1998年冬季南海环流的三维结构

廖光洪; 袁耀初; 徐晓华

1998年冬季南海环流的三维结构

国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012;国家海洋局, 海洋动力过程和卫星海洋学重点实验室, 浙江, 杭州, 310012

基金项目: 国家基础研究发展规划项目(G1999043805);国家自然科学基金项目(40306030)

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出版历程
- 收稿日期: 2004-07-15
- 修回日期: 2004-11-20

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

Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 利用1998年11月28日至12月27日南海的调查资料,采用三维海流诊断模式,计算了冬季南海三维海流,所得结果如下:(1)冬季南海环流系统方面:1)南海北部,在吕宋西北海域分别存在一个气旋式、反气旋式涡.2)南海中部,在越南近岸存在较强的、南向的西边界射流.其以东海域出现较强的气旋式环流.南海中部东侧海域存在一个较弱的反气旋式环流.3)南海南部,一般流速较弱.在112°E以西受反气旋式环流所控制,加里曼丹岛西北海域存在气旋性环流.由于受调查海域所限,这两个环流只部分出现.(2)上述环流系统与200 m层水平温度、密度分布对应较好.(3)南海冬季环流垂向速度分布方面:1)表层,南海北部,在吕宋西北为范围较大的上升流海区.而在东沙群岛附近海域出现了下降流.海南岛以南及东南海域也存在下降流.南海中部,越南以东海域出现范围较大的下降流,其以东为上升流海域,而在巴拉望岛西北海域又出现下降流.南海南部,基本上被上升流海域所控制.2)次表层与表层不同,例如在次表层,海南岛东南部海域出现上升流.中层和深层垂向速度分布与次表层相似.(4)关于南海垂向速度分量分布的动力原因:在表层,风应力旋度场起着主要作用;在次表层,β效应与斜压场相互作用是重要的动力因子,而风应力旋度场和β效应与正压场相互作用也有一定影响;在南海中部等区域的中层以及在南海的深层,主要受B效应与斜压场相互作用和B效应与正压场相互作用的共同作用.
- 南海环流 /
- 诊断模式 /
- 三维环流结构 /
- 上升流和下降流
Abstract: On the basis of hydrographic data obtained in December,1998 cruise,the three dimensional structure of circulation in the South China Sea(SCS)is computed by using three dimensional diagnostic model.The following computed results have been obtained.(1)On the circulation systems in the SCS during the winter of 1998,it is found that:1)In the northern SCS,there is a cold and cyclonic eddy northwest of Luzon,and there is an anticy clonic eddy near the Dongsha Islands;2)in the central SCS,a coastal southward jet is present at the western boundary near the coast of Vietnam;there is a stronger cyclonic circulation east of Vietnam,and there is a weaker ant icyclonic circulation east of this cyclonic circulation; 3)in the southern SCS,there is an anticyclonic circulation in the area west of 112°E,and there is a cyclonic circulation northwest of Borneo Island.
- SCS circulation /
- diagnostic model /
- three dimensional circulation structure /
- upwelling and downwelling

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