中文摘要：

利用高时空分辨率的资料，对东海黑潮表层海流的半年内时间尺度变化特征进行了分析研究，得到主要以下结论：（1）东海黑潮表层海流在台湾东北海区和吐噶喇海峡附近海区存在着最为显著的变化；（2）那里的表层海流都存在半年内时间尺度的变化，其谱峰主要在50～70d及90～140d两个频段内，两个准周期变化的基本特征都是异常气旋涡和反气旋涡的准周期转换；（3）异常气旋涡和反气旋涡的活动都与东海黑潮在两个海区的流轴变化相联系，气旋涡与黑潮流轴在该海区的向东南退缩相伴，而反气旋涡与黑潮流轴在该海区的向西北推进相伴；（4）初步分析表明，在台湾东北海域导致50～70d变化的异常涡旋主要源于黑潮自身存在的中尺度过程，而90～140d的变化则主要受从台湾以东传来的中尺度涡影响。类似地，吐噶喇海峡附近的黑潮海流同样在50～70d及90～140d两个频段内存在显著的准周期变化，回归分析表明，导致50～70d变化主要源于上游黑潮海流的中尺度过程，而90～140d的变化则主要受琉球群岛以东传来的中尺度涡影响。

英文摘要：

Using high resolution data, the surface current variation within half-year time scale in active region of the Kuroshio in East China Sea is studied in this paper. The major results are as follows： （1） The northeast Taiwan area and near Tokara Strait region are two regions with the most remarkable variation of the surface current of Kuroshio in East China Sea （ECS）. （2） There are the surface current variations within half-year time scale in two regions,the quasi-periodic transformation between anomalous cyclonic vortex and anomalous anticyclonic vortex is basic feature of the surface current variation. The spectrum peaks of the quasi-periodic transformation are mainly at 50 to 70 days and 90 to 140 days. （3）The actions of anomalous cyclonic vortex and anomalous anticyclonic vortex are closely related to the current axle variations of the Kuroshio in East China Sea, the action of anomalous cyclonic vortex （anticyclonic vortex） is accompanied with the flinching to southeast （the pushing on northwestwards） of the Kuroshio current axle. （4） In northeast of Taiwan area, the 50 to 70 days oscillation of the Kuroshio in East China Sea is mainly originated from the Kuroshio mesoscale fluctuation; the 90 to 140 days oscillation is mainly influenced by the mesoscale eddies from east of Taiwan. Analogously, the 50 to 70 clays oscillation of the Kuroshio in East China Sea is mainly originated from the Kuroshio mesoscale fluctuation at upper reaches of the Kuroshio; the 90 to 140 days oscillation is mainly influenced by the mesoscale eddies from east of the Pyukyu gunto.