Articles | Volume 18, issue 12
https://doi.org/10.5194/bg-18-3579-2021
© Author(s) 2021. 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-18-3579-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Jun 2021
Research article |
| 17 Jun 2021
| 17 Jun 2021
Revised fractional abundances and warm-season temperatures substantially improve brGDGT calibrations in lake sediments
Jonathan H. Raberg
CORRESPONDING AUTHOR
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
David J. Harning
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
Sarah E. Crump
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
currently at: Ecology and Evolutionary Biology Department, University of California Santa Cruz, Santa Cruz, CA 95064, USA
Greg de Wet
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
currently at: Department of Geosciences, Smith College, Northampton, MA 01063, USA
Aria Blumm
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
currently at: Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
Sebastian Kopf
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Áslaug Geirsdóttir
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
Gifford H. Miller
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Julio Sepúlveda
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
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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.
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.
Caitlyn R. Witkowski, Sylvain Agostini, Ben P. Harvey, Marcel T. J. van der Meer, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 16, 4451–4461, https://doi.org/10.5194/bg-16-4451-2019, https://doi.org/10.5194/bg-16-4451-2019, 2019
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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.
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.
Yinghui Wang, Robert G. M. Spencer, David C. Podgorski, Anne M. Kellerman, Harunur Rashid, Phoebe Zito, Wenjie Xiao, Dandan Wei, Yuanhe Yang, and Yunping Xu
Biogeosciences, 15, 6637–6648, https://doi.org/10.5194/bg-15-6637-2018, https://doi.org/10.5194/bg-15-6637-2018, 2018
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With global warming, thawing of permafrost releases dissolved organic matter (DOM) into streams. By analyzing DOM along an alpine stream on the Qinghai–Tibet Plateau, we found DOM was mainly from the active layer, but with deepening of the active layer, the contribution of the deep permafrost layer increased, causing a change in the chemical composition of DOM. From the head- to downstream, DOM is undergoing rapid degradation, but some components are persistent and can be transported downstream.
Sergio Balzano, Julie Lattaud, Laura Villanueva, Sebastiaan W. Rampen, Corina P. D. Brussaard, Judith van Bleijswijk, Nicole Bale, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 15, 5951–5968, https://doi.org/10.5194/bg-15-5951-2018, https://doi.org/10.5194/bg-15-5951-2018, 2018
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We tried to identify the microbes which biosynthesize a class of lipids widespread in seawater, the long chain alkyl diols (LCDs). We could not find any microorganism likely involved in the production of LCDs. The amounts of LCDs found are too high to be produced by living organisms and are likely to be part of the refractory organic matter persisting for long periods in the water column.
Julie Lattaud, Frédérique Kirkels, Francien Peterse, Chantal V. Freymond, Timothy I. Eglinton, Jens Hefter, Gesine Mollenhauer, Sergio Balzano, Laura Villanueva, Marcel T. J. van der Meer, Ellen C. Hopmans, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 15, 4147–4161, https://doi.org/10.5194/bg-15-4147-2018, https://doi.org/10.5194/bg-15-4147-2018, 2018
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Long-chain diols (LCDs) are biomarkers that occur widespread in marine environments and also in lakes and rivers. In this study, we looked at the distribution of LCDs in three river systems (Godavari, Danube, and Rhine) in relation to season, precipitation, and temperature. We found out that the LCDs are likely being produced in calm areas of the river systems and that marine LCDs have a different distribution than riverine LCDs.
Marcel Bliedtner, Imke K. Schäfer, Roland Zech, and Hans von Suchodoletz
Biogeosciences, 15, 3927–3936, https://doi.org/10.5194/bg-15-3927-2018, https://doi.org/10.5194/bg-15-3927-2018, 2018
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In this study, we systematically analyze leaf wax derived n-alkane patterns in eastern Georgia to test their potential for paleoenvironmental reconstructions in the semi-humid to semi-arid central southern Caucasus region. We investigated the influence of vegetation types on the leaf wax signal in modern plants and topsoil material. Our results show distinct and systematic differences in the n-alkane patterns between vegetation types and prove their potential for vegetation reconstructions.
Mathieu Rembauville, Stéphane Blain, Clara Manno, Geraint Tarling, Anu Thompson, George Wolff, and Ian Salter
Biogeosciences, 15, 3071–3084, https://doi.org/10.5194/bg-15-3071-2018, https://doi.org/10.5194/bg-15-3071-2018, 2018
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Sinking phytoplankton from the surface ocean provide the principal energy source to deep-ocean ecosystems. Our aim was to understand how different phytoplankton communities impact the chemical nature of this sinking material. We show certain types of phytoplankton can preferentially export energy-rich storage compounds to the seafloor. Any climate-driven effects on phytoplankton community structure could thus impact remote deep-ocean ecosystems thousands of kilometres beneath the surface.
