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