东海西北部中层冷水的成因  

Formation Cause of the Intermediate Cold Water in the Northwestern East China Sea

作　　者：王宗山[1] 徐伯昌[1] 邹娥梅[1] 廖启煜[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海洋科学进展》2002年第3期68-72,共5页Advances in Marine Science

基　　金：国家自然科学基金资助项目--黄东海中层冷水形成机理的研究(48976005)

摘　　要：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 historical temperature, salinity and density data in the area west of 124°E and between 28°N and 30.5°N during April to June of 1959 to 1996, the disposition relations between the characteristic depth of intermediate cold water(ICW), halocline and pycnocline are analyzed, and the relationship between the formation and development of ICM and the bottom salt content is also discussed. It is pointed out that ICW occurs in the pycnocline and superimposes on the pycnocline due to the buoyancy effect of Taiwan Warm Current water with high density. In spring, the sea surface heat content increases with increasing bottom salt content to strengthen the pycnocline, which is a main factor for maintaining ICW. It is shown from 3D current field modeling results and the correlation analysis of ICW core temperature and sea surface temperature in winter that ICW in the study area is generated by the cooling convection of local winter surface water and the sinking and stretching eastward of Zhemin coastal water in winter.

关 键 词：东海 成因 中层冷水 数值模拟 深度 盐度 密度 温度 

分 类 号：P731.1[天文地球—海洋科学]