IOCAS-IR  > 海洋地质与环境重点实验室
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
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
Volume200Pages:123-144
SubtypeArticle
AbstractAtmospheric 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.
KeywordChemical Weathering Climate Change Carbon Cycle Glacial-interglacial South China Sea Tropical Continental Shelf Elements Geochemistry Clay Minerals
DOI10.1016/j.gca.2016.12.010
Indexed BySCI
Language英语
WOS IDWOS:000396792700008
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136775
Collection海洋地质与环境重点实验室
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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.
Files in This Item:
File Name/Size DocType Version Access License
Enhanced silicate we(7035KB)期刊论文出版稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wan, Shiming]'s Articles
[Clift, Peter D.]'s Articles
[Zhao, Debo]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wan, Shiming]'s Articles
[Clift, Peter D.]'s Articles
[Zhao, Debo]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wan, Shiming]'s Articles
[Clift, Peter D.]'s Articles
[Zhao, Debo]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands_ A sink for atmospheric CO2.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.