Xiaocong Wei, Xiangwen Deng, Wenhua Xiang, Pifeng Lei, Shuai Ouyang, Hongfang Wen, and Liang Chen
Biogeosciences, 15, 2991–3002, https://doi.org/10.5194/bg-15-2991-2018, https://doi.org/10.5194/bg-15-2991-2018, 2018
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Karst is a kind of typical calcium-rich environment, which is widely distributed. We measured the Ca2+ content of 41 plant species, as well as soil total Ca2+ and exchange Ca2+. We found out that different plants have different ways to high Ca2+ adaptation. According to the different high Ca2+ adaptation of the 17 dominant species, we divided them into 3 categories: Ca-indifferent plants, high-Ca plants and low-Ca plants. Our results can provide a theoretical basis for vegetation restoration.
Janina G. Stapel, Georg Schwamborn, Lutz Schirrmeister, Brian Horsfield, and Kai Mangelsdorf
Biogeosciences, 15, 1969–1985, https://doi.org/10.5194/bg-15-1969-2018, https://doi.org/10.5194/bg-15-1969-2018, 2018
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Climate warming in the Arctic results in thawing of permafrost deposits. This promotes the accessibility of freeze-locked old organic matter (OM) accumulated during the past. Characterizing OM of different depositional ages, we were able to show that OM from last glacial Yedoma deposits possess the highest potential to provide organic substrates such as acetate for microbial greenhouse gas production and therefore to accelerate the carbon–climate feedback cycle during ongoing global warming.
Changchun Huang, Quanliang Jiang, Ling Yao, Hao Yang, Chen Lin, Tao Huang, A-Xing Zhu, and Yimin Zhang
Biogeosciences, 15, 1827–1841, https://doi.org/10.5194/bg-15-1827-2018, https://doi.org/10.5194/bg-15-1827-2018, 2018
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The latitudinal dependency of POC / PON in ocean and inland water is significant, regulated by trophic state and climate, etc. factors. POC / PON significantly increased from coastal water (6.89 ± 2.38) to open ocean (7.59 ± 4.22) with the increasing rate of 0.0024 / km. The re-examination of the global relationship between, and variations in, POC and PON could be important for the global and regional coupling between the carbon and nitrogen cycles in the ocean and freshwater.
Nicole J. Bale, Tracy A. Villareal, Ellen C. Hopmans, Corina P. D. Brussaard, Marc Besseling, Denise Dorhout, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 15, 1229–1241, https://doi.org/10.5194/bg-15-1229-2018, https://doi.org/10.5194/bg-15-1229-2018, 2018
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Associations between diatoms and N-fixing cyanobacteria (diatom–diazotroph associations, DDAs) play an important role in the N cycle of the tropical North Atlantic. Heterocysts are the site of N fixation and contain unique glycolipids. We measured these glycolipids in the water column and surface sediment from the tropical North Atlantic. We found a significant correlation between the concentration of glycolipid and of DDAs, strengthening their application as biomarkers.
Cited articles
Baxter, A. J., Hopmans, E. C., Russell, J. M., and Sinninghe Damsté, J. S.:
Bacterial GMGTs in East African lake sediments: Their potential as palaeotemperature indicators,
Geochim. Cosmochim. Ac.,
259, 155–169, https://doi.org/10.1016/j.gca.2019.05.039, 2019.
Beales, N.:
Adaptation of Microorganisms to Cold Temperatures, Weak Acid Preservatives, Low pH, and Osmotic Stress: A Review,
Compr. Rev. Food Sci. F.,
3, 1–20, https://doi.org/10.1111/j.1541-4337.2004.tb00057.x, 2004.
Buckles, L. K., Weijers, J. W. H., Verschuren, D., and Sinninghe Damsté, J. S.:
Sources of core and intact branched tetraether membrane lipids in the lacustrine environment: Anatomy of Lake Challa and its catchment, equatorial East Africa,
Geochim. Cosmochim. Ac.,
140, 106–126, https://doi.org/10.1016/j.gca.2014.04.042, 2014.
Cao, J., Rao, Z., Jia, G., Xu, Q., and Chen, F.:
A 15 ka pH record from an alpine lake in north China derived from the cyclization ratio index of aquatic brGDGTs and its paleoclimatic significance,
Org. Geochem.,
109, 31–46, https://doi.org/10.1016/j.orggeochem.2017.02.005, 2017.
Cao, J., Rao, Z., Shi, F., and Jia, G.: Ice formation on lake surfaces in winter causes warm-season bias of lacustrine brGDGT temperature estimates, Biogeosciences, 17, 2521–2536, https://doi.org/10.5194/bg-17-2521-2020, 2020.
