Articles | Volume 16, issue 22
https://doi.org/10.5194/bg-16-4451-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-4451-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
25 Nov 2019
Research article |
| 25 Nov 2019
| 25 Nov 2019
Validation of carbon isotope fractionation in algal lipids as a pCO2 proxy using a natural CO2 seep (Shikine Island, Japan)
Caitlyn R. Witkowski
CORRESPONDING AUTHOR
Department of Marine Microbiology and Biogeochemistry, Royal
Netherlands Institute for Sea Research, Den Burg (Texel), 1790AB, and
Utrecht University, the Netherlands
present address: School of Earth Sciences, University of Bristol, Bristol,
UK
Sylvain Agostini
Shimoda Marine Research Center, University of Tsukuba, Shimoda,
415-0025, Japan
Ben P. Harvey
Shimoda Marine Research Center, University of Tsukuba, Shimoda,
415-0025, Japan
Marcel T. J. van der Meer
Department of Marine Microbiology and Biogeochemistry, Royal
Netherlands Institute for Sea Research, Den Burg (Texel), 1790AB, and
Utrecht University, the Netherlands
Jaap S. Sinninghe Damsté
Department of Marine Microbiology and Biogeochemistry, Royal
Netherlands Institute for Sea Research, Den Burg (Texel), 1790AB, and
Utrecht University, the Netherlands
Department of Geosciences, Utrecht University, Utrecht, 3508 TA, the
Netherlands
Stefan Schouten
Department of Marine Microbiology and Biogeochemistry, Royal
Netherlands Institute for Sea Research, Den Burg (Texel), 1790AB, and
Utrecht University, the Netherlands
Department of Geosciences, Utrecht University, Utrecht, 3508 TA, the
Netherlands
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Mak A. Saito, Jaclyn K. Saunders, Matthew R. McIlvin, Erin M. Bertrand, John A. Breier, Margaret Mars Brisbin, Sophie M. Colston, Jaimee R. Compton, Tim J. Griffin, W. Judson Hervey, Robert L. Hettich, Pratik D. Jagtap, Michael Janech, Rod Johnson, Rick Keil, Hugo Kleikamp, Dagmar Leary, Lennart Martens, J. Scott P. McCain, Eli Moore, Subina Mehta, Dawn M. Moran, Jaqui Neibauer, Benjamin A. Neely, Michael V. Jakuba, Jim Johnson, Megan Duffy, Gerhard J. Herndl, Richard Giannone, Ryan Mueller, Brook L. Nunn, Martin Pabst, Samantha Peters, Andrew Rajczewski, Elden Rowland, Brian Searle, Tim Van Den Bossche, Gary J. Vora, Jacob R. Waldbauer, Haiyan Zheng, and Zihao Zhao
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The ability to assess the functional capabilities of microbes in the environment is of increasing interest. Metaproteomics, the ability to measure proteins across microbial populations, has been increasing in capability and popularity in recent years. Here, an international team of scientists conducted an intercomparison study using samples collected from the North Atlantic Ocean and observed consistency in the peptides and proteins identified, their functions, and taxonomic origins.
Hanxiao Wang, Zhifei Liu, Jiaying Li, Baozhi Lin, Yulong Zhao, Xiaodong Zhang, Junyuan Cao, Jingwen Zhang, Hongzhe Song, and Wenzhuo Wang
Biogeosciences, 20, 5109–5123, https://doi.org/10.5194/bg-20-5109-2023, https://doi.org/10.5194/bg-20-5109-2023, 2023
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The sinking of zooplankton fecal pellets is a key process in the marine biological carbon pump. This study presents carbon export of four shapes of fecal pellets from two time-series sediment traps in the South China Sea. The results show that the sinking fate of fecal pellets is regulated by marine primary productivity, deep-dwelling zooplankton community, and deep-sea currents in the tropical marginal sea, thus providing a new perspective for exploring the carbon cycle in the world ocean.
Colleen L. Hoffman, Patrick J. Monreal, Justine B. Albers, Alastair J. M. Lough, Alyson E. Santoro, Travis Mellett, Kristen N. Buck, Alessandro Tagliabue, Maeve C. Lohan, Joseph A. Resing, and Randelle M. Bundy
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Hydrothermally-derived iron can be transported thousands of kilometers away from deep-sea vents, representing a significant flux of vital micronutrients to the ocean. However, the mechanisms that support the stabilization and transport of dissolved iron remain elusive. Using electrochemical methods, advanced mass spectrometry techniques, and genomic tools we demonstrate that strong microbially-produced ligands appear to exert an important control on plume iron biogeochemistry and dissemination.
Rebecca J. Chmiel, Riss M. Kell, Deepa Rao, Dawn M. Moran, Giacomo R. DiTullio, and Mak A. Saito
Biogeosciences, 20, 3997–4027, https://doi.org/10.5194/bg-20-3997-2023, https://doi.org/10.5194/bg-20-3997-2023, 2023
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Cobalt is an important micronutrient for plankton, yet it is often scarce throughout the oceans. A 2017/2018 expedition to coastal Antarctica, including regions of the Amundsen Sea and the Ross Sea, discovered lower concentrations of cobalt compared to two past expeditions in 2005 and 2006, particularly for the type of cobalt preferred as a nutrient by phytoplankton. This loss may be due to changing inputs of other nutrients, causing higher uptake of cobalt by plankton over the last decade.
Alessio Leins, Danaé Bregnard, Andrea Vieth-Hillebrand, Stefanie Poetz, Florian Eichinger, Guillaume Cailleau, Pilar Junier, and Simona Regenspurg
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-159, https://doi.org/10.5194/bg-2023-159, 2023
Revised manuscript accepted for BG
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Organic matter and microbial fluid analyses are rarely taken into account in the geothermal industry and research. However, they can have a significant effect on the efficiency of geothermal power production. We discovered a high variety in organic compound composition in our samples and were able to differentiate it with regard to various sources (e.g. artificial and biogenic). Furthermore, the microbial diversity undergoes significant changes within the flow path of a geothermal power plant.
