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Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2
Wan, Shiming1,2,3; Clift, Peter D.4,5; Zhao, Debo1; Hovius, Niels6; Munhoven, Guy7; France-Lanord, Christian3; Wang, Yinxi2,8; Xiong, Zhifang1; Huang, Jie1; Yu, Zhaojie9; Zhang, Jin1; Ma, Wentao10; Zhang, Guoliang1; Li, Anchun1; Li, Tiegang11
2017-03-01
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
卷号200页码:123-144
文章类型Article
摘要Atmospheric CO2 and global climate are closely coupled. Since 800 ka CO2 concentrations have been up to 50% higher during interglacial compared to glacial periods. Because of its dependence on temperature, humidity, and erosion rates, chemical weathering of exposed silicate minerals was suggested to have dampened these cyclic variations of atmospheric composition. Cooler and drier conditions and lower non-glacial erosion rates suppressed in situ chemical weathering rates during glacial periods. However, using systematic variations in major element geochemistry, Sr-Nd isotopes and clay mineral records from Ocean Drilling Program Sites 1143 and 1144 in the South China Sea spanning the last 1.1 Ma, we show that sediment deposited during glacial periods was more weathered than sediment delivered during interglacials. We attribute this to sub-aerial exposure and weathering of unconsolidated shelf sediments during glacial sealevel lowstands. Our estimates suggest that enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands can account for similar to 9% of the carbon dioxide removed from the atmosphere during the glacial and thus represent a significant part of the observed glacial-interglacial variation of similar to 80 ppmv. As a result, if similar magnitudes can be identified in other tropical shelf-slope systems, the effects of increased sediment exposure and subsequent silicate weathering during lowstands could have potentially enhanced the drawdown of atmospheric CO2 during cold stages of the Quaternary. This in turn would have caused an intensification of glacial cycles. (C) 2016 Elsevier Ltd. All rights reserved.
关键词Chemical Weathering Climate Change Carbon Cycle Glacial-interglacial South China Sea Tropical Continental Shelf Elements Geochemistry Clay Minerals
DOI10.1016/j.gca.2016.12.010
收录类别SCI
语种英语
WOS记录号WOS:000396792700008
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/136775
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Natl Oceanog Lab, Funct Lab Marine Geol, Qingdao 266061, Peoples R China
3.CNRS Univ Lorraine, Ctr Rech Petrograph & Geochim, UPR 2300, 15 Rue Notre Dame Pauvres, F-54501 Vandoeuvre Les Nancy, France
4.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
5.Nanjing Normal Univ, Sch Geog Sci, Nanjing 210023, Peoples R China
6.Deutsch GeoForschungsZentrum GFZ Potsdam, Potsdam, Germany
7.Univ Liege, Inst Astrophys & Geophys, LPAP, Liege, Belgium
8.Nanjing Univ, Ctr Modern Anal, Nanjing 210093, Peoples R China
9.Univ Paris 11, UMR 8148 CNRS, Lab IDES, F-91405 Orsay, France
10.Tongji Univ, State Key Lab Marine Geol, 1239 Siping Rd, Shanghai 200092, Peoples R China
11.State Ocean Adm, First Inst Oceanog, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China
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Wan, Shiming,Clift, Peter D.,Zhao, Debo,et al. Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2017,200:123-144.
APA Wan, Shiming.,Clift, Peter D..,Zhao, Debo.,Hovius, Niels.,Munhoven, Guy.,...&Li, Tiegang.(2017).Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2.GEOCHIMICA ET COSMOCHIMICA ACTA,200,123-144.
MLA Wan, Shiming,et al."Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2".GEOCHIMICA ET COSMOCHIMICA ACTA 200(2017):123-144.
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