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使用1958—2001年SODA温度场资料,较为系统地对东海冷涡附近海域具代表性剖面温度场进行逐月分析,对冷涡中心提取方法进行了总结完善。结果表明,35 m深处冷涡44年的平均中心位于(32.0°N,125.7°E);冷涡的中心位置存在较显著的季节性变化:经向变化方面,由夏季、秋季至冬季,冷涡中心位置自北向南逐渐移动;从冬季、春季至夏季自南向北移动。纬向变化方面,冬季冷涡中心明显偏西,其他季节冷涡中心偏东且中心经度变化不大。以上变化主要是由冷涡周边流场的季节性变化引起的。冷涡中心在冬末春初和秋初表现不明显,这应是由环流场季节性转换导致。
Using the temperature field data of SODA from 1958 to 2001, the representative sections of the sea temperature near the cold vortex in the East China Sea are systematically analyzed month by month, and the extraction methods of cold vortex centers are summarized and improved. The results show that the average center of cold vortex at 35 m is located at (32.0 ° N, 125.7 ° E). There is a significant seasonal change in the center of the cold vortex. From the aspects of meridional changes, from summer to autumn, The position gradually moves from north to south; from south to north from winter, spring to summer. In terms of zonal changes, the winter cold vortex center is obviously westward, while the cold vortex center is eastward and the central longitude does not change much in other seasons. The above changes are mainly caused by the seasonal changes of the flow field around the cold vortex. Cold vortex centers did not show much in early winter and early autumn, which should be caused by the seasonal change of circulation field.