Emily B. Graham, Hyun-Seob Song, Samantha Grieger, Vanessa A. Garayburu-Caruso, James C. Stegen, Kevin D. Bladon, and Allison N. Myers-Pigg
Biogeosciences, 20, 3449–3457, https://doi.org/10.5194/bg-20-3449-2023, https://doi.org/10.5194/bg-20-3449-2023, 2023
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Intensifying wildfires are increasing pyrogenic organic matter (PyOM) production and its impact on water quality. Recent work indicates that PyOM may have a greater impact on aquatic biogeochemistry than previously assumed, driven by higher bioavailability. We provide a full assessment of the potential bioavailability of PyOM across its chemical spectrum. We indicate that PyOM can be actively transformed within the river corridor and, therefore, may be a growing source of riverine C emissions.
Nora Richter, Ellen C. Hopmans, Danica Mitrović, Pedro M. Raposeiro, Vítor Gonçalves, Ana C. Costa, Linda A. Amaral-Zettler, Laura Villanueva, and Darci Rush
Biogeosciences, 20, 2065–2098, https://doi.org/10.5194/bg-20-2065-2023, https://doi.org/10.5194/bg-20-2065-2023, 2023
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Bacteriohopanepolyols (BHPs) are a diverse class of lipids produced by bacteria across a wide range of environments. This study characterizes the diversity of BHPs in lakes and coastal lagoons in the Azores Archipelago, as well as a co-culture enriched for methanotrophs. We highlight the potential of BHPs as taxonomic markers for bacteria associated with certain ecological niches, which can be preserved in sedimentary records.
Andrea Scheibe, Carlos A. Sierra, and Marie Spohn
Biogeosciences, 20, 827–838, https://doi.org/10.5194/bg-20-827-2023, https://doi.org/10.5194/bg-20-827-2023, 2023
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We explored carbon cycling in soils in three climate zones in Chile down to a depth of 6 m, using carbon isotopes. Our results show that microbial activity several meters below the soil surface is mostly fueled by recently fixed carbon and that strong decomposition of soil organic matter only occurs in the upper decimeters of the soils. The study shows that different layers of the critical zone are tightly connected and that processes in the deep soil depend on recently fixed carbon.
Melissa Sophia Schwab, Hannah Gies, Chantal Valérie Freymond, Maarten Lupker, Negar Haghipour, and Timothy Ian Eglinton
Biogeosciences, 19, 5591–5616, https://doi.org/10.5194/bg-19-5591-2022, https://doi.org/10.5194/bg-19-5591-2022, 2022
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The majority of river studies focus on headwater or floodplain systems, while often neglecting intermediate river segments. Our study on the subalpine Sihl River bridges the gap between streams and lowlands and demonstrates that moderately steep river segments are areas of significant instream alterations, modulating the export of organic carbon over short distances.
Lisa Noll, Shasha Zhang, Qing Zheng, Yuntao Hu, Florian Hofhansl, and Wolfgang Wanek
Biogeosciences, 19, 5419–5433, https://doi.org/10.5194/bg-19-5419-2022, https://doi.org/10.5194/bg-19-5419-2022, 2022
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Cleavage of proteins to smaller nitrogen compounds allows microorganisms and plants to exploit the largest nitrogen reservoir in soils and is considered the bottleneck in soil organic nitrogen cycling. Results from soils covering a European transect show that protein turnover is constrained by soil geochemistry, shifts in climate and associated alterations in soil weathering and should be considered as a driver of soil nitrogen availability with repercussions on carbon cycle processes.
Muhammed Fatih Sert, Helge Niemann, Eoghan P. Reeves, Mats A. Granskog, Kevin P. Hand, Timo Kekäläinen, Janne Jänis, Pamela E. Rossel, Bénédicte Ferré, Anna Silyakova, and Friederike Gründger
Biogeosciences, 19, 2101–2120, https://doi.org/10.5194/bg-19-2101-2022, https://doi.org/10.5194/bg-19-2101-2022, 2022
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We investigate organic matter composition in the Arctic Ocean water column. We collected seawater samples from sea ice to deep waters at six vertical profiles near an active hydrothermal vent and its plume. In comparison to seawater, we found that the organic matter in waters directly affected by the hydrothermal plume had different chemical composition. We suggest that hydrothermal processes may influence the organic matter distribution in the deep ocean.
Charlotte Haugk, Loeka L. Jongejans, Kai Mangelsdorf, Matthias Fuchs, Olga Ogneva, Juri Palmtag, Gesine Mollenhauer, Paul J. Mann, P. Paul Overduin, Guido Grosse, Tina Sanders, Robyn E. Tuerena, Lutz Schirrmeister, Sebastian Wetterich, Alexander Kizyakov, Cornelia Karger, and Jens Strauss
Biogeosciences, 19, 2079–2094, https://doi.org/10.5194/bg-19-2079-2022, https://doi.org/10.5194/bg-19-2079-2022, 2022
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Buried animal and plant remains (carbon) from the last ice age were freeze-locked in permafrost. At an extremely fast eroding permafrost cliff in the Lena Delta (Siberia), we found this formerly frozen carbon well preserved. Our results show that ongoing degradation releases substantial amounts of this carbon, making it available for future carbon emissions. This mobilisation at the studied cliff and also similarly eroding sites bear the potential to affect rivers and oceans negatively.
Aleksandar I. Goranov, Andrew S. Wozniak, Kyle W. Bostick, Andrew R. Zimmerman, Siddhartha Mitra, and Patrick G. Hatcher
Biogeosciences, 19, 1491–1514, https://doi.org/10.5194/bg-19-1491-2022, https://doi.org/10.5194/bg-19-1491-2022, 2022
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Wildfire-derived molecules are ubiquitous in the aquatic environment, but their biological fate remains understudied. We have evaluated the compositional changes that occur to wildfire-derived molecules after incubation with soil microbes. We observe a significant degradation but also a production of numerous new labile molecules. Our results indicate that wildfire-derived molecules can be broken down and the carbon and nitrogen therein can be incorporated into microbial food webs.
