globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2778
论文题名:
Hydrologic control of carbon cycling and aged carbon discharge in the Congo River basin
作者: Schefuß E.; Eglinton T.I.; Spencer-Jones C.L.; Rullkötter J.; De Pol-Holz R.; Talbot H.M.; Grootes P.M.; Schneider R.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:9
起始页码: 687
结束页码: 690
语种: 英语
Scopus关键词: aridification ; carbon cycle ; carbon sequestration ; Holocene ; hydrological regime ; nuclear weapons testing ; organic matter ; precipitation assessment ; radiocarbon dating ; remineralization ; river discharge ; sediment transport ; soil erosion ; Congo Basin
英文摘要: The age of organic material discharged by rivers provides information about its sources and carbon cycling processes within watersheds. Although elevated ages in fluvially transported organic matter are usually explained by erosion of soils and sedimentary deposits, it is commonly assumed that mainly young organic material is discharged from flat tropical watersheds due to their extensive plant cover and rapid carbon turnover. Here we present compound-specific radiocarbon data of terrigenous organic fractions from a sedimentary archive offshore the Congo River, in conjunction with molecular markers for methane-producing land cover reflecting wetland extent. We find that the Congo River has been discharging aged organic matter for several thousand years, with apparently increasing ages from the mid-to the Late Holocene. This suggests that aged organic matter in modern samples is concealed by radiocarbon from atmospheric nuclear weapons testing. By comparison to indicators for past rainfall changes we detect a systematic control of organic matter sequestration and release by continental hydrology, mediating temporary carbon storage in wetlands. As aridification also leads to exposure and rapid remineralization of large amounts of previously stored labile organic matter, we infer that this process may cause a profound direct climate feedback that is at present underestimated in carbon cycle assessments. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105930
Appears in Collections:气候减缓与适应
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作者单位: MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Geological Sciences, ETH Zürich, Zurich, Switzerland; School of Civil Engineering and Geosciences, Newcastle University, Newcastle-upon-Tyne, United Kingdom; Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University of Oldenburg, Oldenburg, Germany; GAIA-Antártica, Center for Climate and Resilience Research (CR)2, Universidad de Magallanes, Punta Arenas, Chile; Institute for Geosciences, Christian-Albrechts-University Kiel, Kiel, Germany; Department of Geography, University of Durham, Durham, United Kingdom; Institute for Ecosystem Research, Christian-Albrechts-University Kiel, Kiel, Germany

Recommended Citation:
Schefuß E.,Eglinton T.I.,Spencer-Jones C.L.,et al. Hydrologic control of carbon cycling and aged carbon discharge in the Congo River basin[J]. Nature Geoscience,2016-01-01,9(9)
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