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学科主题: Oceanography
题名: Vorticity budget study on the seasonal upper circulation in the northern South China Sea from altimetry data and a numerical model
作者: Cai, SQ ; Zheng, S ; He, YH
通讯作者: caisq@scsio.ac.cn
关键词: Kuroshio ; South China Sea circulation ; mosoon ; vorticity ; bifurcation of North Equatorial Current
刊名: JOURNAL OF OCEAN UNIVERSITY OF CHINA
发表日期: 2012
卷: 11, 期:4, 页:455-464
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
项目归属: LTO
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.
语种: 英语
WOS记录号: WOS:000310374500004
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10045
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Cai, SQ; Zheng, S; He, YH.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,2012,11(4):455-464
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