Peatland GDGT records of Holocene climatic and biogeochemical responses to the Asian Monsoon |
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| Institution: | 1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, PR China;2. Organic Geochemistry Unit, School of Chemistry, Cabot Institute, University of Bristol, Cantock’s Close, Bristol BS8 1TS, UK;3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, PR China;1. NIOZ Royal Netherlands Institute for Sea Research, NL-1790 AB Den Burg, The Netherlands;2. University of South Florida, College of Marine Science, 140 7th Avenue South, St. Petersburg, FL 33701, USA;3. Duke University, Nicolas School of the Environment, 301 Old Chemistry, Box 90227, Durham, NC 27708, USA;4. Departamento de Geologia, Universidade Federal Fluminense, Niterói, RJ, Brazil;5. University of Washington, School of Oceanography, Seattle, WA 98195, USA;1. State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. Organic Geochemistry Unit, Bristol Biogeochemistry Research Centre and The Cabot Institute, School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, UK;1. State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, UK;3. University of Bristol Cabot Institute, University of Bristol, Bristol BS8 1UJ, UK;1. CAS Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;3. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;4. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;5. University of Chinese Academy of Sciences, Beijing 100049, China;1. Organic Geochemistry Unit, School of Chemistry, University of Bristol, Bristol, UK;2. Cabot Institute, University of Bristol, Bristol, UK;3. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, PR China;4. Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK;5. Institut für Geoökölogie, AG Umweltgeochemie, Technische Universität Braunschweig, Braunschweig, Germany;6. Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden;7. Australian National University, Acton, Canberra, Australia;8. Instituto de Investigaciones de la Amazonía Peruana (IIAP), Iquitos, Peru;9. Centre for Environmental Change and Quaternary Research, School of Natural and Social Sciences, University of Gloucestershire, Cheltenham, UK;10. Department of Earth and Ocean Sciences, University of South Carolina, Columbia, USA;11. Department of Earth Sciences, University of Southern California, Los Angeles, USA;12. Department of Biogeography and Paleoecology, Adam Mickiewicz University in Poznań, Poznań, Poland;13. ECOLAB, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France;14. Pinelands Field Station, Rutgers University, New Lisbon, USA;15. Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, USA;p. Palaeoecology Laboratory, University of Southampton, Southampton, UK;q. Sorbonne Universités, UPMC, Univ Paris 06, CNRS, EPHE, UMR 7619 METIS, Paris, France;r. Department of Forest Sciences, University of Helsinki, Finland;s. Université d’Orléans/CNRS/BRGM, ISTO, UMR 7327, Orléans, France;t. Department of Biology, University of Turku, Finland;u. Laboratory of Wetland Ecology and Monitoring & Department of Biogeography and Paleoecology, Adam Mickiewicz University in Poznań, Poznań, Poland;v. York Institute for Tropical Ecosystems, Environment Department, Wentworth Way University of York, York, UK;w. Department of Geography, Durham University, Durham, UK;x. Departamento de Edafoloxía e Química Agrícola, Universidade de Santiago de Compostela, Santiago de Compostela, Spain;y. Department of Marine Geosciences, University of Miami – RSMAS, Miami, USA;z. Department of Chemistry, Claflin University, Orangeburg, USA;11. Peatland Ecology Research Group (PERG), Centre for Northern Studies, Université Laval, Quebec City, Canada;12. Department of Soil Science, University of São Paulo, Piracicaba, Brazil |
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| Abstract: | Branched and isoprenoidal glycerol dialkyl glycerol tetraether (GDGT) membrane lipids have been widely used to reconstruct past climate and environmental change. They are not, however, widely applied to peat deposits and the controls on their distributions in peats remain unclear. Here, we present a high resolution record of branched and isoprenoid GDGT concentrations and distributions from a peat core from the Tibetan Plateau that spans the last 13 kyr, a period characterised by distinct dry and wet periods in the region. The lowest concentrations of total branched glycerol dialkyl glycerol tetraethers (brGDGTs) occurred during a presumably dry interval in the mid-Holocene, suggesting that brGDGTs-producing bacteria are less productive under such conditions, perhaps reflecting their putative anaerobic ecology. The mean annual air temperature (MAT) estimates derived from the methylation index of brGDGTs and cyclisation ratio of brGDGTs (MBT′/CBT) are higher than present mean annual temperature in the region and closer to summer temperatures, perhaps due to seasonal production of brGDGTs. The downcore distributions of isoprenoidal and branched GDGTs are dominated by GDGT-0 and brGDGT II, respectively. The high fractional abundances of GDGT-0 in warm and especially wet intervals suggest that these conditions are favourable for some groups of methanogenic archaea. The mid-Holocene dry interval is associated with an increase in the fractional and absolute abundance of crenarchaeol, which could be indicative of enhanced ammonia-oxidising archaeal-mediated nitrogen cycling under these conditions. Taken together, variations of GDGT concentrations in peats appear to document the response of microbial processes to climate change and variations in the biogeochemical environment. |
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| Keywords: | Peatland GDGTs Holocene climate Asian summer monsoon Tibetan Plateau |
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