P矢量方法在南海夏季环流诊断计算中的应用
Application of P vector method to the diagnostic calculation of circulation in the South China Sea in summer
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摘要: 基于1998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200m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11°53'N,111°50'E,气旋涡的中心位置在13°17'N,112°55'E,两者的尺度皆约为250km.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,100m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.Abstract: The P vector method is used to compute diagnostically the circulation of the South China Sea(SCS)in summer,based on the hydrographic data obtained during the SCScruise in June to July,1998.The results show that:The Kuroshio intrudes into the SCS,and then it makes a cyclonic meander to the northeast,and it finally has the trend of flowing out the SCS through the Bashi Channel.There is a cyclonic circulation in the northern part of the SCS,and its strength and scope decrease with the depth increases.There is a cold centre in this cyclonic circulation,and its position moves slightly the south with the depth increases.There are two obvious cyclonic and anticyclonic gyres in the central part of the SCS,and their scales are both about 250 km and they are quite stable above the 200 m level.The anticyclonic gyre lies to the east of Vietnam,and its centre is at 11°53'N,111°50'E.The centre of cyclonic gyre is at 13°17'N,112°55'E.There is an anticyclonic gyre west of Luzon Island.There is an anticyclonic gyre above 100 m level east of Balawan Island in the southern part of the SCS,but it becomes a cyclonic gyre at the levels below 200 m,and its current is quite weak.There is the intensify of curent in the western part of the SCS.
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