Vorticity budget study on the seasonal upper circulation in the northern South China Sea from altimetry data and a numerical model
Cai, SQ; Zheng, S; He, YH; caisq@scsio.ac.cn
2012
发表期刊JOURNAL OF OCEAN UNIVERSITY OF CHINA
ISSN1672-5182
卷号11期号:4页码:455-464
摘要Based on the EOF analyses of Absolute Dynamic Topography satellite data, it is found that, in summer, the northern South China Sea (SCS) is dominated by an anticyclonic gyre whilst by a cyclonic one in winter. A connected single-layer and two-layer model is employed here to investigate the dynamic mechanism of the circulation in the northern SCS. Numerical experiments show that the nonlinear term, the pressure torque and the planetary vorticity advection play important roles in the circulation of the northern SCS, whilst the contribution by seasonal wind stress curl is local and limited. Only a small part of the Kuroshio water intrudes into the SCS, it then induces a positive vorticity band extending southwestward from the west of the Luzon Strait (LS) and a negative vorticity band along the 200 m isobath of the northern basin. The positive vorticity field induced by the local summer wind stress curl is weaker than that induced in winter in the northern SCS. Besides the Kuroshio intrusion and monsoon, the water transports via the Sunda Shelf and the Sibutu Passage are also important to the circulation in the northern SCS, and the induced vorticity field in summer is almost contrary to that in winter. The strength variations of these three key factors (Kuroshio, monsoon and the water transports via the Sunda Shelf and the Sibutu Passage) determine the seasonal variations of the vorticity and eddy fields in the northern SCS. As for the water exchange via the LS, the Kuroshio intrusion brings about a net inflow into the SCS, and the monsoon has a less effect, whilst the water transports via the Sunda Shelf and the Sibutu Passage are the most important influencing factors, thus, the water exchange of the SCS with the Pacific via the LS changes dramatically from an outflow of the SCS in summer to an inflow into the SCS in winter.
部门归属[Cai Shuqun; Zheng Shu; He Yinghui] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Zheng Shu] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词Kuroshio South China Sea Circulation Mosoon Vorticity Bifurcation Of North Equatorial Current
学科领域Oceanography
语种英语
资助项目LTO
WOS记录号WOS:000310374500004
引用统计
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10045
专题热带海洋环境国家重点实验室(LTO)
通讯作者caisq@scsio.ac.cn
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GB/T 7714
Cai, SQ,Zheng, S,He, YH,et al. Vorticity budget study on the seasonal upper circulation in the northern South China Sea from altimetry data and a numerical model[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2012,11(4):455-464.
APA Cai, SQ,Zheng, S,He, YH,&caisq@scsio.ac.cn.(2012).Vorticity budget study on the seasonal upper circulation in the northern South China Sea from altimetry data and a numerical model.JOURNAL OF OCEAN UNIVERSITY OF CHINA,11(4),455-464.
MLA Cai, SQ,et al."Vorticity budget study on the seasonal upper circulation in the northern South China Sea from altimetry data and a numerical model".JOURNAL OF OCEAN UNIVERSITY OF CHINA 11.4(2012):455-464.
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