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An analysis of the current deflection around Dongsha Islands in the northern South China Sea
[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; wqiang@scsio.ac.cn
2013
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN0148-0227
Volume118Issue:1Pages:490-501
AbstractBased 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.
DepartmentLTO
Subject AreaOceanography
Funding OrganizationThis 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. ; 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. ; 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. ; 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.
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Language英语
Funding OrganizationThis 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. ; 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. ; 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. ; 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.
WOS IDWOS:000317836100034
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/10941
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorwqiang@scsio.ac.cn
Recommended Citation
GB/T 7714
[Wang, Dongxiao,Wang, Qiang,Zhou, Weidong,et al. An analysis of the current deflection around Dongsha Islands in the northern South China Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2013,118(1):490-501.
APA [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.,...&wqiang@scsio.ac.cn.(2013).An analysis of the current deflection around Dongsha Islands in the northern South China Sea.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,118(1),490-501.
MLA [Wang, Dongxiao,et al."An analysis of the current deflection around Dongsha Islands in the northern South China Sea".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 118.1(2013):490-501.
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