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根据1959—1996年4—6月存在中层冷水的28°～30.5°N,124°E以西海域的温、盐、密度资料,对中层冷水的特征,深度与盐、密度跃层的配置及中层冷水的存在和发展与表层热含量和底层盐含量间的关系进行了分析。指出:中层冷水是存在于密跃层之中,高密度(台湾暖流)水的浮力效应使其叠置于它的上方;在春季,表层热含量和表征台湾暖流的底层盐含量的同步提加,提高了密度跃层的强度,是中层冷水得以维持的重要因素。中层冷水核心的温度与其对应冬季表层温度间的相关分析及三维流场的数值模拟结果揭示,研究海区中层冷水的来源为:(1)当地冬季表层水(南下黄海表层水与东海表层水的混合水)冷却对流;(2)几种水组成的浙闽沿岸水于冬季下沉和向东伸展。
Based on the data of temperature, salinity and density from 28 ℃ to 30.5◦N and 124◦E in the middle-level cold water from April 19 to June 1959, the characteristics of middle-level cold water, the configuration of depth and salt and density thermocline, The relationship between the existence and development of cold water and the surface layer heat content and the underlying salt content was analyzed. It is pointed out that the middle layer of cold water exists in the thermocline and the buoyancy effect of high density (Taiwan warm current) water superimposes it on top of it. In spring, the surface layer heat content and the synchronous increase of the underlying salt content , Increasing the intensity of the density thermocline is an important factor for maintaining the cold water in the middle layer. The correlation analysis between the core water temperature and its corresponding winter surface temperature and the numerical simulation of three-dimensional flow field reveal that the source of the cold water in the middle reaches of the sea area is as follows: (1) The local surface water in winter (the mixing of the surface water in the lower Yellow Sea and the surface water in the East China Sea Water) cooling convection; (2) Zhejiang and Fujian coastal waters composed of several kinds of water sink and eastward in winter.