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基于 1 998年 6～ 7月南海调查航次的CTD资料 ,对南海环流采用最近发展的P矢量方法进行诊断计算 .计算结果 :黑潮向西入侵南海 ,然后做反气旋弯曲向东北方向流动 ,最终有通过巴士海峡流出南海的趋势 .在南海北部存在一个气旋性环流 ,这个环流的强度和范围随深度增加而减小 .该环流的冷中心位置随深度增加稍向南移 .南海中部、越南以东海域存在一个明显的气旋涡和反气旋涡 ,尤其在 2 0 0m及其以上水层均相当稳定 ,反气旋涡位于越南以东 ,其中心位置在 1 1°5 3′N ,1 1 1°5 0′E ,气旋涡的中心位置在 1 3°1 7′N ,1 1 2°5 5′E ,两者的尺度皆约为 2 5 0km .吕宋岛西侧存在一个反气旋涡 .在计算海区南部、巴拉望岛西南海域 ,1 0 0m以上层存在一个反气旋式涡 .从各层流场分布均可以显示海流在西部强化的现象 .
Based on the CTD data of the South China Sea survey voyage from June to July of 1998, the P-vector method of the South China Sea circulation is used to diagnose and calculate the circulation.The results show that the Kuroshio invaded the South China Sea to the west and then flowed in the anti-cyclonic bend to the northeast, There is a tendency of flowing out of the South China Sea through the Basque Strait. There is a cyclonic circulation in the northern part of the South China Sea, and the intensity and scope of this circulation decrease with increasing depth. The central position of the circulation decreases slightly with increasing depth. There is an obvious vortex and anticyclone vortex in the East China Sea, especially at 200 m and above. The anticyclone vortex is located to the east of Vietnam with its center located at 1 1 ° 5 3’N, 1 1 1 ° 5 0’E, the center of the vortex vortex is 13 ° 17’N and 1 1 2 ° 5 5’E, both of which are about 250 km in scale. There is an anti-cyclonic vortex on the west side of the island of Luzon In the southern part of the sea area, southwestern Palawan, there is an anticyclone vortex above 100 m, which shows the intensification of the ocean currents in the west from the distribution of flow fields at all levels.