Edgart Flores, Sebastian I. Cantarero, Paula Ruiz-Fernández, Nadia Dildar, Matthias Zabel, Osvaldo Ulloa, and Julio Sepúlveda
Biogeosciences, 19, 1395–1420, https://doi.org/10.5194/bg-19-1395-2022, https://doi.org/10.5194/bg-19-1395-2022, 2022
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In this study, we investigate the chemical diversity and abundance of microbial lipids as markers of organic matter sources in the deepest points of the Atacama Trench sediments and compare them to similar lipid stocks in shallower surface sediments and in the overlying water column. We evaluate possible organic matter provenance and some potential chemical adaptations of the in situ microbial community to the extreme conditions of high hydrostatic pressure in hadal realm.
Birgit Gaye, Niko Lahajnar, Natalie Harms, Sophie Anna Luise Paul, Tim Rixen, and Kay-Christian Emeis
Biogeosciences, 19, 807–830, https://doi.org/10.5194/bg-19-807-2022, https://doi.org/10.5194/bg-19-807-2022, 2022
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Amino acids were analyzed in a large number of samples of particulate and dissolved organic matter from coastal regions and the open ocean. A statistical analysis produced two new biogeochemical indicators. An indicator of sinking particle and sediment degradation (SDI) traces the degradation of organic matter from the surface waters into the sediments. A second indicator shows the residence time of suspended matter in the ocean (RTI).
Zoë R. van Kemenade, Laura Villanueva, Ellen C. Hopmans, Peter Kraal, Harry J. Witte, Jaap S. Sinninghe Damsté, and Darci Rush
Biogeosciences, 19, 201–221, https://doi.org/10.5194/bg-19-201-2022, https://doi.org/10.5194/bg-19-201-2022, 2022
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Anaerobic ammonium oxidation (anammox) is an important nitrogen-removal process in the ocean. We assess the distribution of bacteriohopanetetrol-x (BHT-x), used to trace past anammox, along a redox gradient in the water column of the Benguela upwelling system. BHT-x / BHT ratios of >0.18 correspond to the presence of living anammox bacteria and oxygen levels <50 μmol L−1. This allows for a more robust application of BHT-x to trace past marine anammox and deoxygenation in dynamic marine systems.
Jia-Jang Hung, Ching-Han Tung, Zong-Ying Lin, Yuh-ling Lee Chen, Shao-Hung Peng, Yen-Huei Lin, and Li-Shan Tsai
Biogeosciences, 18, 5141–5162, https://doi.org/10.5194/bg-18-5141-2021, https://doi.org/10.5194/bg-18-5141-2021, 2021
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We report measured active and passive fluxes and their controlling mechanisms in the northern South China Sea (NSCS). The total fluxes were higher than most reports in open oceans, indicating the significance of NSCS in atmospheric CO2 uptake and in storing that CO2 in the ocean’s interior. Winter cooling and extreme events enhanced nutrient availability and elevated fluxes. Global warming may have profound impacts on reducing ocean’s uptake and storage of CO2 in subtropical–tropical oceans.
Jens Daniel Müller, Bernd Schneider, Ulf Gräwe, Peer Fietzek, Marcus Bo Wallin, Anna Rutgersson, Norbert Wasmund, Siegfried Krüger, and Gregor Rehder
Biogeosciences, 18, 4889–4917, https://doi.org/10.5194/bg-18-4889-2021, https://doi.org/10.5194/bg-18-4889-2021, 2021
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Based on profiling pCO2 measurements from a field campaign, we quantify the biomass production of a cyanobacteria bloom in the Baltic Sea, the export of which would foster deep water deoxygenation. We further demonstrate how this biomass production can be accurately reconstructed from long-term surface measurements made on cargo vessels in combination with modelled temperature profiles. This approach enables a better understanding of a severe concern for the Baltic’s good environmental status.
Alexander Braun, Marina Spona-Friedl, Maria Avramov, Martin Elsner, Federico Baltar, Thomas Reinthaler, Gerhard J. Herndl, and Christian Griebler
Biogeosciences, 18, 3689–3700, https://doi.org/10.5194/bg-18-3689-2021, https://doi.org/10.5194/bg-18-3689-2021, 2021
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It is known that CO2 fixation by photoautotrophic organisms is the major sink from the atmosphere. While biologists are aware that CO2 fixation also occurs in heterotrophic organisms, this route of inorganic carbon, and its quantitative role, is hardly recognized in biogeochemistry. We demonstrate that a considerable amount of CO2 is fixed annually through anaplerotic reactions in heterotrophic organisms, and a significant quantity of inorganic carbon is temporally sequestered in biomass.
Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Biogeosciences, 18, 3579–3603, https://doi.org/10.5194/bg-18-3579-2021, https://doi.org/10.5194/bg-18-3579-2021, 2021
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BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can influence them, and seasonality can affect the temperatures they record. We find a warm-season bias at 43 new high-latitude sites. We also present a new method that deconvolves the effects of temperature, pH, and conductivity and generate global calibrations for these variables. Our study provides new paleoclimate tools, insight into brGDGTs at the biochemical level, and a new method for future study.
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, 18, 3485–3504, https://doi.org/10.5194/bg-18-3485-2021, https://doi.org/10.5194/bg-18-3485-2021, 2021
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Long-term ocean temperature records are needed to fully understand the impact of West Antarctic Ice Sheet collapse. Glycerol dialkyl glycerol tetraethers (GDGTs) are powerful tools for reconstructing ocean temperature but can be difficult to apply to the Southern Ocean. Our results show active GDGT synthesis in relatively warm depths of the ocean. This research improves the application of GDGT palaeoceanographic proxies in the Southern Ocean.
Alec W. Armstrong, Leanne Powers, and Michael Gonsior
Biogeosciences, 18, 3367–3390, https://doi.org/10.5194/bg-18-3367-2021, https://doi.org/10.5194/bg-18-3367-2021, 2021
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Living things decay into organic matter, which can dissolve into water (like tea brewing). Tea receives its color by absorbing light. Similarly, this material absorbs light, which can then cause chemical reactions that change it. By measuring changes in these optical properties, we found that materials from some places are more sensitive to light than others. Comparing sensitivity to light helps us understand where these materials come from and what happens as they move through water.
