摘要
采用引入差比关系法对南海TOPEX/Poseidon卫星高度计资料进行了潮汐分析;根据所得潮汐调和常数对卫星高度计测得的海面高度进行潮汐订正,进而得到南海各季节的海面高度距平。结果表明,南海冬、夏季季风强盛期海面高度距平位相相反,南海中部夏季为正距平,且有2个正距平中心;冬季为负距平,且有2个负距平中心。春、秋季是不同的季风过渡期,海面高度距平分布也明显不同:南海中部春季为正距平,且只有1个正距平中心;秋季为负距平,且只有1个负距平中心。研究表明,长周期分潮Sa和Ssa的叠加值可以很好地逼近南海海面高度距平。根据平均海面和海面高度距平得到了合成的海面高度和地转流场,发现南海表层地转流总体上是气旋式的;秋、冬季表层环流的西向强化十分明显,春、夏季较弱;冬季黑潮通过吕宋海峡进入南海北部,夏季基本上没有进入南海。
Tidal distribution in the South China Sea (SCS) is studied using TOPEX/Poseidon altimetry data. The sea surface height anomaly (SSHA), which is obtained after tidal correction based on the tidal results of this paper, is predominated by seasonal alternating monsoons. The results reveal that the SSHA in the central part of SCS is positive in spring and summer, but negative in autumn and winter. It is also found that the SSHA in SCS can be approached with the sum of tidal constituents Sa and Ssa. The monthly SSHA is obtained with this approach. The geostrophic circulations in SCS are calculated according to sea surface dynamic topography, which is the sum of SSHA and mean sea surface height. It is suggested that the geostrophic circulation in the upper layer of SCS is generally cyclonic and notably westernly intensified during autumn and winter, while the western intensification is weak during spring and summer. It is also indicated that the Kuroshio intrudes into the northeastern SCS through Luzon Strait in winter. But there is no indication of Kuroshio intruding into SCS in summer.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2002年第3期55-63,共9页
Journal of Tropical Oceanography
基金
国家海洋局青年基金资助项目(99306)
国家重点基础研究发展规划项目(G199943805)