Colcord, D. E., Pearson, A., and Brassell, S. C.:
Carbon isotopic composition of intact branched GDGT core lipids in Greenland lake sediments and soils,
Org. Geochem.,
110, 25–32, https://doi.org/10.1016/J.ORGGEOCHEM.2017.04.008, 2017.
Crump, S. E., Miller, G. H., Power, M., Sepúlveda, J., Dildar, N., Coghlan, M., and Bunce, M.:
Arctic shrub colonization lagged peak postglacial warmth: Molecular evidence in lake sediment from Arctic Canada,
Glob. Change Biol.,
5, 1–13, https://doi.org/10.1111/gcb.14836, 2019.
Dang, X., Ding, W., Yang, H., Pancost, R. D., Naafs, B. D. A., Xue, J., Lin, X., Lu, J., and Xie, S.:
Different temperature dependence of the bacterial brGDGT isomers in 35 Chinese lake sediments compared to that in soils,
Org. Geochem.,
119, 72–79, https://doi.org/10.1016/j.orggeochem.2018.02.008, 2018.
Dang, X. Y., Xue, J. T., Yang, H., and Xie, S. C.:
Environmental impacts on the distribution of microbial tetraether lipids in Chinese lakes with contrasting pH: Implications for lacustrine paleoenvironmental reconstructions,
Sci. China Earth Sci.,
59, 939–950, https://doi.org/10.1007/s11430-015-5234-z, 2016.
De Jonge, C., Hopmans, E. C., Stadnitskaia, A., Rijpstra, W. I. C., Hofland, R., Tegelaar, E., and Sinninghe Damsté, J. S.:
Identification of novel penta- and hexamethylated branched glycerol dialkyl glycerol tetraethers in peat using HPLC-MS2, GC-MS and GC-SMB-MS,
Org. Geochem.,
54, 78–82, https://doi.org/10.1016/j.orggeochem.2012.10.004, 2013.
De Jonge, C., Stadnitskaia, A., Hopmans, E. C., Cherkashov, G., Fedotov, A., and Sinninghe Damsté, J. S.:
In situ produced branched glycerol dialkyl glycerol tetraethers in suspended particulate matter from the Yenisei River, Eastern Siberia,
Geochim. Cosmochim. Ac.,
125, 476–491, https://doi.org/10.1016/j.gca.2013.10.031, 2014a.
De Jonge, C., Hopmans, E. C., Zell, C. I., Kim, J. H., Schouten, S., and Sinninghe Damsté, J. S.:
Occurrence and abundance of 6-methyl branched glycerol dialkyl glycerol tetraethers in soils: Implications for palaeoclimate reconstruction,
Geochim. Cosmochim. Ac.,
141, 97–112, https://doi.org/10.1016/j.gca.2014.06.013, 2014b.
De Jonge, C., Radujković, D., Sigurdsson, B. D., Weedon, J. T., Janssens, I., and Peterse, F.:
Lipid biomarker temperature proxy responds to abrupt shift in the bacterial community composition in geothermally heated soils,
Org. Geochem.,
137, 103897, https://doi.org/10.1016/j.orggeochem.2019.07.006, 2019.
de Wet, G. A., Castañeda, I. S., DeConto, R. M., and Brigham-Grette, J.:
A high-resolution mid-Pleistocene temperature record from Arctic Lake El'gygytgyn: A 50 kyr super interglacial from MIS 33 to MIS 31?,
Earth Planet. Sc. Lett.,
436, 56–63, https://doi.org/10.1016/j.epsl.2015.12.021, 2016.
Dearing Crampton-Flood, E., Peterse, F., Munsterman, D., and Sinninghe Damsté, J. S.:
Using tetraether lipids archived in North Sea Basin sediments to extract North Western European Pliocene continental air temperatures,
Earth Planet. Sc. Lett.,
490, 193–205, https://doi.org/10.1016/j.epsl.2018.03.030, 2018.
Dillon, J. T., Lash, S., Zhao, J., Smith, K. P., van Dommelen, P., Scherer, A. K., and Huang, Y.:
Bacterial tetraether lipids in ancient bones record past climate conditions at the time of disposal,
J. Archaeol. Sci.,
96, 45–56, https://doi.org/10.1016/j.jas.2018.05.009, 2018.
Ding, S., Xu, Y., Wang, Y., He, Y., Hou, J., Chen, L., and He, J.-S.: Distribution of branched glycerol dialkyl glycerol tetraethers in surface soils of the Qinghai–Tibetan Plateau: implications of brGDGTs-based proxies in cold and dry regions, Biogeosciences, 12, 3141–3151, https://doi.org/10.5194/bg-12-3141-2015, 2015.