Ben J. Fisher, Johan C. Faust, Oliver W. Moore, Caroline L. Peacock, and Christian März
Biogeosciences, 18, 3409–3419, https://doi.org/10.5194/bg-18-3409-2021, https://doi.org/10.5194/bg-18-3409-2021, 2021
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Organic carbon can be protected from microbial degradation in marine sediments through association with iron minerals on 1000-year timescales. Despite the importance of this carbon sink, our spatial and temporal understanding of iron-bound organic carbon interactions globally is poor. Here we show that caution must be applied when comparing quantification of iron-bound organic carbon extracted by different methods as the extraction strength and method specificity can be highly variable.
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, 18, 2465–2485, https://doi.org/10.5194/bg-18-2465-2021, https://doi.org/10.5194/bg-18-2465-2021, 2021
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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 is predominately sourced from in-lake production due to the catchment's limited terrestrial vegetation and elevation and that recent increases in algal production link with climate change.
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, 18, 1463–1479, https://doi.org/10.5194/bg-18-1463-2021, https://doi.org/10.5194/bg-18-1463-2021, 2021
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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.
Marcus P. S. Badger
Biogeosciences, 18, 1149–1160, https://doi.org/10.5194/bg-18-1149-2021, https://doi.org/10.5194/bg-18-1149-2021, 2021
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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.
Loes G. J. van Bree, Francien Peterse, Allix J. Baxter, Wannes De Crop, Sigrid van Grinsven, Laura Villanueva, Dirk Verschuren, and Jaap S. Sinninghe Damsté
Biogeosciences, 17, 5443–5463, https://doi.org/10.5194/bg-17-5443-2020, https://doi.org/10.5194/bg-17-5443-2020, 2020
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Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are used as a paleothermometer based on their temperature dependence in global soils, but aquatic production complicates their use in lakes. BrGDGTs in the water column of Lake Chala, East Africa, respond to oxygen conditions and mixing. Changes in their signal can be linked to bacterial community composition rather than membrane adaptation to changing conditions. Their integrated signal in the sediment reflects mean air temperature.
Alexandra N. Loginova, Andrew W. Dale, Frédéric A. C. Le Moigne, Sören Thomsen, Stefan Sommer, David Clemens, Klaus Wallmann, and Anja Engel
Biogeosciences, 17, 4663–4679, https://doi.org/10.5194/bg-17-4663-2020, https://doi.org/10.5194/bg-17-4663-2020, 2020
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We measured dissolved organic carbon (DOC), nitrogen (DON) and matter (DOM) optical properties in pore waters and near-bottom waters of the eastern tropical South Pacific off Peru. The difference between diffusion-driven and net fluxes of DOC and DON and qualitative changes in DOM optical properties suggested active microbial utilisation of the released DOM at the sediment–water interface. Our results suggest that the sediment release of DOM contributes to microbial processes in the area.
Gerard J. M. Versteegh, Alexander J. P. Houben, and Karin A. F. Zonneveld
Biogeosciences, 17, 3545–3561, https://doi.org/10.5194/bg-17-3545-2020, https://doi.org/10.5194/bg-17-3545-2020, 2020
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Anoxic sediments mostly contain much more organic matter than oxic ones, and therefore organic matter in anoxic settings is often considered to be preserved better than in oxic settings. However, through the analysis of the same fossil dinoflagellate cyst species from both oxic and anoxic settings, we show that at a molecular level the preservation in the oxic sediments may be better since in the anoxic setting the cyst macromolecule has been altered by postdepositional modification.
Jingjing Guo, Miriam Glendell, Jeroen Meersmans, Frédérique Kirkels, Jack J. Middelburg, and Francien Peterse
Biogeosciences, 17, 3183–3201, https://doi.org/10.5194/bg-17-3183-2020, https://doi.org/10.5194/bg-17-3183-2020, 2020
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The fluxes of soil organic carbon (OC) transport from land to sea are poorly constrained, mostly due to the lack of a specific tracer for soil OC. Here we evaluate the use of specific molecules derived from soil bacteria as a tracer for soil OC in a small river catchment. We find that the initial soil signal is lost upon entering the aquatic environment. However, the local environmental history of the catchment is reflected by these molecules in the lake sediments that act as their sink.
Zhuo-Yi Zhu, Joanne Oakes, Bradley Eyre, Youyou Hao, Edwin Sien Aun Sia, Shan Jiang, Moritz Müller, and Jing Zhang
Biogeosciences, 17, 2473–2485, https://doi.org/10.5194/bg-17-2473-2020, https://doi.org/10.5194/bg-17-2473-2020, 2020
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Samples were collected in August 2016 in the Rajang River and its estuary, with tropical forest in the river basin and peatland in the estuary. Organic matter composition was influenced by transportation in the river basin, whereas peatland added clear biodegraded parts to the fluvial organic matter, which implies modification of the initial lability and/or starting points in the subsequent degradation and alternation processes after the organic matter enters the sea.
Wenjie Xiao, Yasong Wang, Yongsheng Liu, Xi Zhang, Linlin Shi, and Yunping Xu
Biogeosciences, 17, 2135–2148, https://doi.org/10.5194/bg-17-2135-2020, https://doi.org/10.5194/bg-17-2135-2020, 2020
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The hadal zone (6–11 km depth) is the least explored habitat on Earth. We studied microbial branched glycerol dialkyl glycerol tetraethers (brGDGTs) in the Challenger Deep, Mariana Trench. One unique feature is the strong predominance of 6-methyl brGDGT, which likely reflects an adaption of brGDGT-producing bacteria to alkaline seawater and low temperature. BrGDGTs, with elemental and isotopic data, suggest an autochthonous product for brGDGT. A new approach is proposed for brGDGT sourcing.
