bgd-11-15463-2014,https://doi.org/10.5194/bgd-11-15463-2014,2014
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
The design and evaluation of artificial mesocosms are presented in the context of a thirteen months experiment on the effects of ocean acidification on tropical coral reefs. Physico-chemical parameters (i.e. pH, pO2, total alkalinity, alkaline earth metals and nutrients) were successfully controlled. Daily pH variations were applied to approach field conditions. Artificial reef mesocosms leave enough degrees of freedom to the studied ecosystem to change and to acclimate to contrasted conditions.Hide
31 Oct 2014 Experimental drought induces short-term changes in soil functionality and microbial community structure after fire in a Mediterranean shrubland M. B. Hinojosa, A. Parra, V. A. Laudicina, and J. M. Moreno Biogeosciences Discuss., 11, 15251–15287, https://doi.org/10.5194/bgd-11-15251-2014,https://doi.org/10.5194/bgd-11-15251-2014,2014
Revised manuscript not accepted (discussion: closed, 6 comments) Shortsummary
Short summary
This manuscript reports the results of an experimental field study in which the joint effect of both fire and drought is tested. Drought modifies the short-term post-fire soil functionality and microbial community, in a fire-prone xeric ecosystem in which drought is projected to increase with climate change. This study allows to make a step forward on our integrated understanding of the processes underlying impacts of climate extremes in the recovery of ecosystemsafter fire.
Hide
22 Oct 2014 Analysis of water use strategies of the desert riparian forest plant community in inland rivers of two arid regions innorthwestern China
Y. N. Chen, W. H. Li, H. H. Zhou, Y. P. Chen, X. M. Hao, A. H. Fu, andJ. X. Ma
Biogeosciences Discuss., 11, 14819–14856, https://doi.org/10.5194/bgd-11-14819-2014,https://doi.org/10.5194/bgd-11-14819-2014,2014
Revised manuscript not accepted (discussion: closed, 5 comments) 13 Oct 2014 Influence of aeolian activities on the distribution of microbial abundance in glacier ice Y. Chen, X.-K. Li, J. Si, G.-J. Wu, L.-D. Tian, and S.-R. Xiang Biogeosciences Discuss., 11, 14531–14549, https://doi.org/10.5194/bgd-11-14531-2014,https://doi.org/10.5194/bgd-11-14531-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 02 Oct 2014 Nematode diversity, abundance and community structure 50 years after the formation of the volcanic island of Surtsey K. Ilieva-Makulec, B. Bjarnadottir, and B. D. Sigurdsson Biogeosciences Discuss., 11, 14239–14267, https://doi.org/10.5194/bgd-11-14239-2014,https://doi.org/10.5194/bgd-11-14239-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 29 Sep 2014 Dynamics of global atmospheric CO2 concentration from 1850 to 2010: a linear approximation W. Wang and R. Nemani Biogeosciences Discuss., 11, 13957–13983, https://doi.org/10.5194/bgd-11-13957-2014,https://doi.org/10.5194/bgd-11-13957-2014,2014
Revised manuscript not accepted (discussion: closed, 10 comments) 22 Sep 2014 Effect of ammonium input over the distribution of iron in the seawater and the phytoplankton in a mesocosm experiment in a NorthPatagonian fjord
N. Sanchez, M. V. Ardelan, N. Bizsel, and J. L. Iriarte Biogeosciences Discuss., 11, 13739–13774, https://doi.org/10.5194/bgd-11-13739-2014,https://doi.org/10.5194/bgd-11-13739-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 10 Sep 2014 Testing functional trait-based mechanisms underpinning plant responses to grazing and linkages to ecosystem functioning ingrasslands
S. X. Zheng, W. H. Li, Z. C. Lan, H. Y. Ren, K. B. Wang, and Y. F. Bai Biogeosciences Discuss., 11, 13157–13186, https://doi.org/10.5194/bgd-11-13157-2014,https://doi.org/10.5194/bgd-11-13157-2014,2014
Revised manuscript not accepted (discussion: closed, 6 comments) 15 Aug 2014 Are C-loss rates from drained peatlands constant over time? The additive value of soil profile based and flux budgetapproach
J. Leifeld, C. Bader, E. Borraz, M. Hoffmann, M. Giebels, M. Sommer,and J. Augustin
Biogeosciences Discuss., 11, 12341–12373, https://doi.org/10.5194/bgd-11-12341-2014,https://doi.org/10.5194/bgd-11-12341-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 07 Aug 2014 Volatile Organic Compound emissions from soil: using Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-TOF-MS) for the real time observation of microbial processes P. R. Veres, T. Behrendt, A. Klapthor, F. X. Meixner, and J. Williams Biogeosciences Discuss., 11, 12009–12038, https://doi.org/10.5194/bgd-11-12009-2014,https://doi.org/10.5194/bgd-11-12009-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 01 Aug 2014 Modelling the effect of soil moisture and organic matter degradation on biogenic NO emissions from soils in Sahel rangeland(Mali)
C. Delon, E. Mougin, D. Serça, M. Grippa, P. Hiernaux, M. Diawara, C. Galy-Lacaux, and L. Kergoat Biogeosciences Discuss., 11, 11785–11824, https://doi.org/10.5194/bgd-11-11785-2014,https://doi.org/10.5194/bgd-11-11785-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 31 Jul 2014 Emissions from potential Patagonian dust sources and associated biological response in the Atlantic sector of the SouthernOcean
A. Castagna, H. Evangelista, L. G. Tilstra, and R. Kerr Biogeosciences Discuss., 11, 11671–11699, https://doi.org/10.5194/bgd-11-11671-2014,https://doi.org/10.5194/bgd-11-11671-2014,2014
Revised manuscript not accepted (discussion: closed, 6 comments) 29 Jul 2014 A 1-D examination of decadal air–sea re-equilibration induced ocean surface anthropogenic CO2 accumulation: present status, changes from 1960s to 2000s, and future scenarios W.-D. Zhai and H.-D. Zhao Biogeosciences Discuss., 11, 11509–11532, https://doi.org/10.5194/bgd-11-11509-2014,https://doi.org/10.5194/bgd-11-11509-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 25 Jul 2014 Riding on the fast lane: how sea turtles behave in post-nesting migration Y.-H. Wang, I-J. Cheng, and L. Centurioni Biogeosciences Discuss., 11, 11481–11508, https://doi.org/10.5194/bgd-11-11481-2014,https://doi.org/10.5194/bgd-11-11481-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 11 Jul 2014 Evaluation of carbon stocks in above- and below-ground biomass in Central Africa: case study of Lesio-louna tropicalrainforest of Congo
X. Liu, R. Ekoungoulou, J. J. Loumeto, S. A. Ifo, Y. E. Bocko, and F.E. Koula
Biogeosciences Discuss., 11, 10703–10735, https://doi.org/10.5194/bgd-11-10703-2014,https://doi.org/10.5194/bgd-11-10703-2014,2014
Preprint withdrawn (discussion: closed, 3 comments) 27 Jun 2014 Structural analysis of three global land models on carbon cycle simulations using a traceability framework R. Rafique, J. Xia, O. Hararuk, and Y. Luo Biogeosciences Discuss., 11, 9979–10014, https://doi.org/10.5194/bgd-11-9979-2014,https://doi.org/10.5194/bgd-11-9979-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 17 Jun 2014 Performance evaluation of ocean color satellite models for deriving accurate chlorophyll estimates in the Gulf of SaintLawrence
M. Montes-Hugo, H. Bouakba, and R. Arnone Biogeosciences Discuss., 11, 9299–9340, https://doi.org/10.5194/bgd-11-9299-2014,https://doi.org/10.5194/bgd-11-9299-2014,2014
Revised manuscript not accepted (discussion: closed, 5 comments) 16 Jun 2014 Biomass yield development of early, medium and late Maize varieties under a future climate in Lower Saxony, Germany J. F. Degener and M. Kappas Biogeosciences Discuss., 11, 9103–9134, https://doi.org/10.5194/bgd-11-9103-2014,https://doi.org/10.5194/bgd-11-9103-2014,2014
Revised manuscript not accepted (discussion: closed, 6 comments) 06 Jun 2014 The Habitable Zone of Inhabited Planets J. I. Zuluaga, J. F. Salazar, P. Cuartas-Restrepo, and G. Poveda Biogeosciences Discuss., 11, 8443–8483, https://doi.org/10.5194/bgd-11-8443-2014,https://doi.org/10.5194/bgd-11-8443-2014,2014
Revised manuscript has not been submitted (discussion: closed, 2comments)
03 Jun 2014 Revisiting Mt. Kilimanjaro: Do n-alkane biomarkers in soils reflect the δ2H isotopic composition of precipitation? M. Zech, R. Zech, K. Rozanski, A. Hemp, G. Gleixner, and W. Zech Biogeosciences Discuss., 11, 7823–7852, https://doi.org/10.5194/bgd-11-7823-2014,https://doi.org/10.5194/bgd-11-7823-2014,2014
Preprint withdrawn (discussion: closed, 4 comments) 20 May 2014 Direct and indirect effects of vertical mixing, nutrients and ultraviolet radiation on the bacterioplankton metabolism in high-mountain lakes from southern Europe C. Durán, J. M. Medina-Sánchez, G. Herrera, M. Villar-Argaiz, V. E. Villafañe, E. W. Helbling, and P. Carrillo Biogeosciences Discuss., 11, 7291–7325, https://doi.org/10.5194/bgd-11-7291-2014,https://doi.org/10.5194/bgd-11-7291-2014,2014
Revised manuscript not accepted (discussion: closed, 3 comments) 20 May 2014 Role of extracellular polymeric substances (EPS) from _Pseudomonas putida_ strain MnB1 in dissolution of naturalrhodochrosite
H. Wang and X. Pan
Biogeosciences Discuss., 11, 7273–7290, https://doi.org/10.5194/bgd-11-7273-2014,https://doi.org/10.5194/bgd-11-7273-2014,2014
Revised manuscript not accepted (discussion: closed, 6 comments) 19 May 2014 Dissolved organic carbon concentrations vary with season and land use – investigations from two fens in Northeastern Germanyover two years
M. Schwalm and J. Zeitz Biogeosciences Discuss., 11, 7079–7111, https://doi.org/10.5194/bgd-11-7079-2014,https://doi.org/10.5194/bgd-11-7079-2014,2014
Preprint withdrawn (discussion: closed, 3 comments) 19 May 2014 Phylogenetic support for the Tropical Niche Conservatism Hypothesis despite the absence of a clear latitudinal species richness gradient in Yunnan's woody flora G. Tang, M. G. Zhang, C. Liu, Z. Zhou, W. Chen, and J. W. F. Slik Biogeosciences Discuss., 11, 7055–7077, https://doi.org/10.5194/bgd-11-7055-2014,https://doi.org/10.5194/bgd-11-7055-2014,2014
Revised manuscript has not been submitted (discussion: closed, 14comments)
16 May 2014 Progressive eutrophication behind the world-largest super floating macroalgal blooms in the Yellow Sea Q. Xing, M. Gao, X. Gao, L. Tosi, F. G. Schmitt, Y. Zhang, P. Shi, J.Wei, and Y. Luo
Biogeosciences Discuss., 11, 7029–7054, https://doi.org/10.5194/bgd-11-7029-2014,https://doi.org/10.5194/bgd-11-7029-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 12 May 2014 Surface currents and upwelling in Kerguelen Plateauregions
M. Zhou, Y. Zhu, F. d'Ovidio, Y.-H. Park, I. Durand, E. Kestenare, V. Sanial, P. Van-Beek, B. Queguiner, F. Carlotti, and S. Blain Biogeosciences Discuss., 11, 6845–6876, https://doi.org/10.5194/bgd-11-6845-2014,https://doi.org/10.5194/bgd-11-6845-2014,2014
Revised manuscript has not been submitted (discussion: closed, 2comments)
07 May 2014 Response of plant community composition and productivity to warming and nitrogen deposition in a temperate meadow ecosystem T. Zhang, R. Guo, S. Gao, J. X. Guo, and W. Sun Biogeosciences Discuss., 11, 6647–6672, https://doi.org/10.5194/bgd-11-6647-2014,https://doi.org/10.5194/bgd-11-6647-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 04 Apr 2014 Impacts of physical data assimilation on the Global OceanCarbonate System
L. Visinelli, S. Masina, M. Vichi, and A. Storto Biogeosciences Discuss., 11, 5399–5441, https://doi.org/10.5194/bgd-11-5399-2014,https://doi.org/10.5194/bgd-11-5399-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 03 Apr 2014 Trace elements in shells of common gastropods in the near vicinity of a natural CO2 vent: no evidence of pH-dependentcontamination
J. B. McClintock, C. D. Amsler, M. O. Amsler, A. Duquette, R. A. Angus, J. M. Hall-Spencer, and M. Milazzo Biogeosciences Discuss., 11, 5215–5237, https://doi.org/10.5194/bgd-11-5215-2014,https://doi.org/10.5194/bgd-11-5215-2014,2014
Revised manuscript has not been submitted (discussion: closed, 3comments)
01 Apr 2014 Distribution of ammonia oxidizers in relation to vegetation characteristics in the Qilian Mountains, northwestern China X. S. Tai, W. L. Mao, G. X. Liu, T. Chen, W. Zhang, X. K. Wu, H. Z. Long, B. G. Zhang, and T. P. Gao Biogeosciences Discuss., 11, 5123–5146, https://doi.org/10.5194/bgd-11-5123-2014,https://doi.org/10.5194/bgd-11-5123-2014,2014
Revised manuscript has not been submitted (discussion: closed, 8comments)