Ding, S., Schwab, V. F., Ueberschaar, N., Roth, V.-N., Lange, M., Xu, Y., Gleixner, G., and Pohnert, G.:
Identification of novel 7-methyl and cyclopentanyl branched glycerol dialkyl glycerol tetraethers in lake sediments,
Org. Geochem.,
102, 52–58, https://doi.org/10.1016/J.ORGGEOCHEM.2016.09.009, 2016.
Ding, S., Kohlhepp, B., Trumbore, S., Küsel, K., Totsche, K. U., Pohnert, G., Gleixner, G., and Schwab, V. F.:
In situ production of core and intact bacterial and archaeal tetraether lipids in groundwater,
Org. Geochem.,
126, 1–12, https://doi.org/10.1016/j.orggeochem.2018.10.005, 2018.
Fastovich, D., Russell, J. M., Jackson, S. T., and Williams, J. W.:
Deglacial temperature controls on no-analog community establishment in the Great Lakes Region,
Quaternary Sci. Rev.,
234, 106245, https://doi.org/10.1016/j.quascirev.2020.106245, 2020.
Fick, S. E. and Hijmans, R. J.:
WorldClim 2: new 1-km spatial resolution climate surfaces for global land areas,
Int. J. Climatol.,
37, 4302–4315, https://doi.org/10.1002/joc.5086, 2017.
Foster, L. C., Pearson, E. J., Juggins, S., Hodgson, D. A., Saunders, K. M., Verleyen, E., and Roberts, S. J.:
Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes,
Earth Planet. Sc. Lett.,
433, 370–379, https://doi.org/10.1016/j.epsl.2015.11.018, 2016.
Guo, J., Glendell, M., Meersmans, J., Kirkels, F., Middelburg, J. J., and Peterse, F.: Assessing branched tetraether lipids as tracers of soil organic carbon transport through the Carminowe Creek catchment (southwest England), Biogeosciences, 17, 3183–3201, https://doi.org/10.5194/bg-17-3183-2020, 2020.
Hanna, A. J. M., Shanahan, T. M., and Allison, M. A.:
Distribution of branched GDGTs in surface sediments from the Colville River, Alaska: Implications for the MBT'/CBT paleothermometer in Arctic marine sediments,
J. Geophys. Res.-Biogeo.,
121, 1762–1780, https://doi.org/10.1002/2015JG003266, 2016.
Harning, D. J., Andrews, J. T., Belt, S. T., Cabedo-Sanz, P., Geirsdóttir, Á., Dildar, N., Miller, G. H., and Sepúlveda, J.:
Sea Ice Control on Winter Subsurface Temperatures of the North Iceland Shelf During the Little Ice Age: A TEX86 Calibration Case Study,
Paleoclimatology and Paleometeorology,
34, 1006–1021, https://doi.org/10.1029/2018PA003523, 2019.
Harning, D. J., Curtin, L., Geirsdóttir, Á., D'Andrea, W. J., Miller, G. H., and Sepúlveda, J.:
Lipid Biomarkers Quantify Holocene Summer Temperature and Ice Cap Sensitivity in Icelandic Lakes,
Geophys. Res. Lett.,
47, 1–11, https://doi.org/10.1029/2019GL085728, 2020.
Hopmans, E. C., Weijers, J. W. ., Schefuß, E., Herfort, L., Sinninghe Damsté, J. S., and Schouten, S.:
A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids,
Earth Planet. Sc. Lett.,
224, 107–116, https://doi.org/10.1016/j.epsl.2004.05.012, 2004.
Hopmans, E. C., Schouten, S., and Sinninghe, J. S.:
The effect of improved chromatography on GDGT-based palaeoproxies,
Org. Geochem.,
93, 1–6, https://doi.org/10.1016/j.orggeochem.2015.12.006, 2016.
Hu, J., Zhou, H., Peng, P., and Spiro, B.:
Seasonal variability in concentrations and fluxes of glycerol dialkyl glycerol tetraethers in Huguangyan Maar Lake, SE China: Implications for the applicability of the MBT-CBT paleotemperature proxy in lacustrine settings,
Chem. Geol.,
420, 200–212, https://doi.org/10.1016/j.chemgeo.2015.11.008, 2016.
Huguet, C., Hopmans, E. C., Febo-Ayala, W., Thompson, D. H., Sinninghe Damsté, J. S., and Schouten, S.:
An improved method to determine the absolute abundance of glycerol dibiphytanyl glycerol tetraether lipids,
Org. Geochem.,
37, 1036–1041, https://doi.org/10.1016/j.orggeochem.2006.05.008, 2006.
Hutchinson, G. E.:
On the Relation between the Oxygen Deficit and the productivity and Typology of Lakes,
Internationale Revue der gesamten Hydrobiologie und Hydrographie,
36, 336–355, https://doi.org/10.1002/iroh.19380360205, 1938.
Landrum, L. and Holland, M. M.:
Extremes become routine in an emerging new Arctic,
Nat. Clim. Change,
10, 1108–1115, https://doi.org/10.1038/s41558-020-0892-z, 2020.
