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学科主题: Oceanography
题名: An analysis of the current deflection around Dongsha Islands in the northern South China Sea
作者: [Wang, Dongxiao ; Wang, Qiang ; Zhou, Weidong ; Cai, Shuqun] Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China ; [Wang, Qiang] Chinese Acad Sci, Grad Sch, Beijing, Peoples R China ; [Li, Li] State Ocean Adm, Inst Oceanog 3, Xiamen, Peoples R China ; [Hong, Bo] Coll William & Mary, Virginia Inst Marine Sci, Williamsburg, VA 23187 USA
通讯作者: wqiang@scsio.ac.cn
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2013
卷: 118, 期:1, 页:490-501
部门归属: LTO
资助者: This work is supported by National Basic Research Program of China (Grant No. 2011CB403504), Natural Science Foundation of China (Grant No. 91228202), Knowledge Innovation Project for Distinguished Young Scholar of the Chinese Academy of Sciences (Grant No. KZCX2-EW-QN203) and National Natural Science Foundation of China (Grant No. 40776009). We would like to thank two anonymous reviewers for comments that helped to improve the manuscript.
摘要: Based on the in situ data and ADCP observation in fall, it is found that a northeastward current at inter-middle level flows on the Northern South China Sea (NSCS) continental shelf. This current flows almost along the isobaths, and it deflects from the isobaths veering toward deep water when flowing over the Dongsha Islands. Geographic currents derived from the climatologic hydrography data (WOA01) and absolute dynamic topography (ADT) data confirm the deflection of the northeastward current on NSCS continent. A fine resolution regional ocean model which can well reproduce the large scale circulation in the NSCS is used to analyze the dynamic about the deflection. The vorticity term balances shows that JEBAR (Joint Effect of Baroclinicity and Relief) drives the water column to depart from the isobaths. To the east of the Dongsha Islands, the isopycnal is almost orthogonal to the isobaths. The joint effect of the topographic and the baroclinic effect supplies negative vorticity and drives the water column to deflect from the isobaths and veer to deeper water. Momentum analysis along the stream line shows that, when the sea water flows around the Dongsha islands, the pressure gradient along the isobath pushes the sea water to accelerate, and then the Coriolis force orthogonal to the isobath increases and overcomes the corresponding pressure gradient, which drives the water deflected from the isobath toward the deep sea. Citation: Wang, D., Q. Wang, W. Zhou, S. Cai, L. Li, and B. Hong (2013), An analysis of the current deflection around Dongsha Islands in the northern South China Sea, J. Geophys. Res. Oceans, 118, 490-501, doi:10.1029/2012JC008429.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000317836100034
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10941
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[Wang, Dongxiao; Wang, Qiang; Zhou, Weidong; Cai, Shuqun] Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China; [Wang, Qiang] Chinese Acad Sci, Grad Sch, Beijing, Peoples R China; [Li, Li] State Ocean Adm, Inst Oceanog 3, Xiamen, Peoples R China; [Hong, Bo] Coll William & Mary, Virginia Inst Marine Sci, Williamsburg, VA 23187 USA.An analysis of the current deflection around Dongsha Islands in the northern South China Sea,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2013,118(1):490-501
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