Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2

doi:10.1016/j.gca.2016.12.010

CORC > 自然资源部第一海洋研究所 > 自然资源部第一海洋研究所 > 业务部门 > 海洋地质与地球物理研究室

	Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2
	Wan, Shiming 1,2,3; Clift, Peter D.4,5; Zhao, Debo 1; Hovius, Niels 6; Munhoven, Guy 7; France-Lanord, Christian 3; Wang, Yinxi 2,8; Xiong, Zhifang 1; Huang, Jie 1; Yu, Zhaojie 9
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2017-03
卷号	200 页码:123-144
关键词	Chemical weathering Climate change Carbon cycle Glacial-interglacial South China Sea Tropical continental shelf Elements geochemistry Clay minerals
ISSN号	0016-7037
DOI	10.1016/j.gca.2016.12.010
英文摘要	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.
资助项目	Chinese Continental Shelf Drilling Program[GZH201100202]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000396792700008
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3208]
专题	业务部门_海洋地质与地球物理研究室
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;
推荐引用方式 GB/T 7714	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.