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学科主题: Oceanography
题名: Relative contributions of local wind and topography to the coastal upwelling intensity in the northern South China Sea
作者: Wang, DX ; Shu, YQ ; Xue, HJ ; Hu, JY ; Chen, J ; Zhuang, W ; Zu, TT ; Xu, JD
通讯作者: shuyeq@scsio.ac.cn
关键词: northern South China Sea ; local wind-driven upwelling ; topographically induced upwelling
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2014
卷: 119, 期:4, 页:2550-2567
收录类别: sci
部门归属: [Wang, Dongxiao ; Shu, Yeqiang ; Xue, Huijie ; Chen, Ju ; Zhuang, Wei ; Zu, TingTing] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China ; [Hu, Jianyu] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China ; [Xu, Jindian] State Ocean Adm, Inst Oceanog 3, Xiamen, Peoples R China
项目归属: LTO
资助者: Ministry of Science and Technology of China [2011CB403504]; National Natural Science Foundation of China [41006011, 41006012]; South China Sea Institute of Oceanology [SQ201001]; Recruitment Program of Global Experts
摘要: Topographically induced upwelling caused by the interaction between large-scale currents and topography was observed during four cruises in the northern South China Sea (NSCS) when the upwelling favorable wind retreated. Using a high-resolution version of the Princeton Ocean Model, we investigate relative contributions of local wind and topography to the upwelling intensity in the NSCS. The results show that the topographically induced upwelling is sensitive to alongshore large-scale currents, which have an important contribution to the upwelling intensity. The topographically induced upwelling is comparable with the wind-driven upwelling at surface and has a stronger contribution to the upwelling intensity than the local wind does at bottom in the near-shore shelf region. The widened shelf to the southwest of Shanwei and west of the Taiwan Banks intensifies the bottom friction, especially off Shantou, which is a key factor for topographically induced upwelling in terms of bottom Ekman transport and Ekman pumping. The local upwelling favorable wind enhances the bottom friction as well as net onshore transport along the 50 m isobath, whereas it has less influence along the 30 m isobath. This implies the local wind is more important in upwelling intensity in the offshore region than in the nearshore region. The contribution of local upwelling favorable wind on upwelling intensity is comparable with that of topography along the 50 m isobath. The effects of local upwelling favorable wind on upwelling intensity are twofold: on one hand, the wind transports surface warm water offshore, and as a compensation of mass the bottom current transports cold water onshore; on the other hand, the wind enhances the coastal current, and the bottom friction in turn increases the topographically induced upwelling intensity. Key Points Report the upwelling during summer monsoon retreats Relative contributions of wind and topography to upwelling intensity How the bottom friction affects the upwelling intensity
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WOS记录号: WOS:000336213200024
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10560
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Wang, DX; Shu, YQ; Xue, HJ; Hu, JY; Chen, J; Zhuang, W; Zu, TT; Xu, JD.Relative contributions of local wind and topography to the coastal upwelling intensity in the northern South China Sea,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2014,119(4):2550-2567
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