18 Mar 2014 The sensitivity of primary productivity to intra-seasonal mixed layer variability in the sub-Antarctic Zone of the AtlanticOcean
W. R. Joubert, S. Swart, A. Tagliabue, S. J. Thomalla, and P. M. S.Monteiro
Biogeosciences Discuss., 11, 4335–4358, https://doi.org/10.5194/bgd-11-4335-2014,https://doi.org/10.5194/bgd-11-4335-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 07 Mar 2014 Recolonization of the intertidal and shallow subtidal community following the 2008 eruption of Alaska's Kasatochi Volcano S. C. Jewett and G. S. Drew Biogeosciences Discuss., 11, 3799–3836, https://doi.org/10.5194/bgd-11-3799-2014,https://doi.org/10.5194/bgd-11-3799-2014,2014
Preprint withdrawn (discussion: closed, 2 comments) 20 Feb 2014 C, N and P stoichiometric mismatch between resources and consumers influence the dynamics of a marine microbial food web model and its response to atmospheric N and P inputs P. Pondaven, P. Pivière, C. Ridame, and C. Guien Biogeosciences Discuss., 11, 2933–2971, https://doi.org/10.5194/bgd-11-2933-2014,https://doi.org/10.5194/bgd-11-2933-2014,2014
Revised manuscript has not been submitted (discussion: closed, 2comments)
20 Feb 2014 Stable isotope ratio (13C/12C) mass spectrometry to evaluate carbon sources and sinks: changes and trends during the decomposition of vegetal debris from eucalyptus clone plantations (NWSpain)
I. Fernandez and A. Cabaneiro Biogeosciences Discuss., 11, 2823–2845, https://doi.org/10.5194/bgd-11-2823-2014,https://doi.org/10.5194/bgd-11-2823-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 14 Feb 2014 On the apparent CO2 absorption by alkaline soils X. Chen and W. F. Wang Biogeosciences Discuss., 11, 2665–2683, https://doi.org/10.5194/bgd-11-2665-2014,https://doi.org/10.5194/bgd-11-2665-2014,2014
Preprint withdrawn (discussion: closed, 2 comments) 04 Feb 2014 Challenges and opportunities to reduce uncertainty in projections of future atmospheric CO2: a combined marine and terrestrial biosphere perspective D. Dalmonech, A. M. Foley, A. Anav, P. Friedlingstein, A. D. Friend, M. Kidston, M. Willeit, and S. Zaehle Biogeosciences Discuss., 11, 2083–2153, https://doi.org/10.5194/bgd-11-2083-2014,https://doi.org/10.5194/bgd-11-2083-2014,2014
Revised manuscript has not been submitted (discussion: closed, 4comments)
04 Feb 2014 Impact of nitrogen fertilization on carbon and water fluxes in a chronosequence of three Douglas-fir stands in the PacificNorthwest
X. Dou, B. Chen, T. A. Black, R. S. Jassal, M. Che, and Y. Liu Biogeosciences Discuss., 11, 2001–2043, https://doi.org/10.5194/bgd-11-2001-2014,https://doi.org/10.5194/bgd-11-2001-2014,2014
Revised manuscript not accepted (discussion: closed, 8 comments) 04 Feb 2014 How well can we predict soil respiration with climate indicators, now and in the future? C. T. Berridge, L. H. Hadju, and A. J. Dolman Biogeosciences Discuss., 11, 1977–1999, https://doi.org/10.5194/bgd-11-1977-2014,https://doi.org/10.5194/bgd-11-1977-2014,2014
Revised manuscript not accepted (discussion: closed, 9 comments) 03 Feb 2014 Physical processes mediating climate change impacts on regional sea ecosystems J. Holt, C. Schrum, H. Cannaby, U. Daewel, I. Allen, Y. Artioli, L. Bopp, M. Butenschon, B. A. Fach, J. Harle, D. Pushpadas, B. Salihoglu,and S. Wakelin
Biogeosciences Discuss., 11, 1909–1975, https://doi.org/10.5194/bgd-11-1909-2014,https://doi.org/10.5194/bgd-11-1909-2014,2014
Revised manuscript not accepted (discussion: closed, 5 comments) 29 Jan 2014 A model–data intercomparison of simulated runoff in the contiguous United States: results from the North America Carbon Regional and Continental Interim-Synthesis C. R. Schwalm, D. N. Huntinzger, R. B. Cook, Y. Wei, I. T. Baker, R. P. Neilson, B. Poulter, P. Caldwell, G. Sun, H. Q. Tian, and N. Zeng Biogeosciences Discuss., 11, 1801–1826, https://doi.org/10.5194/bgd-11-1801-2014,https://doi.org/10.5194/bgd-11-1801-2014,2014
Revised manuscript not accepted (discussion: closed, 3 comments) 29 Jan 2014 Mechanisms for the suppression of methane production in peatland soils by a humic substance analog R. Ye, J. K. Keller, Q. Jin, B. J. M. Bohannan, and S. D. Bridgham Biogeosciences Discuss., 11, 1739–1771, https://doi.org/10.5194/bgd-11-1739-2014,https://doi.org/10.5194/bgd-11-1739-2014,2014
Revised manuscript not accepted (discussion: closed, 4 comments) 23 Jan 2014 Future climate variability impacts on potential erosion and soil organic carbon in European croplands M. van der Velde, J. Balkovič, C. Beer, N. Khabarov, M. Kuhnert, M. Obersteiner, R. Skalský, W. Xiong, and P. Smith Biogeosciences Discuss., 11, 1561–1585, https://doi.org/10.5194/bgd-11-1561-2014,https://doi.org/10.5194/bgd-11-1561-2014,2014
Revised manuscript not accepted (discussion: closed, 5 comments) 16 Jan 2014 The effect of land-use change on the net exchange rates of greenhouse gases: a meta-analytical approach D.-G. Kim and M. U. F. Kirschbaum Biogeosciences Discuss., 11, 1053–1095, https://doi.org/10.5194/bgd-11-1053-2014,https://doi.org/10.5194/bgd-11-1053-2014,2014
Revised manuscript not accepted (discussion: closed, 6 comments) 15 Jan 2014 Controls on pH in surface waters of northwestern Europeanshelf seas
V. M. C. Rérolle, M. Ribas-Ribas, V. Kitidis, I. Brown, D. C. E. Bakker, G. A. Lee, T. Shi, M. C. Mowlem, and E. P. Achterberg Biogeosciences Discuss., 11, 943–974, https://doi.org/10.5194/bgd-11-943-2014,https://doi.org/10.5194/bgd-11-943-2014,2014
Preprint retracted (discussion: closed, 2 comments) 13 Jan 2014 Magnetic quantification of Fe and S bound as magnetosomal greigite in laminated sapropels in deeper basins of the Baltic Sea M. Reinholdsson and I. Snowball Biogeosciences Discuss., 11, 729–752, https://doi.org/10.5194/bgd-11-729-2014,https://doi.org/10.5194/bgd-11-729-2014,2014
Revised manuscript not accepted (discussion: closed, 3 comments) 17 Dec 2013 Impacts of a weather event on shelf circulation and CO2 and O2 dynamics on the Louisiana shelf during summer 2009 W.-J. Huang, W.-J. Cai, Y. Wang, and C. S. Hopkinson Biogeosciences Discuss., 10, 19867–19893, https://doi.org/10.5194/bgd-10-19867-2013,https://doi.org/10.5194/bgd-10-19867-2013,2013
Revised manuscript has not been submitted (discussion: closed, 3comments)
17 Dec 2013 Global land-atmosphere exchange of methane and nitrous oxide: magnitude and spatiotemporal patterns H. Tian, G. Chen, C. Lu, X. Xu, W. Ren, K. Banger, B. Zhang, B. Tao, S. Pan, M. Liu, and C. Zhang Biogeosciences Discuss., 10, 19811–19865, https://doi.org/10.5194/bgd-10-19811-2013,https://doi.org/10.5194/bgd-10-19811-2013,2013
Revised manuscript has not been submitted (discussion: closed, 3comments)
13 Dec 2013 The role of iron species on the competition of two coastal diatoms, _Skeletonema costatum_ and _Thalassosira weissflogii_ S.-X. Li, F.-J. Liu, F.-Y. Zheng, Y.-G. Zuo, and X.-G. Huang Biogeosciences Discuss., 10, 19603–19631, https://doi.org/10.5194/bgd-10-19603-2013,https://doi.org/10.5194/bgd-10-19603-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 09 Dec 2013 Effects of mowing on N2O emission from a temperate grassland in Inner Mongolia, Northern China L. Zhang, Q. Wang, H. J. Laanbroek, C. Wang, D. Guo, and L. Li Biogeosciences Discuss., 10, 19219–19243, https://doi.org/10.5194/bgd-10-19219-2013,https://doi.org/10.5194/bgd-10-19219-2013,2013
Revised manuscript not accepted (discussion: closed, 6 comments) 25 Nov 2013 Methane production correlates positively with methanogens, sulfate-reducing bacteria and pore water acetate at an estuarine brackish-marsh landscape scale C. Tong, C. X. She, Y. F. Jin, P. Yang, and J. F. Huang Biogeosciences Discuss., 10, 18241–18275, https://doi.org/10.5194/bgd-10-18241-2013,https://doi.org/10.5194/bgd-10-18241-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 22 Nov 2013 Technical Note: Constraining stable carbon isotope values of microphytobenthos (C3 photosynthesis) in the Arctic for applicationto food web studies
L. E. Oxtoby, J. T. Mathis, L. W. Juranek, and M. J. Wooller Biogeosciences Discuss., 10, 18151–18174, https://doi.org/10.5194/bgd-10-18151-2013,https://doi.org/10.5194/bgd-10-18151-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 21 Nov 2013 Stable soil organic carbon is positively linked to microbial-derived compounds in four plantations of subtropical China H. Wang, S. Liu, S. X. Chang, J. Wang, Z. Shi, X. Huang, Y. Wen, L.Lu, and D. Cai
Biogeosciences Discuss., 10, 18093–18119, https://doi.org/10.5194/bgd-10-18093-2013,https://doi.org/10.5194/bgd-10-18093-2013,2013
Revised manuscript not accepted (discussion: closed, 6 comments) 12 Nov 2013 Late holocene trends of phytoplankton productivity and anoxia as inferred from diatom and geochemical proxies in Lake Victoria, Eastern Africa M. Andama, J. B. Lejju, and C. U. Tolo Biogeosciences Discuss., 10, 17663–17682, https://doi.org/10.5194/bgd-10-17663-2013,https://doi.org/10.5194/bgd-10-17663-2013,2013
Preprint withdrawn (discussion: closed, 2 comments) 04 Nov 2013 Plankton community response to Saharan dust fertilization in subtropical waters off the Canary Islands G. Franchy, A. Ojeda, J. López-Cancio, and S. Hernández-León Biogeosciences Discuss., 10, 17275–17307, https://doi.org/10.5194/bgd-10-17275-2013,https://doi.org/10.5194/bgd-10-17275-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 04 Nov 2013 The distribution, dominance patterns and ecological niches of plankton functional types in Dynamic Green Ocean Models andsatellite estimates
M. Vogt, T. Hashioka, M. R. Payne, E. T. Buitenhuis, C. Le Quéré, S. Alvain, M. N. Aita, L. Bopp, S. C. Doney, T. Hirata, I. Lima, S. Sailley, and Y. Yamanaka Biogeosciences Discuss., 10, 17193–17247, https://doi.org/10.5194/bgd-10-17193-2013,https://doi.org/10.5194/bgd-10-17193-2013,2013
Revised manuscript has not been submitted (discussion: closed, 2comments)
24 Oct 2013 Exploring the response of West Siberian wetland methane emissions to future changes in climate, vegetation, and soil microbialcommunities
T. J. Bohn and D. P. Lettenmaier Biogeosciences Discuss., 10, 16329–16369, https://doi.org/10.5194/bgd-10-16329-2013,https://doi.org/10.5194/bgd-10-16329-2013,2013
Preprint withdrawn (discussion: closed, 4 comments) 22 Oct 2013 Characteristics and assessment of biogenic phosphorus in sediments from the multi-polluted Haihe River, China, using phosphorus fractionation and phosphorus-31 nuclear magnetic resonance (31P-NMR) W. Q. Zhang, H. Zhang, W. Z. Tang, and B. Q. Shan Biogeosciences Discuss., 10, 16269–16294, https://doi.org/10.5194/bgd-10-16269-2013,https://doi.org/10.5194/bgd-10-16269-2013,2013
Preprint withdrawn (discussion: closed, 3 comments) 22 Oct 2013 Evolution of cyclonic eddies and biogenic fluxes in the northern Bay of Bengal M. Nuncio and S. Prasanna Kumar Biogeosciences Discuss., 10, 16213–16236, https://doi.org/10.5194/bgd-10-16213-2013,https://doi.org/10.5194/bgd-10-16213-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 18 Oct 2013 Extreme dissolved organic nitrogen fluxes in the human impacted Pamba River, Kerala, India S. Elizabeth David and T. C. Jennerjahn Biogeosciences Discuss., 10, 16137–16171, https://doi.org/10.5194/bgd-10-16137-2013,https://doi.org/10.5194/bgd-10-16137-2013,2013
Revised manuscript has not been submitted (discussion: closed, 4comments)
11 Oct 2013 Recovery dynamics and invasibility of herbaceous plant communities after exposure to fifty-year climate extremes in differentseasons
F. E. Dreesen, H. J. De Boeck, I. A. Janssens, and I. Nijs Biogeosciences Discuss., 10, 15851–15877, https://doi.org/10.5194/bgd-10-15851-2013,https://doi.org/10.5194/bgd-10-15851-2013,2013
Revised manuscript not accepted (discussion: closed, 3 comments) 13 Sep 2013 The coccolithophores _Emiliania huxleyi_ and _Coccolithus pelagicus_: extant populations from the Norwegian-Iceland Sea and FramStrait
C. V. Dylmer, J. Giraudeau, V. Hanquiez, and K. Husum Biogeosciences Discuss., 10, 15077–15106, https://doi.org/10.5194/bgd-10-15077-2013,https://doi.org/10.5194/bgd-10-15077-2013,2013
Revised manuscript has not been submitted (discussion: closed, 4comments)
