沿岸海区冬季垂直环流及其温盐结构的数值研究──Ⅱ.温盐结构

冬季沿岸海区温度和盐度的数值计算结果表明：温度在近岸近表层大致呈垂直均匀分布，外海近表层形成较强的温跃层，近岸至外海的下层保持冷水特征。表层和底层盐度高，中层盐度低，在中层形成自近岸伸向外海且盐度逐渐由低变高的低盐水舌，河口冲淡水区形成较强的盐跃层。随着自南往北海区水深的逐渐变浅、岸界坡度的由大变小和沿岸下降流的由强变弱，近岸温度和盐度的垂直分布越来越均匀，外海近表层的温跃层强度越来越弱。盐度自南至河口区逐渐由高变低，而自河口区至北逐渐由低变高。沿岸下降流使河流冲淡水区的益跃层变厚。

NUMERICAL STUDY ON VERTICAL CIRCULATION AND T-S STRUCTURES IN COASTAL SEA AREA DURING WINTER TIME II. THE STRUCTURES OF THE TEMPERATURE AND SALINITY

This study's computional results show that the temperature distribution in the nearshorearea is almost uniform venically, that a strong thermocline layer forms in the near surface layer ofthe outside sea; and that the bottom layer water throughout the sea is charasterised by lowtemperature. The salinity is high in the surface and bottom layers, and low in the mid-layer. A lowsalinity water tongue forms at the nearshore area and spreads to the outside sea. A strong haloclineforms in the low salinity wator area at the mouth of the river. For the whole coastal sea area, thevenical distributions of temperature and salinity become more edform in the nearshore area withdecreasing of water depth and continental slope and weakening of coastal downwelling from thesouth to the north. The thermocline intensity becomes weaker in the nearsurface layer of the outsidesea. Salinity decreases from the south to the mouth of the rivet, and increases from the mouth ofthe river to the north. The distribution characteristics of the temperature and salinity are attributedmainly to the countor-elockwise flow of the vertical cireulation in the coastal area during wintertime.The coastal downwelling thickens the halocline in the low salinity water area of the river