2000年夏季南海环流的改进逆方法计算

袁耀初; 刘勇刚; 楼如云; 苏纪兰; 王康墡

2000年夏季南海环流的改进逆方法计算

1.
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
2.
College of Marine Science, University of South Florida, U.S.A

基金项目: 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: 2003-05-04
- 修回日期: 2003-07-10

Calculation of circulation in the South China Sea during the summer of 2000 by the modified inverse method

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of OceanDynamic Processes and Satellite Oceanography of State Oceaceanic Administration, Hangzhou 310012, China;
2.
College of Marine Science, University of South Florida, U.S.A.

摘要

摘要: 基于2000年8月航次在南海调查资料,采用改进逆方法,并结合TOPEX/ERS分析的SSH分布,获得以下的主要结果:(1)南海中部和西南部环流系统主要受反气旋环流所支配.主要有越南东南反气旋涡W₁,其水平尺度约为300km,垂向深度可达1000m以深,流速很强,其最大流速为79cm/s左右,还有暖涡W₂以及吕宋岛西南反气旋涡环流系统W₃.其次,在反气旋涡W₁与W₂之间还存在气旋式涡C₁.其水平尺度比暖涡W₁小得多,流速也较强.两涡W₁与C₁之间存在一支南向流,它们组成一个准偶极子.(2)在暖涡W₁的西侧存在西边界流,即北向射流,其流速很强,约在12°N流向转向东北.(3)南海北部环流系统主要受气旋环流所支配.在断面N2附近及以北存在一个气旋式环流系统.其次,在海南岛东南存在一个尺度不大的反气旋环流系统.(4)南海东南部环流系统主要受气旋环流所支配.主要有在巴拉望岛以西存在尺度较大的气旋环流系统,以及暖涡W₁东南存在一个气旋环流系统.其次,在加里曼丹岛西北还存在范围不大的反气旋环流.(5)比较1998年夏季航次与2000年夏季航次时计算结果,虽然它们在定量上有些变化与差别,但在定性上它们的环流结构有十分相似之处.这表明,南海环流具有明显的季节特性.(6)比较2000年夏季南海水文结构,流函数分布以及TOPEX/ERS的SSH分布,它们在定性上十分吻合.
- 夏季南海环流 /
- 南海环流的季节特性 /
- 多涡结构 /
- 改进逆方法
Abstract: On the basis of hydrographic data obtained in August 2000 cruise,the circulation in the South China Sea (SCS)is computed by using the modified inverse method in combination with SSH data from TOPEX/ER S-2 Analysis.The following results have been obtained.(1)The central and southw estern SCSs are dominated mainly by anticyclonic circulation systems.They are mainly as follows.1)There is strong anticyclonic eddy southeast of Vietnam(W₁).Its horizontal scale is about 300 km,and it extends vertically from the surface to the 1 000 m more than.It is very strong with a V_max of about 79 cm/s;2)there are a warm eddy W₂ and the anticyclonic circulation system W₃ west off the Philippines.In the next place,there is a stronger cyclonic eddy C₁ between the anticy clonic eddies W₁ and W₂,and it is also strong.A southward flow exists between the eddies W₁ and C₁.The eddies W₁ and C₁ compose a quasi-dipole.(2)A strong coastal jet is present at the western boundary west of an anticy clonic eddy W₁,and the jet flows northward and separates from the coast of Vietnam at about 12°N to the northeast.
- SCS circulation in summer of 2000 /
- obvious seasonal feature /
- multi-eddies structure /
- modified inverse method

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