05 Sep 2013 Mechanism for initiation of the offshore phytoplankton bloom in the Taiwan Strait during winter: a physical–biological coupled modeling study J. Wang, H. Hong, Y. Jiang, and X.-H. Yan Biogeosciences Discuss., 10, 14685–14714, https://doi.org/10.5194/bgd-10-14685-2013,https://doi.org/10.5194/bgd-10-14685-2013,2013
Revised manuscript not accepted (discussion: closed, 6 comments) 07 Aug 2013 A~simple model for predicting the global distribution of the N2 fixing host genus _Alnus Mill._: impact of climate change on the global distribution in 2100A. Sakalli
Biogeosciences Discuss., 10, 13049–13095, https://doi.org/10.5194/bgd-10-13049-2013,https://doi.org/10.5194/bgd-10-13049-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 07 Aug 2013 Response of ecosystem respiration to experimental warming and clipping in Tibetan alpine meadow at three elevations G. Fu, Y.-J. Zhang, X.-Z. Zhang, P.-L. Shi, Y.-T. Zhou, Y.-L. Li, andZ.-X. Shen
Biogeosciences Discuss., 10, 13015–13047, https://doi.org/10.5194/bgd-10-13015-2013,https://doi.org/10.5194/bgd-10-13015-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 07 Aug 2013 Assessing the relationship between the _δ_18O signatures of siliceous sponge spicules and water in a~tropical lacustrine environment (Minas Gerais, Brazil) M. C. Matteuzzo, A. Alexandre, A. F. D. C. Varajão, C. Volkmer-Ribeiro, A. C. S. Almeida, C. A. C. Varajão, C. Vallet-Coulomb, C. Sonzogni, and H. Miche Biogeosciences Discuss., 10, 12887–12918, https://doi.org/10.5194/bgd-10-12887-2013,https://doi.org/10.5194/bgd-10-12887-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 26 Jul 2013 Physical-biological interactions to the west of Hawaiian Islands: impact of submesoscale dynamics on biological productivityP. Xiu and F. Chai
Biogeosciences Discuss., 10, 12529–12549, https://doi.org/10.5194/bgd-10-12529-2013,https://doi.org/10.5194/bgd-10-12529-2013,2013
Preprint withdrawn (discussion: closed, 3 comments) 22 Jul 2013 Modelling the population dynamics of _Temora longicornis_ in the Basin Gdańsk (southern Baltic Sea) L. Dzierzbicka-Glowacka, A. Lemieszek, M. Kalarus, and I. M.Żmijewska
Biogeosciences Discuss., 10, 12347–12384, https://doi.org/10.5194/bgd-10-12347-2013,https://doi.org/10.5194/bgd-10-12347-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 19 Jul 2013 Absorption features of chromophoric dissolved organic matter (CDOM) and tracing implication for dissolved organic carbon (DOC) in Changjiang Estuary, China X. Y. Zhang, X. Chen, H. Deng, Y. Du, and H. Y. Jin Biogeosciences Discuss., 10, 12217–12250, https://doi.org/10.5194/bgd-10-12217-2013,https://doi.org/10.5194/bgd-10-12217-2013,2013
Preprint withdrawn (discussion: closed, 3 comments) 19 Jul 2013 Photophysiological state of natural phytoplankton communities in the South China Sea and Sulu Sea W. Cheah, B. B. Taylor, S. Wiegmann, S. Raimund, G. Krahmann, B. Quack, and A. Bracher Biogeosciences Discuss., 10, 12115–12153, https://doi.org/10.5194/bgd-10-12115-2013,https://doi.org/10.5194/bgd-10-12115-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 16 Jul 2013 Nutrient dynamics along a precipitation gradient in European beech forests I. C. Meier and C. Leuschner Biogeosciences Discuss., 10, 11899–11933, https://doi.org/10.5194/bgd-10-11899-2013,https://doi.org/10.5194/bgd-10-11899-2013,2013
Revised manuscript not accepted (discussion: closed, 3 comments) 15 Jul 2013 Diagenesis and benthic fluxes of nutrients and metals during experimentally induced anoxia in the Gulf of Trieste (northernAdriatic Sea)
N. Koron, N. Ogrinc, E. Metzger, B. Riedel, and J. Faganeli Biogeosciences Discuss., 10, 11729–11755, https://doi.org/10.5194/bgd-10-11729-2013,https://doi.org/10.5194/bgd-10-11729-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 09 Jul 2013 Sensitivity of pelagic CaCO3 dissolution to ocean acidification in an ocean biogeochemical model A. Regenberg, B. Schneider, and R. Gangstø Biogeosciences Discuss., 10, 11343–11373, https://doi.org/10.5194/bgd-10-11343-2013,https://doi.org/10.5194/bgd-10-11343-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 08 Jul 2013 Temperature and phytoplankton cell size regulate carbon uptake and carbon overconsumption in the ocean S. E. Craig, H. Thomas, C. T. Jones, W. K. W. Li, B. J. W. Greenan, E. H. Shadwick, and W. J. Burt Biogeosciences Discuss., 10, 11255–11282, https://doi.org/10.5194/bgd-10-11255-2013,https://doi.org/10.5194/bgd-10-11255-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 27 Jun 2013 Eddy- and wind-sustained moderate primary productivity in the temperate East Sea (Sea of Japan) G.-H. Hong, D.-K. Lee, D.-B. Yang, Y. I. Kim, J.-H. Park, and C.-H.Park
Biogeosciences Discuss., 10, 10429–10458, https://doi.org/10.5194/bgd-10-10429-2013,https://doi.org/10.5194/bgd-10-10429-2013,2013
Preprint withdrawn (discussion: closed, 2 comments) 26 Jun 2013 Contribution of dinitrogen fixation to bacterial and primary productivity in the Gulf of Aqaba (Red Sea) E. Rahav, B. Herut, M. R. Mulholland, B. Voß, D. Stazic, C. Steglich, W. R. Hess, and I. Berman-Frank Biogeosciences Discuss., 10, 10327–10361, https://doi.org/10.5194/bgd-10-10327-2013,https://doi.org/10.5194/bgd-10-10327-2013,2013
Revised manuscript has not been submitted (discussion: closed, 2comments)
20 Jun 2013 Partial pressure of CO2 and CO2 emission in a monsoon-driven hydroelectric reservoir (Danjiangkou Reservoir), China S. Y. Li and Q. F. Zhang Biogeosciences Discuss., 10, 10055–10094, https://doi.org/10.5194/bgd-10-10055-2013,https://doi.org/10.5194/bgd-10-10055-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 19 Jun 2013 Forward modeling analysis of regional scale tree-ring patterns around the northeastern Tibetan Plateau, Northwest China X. Gou, F. Zhou, Y. Zhang, Q. Chen, and J. Zhang Biogeosciences Discuss., 10, 9969–9988, https://doi.org/10.5194/bgd-10-9969-2013,https://doi.org/10.5194/bgd-10-9969-2013,2013
Revised manuscript has not been submitted (discussion: closed, 2comments)
14 May 2013 Fertilization success of an arctic sea urchin species, _Strongylocentrotus_ _droebachiensis_ (O. F. Müller, 1776) under CO2-induced ocean acidification D. Bögner, U. Bickmeyer, and A. Köhler Biogeosciences Discuss., 10, 8027–8064, https://doi.org/10.5194/bgd-10-8027-2013,https://doi.org/10.5194/bgd-10-8027-2013,2013
Revised manuscript not accepted (discussion: closed, 7 comments) 29 Apr 2013 Effects of ocean acidification on the larval growth of olive flounder (_Paralichthys olivaceus_) K.-S. Kim, J. H. Shim, and S. Kim Biogeosciences Discuss., 10, 7413–7431, https://doi.org/10.5194/bgd-10-7413-2013,https://doi.org/10.5194/bgd-10-7413-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 16 Apr 2013 Repercussions of differential settling on sediment assemblages and multi-proxy palaeo-reconstructions A. G. M. Caromel, D. N. Schmidt, and J. C. Phillips Biogeosciences Discuss., 10, 6763–6781, https://doi.org/10.5194/bgd-10-6763-2013,https://doi.org/10.5194/bgd-10-6763-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 10 Apr 2013 Responses of lower trophic-level organisms to typhoon passage on the outer shelf of the East China Sea: an incubationexperiment
N. Yasuki, K. Suzuki, and A. Tsuda Biogeosciences Discuss., 10, 6605–6635, https://doi.org/10.5194/bgd-10-6605-2013,https://doi.org/10.5194/bgd-10-6605-2013,2013
Revised manuscript has not been submitted (discussion: closed, 4comments)
03 Apr 2013 Altered phenology and temperature sensitivity of invasive annual grasses and forbs changes autotrophic and heterotrophic respiration rates in a semi-arid shrub community M. Mauritz and D. L. Lipson Biogeosciences Discuss., 10, 6335–6375, https://doi.org/10.5194/bgd-10-6335-2013,https://doi.org/10.5194/bgd-10-6335-2013,2013
Revised manuscript not accepted (discussion: closed, 3 comments) 12 Mar 2013 Decoupling of above and belowground C and N pools within predominant plant species _Stipa grandis_ along a precipitation gradient in Chinese steppe zone X. H. Ye, X. Pan, W. K. Cornwell, J. H. C. Cornelissen, Y. Chu, S. Q. Gao, R. Q. Li, J. J. Qiao, and M. Dong Biogeosciences Discuss., 10, 4995–5013, https://doi.org/10.5194/bgd-10-4995-2013,https://doi.org/10.5194/bgd-10-4995-2013,2013
Revised manuscript not accepted (discussion: closed, 3 comments) 05 Mar 2013 Carbon dioxide fluxes at an intensively cultivated temperate lowland peatland in the East Anglian Fens, UK R. Morrison, A. M. J. Cumming, H. E. Taft, J. Kaduk, S. E. Page, D. L. Jones, R. J. Harding, and H. Balzter Biogeosciences Discuss., 10, 4193–4223, https://doi.org/10.5194/bgd-10-4193-2013,https://doi.org/10.5194/bgd-10-4193-2013,2013
Preprint withdrawn (discussion: closed, 6 comments) 21 Feb 2013 Food quality regulates the metabolism and reproduction of _Temora longicornis_ R. Nobili, C. Robinson, E. Buitenhuis, and C. Castellani Biogeosciences Discuss., 10, 3203–3239, https://doi.org/10.5194/bgd-10-3203-2013,https://doi.org/10.5194/bgd-10-3203-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 05 Feb 2013 The submarine groundwater discharge as a carbon source tothe Baltic Sea
B. Szymczycha, A. Maciejewska, A. Szczepanska, and J. Pempkowiak Biogeosciences Discuss., 10, 2069–2091, https://doi.org/10.5194/bgd-10-2069-2013,https://doi.org/10.5194/bgd-10-2069-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 05 Feb 2013 Differential gene expression in the mussel _Bathymodiolus azoricus_ from the Menez Gwen and Lucky Strike deep-sea hydrothermalvent sites
R. Bettencourt, M. I. Rodrigues, I. Barros, T. Cerqueira, C. Freitas, V. Costa, M. Pinheiro, C. Egas, and R. S. Santos Biogeosciences Discuss., 10, 2013–2038, https://doi.org/10.5194/bgd-10-2013-2013,https://doi.org/10.5194/bgd-10-2013-2013,2013
Revised manuscript not accepted (discussion: closed, 6 comments) 31 Jan 2013 Multiyear precipitation reduction strongly decrease carbon uptake over North China W. P. Yuan, D. Liu, W. J. Dong, S. G. Liu, G. S. Zhou, G. R. Yu, T. B. Zhao, J. M. Feng, Z. G. Ma, J. Q. Chen, Y. Chen, S. P. Chen, S. J. Han, J. P. Huang, L. H. Li, H. Z. Liu, S. M. Liu, M. G. Ma, Y. F. Wang, J. Z. Xia, W. F. Xu, Q. Zhang, X. Q. Zhao, and L. Zhao Biogeosciences Discuss., 10, 1605–1634, https://doi.org/10.5194/bgd-10-1605-2013,https://doi.org/10.5194/bgd-10-1605-2013,2013
Revised manuscript not accepted (discussion: closed, 8 comments) 31 Jan 2013 Impact of physical processes on the phytoplankton blooms in the South China Sea: an eddy-resolving physical-biological modelstudy
Y. Sasai, H. Sasaki, and K. J. Richards Biogeosciences Discuss., 10, 1577–1604, https://doi.org/10.5194/bgd-10-1577-2013,https://doi.org/10.5194/bgd-10-1577-2013,2013
Revised manuscript not accepted (discussion: closed, 5 comments) 30 Jan 2013 Detailed regional predictions of N2O and NO emissions from a tropical highland rainforest N. Gharahi Ghehi, C. Werner, K. Hufkens, R. Kiese, E. Van Ranst, D. Nsabimana, G. Wallin, L. Klemedtsson, K. Butterbach-Bahl, and P.Boeckx
Biogeosciences Discuss., 10, 1483–1516, https://doi.org/10.5194/bgd-10-1483-2013,https://doi.org/10.5194/bgd-10-1483-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 24 Jan 2013 Satellite views of global phytoplankton community distributions using an empirical algorithm and a numerical model C. S. Rousseaux, T. Hirata, and W. W. Gregg Biogeosciences Discuss., 10, 1083–1109, https://doi.org/10.5194/bgd-10-1083-2013,https://doi.org/10.5194/bgd-10-1083-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 24 Jan 2013 Contributions of riverborne inorganic and organic matters to the benthic food web in the East China Sea as inferred from stableisotope ratios
N. N. Chang, J. C. Shiao, G. C. Gong, S. J. Kao, and C. H. Hsieh Biogeosciences Discuss., 10, 1051–1081, https://doi.org/10.5194/bgd-10-1051-2013,https://doi.org/10.5194/bgd-10-1051-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 16 Jan 2013 Biological soil crusts on initial soils: organic carbon dynamics and chemistry under temperate climatic conditions A. Dümig, M. Veste, F. Hagedorn, T. Fischer, P. Lange, R. Spröte, and I. Kögel-Knabner Biogeosciences Discuss., 10, 851–894, https://doi.org/10.5194/bgd-10-851-2013,https://doi.org/10.5194/bgd-10-851-2013,2013
