水团相互作用与东海高密水环流的演变

Interaction between water masses and the evolution of the East China Sea dense water circulation

本文利用水文和海流观测资料，从水团相互作用去研究东海高密水及其环流的演变。获得如下一些结果：东海高密水冬季形成于东海中部陆架混合水中，入春以后水团挤压，高密水显得更为突出，入秋后高密水变性，东海中部陆架混合水重新形成；东海高密水核心区可形成气旋环流，从冬到秋经历了一个弱—强—弱的演变过程。海流观测结果证实这个环流是存在的；在东海高密水南侧存在较明显的密度锋，从冬到秋它也经历了一个弱—强—弱的演变过程；水团分析发现，各种与主体分离的混合水从春到夏可在高密水核心周围组合成一个环。

In view of the interaction between water masses, the evolution features of East China Sea dense water and its circulation are analyzed. The results are as follows: In winter, the East China Sea dense water forms in the mixing water of the East China Sea middle shelf. After spring, the dense water becomes rather outstanding due to the squeeze between water masses. With the advent of autumn, the dense water modifies its characteristics and the mixing water forms again on the East China Sea middle shelf. The cyclonic circulation forms on the core area of the dense water. It experiences a weak strong weak cyclic process from winter to autumn. Observation results of sea current conform that it does exist on the core area. There is a density front in the south side of the dense water. The front also experiences a weak strong weak evolution process from winter to autumn. Based on the analysis of water masses, every mixing water bodies, which are separated from the main water mass, can make up a circle from spring to summer around the core area. So, the existence of the dense water circulation also be testified further.