Yuge Bai, Edisson Subdiaga, Stefan B. Haderlein, Heike Knicker, and Andreas Kappler
Biogeosciences, 17, 683–698, https://doi.org/10.5194/bg-17-683-2020, https://doi.org/10.5194/bg-17-683-2020, 2020
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Biogeochemical processes of SOM are key for greenhouse gas emission and water quality. We extracted SOM by water or by NaOH–HCl under oxic–anoxic conditions. Chemical and anoxic extractions lead to higher SOM electron exchange capacities, resulting in stimulation of microbial Fe(III) reduction. Therefore, aqueous pH-neutral SOM extracts should be used to reflect environmental SOM redox processes, and artifacts of chemical extractions need to be considered when evaluating SOM redox processes.
Yan Shen, Volker Thiel, Pablo Suarez-Gonzalez, Sebastiaan W. Rampen, and Joachim Reitner
Biogeosciences, 17, 649–666, https://doi.org/10.5194/bg-17-649-2020, https://doi.org/10.5194/bg-17-649-2020, 2020
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Today, sterols are widespread in plants, animals, and fungi but are almost absent in the oldest rocks. Microbial mats, representing the earliest complex ecosystems on Earth, were omnipresent in Precambrian marine environments and may have degraded the sterols at that time. Here we analyze the distribution of sterols through a microbial mat. This provides insight into how variations in biological and nonbiological factors affect the preservation of sterols in modern and ancient microbial mats.
Sarah Coffinet, Travis B. Meador, Lukas Mühlena, Kevin W. Becker, Jan Schröder, Qing-Zeng Zhu, Julius S. Lipp, Verena B. Heuer, Matthew P. Crump, and Kai-Uwe Hinrichs
Biogeosciences, 17, 317–330, https://doi.org/10.5194/bg-17-317-2020, https://doi.org/10.5194/bg-17-317-2020, 2020
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This study deals with two membrane lipids called BDGTs and PDGTs. Membrane lipids are molecules forming the cell envelope of all organisms. Different organisms produce different lipids thus they can be used to detect the presence of specific organisms in the environment. We analyzed the structure of these new lipids and looked for potential producers. We found that they are likely made by microbes emitting methane below the sediment surface and could be used to track these specific microbes.
Ying Wu, Kun Zhu, Jing Zhang, Moritz Müller, Shan Jiang, Aazani Mujahid, Mohd Fakharuddin Muhamad, and Edwin Sien Aun Sia
Biogeosciences, 16, 4517–4533, https://doi.org/10.5194/bg-16-4517-2019, https://doi.org/10.5194/bg-16-4517-2019, 2019
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Our understanding of terrestrial organic matter (TOM) in tropical peat-draining rivers remains limited, especially in Southeast Asia. We explored the characteristics of TOM via bulk parameters and lignin phenols of sediment in Malaysia. This showed that the most important plant source of the organic matter in these rivers is woody angiosperm C3 plants with limited diagenetic alteration. This slower degradation of TOM may be a link to higher total nitrogen content, especially for the small river.
Yongli Zhou, Patrick Martin, and Moritz Müller
Biogeosciences, 16, 2733–2749, https://doi.org/10.5194/bg-16-2733-2019, https://doi.org/10.5194/bg-16-2733-2019, 2019
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We found that peatlands in coastal Sarawak, Borneo, export extremely humified organic matter, which dominates the riverine organic matter pool and conservatively mixes with seawater, while the freshly produced fraction is low and stable in concentration at all salinities. We estimated that terrigenous fractions, which showed high photolability, still account for 20 % of the coastal dissolved organic carbon pool, implying the importance of peat-derived organic matter in the coastal carbon cycle.
Kristin Doering, Claudia Ehlert, Philippe Martinez, Martin Frank, and Ralph Schneider
Biogeosciences, 16, 2163–2180, https://doi.org/10.5194/bg-16-2163-2019, https://doi.org/10.5194/bg-16-2163-2019, 2019
Alexandra N. Loginova, Sören Thomsen, Marcus Dengler, Jan Lüdke, and Anja Engel
Biogeosciences, 16, 2033–2047, https://doi.org/10.5194/bg-16-2033-2019, https://doi.org/10.5194/bg-16-2033-2019, 2019
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High primary production in the Peruvian upwelling system is followed by rapid heterotrophic utilization of organic matter and supports the formation of one of the most intense oxygen minimum zones (OMZs) in the world. Here, we estimated vertical fluxes of oxygen and dissolved organic matter (DOM) from the surface to the OMZ. Our results suggest that DOM remineralization substantially reduces oxygen concentration in the upper water column and controls the shape of the upper oxycline.
Carolina Cisternas-Novoa, Frédéric A. C. Le Moigne, and Anja Engel
Biogeosciences, 16, 927–947, https://doi.org/10.5194/bg-16-927-2019, https://doi.org/10.5194/bg-16-927-2019, 2019
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We investigate the composition and vertical fluxes of POM in two deep basins of the Baltic Sea (GB: Gotland Basin and LD: Landsort Deep). The two basins showed different O2 regimes resulting from the intrusion of oxygen-rich water from the North Sea that ventilated the deep waters in GB, but not in LD.
In GB, O2 intrusions lead to a high abundance of manganese oxides that aggregate with POM, altering its composition and vertical flux and contributing to a higher POC transfer efficiency in GB.
Marina Zamanillo, Eva Ortega-Retuerta, Sdena Nunes, Pablo Rodríguez-Ros, Manuel Dall'Osto, Marta Estrada, Maria Montserrat Sala, and Rafel Simó
Biogeosciences, 16, 733–749, https://doi.org/10.5194/bg-16-733-2019, https://doi.org/10.5194/bg-16-733-2019, 2019
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Many marine microorganisms produce polysaccharide-rich transparent exopolymer particles (TEPs) for rather unknown reasons but with important consequences for the ocean carbon cycle, sea–air gas exchange and formation of organic aerosols. Here we compare surface–ocean distributions of TEPs and physical, chemical and biological variables along a N–S transect in the Atlantic Ocean. Our data suggest that phytoplankton and not bacteria are the main TEP producers, and solar radiation acts as a sink.