Revised manuscript has not been submitted (discussion: closed, 7comments)
15 Jan 2013 Incorporating genomic information and predicting gene expression patterns in a simplified biogeochemical model P. Wang, A. B. Burd, M. A. Moran, R. R. Hood, V. J. Coles, and P. L.Yager
Biogeosciences Discuss., 10, 815–850, https://doi.org/10.5194/bgd-10-815-2013,https://doi.org/10.5194/bgd-10-815-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 07 Jan 2013 Coupling of the spatial dynamic of picoplankton and nanoflagellate grazing pressure and carbon flow of the microbial food web in the subtropical pelagic continental shelf ecosystem K.-P. Chiang, A.-Y. Tsai, P.-J. Tsai, G.-C. Gong, and S.-F. Tsai Biogeosciences Discuss., 10, 233–263, https://doi.org/10.5194/bgd-10-233-2013,https://doi.org/10.5194/bgd-10-233-2013,2013
Revised manuscript not accepted (discussion: closed, 4 comments) 18 Dec 2012 Abiotic ammonification and gross ammonium photoproduction in the upwelling system off central Chile (36° S) A. Rain-Franco, C. Muñoz, and C. Fernandez Biogeosciences Discuss., 9, 18479–18518, https://doi.org/10.5194/bgd-9-18479-2012,https://doi.org/10.5194/bgd-9-18479-2012,2012
Revised manuscript not accepted (discussion: closed, 3 comments) 17 Dec 2012 Influence of increasing dissolved inorganic carbon concentrations and decreasing pH on chemolithoautrophic bacteria from oxic-sulfidic interfaces K. Mammitzsch, G. Jost, and K. Jürgens Biogeosciences Discuss., 9, 18371–18395, https://doi.org/10.5194/bgd-9-18371-2012,https://doi.org/10.5194/bgd-9-18371-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 04 Dec 2012 Chemosynthesis in the deep-sea: life without the sunC. Smith
Biogeosciences Discuss., 9, 17037–17052, https://doi.org/10.5194/bgd-9-17037-2012,https://doi.org/10.5194/bgd-9-17037-2012,2012
Revised manuscript has not been submitted (discussion: closed, 5comments)
03 Dec 2012 Comprehensive phylogenetic reconstruction of relationships in _Octocorallia (Cnidaria_: _Anthozoa_) from the Atlantic ocean using _mtMutS_ and _nad2_ genes tree reconstructions K. J. Morris, S. Herrera, C. Gubili, P. A. Tyler, A. Rogers, and C.Hauton
Biogeosciences Discuss., 9, 16977–16998, https://doi.org/10.5194/bgd-9-16977-2012,https://doi.org/10.5194/bgd-9-16977-2012,2012
Revised manuscript not accepted (discussion: closed, 3 comments) 22 Nov 2012 _Lingulodinium machaerophorum_ expansion over the last centuries in the Caspian Sea reflects global warming S. A. G. Leroy, H. A. K. Lahijani, J.-L. Reyss, F. Chalié, S. Haghani, M. Shah-Hosseini, S. Shahkarami, A. Tudryn, K. Arpe, P. Habibi, H. S. Nasrollahzadeh, and A. Makhlough Biogeosciences Discuss., 9, 16663–16704, https://doi.org/10.5194/bgd-9-16663-2012,https://doi.org/10.5194/bgd-9-16663-2012,2012
Preprint withdrawn (discussion: closed, 2 comments) 16 Nov 2012 Thermal and haline effects on the calculation of air-sea CO2 fluxes revisited D. K. Woolf, P. E. Land, J. D. Shutler, and L. M. Goddijn-Murphy Biogeosciences Discuss., 9, 16381–16417, https://doi.org/10.5194/bgd-9-16381-2012,https://doi.org/10.5194/bgd-9-16381-2012,2012
Revised manuscript not accepted (discussion: closed, 6 comments) 05 Nov 2012 Marine carbonate system evolution during the EPOCA Arctic pelagic ecosystem experiment in the context of simulated Arctic oceanacidification
R. G. J. Bellerby, A. Silyakova, G. Nondal, D. Slagstad, J. Czerny, T. de Lange, and A. Ludwig Biogeosciences Discuss., 9, 15541–15565, https://doi.org/10.5194/bgd-9-15541-2012,https://doi.org/10.5194/bgd-9-15541-2012,2012
Preprint withdrawn (discussion: closed, 4 comments) 22 Oct 2012 Spatial scale dependency of the modelled climatic response to deforestation P. Longobardi, A. Montenegro, H. Beltrami, and M. Eby Biogeosciences Discuss., 9, 14639–14687, https://doi.org/10.5194/bgd-9-14639-2012,https://doi.org/10.5194/bgd-9-14639-2012,2012
Revised manuscript has not been submitted (discussion: closed, 2comments)
17 Oct 2012 Methane emission measurements in a cattle grazed pasture: a comparison of four methods T. Tallec, K. Klumpp, A. Hensen, Y. Rochette, and J.-F. Soussana Biogeosciences Discuss., 9, 14407–14436, https://doi.org/10.5194/bgd-9-14407-2012,https://doi.org/10.5194/bgd-9-14407-2012,2012
Revised manuscript has not been submitted (discussion: closed, 3comments)
05 Oct 2012 Nitrogen cycling in the Central Arabian Sea: a modelstudy
A. Beckmann and I. Hense Biogeosciences Discuss., 9, 13581–13625, https://doi.org/10.5194/bgd-9-13581-2012,https://doi.org/10.5194/bgd-9-13581-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 18 Sep 2012 Primary production and respiration of hypersaline microbial mats as a response for high and low CO2 availability L. Bento, A. Enrich-Prast, and L. P. Nielsen Biogeosciences Discuss., 9, 12735–12755, https://doi.org/10.5194/bgd-9-12735-2012,https://doi.org/10.5194/bgd-9-12735-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 18 Sep 2012 Microstructure and hydraulic properties of biological soil crusts on sand dunes: a comparison between arid and temperateclimates
T. Fischer, A. Yair, and M. Veste Biogeosciences Discuss., 9, 12711–12734, https://doi.org/10.5194/bgd-9-12711-2012,https://doi.org/10.5194/bgd-9-12711-2012,2012
Revised manuscript not accepted (discussion: closed, 6 comments) 06 Aug 2012 CO2 exchange in a temperate marginal sea of the Mediterranean Sea: processes and carbon budget G. Cossarini, S. Querin, and C. Solidoro Biogeosciences Discuss., 9, 10331–10370, https://doi.org/10.5194/bgd-9-10331-2012,https://doi.org/10.5194/bgd-9-10331-2012,2012
Revised manuscript not accepted (discussion: closed, 6 comments) 31 Jul 2012 Technical Note: _n_-Alkane lipid biomarkers in loess: post-sedimentary or syn-sedimentary? M. Zech, S. Kreutzer, T. Goslar, S. Meszner, T. Krause, D. Faust, andM. Fuchs
Biogeosciences Discuss., 9, 9875–9896, https://doi.org/10.5194/bgd-9-9875-2012,https://doi.org/10.5194/bgd-9-9875-2012,2012
Revised manuscript not accepted (discussion: closed, 6 comments) 31 Jul 2012 Tracing biogeochemical processes and pollution sources with stable isotopes in river systems: Kamniška Bistrica, NorthSlovenia
T. Kanduč, M. Šturm, S. Žigon, and J. McIntosh Biogeosciences Discuss., 9, 9711–9757, https://doi.org/10.5194/bgd-9-9711-2012,https://doi.org/10.5194/bgd-9-9711-2012,2012
Revised manuscript has not been submitted (discussion: closed, 6comments)
27 Jul 2012 Isotope data improve the predictive capabilities of a marine biogeochemical model T. Van Engeland, A. De Kluijver, K. Soetaert, F. J. R. Meysman, and J.J. Middelburg
Biogeosciences Discuss., 9, 9453–9486, https://doi.org/10.5194/bgd-9-9453-2012,https://doi.org/10.5194/bgd-9-9453-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 23 Jul 2012 Two thresholds determine climatic control of forest-firesize in Europe
L. Loepfe, A. Rodrigo, and F. Lloret Biogeosciences Discuss., 9, 9065–9089, https://doi.org/10.5194/bgd-9-9065-2012,https://doi.org/10.5194/bgd-9-9065-2012,2012
Revised manuscript not accepted (discussion: closed, 3 comments) 17 Jul 2012 Mediterranean basin-wide correlations between Saharan dust deposition and ocean chlorophyll concentration R. Gallisai, F. Peters, S. Basart, and J. M. Baldasano Biogeosciences Discuss., 9, 8611–8639, https://doi.org/10.5194/bgd-9-8611-2012,https://doi.org/10.5194/bgd-9-8611-2012,2012
Preprint withdrawn (discussion: closed, 3 comments) 17 Jul 2012 UV-induced carbon monoxide emission from sand and livingvegetation
D. Bruhn, K. R. Albert, T. N. Mikkelsen, and P. Ambus Biogeosciences Discuss., 9, 8449–8473, https://doi.org/10.5194/bgd-9-8449-2012,https://doi.org/10.5194/bgd-9-8449-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 12 Jul 2012 Can whales mix the ocean? T. J. Lavery, B. Roudnew, L. Seuront, J. G. Mitchell, and J. Middleton Biogeosciences Discuss., 9, 8387–8403, https://doi.org/10.5194/bgd-9-8387-2012,https://doi.org/10.5194/bgd-9-8387-2012,2012
Revised manuscript has not been submitted (discussion: closed, 8comments)
10 Jul 2012 Measuring gross and net calcification of a reef coral under ocean acidification conditions: methodological considerations S. Cohen and M. Fine Biogeosciences Discuss., 9, 8241–8272, https://doi.org/10.5194/bgd-9-8241-2012,https://doi.org/10.5194/bgd-9-8241-2012,2012
Revised manuscript has not been submitted (discussion: closed, 4comments)
02 Jul 2012 Feedbacks of CO2 dependent dissolved organic carbon production on atmospheric CO2 in an ocean biogeochemical model L. A. Bordelon-Katrynski and B. Schneider Biogeosciences Discuss., 9, 7983–8011, https://doi.org/10.5194/bgd-9-7983-2012,https://doi.org/10.5194/bgd-9-7983-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 19 Jun 2012 Modeling the seasonal cycle of the oxygen minimum zone over the continental shelf off Concepción, Chile (36.5° S) J. Charpentier, D. Mediavilla, and O. Pizarro Biogeosciences Discuss., 9, 7227–7256, https://doi.org/10.5194/bgd-9-7227-2012,https://doi.org/10.5194/bgd-9-7227-2012,2012
Revised manuscript has not been submitted (discussion: closed, 4comments)
18 Jun 2012 Are small mountainous tropical watersheds of oceanic islands important for carbon export? E. Lloret, C. Dessert, E. Lajeunesse, O. Crispi, L. Pastor, J. Gaillardet, and M. F. Benedetti Biogeosciences Discuss., 9, 7117–7163, https://doi.org/10.5194/bgd-9-7117-2012,https://doi.org/10.5194/bgd-9-7117-2012,2012
Revised manuscript not accepted (discussion: closed, 6 comments) 04 Jun 2012 Sensitivity of North Patagonian temperate rainforests to changes in rainfall regimes: a process-based, dynamic forest model A. G. Gutiérrez, J. J. Armesto, M. F. Díaz, and A. Huth Biogeosciences Discuss., 9, 6293–6333, https://doi.org/10.5194/bgd-9-6293-2012,https://doi.org/10.5194/bgd-9-6293-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 01 Jun 2012 Historical records of eutrophication in Changjiang (Yangtze) River estuary and its adjacent East China Sea F. Cheng, X. Song, Z. Yu, and D. Liu Biogeosciences Discuss., 9, 6261–6291, https://doi.org/10.5194/bgd-9-6261-2012,https://doi.org/10.5194/bgd-9-6261-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 30 May 2012 Effect of carbonate chemistry manipulations on calcification, respiration, and excretion of a Mediterranean pteropod S. Comeau, J.-P. Gattuso, R. Jeffree, and F. Gazeau Biogeosciences Discuss., 9, 6169–6189, https://doi.org/10.5194/bgd-9-6169-2012,https://doi.org/10.5194/bgd-9-6169-2012,2012
Revised manuscript has not been submitted (discussion: closed, 2comments)
25 May 2012 Primary Productivity and heterotrophic activity in an enclosed marine area of central Patagonia (Puyuhuapi channel; 44° S,73° W)
G. Daneri, P. Montero, L. Lizárraga, R. Torres, J. L. Iriarte, B. Jacob, H. E. González, and F. J. Tapia Biogeosciences Discuss., 9, 5929–5968, https://doi.org/10.5194/bgd-9-5929-2012,https://doi.org/10.5194/bgd-9-5929-2012,2012
Revised manuscript has not been submitted (discussion: closed, 4comments)
07 May 2012 Impact of mire reclamation on export potential and characteristics of dissolved carbons in the Sanjiang Plain, NortheastChina
Y. D. Guo, C. C. Song, Y. Z. Lu, Y. Y. Song, and Z. M. Wan Biogeosciences Discuss., 9, 5347–5371, https://doi.org/10.5194/bgd-9-5347-2012,https://doi.org/10.5194/bgd-9-5347-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 25 Apr 2012 Annual hypoxia dynamics in an enclosed gulf K. Kountoura and I. Zacharias Biogeosciences Discuss., 9, 5049–5071, https://doi.org/10.5194/bgd-9-5049-2012,https://doi.org/10.5194/bgd-9-5049-2012,2012
Revised manuscript not accepted (discussion: closed, 8 comments) 20 Apr 2012 Biological productivity in the Mauritanian upwelling estimated with a triple gas approach T. Steinhoff, H. W. Bange, A. Kock, D. W. R. Wallace, and A.Körtzinger
Biogeosciences Discuss., 9, 4853–4875, https://doi.org/10.5194/bgd-9-4853-2012,https://doi.org/10.5194/bgd-9-4853-2012,2012
Revised manuscript has not been submitted (discussion: closed, 9comments)
23 Mar 2012 Effect of Ocean acidification on growth, calcification and recruitment of calcifying and non-calcifying epibionts of brownalgae
