1998年1～8月南海及邻近海区海况模拟

NUMERJCAL SIMULATIONS OF OCEANIC ELEMENTS IN THE SCS AND ITS NEIGHBORING SEA REGIONS FROM JANUARY TO AUGUST IN 1998

关键词:  区域海洋模式  海流  夏季风

Key words:  regional ocean model  ocean current  summer monsoon

摘要:

使用改进的美国普林斯顿大学区域海洋环流模式(POM)对南海及邻近海区1998年1～8月海况进行了数值模拟,所得的主要结果与海洋观测及已有的一些研究结果基本一致。模拟结果表明:1～8月,黑潮南海分支是南海北部的一支重要海流;除冬季月份外,南海暖流都清晰可见:黑潮右侧的大尺度反气旋性暖涡1～8月都存在。在所模拟的海区中,南海海区表层海流与季风关系最密切,季节变化最明显。另外,改进的POM能较好地再现1998年西南季风爆发前后,南海及邻近海区表层海温的演变特征。这为以后发展区域海气耦合模式奠定了基础。

Abstract:

The oceanic elements in the South China Sea(SCS) and its neighboring sea regions in January~August 1998 have been simulated by using the improved Princeton University Ocean Model(POM) in this paper. The main results are in good agreement with that of ocean investigations and other simulations. The results show that: the SCS branch of the Kuroshio Current is an important part in the north SCS from Jan. to Aug,the SCS Warm Current is reproduced clearly in all months except in winter months, there always exists a large-scale anticyclonic vortex on the right of the Kuroshio Current from January to August. In the model domain, the surface currents of the SCS have the closest relations with the monsoon with an apparent seasonal variation. In addition, the developing characteristics of the SST in the SCS and its neighboring sea regions before and after the summer monsoon onset are also well simulated by the improved POM. Those are the foundation for developing a coupled regional ocean-atmospheric model system.