Michael Philben, Sara Butler, Sharon A. Billings, Ronald Benner, Kate A. Edwards, and Susan E. Ziegler
Biogeosciences, 15, 6731–6746, https://doi.org/10.5194/bg-15-6731-2018, https://doi.org/10.5194/bg-15-6731-2018, 2018
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We explored the relationship between chemical composition and the temperature sensitivity of moss decomposition using 959-day lab incubations. Mass loss was low despite the predominance of carbohydrates, indicating the persistence of labile C. Scanning electron microscopy revealed little change in the moss cell-wall structure. These results suggest that the moss cell-wall matrix protects labile C from decomposition, contributing to the globally important stocks of moss-derived C.
Cited articles
Agostini, S., Wada, S., Kon, K., Omori, A., Kohtsuka, H., Fujimura, H.,
Tsuchiya, Y., Sato, T., Shinagawa, H., Yamada, Y., and Inaba, K.:
Geochemistry of two shallow CO2 seeps in Shikine Island (Japan) and
their potential for ocean acidification research, Regional Studies in Marine
Science, 2, 45–53, 2015.
Agostini, S., Harvey, B. P., Wada, S., Kon, K., Milazzo, M., Inaba, K., and
Hall-Spencer, J. M.: Ocean acidification drives community shifts towards
simplified non-calcified habitats in a subtropical-temperate transition zone,
Sci. Rep., 8, 11354, https://doi.org/10.1038/s41598-018-29251-7, 2018.
Badger, M. P. S., Chalk, T. B., Foster, G. L., Bown, P. R., Gibbs, S. J.,
Sexton, P. F., Schmidt, D. N., Pälike, H., Mackensen, A., and Pancost,
R. D.: Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low
to moderate CO2 levels, Clim. Past, 15, 539–554,
https://doi.org/10.5194/cp-15-539-2019, 2019.
Benthien, A., Zondervan, I., Engel, A., Hefter, J., Terbruggen, A., and
Riebesell, U.: Carbon isotopic fractionation during a mesocosm bloom
experiment dominated by Emiliania huxleyi: Effects of CO2 concentration
and primary production, Geochim. Cosmochim. Ac., 71, 1528–1541,
https://doi.org/10.1016/j.gca.2006.12.015, 2007.
Bice, K. L., Birgel, D., Meyers, P. A., Dahl, K. A., Hinrichs, K. U., and
Norris, R. D.: A multiple proxy and model study of Cretaceous upper ocean
temperatures and atmospheric CO2 concentrations, Paleoceanography, 21, PA2002, https://doi.org/10.1029/2005PA001203,
2006.
Bidigare, R. R., Fluegge, A., Freeman, K. H., Hanson, K. L., Hayes, J. M.,
Hollander, D., Jasper, J. P., King, L. L., Laws, E. A., Milder, J., Millero,
F. J., Pancost, R., Popp, B. N., Steinberg, P. A., and Wakeham, S. G.:
Consistent fractionation of C-13 in nature and in the laboratory:
Growth-rate effects in some haptophyte algae, Global Biogeochem. Cy., 11,
279–292, 1997.
Boatta, F., D'Alessandro, W., Gagliano, A. L., Liotta, M., Milazzo, M.,
Rodolfo-Metalpa, R., Hall-Spencer, J. M., and Parello, F.: Geochemical
survey of Levante Bay, Vulcano Island (Italy), a natural laboratory for the
study of ocean acidification, Mar. Pollut. Bull., 73, 485–494, 2013.
Bowen, G. J. and Beerling, D. J.: An integrated model for soil organic
carbon and CO2: Implications for paleosol carbonate pCO2
paleobarometry, Global Biogeochem. Cy., 18, GB1026, https://doi.org/10.1029/2003gb002117,
2004.
Breecker, D. O., Sharp, Z. D., and McFadden, L. D.: Atmospheric CO2
concentrations during ancient greenhouse climates were similar to those
predicted for AD 2100, P. Natl. Acad. Sci. USA, 107, 576–580, 2010.
Brinkman, T. J. and Smith, A. M.: Effect of climate change on crustose
coralline algae at a temperate vent site, White Island, New Zealand, Mar.
Freshwater Res., 66, 360–370, 2015.
Castañeda, I. S., Werne, J. P., and Johnson, T. C.: Influence of climate
change on algal community structure and primary productivity of Lake Malawi
(East Africa) from the Last Glacial Maximum to present, Limnol.
Oceanogr., 54, 2431–2447, 2009.
Cotton, J. M. and Sheldon, N. D.: New constraints on using paleosols to
reconstruct atmospheric pCO2, Geol. Soc. Am. Bull., 124, 1411–1423, 2012.
DaMatta F. M., Godoy A. G., Menezes-Silva P. E., Martins S. C., Sanglard L. M., Morais L. E., Torre-Neto, A., and Ghini, R.: Sustained enhancement of photosynthesis in coffee trees grown under free-air CO2 enrichment conditions: disentangling the contributions of stomatal, mesophyll, and biochemical limitations, J. Exp. Bot., 67, 341352, https://doi.org/10.1093/jxb/erv463, 2016.
Dando, P. R., Stuben, D., and Varnavas, S. P.: Hydrothermalism in the
Mediterranean Sea, Prog. Oceanogr., 44, 333–367, 1999.
de Leeuw, J. W., Meer, F. W. V. D., Rijpstra, W. I. C., and Schenck, P. A.:
On the occurrence and structural identification of long chain unsaturated
ketones and hydrocarbons in sediments, in: Advances in Organic Geochemistry,
edited by: Douglas, A. E. and Maxwell, J. R., Pergamon, Oxford, 211–217,
1980.
Ellsworth, D. S., Thomas, R. , Crous, K. Y., Palmroth, S. , Ward, E. , Maier, C. , DeLucia, E. and Oren, R.: Elevated CO2 affects photosynthetic responses in canopy pine and subcanopy deciduous trees over 10 years: a synthesis from Duke FACE, Glob. Change Biol., 18, 223–242, https://doi.org/10.1111/j.1365-2486.2011.02505.x, 2012.
Fabricius, K. E., Langdon, C., Uthicke, S., Humphrey, C., Noonan, S.,
De'ath, G., Okazaki, R., Muehllehner, N., Glas, M. S., and Lough, J. M.:
Losers and winners in coral reefs acclimatized to elevated carbon dioxide
concentrations, Nat. Clim. Change, 1, 165–169, 2011.