V. Saderne and M. Wahl Biogeosciences Discuss., 9, 3739–3766, https://doi.org/10.5194/bgd-9-3739-2012,https://doi.org/10.5194/bgd-9-3739-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 20 Mar 2012 Spatial and temporal variations of dissolved organic carbon and inorganic carbon concentrations and δ13C in a peatland-stream continuum: implications of peatland invasion byvascular plants
S. Gogo, P. Albéric, F. Laggoun-Défarge, S. Binet, and A. Aurouet Biogeosciences Discuss., 9, 3515–3544, https://doi.org/10.5194/bgd-9-3515-2012,https://doi.org/10.5194/bgd-9-3515-2012,2012
Revised manuscript has not been submitted (discussion: closed, 4comments)
14 Mar 2012 Improved determination of daytime net ecosystem exchange of carbon dioxide at croplands P. Zhao and J. Lüers Biogeosciences Discuss., 9, 2883–2919, https://doi.org/10.5194/bgd-9-2883-2012,https://doi.org/10.5194/bgd-9-2883-2012,2012
Revised manuscript not accepted (discussion: closed, 3 comments) 12 Mar 2012 Distributions of the carbonate system properties, anthropogenic CO2, and acidification during the 2008 BOUM cruise(Mediterranean Sea)
F. Touratier, V. Guglielmi, C. Goyet, L. Prieur, M. Pujo-Pay, P.Conan, and C. Falco
Biogeosciences Discuss., 9, 2709–2753, https://doi.org/10.5194/bgd-9-2709-2012,https://doi.org/10.5194/bgd-9-2709-2012,2012
Revised manuscript not accepted (discussion: closed, 9 comments) 03 Feb 2012 Dissolved organic carbon release by marine macrophytes C. Barrón, E. T. Apostolaki, and C. M. Duarte Biogeosciences Discuss., 9, 1529–1555, https://doi.org/10.5194/bgd-9-1529-2012,https://doi.org/10.5194/bgd-9-1529-2012,2012
Revised manuscript has not been submitted (discussion: closed, 6comments)
03 Feb 2012 Progress on quantitative assessment methods of biological aerosols in the atmosphere L. Liang, K. He, and F. Duan Biogeosciences Discuss., 9, 1511–1528, https://doi.org/10.5194/bgd-9-1511-2012,https://doi.org/10.5194/bgd-9-1511-2012,2012
Preprint withdrawn (discussion: closed, 2 comments) 26 Jan 2012 Environmental factors regulating winter CO2 flux in snow-covered boreal forest soil, interior Alaska Y. Kim and Y. Kodama Biogeosciences Discuss., 9, 1129–1159, https://doi.org/10.5194/bgd-9-1129-2012,https://doi.org/10.5194/bgd-9-1129-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 16 Jan 2012 Pyrite Oxidation under initially neutral pH conditions and in the presence of _Acidithiobacillus ferrooxidans_ and micromolarhydrogen peroxide
Y. Ma and C. Lin
Biogeosciences Discuss., 9, 557–579, https://doi.org/10.5194/bgd-9-557-2012,https://doi.org/10.5194/bgd-9-557-2012,2012
Revised manuscript not accepted (discussion: closed, 10 comments) 16 Jan 2012 Seasonal and latitudinal patterns of pelagic community metabolism in surface waters of the Atlantic OceanS. Agusti
Biogeosciences Discuss., 9, 507–525, https://doi.org/10.5194/bgd-9-507-2012,https://doi.org/10.5194/bgd-9-507-2012,2012
Revised manuscript not accepted (discussion: closed, 4 comments) 04 Jan 2012 Nitrous oxide emission reduction in temperate biochar-amended soils R. Felber, R. Hüppi, J. Leifeld, and A. Neftel Biogeosciences Discuss., 9, 151–189, https://doi.org/10.5194/bgd-9-151-2012,https://doi.org/10.5194/bgd-9-151-2012,2012
Preprint withdrawn (discussion: closed, 4 comments) 14 Dec 2011 Spatio-temporal variability of the CO2 system on theScotian Shelf
E. H. Shadwick, H. Thomas, A. E. F. Prowe, and E. Horne Biogeosciences Discuss., 8, 12013–12050, https://doi.org/10.5194/bgd-8-12013-2011,https://doi.org/10.5194/bgd-8-12013-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 14 Dec 2011 Changes in carbon fluxes and pools induced by cropland expansion in South and Southeast Asia in the 20th century B. Tao, H. Tian, G. Chen, W. Ren, C. Lu, K. D. Alley, X. Xu, M. Liu, S. Pan, and H. Virji Biogeosciences Discuss., 8, 11979–12012, https://doi.org/10.5194/bgd-8-11979-2011,https://doi.org/10.5194/bgd-8-11979-2011,2011
Revised manuscript not accepted (discussion: closed, 8 comments) 18 Nov 2011 Soil carbon dynamics during secondary succession in a semi-arid Mediterranean environment A. Novara, L. Gristina, T. La Mantia, and J. Rühl Biogeosciences Discuss., 8, 11107–11138, https://doi.org/10.5194/bgd-8-11107-2011,https://doi.org/10.5194/bgd-8-11107-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 08 Nov 2011 Landscape patterns of soil oxygen and atmospheric greenhouse gases in a northern hardwood forest landscape S. F. Werner, C. T. Driscoll, P. M. Groffman, and J. B. Yavitt Biogeosciences Discuss., 8, 10859–10893, https://doi.org/10.5194/bgd-8-10859-2011,https://doi.org/10.5194/bgd-8-10859-2011,2011
Revised manuscript has not been submitted (discussion: closed, 3comments)
08 Nov 2011 A model study on the sensitivity of surface ocean CO2 pressure with respect to the CO2 gas exchange rate P. Landschützer, J. F. Tjiputra, K. Assmann, and C. Heinze Biogeosciences Discuss., 8, 10797–10821, https://doi.org/10.5194/bgd-8-10797-2011,https://doi.org/10.5194/bgd-8-10797-2011,2011
Revised manuscript has not been submitted (discussion: closed, 6comments)
28 Oct 2011 Daily CO2 partial pressure and CO2 outgassing in the upper Yangtze River basin: a case study of Longchuanjiang, China S. Y. Li, X. X. Lu, M. He, Y. Zhou, L. Li, and A. D. Ziegler Biogeosciences Discuss., 8, 10645–10676, https://doi.org/10.5194/bgd-8-10645-2011,https://doi.org/10.5194/bgd-8-10645-2011,2011
Revised manuscript has not been submitted (discussion: closed, 2comments)
29 Sep 2011 New products for a better characterisation of smoke plume and gas/aerosol dispersion from boreal eurasian forest fires: the ALANIS Smoke Plume project J.-P. Muller, V. Yershov, D. Fisher, M. Krol, W. Peters, J. San-Miguel, I. Palumbo, F. Sedano, P. Strobl, C. Clerbaux, M. George, J. Helbert, and B. Guillaume Biogeosciences Discuss., 8, 9747–9761, https://doi.org/10.5194/bgd-8-9747-2011,https://doi.org/10.5194/bgd-8-9747-2011,2011
Revised manuscript has not been submitted (discussion: closed, 2comments)
20 Sep 2011 Transformation of dissolved inorganic carbon (DIC) into particulate organic carbon (POC) in the lower Xijiang River, SE China: an isotopic approach H. G. Sun, J. T. Han, S. R. Zhang, and X. X. Lu Biogeosciences Discuss., 8, 9471–9501, https://doi.org/10.5194/bgd-8-9471-2011,https://doi.org/10.5194/bgd-8-9471-2011,2011
Revised manuscript not accepted (discussion: closed, 5 comments) 12 Sep 2011 An approach to the investigation of CO2 uptake by soilmicroorganisms
K. M. Hart, B. W. Moran, C. C. R. Allen, V. Kouloumbos, S. F. Oppenheimer, L. Barron, A. J. Simpson, L. A. Kulakov, and B. P.Kelleher
Biogeosciences Discuss., 8, 9235–9281, https://doi.org/10.5194/bgd-8-9235-2011,https://doi.org/10.5194/bgd-8-9235-2011,2011
Preprint withdrawn (discussion: closed, 4 comments) 09 Sep 2011 Non-lethal effects of ocean acidification on two symbiont-bearing benthic foraminiferal species A. McIntyre-Wressnig, J. M. Bernhard, D. C. McCorkle, and P. Hallock Biogeosciences Discuss., 8, 9165–9200, https://doi.org/10.5194/bgd-8-9165-2011,https://doi.org/10.5194/bgd-8-9165-2011,2011
Revised manuscript has not been submitted (discussion: closed, 4comments)
26 Aug 2011 Seasonality of ecosystem respiration in a double-cropping paddy field in Bangladesh M. S. Hossen, M. Mano, A. Miyata, M. A. Baten, and T. Hiyama Biogeosciences Discuss., 8, 8693–8721, https://doi.org/10.5194/bgd-8-8693-2011,https://doi.org/10.5194/bgd-8-8693-2011,2011
Revised manuscript has not been submitted (discussion: closed, 2comments)
23 Aug 2011 On the use of satellites to obtain information on the occurrence of natural and anthropogenic aerosols over the borealeurasian forest
G. de Leeuw, A. Arola, L. Sogacheva, N. Kivekäs, V.-M. Kerminen, A. Arneth, T. Christensen, H. Korhonen, A.-I. Partanen, H. Lappalainen, P. Kolmonen, T. Mielonen, M. Sofiev, M. Kulmala, and S. Pinnock Biogeosciences Discuss., 8, 8451–8483, https://doi.org/10.5194/bgd-8-8451-2011,https://doi.org/10.5194/bgd-8-8451-2011,2011
Revised manuscript has not been submitted (discussion: closed, 4comments)
23 Aug 2011 Effect of salinity induced pH changes on benthic foraminifera: a laboratory culture experiment R. Saraswat, M. Kouthanker, S. Kurtarkar, R. Nigam, and V. N. Linshy Biogeosciences Discuss., 8, 8423–8450, https://doi.org/10.5194/bgd-8-8423-2011,https://doi.org/10.5194/bgd-8-8423-2011,2011
Revised manuscript not accepted (discussion: closed, 6 comments) 11 Aug 2011 Controls on benthic biomass size spectra in shelf and deep-sea sediments – a modelling study B. A. Kelly-Gerreyn, T. R. Anderson, B. J. Bett, A. P. Martin, and J.I. Kaariainen
Biogeosciences Discuss., 8, 8189–8240, https://doi.org/10.5194/bgd-8-8189-2011,https://doi.org/10.5194/bgd-8-8189-2011,2011
Revised manuscript has not been submitted (discussion: closed, 2comments)
22 Jul 2011 Mineral dust aerosol from Saharan desert by means of atmospheric, emission, dispersion modelling F. Guarnieri, F. Calastrini, C. Busillo, M. Pasqui, S. Becagli, F. Lucarelli, G. Calzolai, S. Nava, and R. Udisti Biogeosciences Discuss., 8, 7313–7338, https://doi.org/10.5194/bgd-8-7313-2011,https://doi.org/10.5194/bgd-8-7313-2011,2011
Revised manuscript has not been submitted (discussion: closed, 3comments)
21 Jul 2011 Modeling the vertical soil organic matter profile using 210Pbex measurements and Bayesian inversion M. C. Braakhekke, T. Wutzler, M. Reichstein, J. Kattge, C. Beer, M. Schrumpf, I. Schöning, M. R. Hoosbeek, B. Kruijt, and P. Kabat Biogeosciences Discuss., 8, 7257–7312, https://doi.org/10.5194/bgd-8-7257-2011,https://doi.org/10.5194/bgd-8-7257-2011,2011
Revised manuscript has not been submitted (discussion: closed, 2comments)
19 Jul 2011 Above- and below-ground response to soil moisture change on an alpine wetland ecosystem in the Qinghai-Tibetan Plateau, China G.-L. Wu, W. Li, L.-P. Zhao, Z.-H. Shi, and Z.-P. Shangguan Biogeosciences Discuss., 8, 7141–7164, https://doi.org/10.5194/bgd-8-7141-2011,https://doi.org/10.5194/bgd-8-7141-2011,2011
Preprint withdrawn (discussion: closed, 7 comments) 13 Jul 2011 Phytoplankton distribution in the Western Arctic Ocean during a summer of exceptional ice retreat P. Coupel, H. Y. Jin, D. Ruiz-Pino, J. F. Chen, S. H. Lee, H. L. Li, M. Rafizadeh, V. Garçon, and J. C. Gascard Biogeosciences Discuss., 8, 6919–6970, https://doi.org/10.5194/bgd-8-6919-2011,https://doi.org/10.5194/bgd-8-6919-2011,2011
Revised manuscript not accepted (discussion: closed, 9 comments) 08 Jul 2011 Volatile diterpene emission from dominant conifers inJapan
S. N. Matsunaga, S. Chatani, S. Nakatsuka, D. Kusumoto, K. Kubota, Y. Utsumi, T. Enoki, A. Tani, and T. Hiura Biogeosciences Discuss., 8, 6681–6700, https://doi.org/10.5194/bgd-8-6681-2011,https://doi.org/10.5194/bgd-8-6681-2011,2011
Revised manuscript not accepted (discussion: closed, 5 comments) 08 Jul 2011 A Holocene record of mercury accumulation in a pristine lake in Southernmost South America (53° S) – climatic and environmental drivers Y.-M. Hermanns and H. Biester Biogeosciences Discuss., 8, 6555–6588, https://doi.org/10.5194/bgd-8-6555-2011,https://doi.org/10.5194/bgd-8-6555-2011,2011
Revised manuscript not accepted (discussion: closed, 6 comments) 08 Jul 2011 Can Mg isotopes be used to trace cyanobacteria-mediated magnesium carbonate precipitation in alkaline lakes? L. S. Shirokova, V. Mavromatis, I. Bundeleva, O. S. Pokrovsky, P. Bénézeth, C. Pearce, E. Gérard, S. Balor, and E. H. Oelkers Biogeosciences Discuss., 8, 6473–6517, https://doi.org/10.5194/bgd-8-6473-2011,https://doi.org/10.5194/bgd-8-6473-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 07 Jul 2011 Soil warming in a cool-temperate mixed forest with peat soil enhanced heterotrophic and basal respiration rates but _Q_10remained unchanged
M. Aguilos, K. Takagi, N. Liang, Y. Watanabe, S. Goto, Y. Takahashi, H. Mukai, and K. Sasa Biogeosciences Discuss., 8, 6415–6445, https://doi.org/10.5194/bgd-8-6415-2011,https://doi.org/10.5194/bgd-8-6415-2011,2011
Revised manuscript not accepted (discussion: closed, 6 comments) 30 Jun 2011 The combined impact of CO2-dependent parameterisations of Redfield and Rain ratios on ocean carbonate saturation K. F. Kvale, K. J. Meissner, M. d'Orgeville, R. J. Matear, B. I. McNeil, and M. H. England Biogeosciences Discuss., 8, 6265–6280, https://doi.org/10.5194/bgd-8-6265-2011,https://doi.org/10.5194/bgd-8-6265-2011,2011
