东海高密水环流的演变及其对长江口外混合水扩散的影响  

The evolution of the East China Sea dense water circulation and its influence on the mixing water diffusing off Changjiang mouth

作　　者：潘玉球[1] 梁湘三[1] 黄树生[1] 

机构地区：[1]国家海洋局第二海洋研究所

出　　处：《东海海洋》1997年第2期15-24,共10页Donghai Marine Science

基　　金：国家自然科学基金;国家海洋局海洋科技发展基金

摘　　要：本文依据多年的东海水文观测资料，进一步分析了东海高密水核心及其上层环流的形成、演变特点和它对长江口外混合水扩散的影响。获得如下结果：１．东海高密水的形成是具有高温、高盐特性的台湾暖流水北上降温的必然结果。增密方程可以反映这一特点。２．东海高密水核心及其上层环流的形成与由台湾暖流发展引起的水团挤压有关。３．在春、夏季，东海高密水核心区上层环流的发展可对长江口外混合水（盐度为２３～３３）的扩散产生很大影响。这个环流可导致近岸盐度锋松弛，长江口外混合水沿具有低密特性的台湾暖流水和东海高密水之间的密度锋向外扩展。The features of the formation and evolution of the East China Sea dense water circulation and its influence on the diffusion of the mixing water off Changjiang mouth are analyzed on the basis of the hydrographic data in 1980￣1991. The results are as follows: 1.The formation of the East China Sea dense water results from the temperature decrease and the density increase of the Taiwan warm current water with high temperature and salinity while it moves northwards in autumn and winter. The equation of increasing density can be applied to explain this feature. 2.The formation of the dense water core and its upper circulation is associated with water masses inter squeezing caused by the development of the Taiwan warm current in spring and summer. 3.The development of the upper circulation on the East China Sea dense water core area can influence the diffusion of the mixing water off Changjiang mouth. Its effects are to induce the inshore salinity front frontolysis and to induce the mixing water off Changjiang mouth diffusing to offshore along density front between the low density Taiwan warm current water and the East China Sea dense water. The density front is a diffusion channel of the mixing water off Changjiang mouth.

关 键 词：东海 高密水 环流 长江口 混合水 

分 类 号：P731.1[天文地球—海洋科学]