Li, F., Zhang, C. L., Wang, S., Chen, Y., Sun, C., Dong, H., Li, W., Klotz, M. G., and Hedlund, B. P.:
Production of branched tetraether lipids in Tibetan hot springs: A possible linkage to nitrite reduction by thermotolerant or thermophilic bacteria?,
Chem. Geol.,
386, 209–217, https://doi.org/10.1016/j.chemgeo.2014.08.015, 2014.
Loomis, S. E., Russell, J. M., Ladd, B., Street-Perrott, F. A., and Sinninghe Damsté, J. S.:
Calibration and application of the branched GDGT temperature proxy on East African lake sediments,
Earth Planet. Sc. Lett.,
357–358, 277–288, https://doi.org/10.1016/j.epsl.2012.09.031, 2012.
Loomis, S. E., Russell, J. M., Eggermont, H., Verschuren, D., and Sinninghe Damsté, J. S.:
Effects of temperature, pH and nutrient concentration on branched GDGT distributions in East African lakes: Implications for paleoenvironmental reconstruction,
Org. Geochem.,
66, 25–37, https://doi.org/10.1016/j.orggeochem.2013.10.012, 2014a.
Loomis, S. E., Russell, J. M., Heureux, A. M., D'Andrea, W. J., and Sinninghe Damsté, J. S.:
Seasonal variability of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in a temperate lake system,
Geochim. Cosmochim. Ac.,
144, 173–187, https://doi.org/10.1016/j.gca.2014.08.027, 2014b.
Lu, H., Liu, W., Yang, H., Wang, H., Liu, Z., Leng, Q., Sun, Y., Zhou, W., and An, Z.:
800-kyr land temperature variations modulated by vegetation changes on Chinese Loess Plateau,
Nat. Commun.,
10, 1958, https://doi.org/10.1038/s41467-019-09978-1, 2019.
Lumley, T.:
leaps: Regression Subset Selection,
CRAN repository, 2020.
Martínez-Sosa, P., Tierney, J. E., Stefanescu, I. C., Dearing Crampton-Flood, E., Shuman, B. N., and Routson, C.:
A global Bayesian temperature calibration for lacustrine brGDGTs,
Geochim. Cosmochim. Ac., 305, 87–105, https://doi.org/10.1016/j.gca.2021.04.038, 2021.
Miller, D. R., Habicht, M. H., Keisling, B. A., Castañeda, I. S., and Bradley, R. S.: A 900-year New England temperature reconstruction from in situ seasonally produced branched glycerol dialkyl glycerol tetraethers (brGDGTs), Clim. Past, 14, 1653–1667, https://doi.org/10.5194/cp-14-1653-2018, 2018.
Miller, G. H., Alley, R. B., Brigham-Grette, J., Fitzpatrick, J. J., Polyak, L., Serreze, M. C., and White, J. W. C.:
Arctic amplification: Can the past constrain the future?,
Quaternary Sci. Rev.,
29, 1779–1790, https://doi.org/10.1016/j.quascirev.2010.02.008, 2010.
Naafs, B. D. A., Gallego-Sala, A. V., Inglis, G. N., and Pancost, R. D.:
Refining the global branched glycerol dialkyl glycerol tetraether (brGDGT) soil temperature calibration,
Org. Geochem.,
106, 48–56, https://doi.org/10.1016/j.orggeochem.2017.01.009, 2017.
Naeher, S., Peterse, F., Smittenberg, R. H., Niemann, H., Zigah, P. K., and Schubert, C. J.:
Sources of glycerol dialkyl glycerol tetraethers (GDGTs) in catchment soils, water column and sediments of Lake Rotsee (Switzerland) – Implications for the application of GDGT-based proxies for lakes,
Org. Geochem.,
66, 164–173, https://doi.org/10.1016/j.orggeochem.2013.10.017, 2014.
Ng, S. L. and King, R. H.:
Development of a diatom-based specific conductivity model for the glacioisostatic lakes of Truelove Lowland: Implications for paleoconductivity and paleoenvironmental reconstructions in Devon Island lakes, N. W. T., Canada,
J. Paleolimnol.,
22, 367–382, https://doi.org/10.1023/A:1008022501117, 1999.
Ning, D., Zhang, E., Shulmeister, J., Chang, J., Sun, W., and Ni, Z.:
Holocene mean annual air temperature (MAAT) reconstruction based on branched glycerol dialkyl glycerol tetraethers from Lake Ximenglongtan, southwestern China,
Org. Geochem.,
133, 65–76, https://doi.org/10.1016/j.orggeochem.2019.05.003, 2019.