Revised manuscript not accepted (discussion: closed, 7 comments) 29 Jun 2011 Ecological research and large scale land-atmosphere feedbacks: lesson from the Bouchet's complementary relationship E. Lugato, G. Alberti, B. Gioli, J. O. Kaplan, A. Peressotti, and F.Miglietta
Biogeosciences Discuss., 8, 6077–6094, https://doi.org/10.5194/bgd-8-6077-2011,https://doi.org/10.5194/bgd-8-6077-2011,2011
Revised manuscript has not been submitted (discussion: closed, 4comments)
29 Jun 2011 Effects of flooding cycles in the Pantanal on the turnover of soil nitrogen pools and emission of N2O L. Liengaard, L. P. Nielsen, N. P. Revsbech, B. Elberling, A. Priemé, A. E. Prast, and M. Kühl Biogeosciences Discuss., 8, 5991–6030, https://doi.org/10.5194/bgd-8-5991-2011,https://doi.org/10.5194/bgd-8-5991-2011,2011
Revised manuscript not accepted (discussion: closed, 6 comments) 09 Jun 2011 Contributions of agricultural plants and soils to N2O emission in a farmland J. Li, X. Lee, Q. Yu, X. Tong, Z. Qin, and B. Macdonald Biogeosciences Discuss., 8, 5505–5535, https://doi.org/10.5194/bgd-8-5505-2011,https://doi.org/10.5194/bgd-8-5505-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 27 May 2011 Coexisting methane and oxygen excesses in nitrate-limited polar water (Fram Strait) during ongoing sea ice melting E. Damm, S. Thoms, G. Kattner, A. Beszczynska-Möller, E. M. Nöthig,and I. Stimac
Biogeosciences Discuss., 8, 5179–5195, https://doi.org/10.5194/bgd-8-5179-2011,https://doi.org/10.5194/bgd-8-5179-2011,2011
Revised manuscript not accepted (discussion: closed, 3 comments) 06 May 2011 Response of δ13C in plant and soil respiration to awater pulse
Y. Salmon, N. Buchmann, and R. L. Barnard Biogeosciences Discuss., 8, 4493–4527, https://doi.org/10.5194/bgd-8-4493-2011,https://doi.org/10.5194/bgd-8-4493-2011,2011
Preprint withdrawn (discussion: closed, 4 comments) 06 May 2011 Paleofires and the dynamics of carbon cycling in Chinese Loess Plateau over the last two glacial cycles X. Wang and Z. L. Ding Biogeosciences Discuss., 8, 4459–4492, https://doi.org/10.5194/bgd-8-4459-2011,https://doi.org/10.5194/bgd-8-4459-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 20 Apr 2011 Recovery of GPP monthly pattern in a eucalypt site in Portugal after felling A. Rodrigues and G. Pita Biogeosciences Discuss., 8, 3999–4014, https://doi.org/10.5194/bgd-8-3999-2011,https://doi.org/10.5194/bgd-8-3999-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 12 Apr 2011 Environmental factors associated with long-term changes in chlorophyll-_A_ concentration in the Amazon floodplain E. Alcântara, E. M. Novo, C. F. Barbosa, M.-P. Bonnet, J. Stech, andJ. P. Ometto
Biogeosciences Discuss., 8, 3739–3770, https://doi.org/10.5194/bgd-8-3739-2011,https://doi.org/10.5194/bgd-8-3739-2011,2011
Manuscript not accepted for further review (discussion: closed, 1comment)
02 Mar 2011 Impact of extreme precipitation and water table change on N2O fluxes in a bio-energy poplar plantation D. Zona, I. A. Janssens, M. S. Verlinden, L. S. Broeckx, J. Cools, B. Gioli, A. Zaldei, and R. Ceulemans Biogeosciences Discuss., 8, 2057–2092, https://doi.org/10.5194/bgd-8-2057-2011,https://doi.org/10.5194/bgd-8-2057-2011,2011
Revised manuscript not accepted (discussion: closed, 7 comments) 02 Mar 2011 Evidence for microbial dissolution of pyrite from the Lower Cambrian oolitic limestone, South China W. Liu and X.-L. Zhang Biogeosciences Discuss., 8, 2035–2056, https://doi.org/10.5194/bgd-8-2035-2011,https://doi.org/10.5194/bgd-8-2035-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 01 Mar 2011 Role of net radiation on energy balance closure in heterogeneous grasslands C. Shao, J. Chen, L. Li, G. Tenney, W. Xu, and J. Xu Biogeosciences Discuss., 8, 2001–2033, https://doi.org/10.5194/bgd-8-2001-2011,https://doi.org/10.5194/bgd-8-2001-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 23 Feb 2011 Effects of cloudiness on carbon dioxide exchange over an irrigated maize cropland in northwestern China B. C. Zhang, J. J. Cao, Y. F. Bai, S. J. Yang, L. Hu, and Z. G. Ning Biogeosciences Discuss., 8, 1669–1691, https://doi.org/10.5194/bgd-8-1669-2011,https://doi.org/10.5194/bgd-8-1669-2011,2011
Revised manuscript not accepted (discussion: closed, 6 comments) 21 Feb 2011 Soil organic carbon (SOC) accumulation in rice paddies under long-term agro-ecosystem experiments in southern China – VI. Changes in microbial community structure and respiratory activity D. Liu, X. Liu, Y. Liu, L. Li, G. Pan, D. Crowley, and R. Tippkötter Biogeosciences Discuss., 8, 1529–1554, https://doi.org/10.5194/bgd-8-1529-2011,https://doi.org/10.5194/bgd-8-1529-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 14 Feb 2011 Examining moisture and temperature sensitivity of soil organic matter decomposition in a temperate coniferous forest soil C. E. Gabriel and L. Kellman Biogeosciences Discuss., 8, 1369–1409, https://doi.org/10.5194/bgd-8-1369-2011,https://doi.org/10.5194/bgd-8-1369-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 10 Feb 2011 Biogeochemistry of sediments from restricted exchange environments of Kandalaksha Bay, White Sea, Russian Arctic S. Koukina, A. Vetrov, and N. Belyaev Biogeosciences Discuss., 8, 1309–1333, https://doi.org/10.5194/bgd-8-1309-2011,https://doi.org/10.5194/bgd-8-1309-2011,2011
Preprint withdrawn (discussion: closed, 5 comments) 31 Jan 2011 Stable carbon isotope as a proxy for the change of phytoplankton community structure in cascade reservoirs from WujiangRiver, China
B. Wang, C. Q. Liu, X. Peng, F. Wang, and C. Chen Biogeosciences Discuss., 8, 831–856, https://doi.org/10.5194/bgd-8-831-2011,https://doi.org/10.5194/bgd-8-831-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 18 Jan 2011 Phytoplankton diversity and productivity in a highly turbid, tropical coastal system (Bach Dang Estuary, Vietnam) E. J. Rochelle-Newall, V. T. Chu, O. Pringault, D. Amouroux, R. Arfi, Y. Bettarel, T. Bouvier, C. Bouvier, P. Got, T. M. H. Nguyen, X. Mari, P. Navarro, T. N. Duong, T. T. T. Cao, T. T. Pham, S. Ouillon, andJ.-P. Torréton
Biogeosciences Discuss., 8, 487–525, https://doi.org/10.5194/bgd-8-487-2011,https://doi.org/10.5194/bgd-8-487-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 11 Jan 2011 Manganese redox cycling in Lake Imandra: impact on nitrogen and the trace metal sediment record J. Ingri, L. Pekka, V. Dauvalter, I. Rodushkin, and E. Peinerud Biogeosciences Discuss., 8, 273–321, https://doi.org/10.5194/bgd-8-273-2011,https://doi.org/10.5194/bgd-8-273-2011,2011
Revised manuscript has not been submitted (discussion: closed, 3comments)
04 Jan 2011 Carbon isotope discrimination during litter decomposition can be explained by selective use of substrate with differing _δ_13C J. Ngao and M. F. Cotrufo Biogeosciences Discuss., 8, 51–82, https://doi.org/10.5194/bgd-8-51-2011,https://doi.org/10.5194/bgd-8-51-2011,2011
Revised manuscript not accepted (discussion: closed, 4 comments) 15 Dec 2010 Spatial and seasonal variability of heterotrophic and autotrophic soil respiration in a winter wheat stand N. Prolingheuer, B. Scharnagl, A. Graf, H. Vereecken, and M. Herbst Biogeosciences Discuss., 7, 9137–9173, https://doi.org/10.5194/bgd-7-9137-2010,https://doi.org/10.5194/bgd-7-9137-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 13 Dec 2010 The influence of pulsed redox conditions on soilphosphorus
R. Scalenghe, A. C. Edwards, E. Barberis, and F. Ajmone Marsan Biogeosciences Discuss., 7, 9009–9037, https://doi.org/10.5194/bgd-7-9009-2010,https://doi.org/10.5194/bgd-7-9009-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 27 Oct 2010 Production and consumption mechanisms of N2O in the Southern Ocean revealed from its isotopomer ratios N. Boontanon, S. Watanabe, T. Odate, and N. Yoshida Biogeosciences Discuss., 7, 7821–7848, https://doi.org/10.5194/bgd-7-7821-2010,https://doi.org/10.5194/bgd-7-7821-2010,2010
Revised manuscript has not been submitted (discussion: closed, 4comments)
20 Oct 2010 Anthropogenic stressors and eutrophication processes as recorded by stable isotopes compositions in coral skeletons O. Levy, M. Rosenfeld, Y. Loya, R. Yam, I. Mizrachi, and A. Shemesh Biogeosciences Discuss., 7, 7657–7672, https://doi.org/10.5194/bgd-7-7657-2010,https://doi.org/10.5194/bgd-7-7657-2010,2010
Revised manuscript has not been submitted (discussion: closed, 3comments)
29 Sep 2010 Methane production, consumption and its carbon isotope ratios in the Southern Ocean during the austral summer N. Boontanon, S. Watanabe, T. Odate, and N. Yoshida Biogeosciences Discuss., 7, 7207–7225, https://doi.org/10.5194/bgd-7-7207-2010,https://doi.org/10.5194/bgd-7-7207-2010,2010
Revised manuscript has not been submitted (discussion: closed, 4comments)
24 Sep 2010 The influence of leaf photosynthetic efficiency and stomatal closure on canopy carbon uptake and evapotranspiration – a model study in wheat and sugar beet A. Schickling, A. Graf, R. Pieruschka, C. Plückers, H. Geiß, I.-L. Lai, J. H. Schween, K. Erentok, M. Schmidt, A. Wahner, S. Crewell, andU. Rascher
Biogeosciences Discuss., 7, 7131–7172, https://doi.org/10.5194/bgd-7-7131-2010,https://doi.org/10.5194/bgd-7-7131-2010,2010
Revised manuscript has not been submitted (discussion: closed, 7comments)
09 Sep 2010 Temporal and spatial variations of soil carbon dioxide, methane, and nitrous oxide fluxes in a Southeast Asian tropicalrainforest
M. Itoh, Y. Kosugi, S. Takanashi, Y. Hayashi, S. Kanemitsu, K. Osaka, M. Tani, and A. R. Nik Biogeosciences Discuss., 7, 6847–6887, https://doi.org/10.5194/bgd-7-6847-2010,https://doi.org/10.5194/bgd-7-6847-2010,2010
Revised manuscript not accepted (discussion: closed, 6 comments) 03 Sep 2010 Transport and characterization of ambient biological aerosol near Laurel, MD J. L. Santarpia, D. Cunningham, J. Gilberry, S. Kim, E. E. Smith, S. Ratnesar-Shumate, and J. Quizon Biogeosciences Discuss., 7, 6725–6747, https://doi.org/10.5194/bgd-7-6725-2010,https://doi.org/10.5194/bgd-7-6725-2010,2010
Revised manuscript not accepted (discussion: closed, 3 comments) 02 Sep 2010 High production of nitrous oxide (N2O), methane (CH4) and dimethylsulphoniopropionate (DMSP) in a massive marine phytoplanktonculture
L. Florez-Leiva, E. Tarifeño, M. Cornejo, R. Kiene, and L. Farías Biogeosciences Discuss., 7, 6705–6723, https://doi.org/10.5194/bgd-7-6705-2010,https://doi.org/10.5194/bgd-7-6705-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 19 Aug 2010 Assessing the ecological status of plankton in Anjos Bay: a flow cytometry approach G. C. Pereira, A. R. de Figuiredo, P. M. Jabor, and N. F. F. Ebecken Biogeosciences Discuss., 7, 6243–6264, https://doi.org/10.5194/bgd-7-6243-2010,https://doi.org/10.5194/bgd-7-6243-2010,2010
Revised manuscript not accepted (discussion: closed, 9 comments) 13 Aug 2010 Impact of seasonal oxygen deficiency on the phosphorous geochemistry of surface sediments along the Western Continental Shelfof India
Josia Jacob, Prosenjit Ghosh, K. K. Balchandran, and Rejomon George Biogeosciences Discuss., 7, 6089–6119, https://doi.org/10.5194/bgd-7-6089-2010,https://doi.org/10.5194/bgd-7-6089-2010,2010
Preprint withdrawn (discussion: closed, 8 comments) 13 Aug 2010 Seasonal variations in nitrate isotope composition of three rivers draining into the North Sea A. Deek, K. Emeis, and U. Struck Biogeosciences Discuss., 7, 6051–6088, https://doi.org/10.5194/bgd-7-6051-2010,https://doi.org/10.5194/bgd-7-6051-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 13 Aug 2010 The greenhouse gas balance of European grasslands P. Ciais, J. F. Soussana, N. Vuichard, S. Luyssaert, A. Don, I. A. Janssens, S. L. Piao, R. Dechow, J. Lathière, F. Maignan, M. Wattenbach, P. Smith, C. Ammann, A. Freibauer, E. D. Schulze, and the CARBOEUROPE Synthesis Team Biogeosciences Discuss., 7, 5997–6050, https://doi.org/10.5194/bgd-7-5997-2010,https://doi.org/10.5194/bgd-7-5997-2010,2010
Revised manuscript has not been submitted (discussion: closed, 2comments)
