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学科主题: Geography, Physical; Geosciences, Multidisciplinary
题名: Glacial paleoceanography off the mouth of the Mekong River, southern South China Sea, during the last 500 ka
作者: Li, QY ; Zheng, F ; Chen, MH ; Xiang, R ; Qiao, PJ ; Shao, L ; Cheng, XR
通讯作者: qli01@tongji.edu.cn
关键词: Late Pleistocene Holocene ; Glacial cycles ; Planktonic foraminifera ; Thermocline ; Monsoons ; South China Sea ; Mekong River mouth
刊名: QUATERNARY RESEARCH
发表日期: 2010
卷: 73, 期:3, 页:563-572
收录类别: sci
部门归属: [Li, Qianyu; Qiao, Peijun; Shao, Lei; Cheng, Xinrong] Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China; [Li, Qianyu] Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia; [Zheng, Fan; Chen, Muhong; Xiang, Rong] Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
项目归属: 海洋地质
摘要: We have analyzed core MD01-2392, similar to 360 km east of the Mekong River mouth in the South China Sea (SCS). Over the past 500 ka, planktonic foraminiferal oxygen-isotopic values are consistently lighter than northern SCS and open-ocean records by up to 0.5 parts per thousand, indicating the influence of run-off from the Mekong River during both glacial and interglacial periods. Carbonate content is higher during interglacials; sedimentation rates were higher during glacials. Increased sedimentation rates since 30 ka imply increased run-off during the last glacial maximum and Holocene Period. Contrary to general experience, in which it is classed as a warm species for temperature estimates, the thermocline-dwelling species Pulleniatina obliquiloculata increased its numbers during glacial periods. This implies an estuarine circulation and even brackish-water caps during glacial periods, reinforcing the sense of strong run-off. In an overall decline of warm water, the thermocline shoaled stepwise, with rapid rises across the glacial terminations. We infer that the southern SCS was opened to an influx of Indian Ocean waters through southern passages at those times of rising sea levels. (C) 2010 University of Washington. Published by Elsevier Inc. All rights reserved.
原文出处: 查看原文
WOS记录号: WOS:000277557200014
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4324
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Li, QY; Zheng, F; Chen, MH; Xiang, R; Qiao, PJ; Shao, L; Cheng, XR.Glacial paleoceanography off the mouth of the Mekong River, southern South China Sea, during the last 500 ka,QUATERNARY RESEARCH,2010,73(3):563-572
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