Nürnberg, G. K.:
Quantifying anoxia in lakes,
Limnol. Oceanogr.,
40, 1100–1111, https://doi.org/10.4319/lo.1995.40.6.1100, 1995.
Pearson, E. J., Juggins, S., Talbot, H. M., Weckström, J., Rosén, P., Ryves, D. B., Roberts, S. J., and Schmidt, R.:
A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes,
Geochim. Cosmochim. Ac.,
75, 6225–6238, https://doi.org/10.1016/j.gca.2011.07.042, 2011.
Pérez-Angel, L. C., Sepúlveda, J., Molnar, P., Montes, C., Rajagopalan, B., Snell, K., Gonzalez-Arango, C., and Dildar, N.:
Soil and Air Temperature Calibrations Using Branched GDGTs for the Tropical Andes of Colombia: Toward a Pan-Tropical Calibration,
Geochem. Geophy. Geosy.,
21, 1–18, https://doi.org/10.1029/2020gc008941, 2020.
Peterse, F., Meer, J. Van Der, Schouten, S., Weijers, J. W. H., Fierer, N., Jackson, R. B., Kim, J., and Damste, J. S. S.:
Revised calibration of the MBT – CBT paleotemperature proxy based on branched tetraether membrane lipids in surface soils,
Geochim. Cosmochim. Ac.,
96, 215–229, https://doi.org/10.1016/j.gca.2012.08.011, 2012.
Peterse, F., Vonk, J. E., Holmes, R. M., Giosan, L., Zimov, N., and Eglinton, T. I.:
Branched glycerol dialkyl glycerol tetraethers in Arctic lake sediments: Sources and implications for paleothermometry at high latitudes,
J. Geophys. Res.-Biogeo.,
119, 1738–1754, https://doi.org/10.1002/2014JG002639, 2014.
Prahl, F. G. and Wakeham, S. G.:
Calibration of unsaturation patterns in long-chain ketone compositions for palaeotemperature assessment,
Nature,
330, 367–369, https://doi.org/10.1038/330367a0, 1987.
Qian, S., Yang, H., Dong, C., Wang, Y., Wu, J., Pei, H., Dang, X., Lu, J., Zhao, S., and Xie, S.:
Rapid response of fossil tetraether lipids in lake sediments to seasonal environmental variables in a shallow lake in central China: Implications for the use of tetraether-based proxies,
Org. Geochem.,
128, 108–121, https://doi.org/10.1016/j.orggeochem.2018.12.007, 2019.
Raberg, J. H., Harning, D. J., Crump, S. E., de Wet, G. A., Blumm, A., Kopf, S., Geirsdóttir, Á., Miller, G. H., and Sepúlveda, J.: brGDGT distributions and environmental parameters of lake sediments from the Eastern Canadian Arctic and Iceland, 2003–2019, PANGAEA [data set], https://doi.pangaea.de/10.1594/PANGAEA.931003, 2021.
R Core Team: R: A language and environment for statistical computing, R Foundation for Statistical Computing, Vienna, Austria, available at: https://www.R-project.org/, last access: 15 February 2021.
Raynolds, M. K., Comiso, J. C., Walker, D. A., and Verbyla, D.:
Relationship between satellite-derived land surface temperatures, arctic vegetation types, and NDVI,
Remote Sens. Environ.,
112, 1884–1894, https://doi.org/10.1016/j.rse.2007.09.008, 2008.
Reizer, J., Grossowicz, N., and Barenholz, Y.:
The effect of growth temperature on the thermotropic behavior of the membranes of a thermophilic Bacillus. Composition-structure-function relationships,
BBA-Biomembranes,
815, 268–280, https://doi.org/10.1016/0005-2736(85)90297-4, 1985.
Russell, J. M., Hopmans, E. C., Loomis, S. E., Liang, J., and Sinninghe Damsté, J. S.:
Distributions of 5- and 6-methyl branched glycerol dialkyl glycerol tetraethers (brGDGTs) in East African lake sediment: Effects of temperature, pH, and new lacustrine paleotemperature calibrations,
Org. Geochem.,
117, 56–69, 2018.
Schouten, S., Hopmans, E. C., Schefuß, E., and Sinninghe Damsté, J. S.:
Distributional variations in marine crenarchaeotal membrane lipids: A new tool for reconstructing ancient sea water temperatures?,
Earth Planet. Sc. Lett.,
204, 265–274, https://doi.org/10.1016/S0012-821X(02)00979-2, 2002.
Schouten, S., Hopmans, E. C., and Sinninghe Damsté, J. S.:
The organic geochemistry of glycerol dialkyl glycerol tetraether lipids: A review,
Org. Geochem.,
54, 19–61, https://doi.org/10.1016/j.orggeochem.2012.09.006, 2013.
Schwarz, G.:
Estimating the Dimension of a Model,
Ann. Stat.,
6, 461–464, https://doi.org/10.1214/aos/1176344136, 1978.
