东海海洋锋的波动及演变特征

本文利用近十年来获得的ＮＯＡＡ卫星红外影像，较为系统地分析了东海海洋锋（黑潮锋、对马暖流锋和浙江沿岸锋）的波动谱特征以及形态的演变。同时还利用浮标测流结果分析了锋面波动中的流态。分析结果表明：东海黑潮锋通常存在４～５个折叠波形，其波长平均约２００ｋｍ，波动随黑潮流向东北方向传播，速度约１６ｃｍ／ｓ。浙江沿岸锋的波动多呈锯齿形，其波长较短，波数多。在浙江沿岸锋波动发展过程中，其波长从开始的２０～４０ｋｍ发展成３０～６０ｋｍ，它们约以１８ｃｍ／ｓ的速度向东北方向传播。东海海洋锋波动演变形态复杂，其中黑潮锋的波动可能演变成锋面涡旋、暖丝和暖环。

Wavelike Features and Evolution of the Oceanic Fronts in the East China Sea

he wavelike characteristics and evolutionary fronts of the East China Sea (ECS),i.e.the Kuroshio front,the Tsushima warm current front and the Zhejiang coastal front,are analysed systematically in this paper by using the AVHRR thermal images of NOAA satellites.The variation of current at the frontal wave is analysed on the basis of the results of the mooring data. The results show that:The Kuroshio front shows there are 4-5 folding waves in the ECS with a mean wave length of about 200 km and they travel northeastward at a speed of about 16 cm/s with the Kuroshio.The Zhejiang coastal front shows sawtoothed waves.It has large wave number and small wave length. In the evolutionary process of the Zhejiang coastal frontal wave, the wave length increases from 20-40 km to 30-60 km.The waves travel northeastward with a speed of about 18 cm/s. The wavelike characteristics and evolutionary fronts are complex in the ECS.The wave from of the Kuroshio front may evolve into frontal eddy,warm filament and warm ring.