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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
发表期刊GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷号19期号:5页码:1447-1463
摘要The 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.
部门归属[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
学科领域Geochemistry & Geophysics
关键词[WOS]deep hydrographic structure ; oxygen and carbon isotopes ; deep circulation ; Last Glacial Maximum ; South China Sea
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17135
专题中科院边缘海地质重点实验室
通讯作者jian@tongji.edu.cn
推荐引用方式
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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