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Deep Hydrography of the South China Sea and Deep Water Circulation in the Pacific Since the Last Glacial Maximum
Wan, S; Jian, ZM; Dang, HW; jian@tongji.edu.cn
2018
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume19Issue:5Pages:1447-1463
AbstractThe oxygen (O-18) and carbon (C-13) isotopic compositions of benthic foraminifer Cibicidoides wuellerstorfi as reliable proxies of deep water properties were compiled from 50 core-top and down-core sites in the South China Sea (SCS) for two time slices of the late Holocene and Last Glacial Maximum (LGM) to reconstruct the glacial deep hydrographic structure. The bathymetric profiles of both O-18 and C-13 in the SCS show similar trends between the LGM and the late Holocene, but the O-18 gradients between intermediate (approximate to 500-1,000 m) and deep (>1,500 m) waters obviously increased during the LGM, indicating an intensified bathyal stratification and weakened vertical mixing between intermediate and deep waters in the SCS during the glacial period. A spatial comparison of bathymetric O-18 and C-13 profiles was also made for the Southern Ocean (Indo-Pacific sector) and southwest Pacific, western equatorial Pacific (i.e., Ontong Java Plateau), off-Japan margin as well as the SCS. The meridional C-13 profiles indicate a decreasing trend of C-13 (aging effect) in the deep layer (approximate to 1,200-2,600 m) from south to north, reflecting a northward flow pathway of deep waters from the southwest Pacific (upstream) to the low-latitude northwest Pacific and the SCS (downstream) during the LGM. The gradients of deep water O-18 (approximate to 1,200-2,600 m) between these upstream and downstream regions were higher during the LGM relative to the Holocene, implying that a greater contribution of the northern-sourced North Pacific Intermediate Water (NPIW) with a relatively low O-18 signature to the deep waters in the low-latitude Pacific during the LGM.
Department[Wan, Sui] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China; [Wan, Sui; Jian, Zhimin; Dang, Haowen] Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China
Subject AreaGeochemistry & Geophysics
WOS Keyworddeep hydrographic structure ; oxygen and carbon isotopes ; deep circulation ; Last Glacial Maximum ; South China Sea
Funding ProjectMSG
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17135
Collection中科院边缘海地质重点实验室
Corresponding Authorjian@tongji.edu.cn
Recommended Citation
GB/T 7714
Wan, S,Jian, ZM,Dang, HW,et al. Deep Hydrography of the South China Sea and Deep Water Circulation in the Pacific Since the Last Glacial Maximum[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2018,19(5):1447-1463.
APA Wan, S,Jian, ZM,Dang, HW,&jian@tongji.edu.cn.(2018).Deep Hydrography of the South China Sea and Deep Water Circulation in the Pacific Since the Last Glacial Maximum.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(5),1447-1463.
MLA Wan, S,et al."Deep Hydrography of the South China Sea and Deep Water Circulation in the Pacific Since the Last Glacial Maximum".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.5(2018):1447-1463.
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