台湾东北海域冷涡及其变异的遥感信息研究——Ⅰ.冷涡的季节性变化

Study on the Information of Remote Sensing for Cold Eddies and Its Variations in the Sea Area Northeast of Taiwan——I. The Seasonal Variations of the Cold Eddies

利用NOAA卫星AVHRR传感器反演的MCSST图像 ,分析了台湾东北海域冷涡的季节变化。结果表明 :( 1 )台湾东北海域冷涡终年存在 ,出现在彭佳屿附近海域、台湾岛北部沿岸海域和东岸北部沿岸海域 3处 ,夏、秋季有 3涡或双涡并存现象。 ( 2 )彭佳屿附近海域冷涡 ,最早出现于 3月底 ,最迟发生于 1 1月中 ,冬季消失 ,表层形态、尺度、位置和强度有明显的季节性变化。 ( 3)冷涡的季节性变化可能与黑潮锋面弯曲的摆动和台湾海峡水入侵东海陆架间的动力平衡有关。

Based on MCSST images from NOAA satellites, the seasonal variations of the cold eddies in the sea area northeast of Taiwan are analysed. It is shown from the analysis results that (1) the cold eddies existed all the year round, apeared in the Pengjiayu sea area, the coastal waters north of Taiwan and coastal waters northeast of Taiwan, and there were 3 or 2 eddies in summer and autumn; (2) the cold eddies in the Pengjiayu sea area began in late March, died out in middle November, and had obvious seasonal variations; (3) the seasonal variations of the cold eddies may be related to the dynamic balance between the swing of the Kuroshio frontal meander and the Taiwan Strait water intruding into the East China Sea continental shelf.