Farquhar, G. D., Oleary, M. H., and Berry, J. A.: On the Relationship
between Carbon Isotope Discrimination and the Inter-Cellular Carbon-Dioxide
Concentration in Leaves, Aust. J. Plant Physiol., 9, 121–137,
1982.
Farquhar, G. D., Ehleringer, J. R., and Hubick, K. T.: Carbon Isotope
Discrimination and Photosynthesis, Ann. Rev. Plant Phys., 40, 503–537, 1989.
Forster, P., Ramaswamy, V., Artaxo, P., Berntsen, T., Betts, R., Fahey, D.
W., Haywood, J., Lean, J., Lowe, D. C., Myhre, G., Nganga, J., Prinn, R.,
Raga, G., Schulz, M., and Van Dorland, R.: Contribution of Working Group I
to the Fourth Assessment Report of the Intergovernmental Panel on Climate
Change, in: Climate Change 2007: The Physical Science Basis, edited by:
Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B.,
Tignor, M., and Miller, H. L., Cambridge University Press, Cambridge, UK, 131–217, 2007.
Foster, G. L., Royer, D. L., and Lunt, D. J.: Future climate forcing
potentially without precedent in the last 420 million years, Nat.
Commun., 8, 14845, https://doi.org/10.1038/ncomms14845, 2017.
Francois, R., Altabet, M. A., Goericke, R., Mccorkle, D. C., Brunet, C., and
Poisson, A.: Changes in the Delta-C-13 of Surface-Water Particulate
Organic-Matter across the Subtropical Convergence in the Sw Indian-Ocean,
Global Biogeochem. Cy., 7, 627–644, 1993.
Freeman, K. H. and Hayes, J. M.: Fractionation of Carbon Isotopes by
Phytoplankton and Estimates of Ancient CO2 Levels, Global Biogeochem.
Cy., 6, 185–198, 1992.
Goericke, R. and Fry, B.: Variations of Marine Plankton Delta-C-13 with
Latitude, Temperature, and Dissolved CO2 in the World Ocean, Global
Biogeochem. Cy., 8, 85–90, 1994.
Hall-Spencer, J. M., Rodolfo-Metalpa, R., Martin, S., Ransome, E., Fine, M.,
Turner, S. M., Rowley, S. J., Tedesco, D., and Buia, M. C.: Volcanic carbon
dioxide vents show ecosystem effects of ocean acidification, Nature, 454,
96–99, 2008.
Harvey, B. P., Agostini, S., Wada, S., Inaba, K., and Hall-Spencer, J. M.:
Dissolution: The Achilles' Heel of the Triton Shell in an Acidifying Ocean,
Front. Mar. Sci., 5, 371, https://doi.org/10.3389/fmars.2018.00371, 2018.
Hayes, J. M.: Factors Controlling C-13 Contents of Sedimentary
Organic-Compounds – Principles and Evidence, Mar. Geol., 113, 111–125,
1993.
Hayes, J. M., Freeman, K. H., Popp, B. N., and Hoham, C. H.:
Compound-Specific Isotopic Analyses – a Novel Tool for Reconstruction of
Ancient Biogeochemical Processes, Org. Geochem., 16, 1115–1128, 1990.
Hayes, J. M., Strauss, H., and Kaufman, A. J.: The abundance of C-13 in
marine organic matter and isotopic fractionation in the global
biogeochemical cycle of carbon during the past 800 Ma, Chem. Geol.,
161, 103–125, 1999.
IPCC: The Physical Science Basis, Contribution of Working Group I to the
Fifth Assessment Report of the Intergovernmental Panel on Climate Change,
Cambridge, ARS, 1535 pp., 2013.
Jasper, J. P. and Hayes, J. M.: A Carbon Isotope Record of CO2 Levels
during the Late Quaternary, Nature, 347, 462–464, 1990.
Jasper, J. P., Hayes, J. M., Mix, A. C., and Prahl, F. G.: Photosynthetic
Fractionation of C-13 and Concentrations of Dissolved CO2 in the Central
Equatorial Pacific during the Last 255,000 Years, Paleoceanography, 9,
781–798, 1994.
Klok, J., Cox, H. C., Deleeuw, J. W., and Schenck, P. A.: Loliolides and
Dihydroactinidiolide in a Recent Marine Sediment Probably Indicate a Major
Transformation Pathway of Carotenoids, Tetrahedron Lett., 25, 5577–5580,
1984.
Laws, E. A., Popp, B. N., Bidigare, R. R., Kennicutt, M. C., and Macko, S.
A.: Dependence of Phytoplankton Carbon Isotopic Composition on Growth-Rate
and [CO2](Aq) – Theoretical Considerations and Experimental Results,
Geochim. Cosmochim. Ac., 59, 1131–1138, 1995.
Lewis, E. and Wallace, D.: Program developed for CO2 system
calculations, Oak Ridge National Laboraotry, Oak Ridge, Tennessee, 1998.
Liaaen-Jensen, S.: Marine carotenoids, in: Marine natural products, edited
by: Scheuer, P. J., Academic Press, 747–759, 1978.
Lüthi, D., Le Floch, M., Bereiter, B., Blunier, T., Barnola, J. M.,
Siegenthaler, U., Raynaud, D., Jouzel, J., Fischer, H., Kawamura, K., and
Stocker, T. F.: High-resolution carbon dioxide concentration record
650,000–800,000 years before present, Nature, 453, 379–382, 2008.
Madigan, M. T., Takigiku, R., Lee, R. G., Gest, H., and Hayes, J. M.: Carbon
Isotope Fractionation by Thermophilic Phototrophic Sulfur Bacteria –
Evidence for Autotrophic Growth in Natural-Populations, Appl.
Environ. Microbiol., 55, 639–644, 1989.
Mook, W. G. B., Bommerson, J. C., and Staverman, W. H.: Carbon isotope fractionation between
dissolved bicarbonate and gaseous carbon dioxide, Earth Planet.
