Interaction of a river plume with coastal upwelling in the northeastern South China Sea
Gan, JP; Li, L; Wang, DX; Guo, XG; magan@ust.hk
2009
发表期刊CONTINENTAL SHELF RESEARCH
ISSN0278-4343
卷号29期号:4页码:728-740
摘要Observational and modeling studies were conducted to investigate the Pearl River plume and its interaction with the southwesterly driven upwelling circulation in the northern South China Sea during the summer. After exiting the Pearl River Estuary, the discharged freshwater generates a nearly Stationary bulge of freshwater near the entrance of the estuary. Forced by the wind-driven coastal upwelling current, the freshwater in the outer part of the bulge flows downstream at the speed of the current and forms a widening and deepening buoyant plume over the shelf. The plume axis gradually shifts offshore of the Current maximum as a result of currents induced by the contrasting density at the nose Of plume and by the intensified Ekman drift in the Plume. In this plume-current system, the fraction of the discharged freshwater volume accumulated in the bulge reaches a steady state and the Volume of newly discharged freshwater is transported downstream by the upwelling Current. Enhancement of stratification by the plume thins the Surface frictional layer and enhances the cross-shelf circulation in the upper water column such that the surface Ekman current and compensating flow beneath the plume are amplified while the shoaling of the deeper dense water in the upwelling region changes minimally. The pressure gradient generated between the buoyant plume and ambient seawater accelerates the wind-driven Current along the inshore edge of the plume but retards it along the offshore edge. Along the plume, downward momentum advection is strong near the highly nonlinear Source region and a weaker upward momentum advection occurs in the far field over the shelf. Typically, the plume is shaped by the current over the shelf while the Current itself is adjusting to a new dynamic balance invoked by the plume-induced changes of vertical viscosity and the horizontal pressure gradient. The spatial variation of this new balance leads to a coherent change in the cross-isobath transport in the upper water column during upwelling. (C) 2008 Elsevier Ltd. All Fights reserved.
部门归属[Gan, Jianping] Hong Kong Univ Sci & Technol, Dept Math, Kowloon, Hong Kong, Peoples R China; [Gan, Jianping] Hong Kong Univ Sci & Technol, Atmospher Marine & Coastal Environm Program, Kowloon, Hong Kong, Peoples R China; [Li, Li; Guo, Xiaogang] State Ocean Adm, Inst Oceanog 3, Xiamen, Peoples R China; [Wang, Dongxiao] Chinese Acad Sci, LED, S China Sea Inst Oceanog, Guangzhou, Guangdong, Peoples R China
关键词Coastal Upwelling River Plume Buoyancy Forcing
学科领域Oceanography
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收录类别sci
资助项目LED
WOS记录号WOS:000264910200004
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被引频次:124[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/6133
专题热带海洋环境国家重点实验室(LTO)
通讯作者magan@ust.hk
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Gan, JP,Li, L,Wang, DX,et al. Interaction of a river plume with coastal upwelling in the northeastern South China Sea[J]. CONTINENTAL SHELF RESEARCH,2009,29(4):728-740.
APA Gan, JP,Li, L,Wang, DX,Guo, XG,&magan@ust.hk.(2009).Interaction of a river plume with coastal upwelling in the northeastern South China Sea.CONTINENTAL SHELF RESEARCH,29(4),728-740.
MLA Gan, JP,et al."Interaction of a river plume with coastal upwelling in the northeastern South China Sea".CONTINENTAL SHELF RESEARCH 29.4(2009):728-740.
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