Shanahan, T. M., Hughen, K. A., and Van Mooy, B. A. S.:
Temperature sensitivity of branched and isoprenoid GDGTs in Arctic lakes,
Org. Geochem.,
64, 119–128, https://doi.org/10.1016/j.orggeochem.2013.09.010, 2013.
Sinninghe Damsté, J. S.:
Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia),
Geochim. Cosmochim. Ac.,
186, 13–31, https://doi.org/10.1016/j.gca.2016.04.033, 2016.
Sinninghe Damsté, J. S., Hopmans, E. C., Pancost, R. D., Schouten, S., and Geenevasen, J. A. J.:
Newly discovered non-isoprenoid glycerol dialkyl glycerol tetraether lipids in sediments,
Chem. Commun.,
0, 1683–1684, https://doi.org/10.1039/b004517i, 2000.
Sinninghe Damsté, J. S., Rijpstra, W. I. C., Foesel, B. U., Huber, K. J., Overmann, J., Nakagawa, S., Kim, J. J., Dunfield, P. F., Dedysh, S. N., and Villanueva, L.:
An overview of the occurrence of ether- and ester-linked iso-diabolic acid membrane lipids in microbial cultures of the Acidobacteria: Implications for brGDGT paleoproxies for temperature and pH,
Org. Geochem.,
124, 63–76, https://doi.org/10.1016/j.orggeochem.2018.07.006, 2018.
Stager, J. C., Ryves, D. B., King, C., Madson, J., Hazzard, M., Neumann, F. H., and Maud, R.:
Late Holocene precipitation variability in the summer rainfall region of South Africa,
Quaternary Sci. Rev.,
67, 105–120, https://doi.org/10.1016/j.quascirev.2013.01.022, 2013.
Sun, Q., Chu, G., Liu, M., Xie, M., Li, S., Ling, Y., Wang, X., Shi, L., Jia, G., and Lü, H.:
Distributions and temperature dependence of branched glycerol dialkyl glycerol tetraethers in recent lacustrine sediments from China and Nepal,
J. Geophys. Res.-Biogeo.,
116, G01008, https://doi.org/10.1029/2010JG001365, 2011.
Super, J. R., Chin, K., Pagani, M., Li, H., Tabor, C., Harwood, D. M., and Hull, P. M.:
Late Cretaceous climate in the Canadian Arctic: Multi-proxy constraints from Devon Island,
Palaeogeogr. Palaeoclim.,
504, 1–22, https://doi.org/10.1016/j.palaeo.2018.03.004, 2018.
Thomas, E. K., Castañeda, I. S., McKay, N. P., Briner, J. P., Salacup, J. M., Nguyen, K. Q., and Schweinsberg, A. D.:
A Wetter Arctic Coincident With Hemispheric Warming 8,000 Years Ago,
Geophys. Res. Lett.,
45, 10637–10647, https://doi.org/10.1029/2018GL079517, 2018.
Tierney, J. E. E., Russell, J. M. M., Eggermont, H., Hopmans, E. C. C., Verschuren, D., and Sinninghe Damsté, J. S. S.:
Environmental controls on branched tetraether lipid distributions in tropical East African lake sediments,
Geochim. Cosmochim. Ac.,
74, 4902–4918,
available at: https://www.sciencedirect.com/science/article/pii/S0016703710003236 (last access: 17 September 2018), 2010.
Tyler, J. J., Nederbragt, A. J., Jones, V. J., and Thurow, J. W.:
Assessing past temperature and soil pH estimates from bacterial tetraether membrane lipids: Evidence from the recent lake sediments of Lochnagar, Scotland,
J. Geophys. Res.,
115, G01015, https://doi.org/10.1029/2009JG001109, 2010.
van Bree, L. G. J., Peterse, F., Baxter, A. J., De Crop, W., van Grinsven, S., Villanueva, L., Verschuren, D., and Sinninghe Damsté, J. S.: Seasonal variability and sources of in situ brGDGT production in a permanently stratified African crater lake, Biogeosciences, 17, 5443–5463, https://doi.org/10.5194/bg-17-5443-2020, 2020.
Venables, W. N. and Ripley, B. D.:
Modern Applied Statistics with S, 4th Edn.,
Springer, New York, 2002.
Weber, Y., De Jonge, C., Rijpstra, W. I. C., Hopmans, E. C., Stadnitskaia, A., Schubert, C. J., Lehmann, M. F., Sinninghe Damsté, J. S., and Niemann, H.:
Identification and carbon isotope composition of a novel branched GDGT isomer in lake sediments: Evidence for lacustrine branched GDGT production,
Geochim. Cosmochim. Ac.,
154, 118–129, https://doi.org/10.1016/j.gca.2015.01.032, 2015.
