冬季南海上层环流动力机制的数值研究
The numerical study on the dynamic mechanism of the South China Sea upper circulation in winter
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摘要: 通过利用一个分区性的正压-斜压衔接模式来探讨冬季南海的上层环流特征及其动力机制,结果表明:(1)在南海北部,流态主要受黑潮的影响,除了东沙群岛西南的大陆架海域以及吕宋岛北部西岸附近各为一反气旋涡外,整个南海北部为一气旋式大环流所控制.(2)在南海南部主要是风生环流,源自粤西沿岸的水体在东北季风的作用下顺南海西边界岸线向南流动,形成一支相当强的西边界流;同时,由于受北康暗沙以南的陆架坡底形效应和β效应的作用,使得在南海南部出现以一个反气旋涡在南沙海槽处产生、发展并向西传播乃至衰减的约50d的周期性过程Abstract: An divisional barotropic and baroclinic connection model is employed to study the South China Sea(SCS) upper circulation character istics and its dynamic mechanism in winter.The results are:(1) In the northern SCS, the flow state is mainly affected by Kuroshio,it is controlled by a cyclonic gyre there except in the continental shelf sea areas to the southwest of Dongsha Islands and adjacent to the west shore of northern Luzon Isalnd where there exists an anticyclonic eddy respectively.(2) It is mainly wind-driven current in the southern SCS,the water from alongshore of western Guangdong is driven by the northeast monsoon and then flows southward along the western boundary shorelines of the SCS,thus a rather strong western boundary current is formed;in the meanwhile,due to the actions of β effect and bottom topographic effect of continental shelf to the south of Beikang Shoals,an about 50 d periodic process on which an anticy clonic eddy bears in the Nansha Trough、grows and spreads westward then declines is shown in the southern SCS.
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Key words:
- numerical model /
- South China Sea /
- circulation /
- monsoon /
- eddy /
- fluctuation
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