13 Aug 2010 Impact of nutrient starvation on the biochemical composition of the marine diatom _Thalassiosira weissflogii_: from the whole cell to the frustule fraction C. Soler, P. Claquin, M. Goutx, O. Ragueneau, and B. Moriceau Biogeosciences Discuss., 7, 5953–5995, https://doi.org/10.5194/bgd-7-5953-2010,https://doi.org/10.5194/bgd-7-5953-2010,2010
Revised manuscript has not been submitted (discussion: closed, 3comments)
03 Aug 2010 Impacts of increasing water and nitrogen availability on ecosystem CO2 fluxes in a temperate steppe of Northern China L. Yan, S. Chen, J. Huang, and G. Lin Biogeosciences Discuss., 7, 5829–5858, https://doi.org/10.5194/bgd-7-5829-2010,https://doi.org/10.5194/bgd-7-5829-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 19 Jul 2010 Impact of climate and land use/cover changes on the carbon cycle in China (1981–2000): a system-based assessment Z. Gao, W. Gao, and N.-B. Chang Biogeosciences Discuss., 7, 5517–5555, https://doi.org/10.5194/bgd-7-5517-2010,https://doi.org/10.5194/bgd-7-5517-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 08 Jun 2010 Crustal uplifting rate associated with late-Holocene glacial-isostatic rebound at Skallen and Skarvsnes, Lützow-Holm Bay, East Antarctica: evidence of a synchrony in sedimentary and biological facies on geological setting Y. Takano, Y. Yokoyama, J. J. Tyler, H. Kojima, M. Fukui, T. Sato, N. O. Ogawa, N. Suzuki, H. Kitazato, and N. Ohkouchi Biogeosciences Discuss., 7, 4341–4384, https://doi.org/10.5194/bgd-7-4341-2010,https://doi.org/10.5194/bgd-7-4341-2010,2010
Revised manuscript not accepted (discussion: closed, 5 comments) 31 May 2010 Organic nutrients as sources of N and P to the upper layers of the North Atlantic subtropical gyre along 24.5° N A. Landolfi, H. Dietze, W. Koeve, R. Mather, and R. Sanders Biogeosciences Discuss., 7, 4001–4044, https://doi.org/10.5194/bgd-7-4001-2010,https://doi.org/10.5194/bgd-7-4001-2010,2010
Manuscript not accepted for further review (discussion: closed, 4comments)
25 May 2010 Spatial and temporal variations in the sea surface _p_CO2 and air-sea CO2 flux in the equatorial Pacific: model sensitivity to gas exchange and biological formulationsX. J. Wang
Biogeosciences Discuss., 7, 3879–3910, https://doi.org/10.5194/bgd-7-3879-2010,https://doi.org/10.5194/bgd-7-3879-2010,2010
Revised manuscript not accepted (discussion: closed, 3 comments) 21 May 2010 Comprehensive description of the carbon cycle of an ancient temperate broadleaved woodland K. Fenn, Y. Malhi, M. Morecroft, C. Lloyd, and M. Thomas Biogeosciences Discuss., 7, 3735–3763, https://doi.org/10.5194/bgd-7-3735-2010,https://doi.org/10.5194/bgd-7-3735-2010,2010
Revised manuscript not accepted (discussion: closed, 5 comments) 19 May 2010 Altered response to nitrogen supply of mixed grassland communities in a future climate: a controlled environment microcosmstudy
J. Van den Berge, K. Naudts, C. Zavalloni, I. A. Janssens, R. Ceulemans, and I. Nijs Biogeosciences Discuss., 7, 3579–3604, https://doi.org/10.5194/bgd-7-3579-2010,https://doi.org/10.5194/bgd-7-3579-2010,2010
Preprint withdrawn (discussion: closed, 2 comments) 04 May 2010 Quantification of DOC concentrations in relation with soil properties of soils in tundra and taiga of Northern EuropeanRussia
M. R. Oosterwoud, E. J. M. Temminghoff, and S. E. A. T. M. van der Zee Biogeosciences Discuss., 7, 3189–3226, https://doi.org/10.5194/bgd-7-3189-2010,https://doi.org/10.5194/bgd-7-3189-2010,2010
Revised manuscript not accepted (discussion: closed, 3 comments) 08 Apr 2010 Factors controlling the temporal variability of mass and trace metal downward flux at 1000 m depth at the DYFAMED site (Northwestern Mediterranean Sea) L.-E. Heimbürger, C. Migon, R. Losno, J.-C. Miquel, N. Leblond, andD. Cossa
Biogeosciences Discuss., 7, 2549–2567, https://doi.org/10.5194/bgd-7-2549-2010,https://doi.org/10.5194/bgd-7-2549-2010,2010
Revised manuscript not accepted (discussion: closed, 6 comments) 29 Mar 2010 No change in topsoil carbon levels of Great Britain,1978–2007
P. M. Chamberlain, B. A. Emmett, W. A. Scott, H. I. J. Black, M. Hornung, and Z. L. Frogbrook Biogeosciences Discuss., 7, 2267–2311, https://doi.org/10.5194/bgd-7-2267-2010,https://doi.org/10.5194/bgd-7-2267-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 26 Mar 2010 Climate driven decadal variations of biological production and plankton biomass in the equatorial Pacific Ocean: is this a regime shift? X. J. Wang, R. Murtugudde, and R. Le Borgne Biogeosciences Discuss., 7, 2169–2193, https://doi.org/10.5194/bgd-7-2169-2010,https://doi.org/10.5194/bgd-7-2169-2010,2010
Revised manuscript not accepted (discussion: closed, 5 comments) 15 Mar 2010 Formation of anoxia and denitrification in the bottom waters of a tropical estuary, southwest coast of India G. D. Martin, K. R. Muraleedharan, J. G. Vijay, G. Rejomon, N. V. Madhu, A. Shivaprasad, C. K. Haridevi, M. Nair, K. K. Balachandran, C. Revichandran, K. V. Jayalakshmy, and N. Chandramohanakumar Biogeosciences Discuss., 7, 1751–1782, https://doi.org/10.5194/bgd-7-1751-2010,https://doi.org/10.5194/bgd-7-1751-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 08 Mar 2010 On CO2 pertubation experiments: over-determination of carbonate chemistry reveals inconsistencies C. J. M. Hoppe, G. Langer, S. D. Rokitta, D. A. Wolf-Gladrow, and B.Rost
Biogeosciences Discuss., 7, 1707–1726, https://doi.org/10.5194/bgd-7-1707-2010,https://doi.org/10.5194/bgd-7-1707-2010,2010
Revised manuscript not accepted (discussion: closed, 7 comments) 03 Mar 2010 Technical Note: A combined soil/canopy chamber system for tracing δ13C in soil respiration after a 13CO2 canopy pulse labelling M. Barthel, P. Sturm, L. Gentsch, and A. Knohl Biogeosciences Discuss., 7, 1603–1631, https://doi.org/10.5194/bgd-7-1603-2010,https://doi.org/10.5194/bgd-7-1603-2010,2010
Revised manuscript not accepted (discussion: closed, 3 comments) 03 Mar 2010 Carbon input control over soil organic matter dynamics in a temperate grassland exposed to elevated CO2 and warming Y. Carrillo, E. Pendall, F. A. Dijkstra, J. A. Morgan, and J. M.Newcomb
Biogeosciences Discuss., 7, 1575–1602, https://doi.org/10.5194/bgd-7-1575-2010,https://doi.org/10.5194/bgd-7-1575-2010,2010
Revised manuscript not accepted (discussion: closed, 9 comments) 17 Feb 2010 Estimation of nighttime ecosystem respiration over a paddy field in China M. S. Hossen, T. Hiyama, and H. Tanaka Biogeosciences Discuss., 7, 1201–1232, https://doi.org/10.5194/bgd-7-1201-2010,https://doi.org/10.5194/bgd-7-1201-2010,2010
Revised manuscript has not been submitted (discussion: closed, 4comments)
16 Feb 2010 Satellites reveal an increase in gross primary production in a greenlandic high arctic fen 1992–2008 T. Tagesson, M. Mastepanov, M. P. Tamstorf, L. Eklundh, P. Schubert, A. Ekberg, C. Sigsgaard, T. R. Christensen, and L. Ström Biogeosciences Discuss., 7, 1101–1129, https://doi.org/10.5194/bgd-7-1101-2010,https://doi.org/10.5194/bgd-7-1101-2010,2010
Revised manuscript not accepted (discussion: closed, 5 comments) 02 Feb 2010 Nitrogen storage and variability in paddy soils of China J. S. Lin, X. Z. Shi, D. S. Yu, D. C. Weindorf, H. J. Wang, Y. C. Zhao, W. X. Sun, and Q. H. Liu Biogeosciences Discuss., 7, 855–877, https://doi.org/10.5194/bgd-7-855-2010,https://doi.org/10.5194/bgd-7-855-2010,2010
Preprint withdrawn (discussion: closed, 6 comments) 02 Feb 2010 VOC emissions from dry leaf litter and their dependenceon temperature
L. Derendorp, R. Holzinger, A. Wishkerman, F. Keppler, and T.Röckmann
Biogeosciences Discuss., 7, 823–854, https://doi.org/10.5194/bgd-7-823-2010,https://doi.org/10.5194/bgd-7-823-2010,2010
Revised manuscript not accepted (discussion: closed, 7 comments) 21 Jan 2010 Alkenone-based temperature patterns along the eastern South Pacific Coastal Ocean: the effect of upwelling and advection on the sedimentary alkenone unsaturation-index (_U_37_K_') J. A. Placencia, J. Garcés-Vargas, C. B. Lange, and D. Hebbeln Biogeosciences Discuss., 7, 545–564, https://doi.org/10.5194/bgd-7-545-2010,https://doi.org/10.5194/bgd-7-545-2010,2010
Revised manuscript not accepted (discussion: closed, 6 comments) 05 Jan 2010 Vertical patterns of soil carbon, nitrogen and carbon: nitrogen stoichiometry in Tibetan grasslands Y. H. Yang, J. Y. Fang, D. L. Guo, C. J. Ji, and W. H. Ma Biogeosciences Discuss., 7, 1–24, https://doi.org/10.5194/bgd-7-1-2010,https://doi.org/10.5194/bgd-7-1-2010,2010
Revised manuscript not accepted (discussion: closed, 4 comments) 16 Nov 2009 Fast and accurate irradiance calculations for ecosystemmodels
C. D. Mobley, L. K. Sundman, W. P. Bissett, and B. Cahill Biogeosciences Discuss., 6, 10625–10662, https://doi.org/10.5194/bgd-6-10625-2009,https://doi.org/10.5194/bgd-6-10625-2009,2009
Revised manuscript has not been submitted (discussion: closed, 4comments)
11 Nov 2009 Reducing impacts of systematic errors in the observation data on inversing ecosystem model parameters using different normalization methods L. Zhang, M. Xu, M. Huang, and G. Yu Biogeosciences Discuss., 6, 10447–10477, https://doi.org/10.5194/bgd-6-10447-2009,https://doi.org/10.5194/bgd-6-10447-2009,2009
Revised manuscript has not been submitted (discussion: closed, 6comments)
28 Oct 2009 Local ecosystem feedbacks and critical transitions in theclimate
M. Rietkerk, V. Brovkin, P. M. van Bodegom, M. Claussen, S. C. Dekker, H. A. Dijkstra, S. V. Goryachkin, P. Kabat, E. H. van Nes, A.-M. Neutel, S. E. Nicholson, C. Nobre, V. Petoukhov, A. Provenzale, M. Scheffer, and S. I. Seneviratne Biogeosciences Discuss., 6, 10121–10136, https://doi.org/10.5194/bgd-6-10121-2009,https://doi.org/10.5194/bgd-6-10121-2009,2009
Revised manuscript has not been submitted (discussion: closed, 3comments)
27 Oct 2009 Seasonal and interannual study of volatile reduced sulfur compounds (VRSC) in coastal environment: the Bay of Quiberon(Brittany, France)
A. Cozic-Houly, E. Viollier, G. Sarazin, and J. Knoery Biogeosciences Discuss., 6, 10057–10088, https://doi.org/10.5194/bgd-6-10057-2009,https://doi.org/10.5194/bgd-6-10057-2009,2009
Revised manuscript not accepted (discussion: closed, 4 comments) 22 Oct 2009 Small scale spatial heterogeneity of soil respiration in an old growth temperate deciduous forest A. Jordan, G. Jurasinski, and S. Glatzel Biogeosciences Discuss., 6, 9977–10005, https://doi.org/10.5194/bgd-6-9977-2009,https://doi.org/10.5194/bgd-6-9977-2009,2009
Revised manuscript not accepted (discussion: closed, 3 comments) 29 Sep 2009 Forest floor CO2 flux measurements with a dark-lightchamber
H. J. M. Lankreijer, A. Lindroth, M. Strömgren, L. Kulmala, and J.Pumpanen
Biogeosciences Discuss., 6, 9301–9329, https://doi.org/10.5194/bgd-6-9301-2009,https://doi.org/10.5194/bgd-6-9301-2009,2009
Revised manuscript has not been submitted (discussion: closed, 2comments)
24 Sep 2009 Effects of thinning and fertilization on soil respiration in a cottonwood plantation in Iceland J. Á. Jónsson and B. D. Sigurdsson Biogeosciences Discuss., 6, 9257–9278, https://doi.org/10.5194/bgd-6-9257-2009,https://doi.org/10.5194/bgd-6-9257-2009,2009
Revised manuscript not accepted (discussion: closed, 4 comments) 21 Sep 2009 Surface energy exchanges above two grassland ecosystems on the Qinghai-Tibetan Plateau S. Liu, S.-G. Li, G.-R. Yu, X.-M. Sun, L.-M. Zhang, Z.-M. Hu, Y.-N.Li, and X.-Z. Zhang
Biogeosciences Discuss., 6, 9161–9192, https://doi.org/10.5194/bgd-6-9161-2009,https://doi.org/10.5194/bgd-6-9161-2009,2009
Revised manuscript not accepted (discussion: closed, 6 comments) 10 Aug 2009 Enhanced biological carbon consumption in a high CO2 ocean: a revised estimate of the atmospheric uptake efficiency R. Matear and B. McNeil Biogeosciences Discuss., 6, 8101–8128, https://doi.org/10.5194/bgd-6-8101-2009,https://doi.org/10.5194/bgd-6-8101-2009,2009
Revised manuscript has not been submitted (discussion: closed, 3comments)
23 Jul 2009 Modeling the variability in annual carbon fluxes related to biological soil crusts in a Mediterranean shrubland B. Wilske, J. Burgheimer, K. Maseyk, A. Karnieli, E. Zaady, M. O. Andreae, D. Yakir, and J. Kesselmeier Biogeosciences Discuss., 6, 7295–7324, https://doi.org/10.5194/bgd-6-7295-2009,https://doi.org/10.5194/bgd-6-7295-2009,2009
