【作者】 方文东；

【导师】 方国洪；

【作者基本信息】 中国科学院海洋研究所 ， 物理海洋学， 2000， 博士

【摘要】 通过收集、整理了80年代以来南海南部及其邻近海区12个航次的水文观测资料，并辅以卫星遥感等其它资料，运用多源观测资料融合和动力计算等方法，对南海南部环流的结构及其季节变化进行系统的分析，给出了东北季风和西南季风稳定期上层（0—500m）和下层（500—1000m）环流的基本分布特征以及季风转变期环流的演变过程。揭示南海南部环流终年呈多涡结构特征，指出风应力涡度驱动和地形影响是南海南部上层环流的主要机制；首次提出了冬季南海南部逆风流和夏季海区西北部向东离岸流，并分别探讨其动力机制；首次对该海区开展海洋锋研究，指出夏季北部和冬季西南陆架坡折区具有两种不同类型的海洋锋；首次提出了春夏季季风转换期研究海区存在着盐度逆转的异常表层水，指出苏禄海高温高盐水的西向入侵、海面强的蒸发和表层海水弱的垂向混合是其主要的形成机制。更多还原

【Abstract】 In situ hydrographic data of 12 oceanographic cruises of the southern South China Sea (SSCS) since 1 980s, together with satellite remote sensing data, have been collected and processed. With these multi-source data sets and by using the dynamic calculation method, the structure and variation of the SSCS circulation are systematically analyzed. The basic distributing features of the upper (O-500m) and lower (500-l000m) circulation in the stable periods of the NE and SW monsoons and the evolution processes of the circulation during the monsoon transitions are studied. The features of the year-round multi-eddy structures are revealed and the forcing of wind stress curl and topographic effect are suggested to be the major mechanisms of the SSCS upper circulation. For the first time, the northward counter-wind current crossing the southern continental slope in winter and the eastward off-shore current at the northwest part of the SSCS in summer are proposed and their dynamic mechanism are discussed. The fronts in the SSCS are studied, showing that there exist two type of oceanic fronts梥ummer front at the north-part and winter front over southwest continental shelf-break. Salinity-reversing anomaly water was found for the first time at surface layer in the period of spring-to-summer transition. Several factors, such as the westward intrusion of the Sulu Sea high temperature and salinity water, the strong sea surface evaporation as well as the weak vertical mixing, are the major formation mechanism.更多还原