1998年夏季南海环流的三维结构

廖光洪; 袁耀初; 王彰贵

1998年夏季南海环流的三维结构

1.
卫星海洋环境动力学国家重点实验室, 国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012
2.
国家海洋局, 海洋环境预报中心, 北京, 100081

基金项目: 国家自然科学基金重大国际合作项目(40510073);国家基础研究发展规划项目(G1999043805)

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出版历程
- 收稿日期: 2005-10-15
- 修回日期: 2006-08-04

The three dimensional structure of the circulation in the South China Sea during the summer of 1998

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
National Center for Marine Environmental Forecasts, Beijing 100081, China

摘要

摘要: 利用1998年6月12日至7月6日南海的调查资料,采用三维海流诊断模式,计算了夏季南海三维海流,结合卫星海表面高度距平资料,得到结果如下:(1)南海北部,在吕宋岛以西海域和东沙群岛附近海域,分别存在一个反气旋式涡和东沙群岛西南的气旋式涡.(2)南海中部,越南以东海域出现由暖涡W3和冷涡C3组成的一个准偶极子.在冷涡C3和暖涡W3以北分别存在一个暖涡W2和冷涡C2.(3)在越南近岸存在较强的、北向的西边界射流,此北向射流在14°N附近离岸转为东,并流入两涡W3和C3之间.(4)南海南部,在巴拉望岛的西南海域,100m以浅水层存在反气旋式涡,而在其较深水层,此处变为气旋式涡.(5)南海环流的动力机制有两个:最重要的动力因子为斜压场与地形相互作用项,其次为风应力与地形相互作用项.(6)讨论了夏季南海环流垂向速度w分布,例如在30m层,Ekman抽吸对垂向速度w分布起着重要作用.(7)与2000年夏季南海环流的比较,1998年夏季计算海域涡旋W3,C3,C2等的位置变化并不大.
- 南海环流 /
- 海面高度距平 /
- 诊断计算 /
- 多涡结构 /
- 动力因子
Abstract: On the basis of hydrog raphic data obtained from 12 June to 6 July,1998, the three dimensional structure of circulation in the South China Sea (SCS) is computed by using three dimensional diagnostic model.The combination of sea surface height anomaly from altimeter data and numerical results provides a consistent circulation pattern for the SCS, and the main circulation features can be summ arized as follows: (1) In the northern SCS, there are a cycloniceddy C1 near Dongsha Islands and an anti-cycloniceddy W1 in the area west of Luzon Island.(2) In the central SCS, a strong eranti-cyclonic eddy W3 and a cyclonic eddy C3 compose a quasi-dipole in the area southeast of Vietnam.(3) A coastal northwardjet is present at the western boundary near the coast of Vietnam.This northward coastjet flows northward and turns eastward at the about 14°N, and then it flows southeast ward into the area between eddies W3 and C3.(4) In the sout hern SCS the current is weaker.(5) Most important dynamical mechanism is because of the joint effect of the baro clinity and relief.The second dynamical mechanism is because of the interaction between the wind stress and relief.(6) The distribution of the vertical component of current velocity is discussed.(7) Comparing of the circulation in 1998 with 2000, their change is not large.
- circulation in the SCS /
- SSHA /
- diagnostic calculation /
- multi-eddies structure /
- dynamic factors

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