Revised manuscript not accepted (discussion: closed, 4 comments) 14 Jul 2009 Regionalization of turbulent fluxes by combining aircraft measurements with footprint analysis T. El-Madany, H. Geiß, A. Schmidt, and O. Klemm Biogeosciences Discuss., 6, 7017–7051, https://doi.org/10.5194/bgd-6-7017-2009,https://doi.org/10.5194/bgd-6-7017-2009,2009
Revised manuscript not accepted (discussion: closed, 3 comments) 14 Jul 2009 Microbiotic crusts on soil, rock and plants: neglected major players in the global cycles of carbon and nitrogen? W. Elbert, B. Weber, B. Büdel, M. O. Andreae, and U. Pöschl Biogeosciences Discuss., 6, 6983–7015, https://doi.org/10.5194/bgd-6-6983-2009,https://doi.org/10.5194/bgd-6-6983-2009,2009
Preprint withdrawn (discussion: closed, 6 comments) 06 Jul 2009 Linking the lithogenic, atmospheric, and biogenic cycles of silicate, carbonate, and organic carbon in the ocean S. V. Smith and J.-P. Gattuso Biogeosciences Discuss., 6, 6579–6599, https://doi.org/10.5194/bgd-6-6579-2009,https://doi.org/10.5194/bgd-6-6579-2009,2009
Revised manuscript not accepted (discussion: closed, 6 comments) 24 Jun 2009 Contribution of root and rhizosphere respiration to the annual variation of carbon balance of a boreal Scots pine forest J. F. J. Korhonen, J. Pumpanen, P. Kolari, E. Juurola, and E. Nikinmaa Biogeosciences Discuss., 6, 6179–6203, https://doi.org/10.5194/bgd-6-6179-2009,https://doi.org/10.5194/bgd-6-6179-2009,2009
Revised manuscript not accepted (discussion: closed, 6 comments) 24 Jun 2009 Measurements of soil respiration and simple models dependent on moisture and temperature for an Amazonian southwesttropical forest
F. B. Zanchi, H. R. da Rocha, H. C. de Freitas, B. Kruijt, M. J. Waterloo, and A. O. Manzi Biogeosciences Discuss., 6, 6147–6177, https://doi.org/10.5194/bgd-6-6147-2009,https://doi.org/10.5194/bgd-6-6147-2009,2009
Revised manuscript not accepted (discussion: closed, 6 comments) 04 Jun 2009 Mapping landscape scale variations of forest structure, biomass, and productivity in Amazonia S. Saatchi, Y. Malhi, B. Zutta, W. Buermann, L. O. Anderson, A. M. Araujo, O. L. Phillips, J. Peacock, H. ter Steege, G. Lopez Gonzalez, T. Baker, L. Arroyo, S. Almeida, N. Higuchi, T. Killeen, A. Monteagudo, D. Neill, N. Pitman, A. Prieto, R. Salomão, N. Silva, R. Vásquez Martínez, W. Laurance, and H. A. Ramírez Biogeosciences Discuss., 6, 5461–5505, https://doi.org/10.5194/bgd-6-5461-2009,https://doi.org/10.5194/bgd-6-5461-2009,2009
Revised manuscript has not been submitted (discussion: closed, 2comments)
28 May 2009 Carbon fixation prediction during a bloom of _Emiliania huxleyi_ is highly sensitive to the assumed regulation mechanism O. Bernard, A. Sciandra, and S. Rabouille Biogeosciences Discuss., 6, 5339–5372, https://doi.org/10.5194/bgd-6-5339-2009,https://doi.org/10.5194/bgd-6-5339-2009,2009
Revised manuscript not accepted (discussion: closed, 5 comments) 12 May 2009 Response of _Halimeda_ to ocean acidification: field andlaboratory evidence
L. L. Robbins, P. O. Knorr, and P. Hallock Biogeosciences Discuss., 6, 4895–4918, https://doi.org/10.5194/bgd-6-4895-2009,https://doi.org/10.5194/bgd-6-4895-2009,2009
Revised manuscript not accepted (discussion: closed, 4 comments) 06 May 2009 Influence of hydrological fluxes on bio-geochemical processes in a peatland N. Bougon, L. Aquilina, C. Auterives, and P. Vandenkoornhuyse Biogeosciences Discuss., 6, 4829–4863, https://doi.org/10.5194/bgd-6-4829-2009,https://doi.org/10.5194/bgd-6-4829-2009,2009
Revised manuscript not accepted (discussion: closed, 4 comments) 04 May 2009 Seasonal pH and aragonite saturation horizons in the Gulf of Alaska during the North Pacific Survey, 1956–1957 S. McKinnell and J. R. Christian Biogeosciences Discuss., 6, 4587–4602, https://doi.org/10.5194/bgd-6-4587-2009,https://doi.org/10.5194/bgd-6-4587-2009,2009
Revised manuscript not accepted (discussion: closed, 5 comments) 29 Apr 2009 An upgraded carbon-based method to estimate the anthropogenic fraction of dissolved CO2 in the Atlantic Ocean M. Vázquez-Rodríguez, X. A. Padin, A. F. Ríos, R. G. J. Bellerby,and F. F. Pérez
Biogeosciences Discuss., 6, 4527–4571, https://doi.org/10.5194/bgd-6-4527-2009,https://doi.org/10.5194/bgd-6-4527-2009,2009
Revised manuscript not accepted (discussion: closed, 6 comments) 15 Apr 2009 Impacts of elevated CO2 on phytoplankton community composition and organic carbon dynamics in nutrient-depleted OkhotskSea surface waters
T. Yoshimura, J. Nishioka, K. Suzuki, H. Hattori, H. Kiyosawa, and Y.W. Watanabe
Biogeosciences Discuss., 6, 4143–4163, https://doi.org/10.5194/bgd-6-4143-2009,https://doi.org/10.5194/bgd-6-4143-2009,2009
Revised manuscript not accepted (discussion: closed, 5 comments) 01 Apr 2009 Conditional CO2 flux analysis of a managed grassland with the aid of stable isotopes M. J. Zeeman, B. Tuzson, L. Emmenegger, A. Knohl, N. Buchmann, and W.Eugster
Biogeosciences Discuss., 6, 3481–3510, https://doi.org/10.5194/bgd-6-3481-2009,https://doi.org/10.5194/bgd-6-3481-2009,2009
Revised manuscript has not been submitted (discussion: closed, 4comments)
30 Mar 2009 Turbulence in a coastal Mediterranean area: surface fluxes and related parameters at Castel Porziano, Italy S. A. Cieslik, G. Gerosa, A. Finco, G. Matteucci, N. Cape, and P.Misztal
Biogeosciences Discuss., 6, 3355–3372, https://doi.org/10.5194/bgd-6-3355-2009,https://doi.org/10.5194/bgd-6-3355-2009,2009
Revised manuscript has not been submitted (discussion: closed, 2comments)
18 Mar 2009 Impact of CO2-driven ocean acidification on invertebrates early life-history – What we know, what we need to know and what wecan do
S. Dupont and M. C. Thorndyke Biogeosciences Discuss., 6, 3109–3131, https://doi.org/10.5194/bgd-6-3109-2009,https://doi.org/10.5194/bgd-6-3109-2009,2009
Revised manuscript has not been submitted (discussion: closed, 4comments)
11 Mar 2009 Carbon dioxide and methane annual emissions from two boreal reservoirs and nearby lakes in Quebec, Canada M. Demarty, J. Bastien, and A. Tremblay Biogeosciences Discuss., 6, 2939–2963, https://doi.org/10.5194/bgd-6-2939-2009,https://doi.org/10.5194/bgd-6-2939-2009,2009
Revised manuscript not accepted (discussion: closed, 4 comments) 11 Mar 2009 A comparison of CO2 fluxes via eddy covariance measurements with model predictions in a dominant subtropical forestecosystem
J.-H. Yan, G.-Y. Zhou, Y.-L. Li, D.-Q. Zhang, D. Otieno, and J.Tenhunen
Biogeosciences Discuss., 6, 2913–2937, https://doi.org/10.5194/bgd-6-2913-2009,https://doi.org/10.5194/bgd-6-2913-2009,2009
Revised manuscript not accepted (discussion: closed, 6 comments) 11 Mar 2009 Seasonal variation in ecosystem parameters derived fromFLUXNET data
M. Groenendijk, M. K. van der Molen, and A. J. Dolman Biogeosciences Discuss., 6, 2863–2912, https://doi.org/10.5194/bgd-6-2863-2009,https://doi.org/10.5194/bgd-6-2863-2009,2009
Revised manuscript has not been submitted (discussion: closed, 3comments)
03 Mar 2009 Effect of land use on carbon dioxide, water vapour and energy exchange over terrestrial ecosystems in Southwestern France during the CERES campaign N. Jarosz, P. Béziat, J. M. Bonnefond, Y. Brunet, J. C. Calvet, E. Ceschia, J. A. Elbers, R. W. A. Hutjes, and O. Traullé Biogeosciences Discuss., 6, 2755–2784, https://doi.org/10.5194/bgd-6-2755-2009,https://doi.org/10.5194/bgd-6-2755-2009,2009
Revised manuscript not accepted (discussion: closed, 4 comments) 24 Feb 2009 Calcification, a physiological process to be considered in the context of the whole organism H. S. Findlay, H. L. Wood, M. A. Kendall, J. I. Spicer, R. J. Twitchett, and S. Widdicombe Biogeosciences Discuss., 6, 2267–2284, https://doi.org/10.5194/bgd-6-2267-2009,https://doi.org/10.5194/bgd-6-2267-2009,2009
Manuscript not accepted for further review (discussion: closed, 4comments)
06 Feb 2009 A process-based model to estimate gas exchange and monoterpene emission rates in the mediterranean maquis – comparisons between modelled and measured fluxes at different scales M. Vitale, G. Matteucci, S. Fares, and B. Davison Biogeosciences Discuss., 6, 1747–1776, https://doi.org/10.5194/bgd-6-1747-2009,https://doi.org/10.5194/bgd-6-1747-2009,2009
Manuscript not accepted for further review (discussion: closed, 4comments)
30 Jan 2009 The effects of management on ammonia fluxes over a cut grassland as measured by use of dynamic chambers M. David, R. Roche, M. Mattsson, M. A. Sutton, U. Dämmgen, J. K. Schjoerring, and P. Cellier Biogeosciences Discuss., 6, 1599–1623, https://doi.org/10.5194/bgd-6-1599-2009,https://doi.org/10.5194/bgd-6-1599-2009,2009
Revised manuscript has not been submitted (discussion: closed, 2comments)
30 Jan 2009 Simulating the optical properties of phytoplankton cells using a two-layered spherical geometry S. Bernard, T. A. Probyn, and A. Quirantes Biogeosciences Discuss., 6, 1497–1563, https://doi.org/10.5194/bgd-6-1497-2009,https://doi.org/10.5194/bgd-6-1497-2009,2009
Revised manuscript has not been submitted (discussion: closed, 3comments)
23 Jan 2009 Short scale (6 h) temporal variation of sinking fluxes of planktonic and terrigeneous lipids at 200 m in the NW MediterraneanSea
L. Méjanelle and J. Dachs Biogeosciences Discuss., 6, 1229–1265, https://doi.org/10.5194/bgd-6-1229-2009,https://doi.org/10.5194/bgd-6-1229-2009,2009
Preprint withdrawn (discussion: closed, 6 comments) 21 Jan 2009 Contribution of riverine nutrients to the silicon biogeochemistry of the global ocean – a model study C. Y. Bernard, H. H. Dürr, C. Heinze, J. Segschneider, and E.Maier-Reimer
Biogeosciences Discuss., 6, 1091–1119, https://doi.org/10.5194/bgd-6-1091-2009,https://doi.org/10.5194/bgd-6-1091-2009,2009
Preprint withdrawn (discussion: closed, 2 comments) 16 Jan 2009 A one-month study of the zooplankton community at a fixed station in the Ligurian Sea: the potential impact of the species composition on the mineralization of organic matter L. Mousseau, D. Lefevre, F. Narcy, P. Nival, and V. Andersen Biogeosciences Discuss., 6, 995–1019, https://doi.org/10.5194/bgd-6-995-2009,https://doi.org/10.5194/bgd-6-995-2009,2009
Revised manuscript has not been submitted (discussion: closed, 4comments)
16 Jan 2009 Carbon cycling in the Arctic Archipelago: the export of Pacific carbon to the North Atlantic E. H. Shadwick, T. Papakyriakou, A. E. F. Prowe, D. Leong, S. A. Moore, and H. Thomas Biogeosciences Discuss., 6, 971–994, https://doi.org/10.5194/bgd-6-971-2009,https://doi.org/10.5194/bgd-6-971-2009,2009
Manuscript not accepted for further review (discussion: closed, 5comments)
13 Jan 2009 Soil carbon stocks in ecoregions of Africa M. Henry, R. Valentini, and M. Bernoux Biogeosciences Discuss., 6, 797–823, https://doi.org/10.5194/bgd-6-797-2009,https://doi.org/10.5194/bgd-6-797-2009,2009
Manuscript not accepted for further review (discussion: closed, 4comments)
13 Jan 2009 Nitrate and dissolved nitrous oxide in groundwater within cropped fields and riparian buffers D.-G. Kim, T. M. Isenhart, T. B. Parkin, R. C. Schultz, and T. E.Loynachan
Biogeosciences Discuss., 6, 651–685, https://doi.org/10.5194/bgd-6-651-2009,https://doi.org/10.5194/bgd-6-651-2009,2009
Revised manuscript has not been submitted (discussion: closed, 3comments)
13 Jan 2009 Nitrous oxide emissions from riparian forest buffers, warm-season and cool-season grass filters, and crop fields D.-G. Kim, T. M. Isenhart, T. B. Parkin, R. C. Schultz, T. E. Loynachan, and J. W. Raich Biogeosciences Discuss., 6, 607–650, https://doi.org/10.5194/bgd-6-607-2009,https://doi.org/10.5194/bgd-6-607-2009,2009
Revised manuscript has not been submitted (discussion: closed, 6comments)
09 Jan 2009 Effects of pH on aquatic biodegradation processes R. F. Krachler, R. Krachler, A. Stojanovic, B. Wielander, and A.Herzig
Biogeosciences Discuss., 6, 491–514, https://doi.org/10.5194/bgd-6-491-2009,https://doi.org/10.5194/bgd-6-491-2009,2009
Manuscript not accepted for further review (discussion: closed, 4comments)
06 Jan 2009 Th measured particle export from surface waters in north-western Mediterranean: comparison of spring and autumn periodsCC BY 4.0
Details
Copyright © 2024 ArchiveBay.com. All rights reserved. Terms of Use | Privacy Policy | DMCA | 2021 | Feedback | Advertising | RSS 2.0