Sci. Lett., 22, 169–176, https://doi.org/10.1016/0012-821X(74)90078-8, 1974.
Mouritsen, O. G. and Zuckermann, M. J.: What's so special about
cholesterol?, Lipids, 39, 1101–1113, 2004.
Nes, W. D., Janssen, G. G., Crumley, F. G., Kalinowska, M., and Akihisa, T.:
The Structural Requirements of Sterols for Membrane-Function in
Saccharomyces-Cerevisiae, Arch. Biochem. Biophys., 300,
724–733, 1993.
Pagani, M.: The alkenone-CO2 proxy and ancient atmospheric carbon
dioxide, Philos. T. R. S. S-A, 360, 609–632, 2002.
Popp, B. N., Takigiku, R., Hayes, J. M., Louda, J. W., and Baker, E. W.: The
Post-Paleozoic Chronology and Mechanism of C-13 Depletion in Primary Marine
Organic-Matter, Am. J. Sci., 289, 436–454, 1989.
Popp, B. N., Laws, E. A., Bidigare, R. R., Dore, J. E., Hanson, K. L., and
Wakeham, S. G.: Effect of phytoplankton cell geometry on carbon isotopic
fractionation, Geochim. Cosmochim. Ac., 62, 69–77, 1998.
Quast, A., Hoefs, J., and Paul, J.: Pedogenic carbonates as a proxy for
palaeo-CO2 in the Palaeozoic atmosphere, Palaeogeogr. Palaeocl., 242, 110–125,
https://doi.org/10.1016/j.palaeo.2006.05.017, 2006.
Rau, G. H., Riebesell, U., and WolfGladrow, D.: A model of photosynthetic
C-13 fractionation by marine phytoplankton based on diffusive molecular CO2
uptake, Mar. Ecol. Prog. Ser., 133, 275–285, 1996.
Repeta, D. J.: Carotenoid Diagenesis in Recent Marine-Sediments, 2.
Degradation of Fucoxanthin to Loliolide, Geochim. Cosmochim. Ac., 53, 699–707,
1989.
Schouten, S., Breteler, W. C. M. K., Blokker, P., Schogt, N., Rijpstra, W.
I. C., Grice, K., Baas, M., and Sinninghe Damsté, J. S.: Biosynthetic
effects on the stable carbon isotopic compositions of algal lipids:
Implications for deciphering the carbon isotopic biomarker record, Geochim.
Cosmochim. Ac., 62, 1397–1406, 1998.
Sinninghe Damsté, J. S., Kuypers, M. M. M., Pancost, R. D., and
Schouten, S.: The carbon isotopic response of algae, (cyano)bacteria,
archaea and higher plants to the late Cenomanian perturbation of the global
carbon cycle: Insights from biomarkers in black shales from the Cape Verde
Basin (DSDP Site 367), Org. Geochem., 39, 1703–1718, 2008.
Stoll, H. M., Guitian, J., Hernandez-Almeida, I., Mejia, L. M., Phelps, S.,
Polissar, P., Rosenthal, Y., Zhang, H. R., and Ziveri, P.: Upregulation of
phytoplankton carbon concentrating mechanisms during low CO2 glacial
periods and implications for the phytoplankton pCO2 proxy, Quaternary Sci.
Rev., 208, 1–20, https://doi.org/10.1016/j.quascirev.2019.01.012, 2019.
van Bentum, E. C., Reichart, G. J., and Sinninghe Damsté, J. S.: Organic
matter provenance, palaeoproductivity and bottom water anoxia during the
Cenomanian/Turonian oceanic anoxic event in the Newfoundland Basin (northern
proto North Atlantic Ocean), Org. Geochem., 50, 11–18, 2012.
Volkman, J. K., Eglinton, G., Corner, E. D. S., and Forsberg, T. E. V.:
Long-Chain Alkenes and Alkenones in the Marine Coccolithophorid
Emiliania-Huxleyi, Phytochemistry, 19, 2619–2622, 1980.
Ward, E., Oren, R., Bell, D.M., Clark, J.S., McCarthy, H.R., Kim, H.-S., and Domec, J.-C.: The effects of elevated CO2 and nitrogen fertilization on stomatal conductance estimated from 11 years of scaled sap flux measurements at Duke FACE, Tree Physiol., 33, 2, 135151, https://doi.org/10.1093/treephys/tps118, 2013.
Wei, J. H., Yin, X. C., and Welander, P. V.: Sterol Synthesis in Diverse
Bacteria, Front. Microbiol., 7, 990, https://doi.org/10.3389/fmicb.2016.00990, 2016.
Weiss, R. F.: Carbon dioxide in water and seawater: The solubility of a
non-deal gas, Mar. Chem., 2, 203–215, https://doi.org/10.1016/0304-4203(74)90015-2,
1974.
Witkowski, C. R., Weijers, J. W. H., Blais, B., Schouten, S., and Sinninghe
Damsté, J. S.: Molecular fossils from phytoplankton reveal secular
pCO2 trend over the Phanerozoic, Sci. Adv., 4, eaat4556,
https://doi.org/10.1126/sciadv.aat4556, 2018.
Xu, Z., Jiang, Y., Jia, B., and Zhou, G.: Elevated-CO2 response of stomata and its dependence on environmental factors, Front. Plant Sci., 7, 657, https://doi.org/10.3389/fpls.2016.00657, 2016.
Zhang, Y. G., Pagani, M., Liu, Z. H., Bohaty, S. M., and DeConto, R.: A 40-million-year history of atmospheric CO2, Philos. T. R. Soc. A, 7, 371, https://doi.org/10.1098/rsta.2013.0096, 2013.
Short summary
Carbon dioxide concentrations (pCO2) in the atmosphere play an integral role in Earth system dynamics, especially climate. Past climates help us understand future ones, but reconstructing pCO2 over the geologic record remains a challenge. This research demonstrates new approaches for exploring past pCO2 via the carbon isotope fractionation in general algal lipids, which we test over a high CO2 gradient from a naturally occurring CO2 seep.
Carbon dioxide concentrations (pCO2) in the atmosphere play an integral role in Earth system...
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