Weber, Y., Damsté, J. S. S., Zopfi, J., De Jonge, C., Gilli, A., Schubert, C. J., Lepori, F., Lehmann, M. F., and Niemann, H.:
Redox-dependent niche differentiation provides evidence for multiple bacterial sources of glycerol tetraether lipids in lakes,
P. Natl. Acad. Sci. USA,
115, 10926–10931, https://doi.org/10.1073/pnas.1805186115, 2018.
Weijers, J. W. H., Schouten, S., Spaargaren, O. C., and Sinninghe Damsté, J. S.:
Occurrence and distribution of tetraether membrane lipids in soils: Implications for the use of the TEX86 proxy and the BIT index,
Org. Geochem.,
37, 1680–1693, https://doi.org/10.1016/j.orggeochem.2006.07.018, 2006.
Weijers, J. W. H., Schouten, S., van den Donker, J. C., Hopmans, E. C., and Sinninghe Damsté, J. S.:
Environmental controls on bacterial tetraether membrane lipid distribution in soils,
Geochim. Cosmochim. Ac.,
71, 703–713, https://doi.org/10.1016/j.gca.2006.10.003, 2007.
Wetzel, R. G.:
Salinity of Inland Waters,
in: Limnology,
edited by: Wetzel, R. G.,
Academic Press, San Diego, California, 169–186, 2001.
Woltering, M., Werne, J. P., Kish, J. L., Hicks, R., Sinninghe Damsté, J. S., and Schouten, S.:
Vertical and temporal variability in concentration and distribution of thaumarchaeotal tetraether lipids in Lake Superior and the implications for the application of the TEX 86 temperature proxy,
Geochim. Cosmochim. Ac.,
87, 136–153, https://doi.org/10.1016/j.gca.2012.03.024, 2012.
Wörmer, L., Lipp, J. S., Schröder, J. M., and Hinrichs, K. U.:
Application of two new LC-ESI-MS methods for improved detection of intact polar lipids (IPLs) in environmental samples,
Org. Geochem.,
59, 10–21, https://doi.org/10.1016/j.orggeochem.2013.03.004, 2013.
Xiao, W., Wang, Y., Liu, Y., Zhang, X., Shi, L., and Xu, Y.: Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication, Biogeosciences, 17, 2135–2148, https://doi.org/10.5194/bg-17-2135-2020, 2020.
Yang, X., Wang, S., Kamenik, C., Schmidt, R., Shen, J., Zhu, L., and Li, S.: Diatom assemblages and quantitative reconstruction for paleosalinity from a sediment core of Chencuo Lake, southern Tibet,
Sci. China, Ser. D,
47, 522–528, https://doi.org/10.1360/02yd0142, 2004.
Yao, Y., Zhao, J., Vachula, R. S., Werne, J. P., Wu, J., Song, X., and Huang, Y.:
Correlation between the ratio of 5-methyl hexamethylated to pentamethylated branched GDGTs (HP5) and water depth reflects redox variations in stratified lakes,
Org. Geochem.,
147, 104076, https://doi.org/10.1016/j.orggeochem.2020.104076, 2020.
Yuk, H. G. and Marshall, D. L.:
Adaptation of Escherichia coli O157:H7 to pH alters membrane lipid composition, verotoxin secretion, and resistance to simulated gastric fluid acid,
Appl. Environ. Microb.,
70, 3500–3505, https://doi.org/10.1128/AEM.70.6.3500-3505.2004, 2004.
Zhang, Z. X., Li, J., Chen, Z., Sun, Z., Yang, H., Fu, M., and Peng, X.:
The effect of methane seeps on the bacterial tetraether lipid distributions at the Okinawa Trough,
Mar. Chem.,
225, 103845, https://doi.org/10.1016/j.marchem.2020.103845, 2020.
Zhao, B., Castañeda, I. S., Bradley, R. S., Salacup, J. M., de Wet, G. A., Daniels, W. C., and Schneider, T.:
Development of an in situ branched GDGT calibration in Lake 578, southern Greenland,
Org. Geochem.,
152, 104168, https://doi.org/10.1016/j.orggeochem.2020.104168, 2021.
Zhao, J., Huang, Y., Yao, Y., An, Z., Zhu, Y., Lu, H., and Wang, Z.:
Calibrating branched GDGTs in bones to temperature and precipitation: Application to Alaska chronological sequences,
Quaternary Sci. Rev.,
240, 106371, https://doi.org/10.1016/j.quascirev.2020.106371, 2020.
Zheng, Y., Pancost, R. D., Liu, X., Wang, Z., Naafs, B. D. A., Xie, X., Liu, Z., Yu, X., and Yang, H.:
Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China,
Geology,
45, 1031–1034, https://doi.org/10.1130/G39401.1, 2017.
Short summary
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.
BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can...
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