摘要
通过３个数值实验和对１９９８年及１９９６年南海夏季风爆发的对比分析以及多年资料统计研究发现，南海夏季风何时爆发与南海局部地区的海温高低和南海经度上南北海温差异的大小关系不密切，主要决定于南海及其周围大范围地区的环流形势。南海季风爆发前１０天内，其环流特征是低层 ８５０ ｈＰａ上，西太平洋副热带高压脊经菲律宾西伸控制南海，南亚至东南亚为宽广的低槽区所控制，高空 ２００ ｈＰａ上，南亚高压位于阿拉伯海至南海一带，中心位于孟加拉湾东侧和中南半岛西侧的低纬地区，广大北方为西风气流所控制。
In the context of 3 numerical experiments and the comparison of SCS summer monsoon onset in 1998 and 1996 as well as secular statistical data, results show that the onset time mainly depends on the circulation feature around SCS rather than the SST and its meridional gradient in SCS. In the last 10 days before the SCS summer monsoon onset, the circulation feature over 850 hPa level pres- ented that the subtropical ridge is in west Pacific ocean and extends westward from the Pacific Ocean through the Philippines to SCS. There are a wide low trough from the Arabian Sea to Indo-China. The south Asia high over 200 hPa level was located at the Arabian Sea and SCS and its center was locates at the low latitude of the Bay of Bengal east side and Indo-China west side. The northern region was control of west wind.
出处
《气候与环境研究》
CSCD
2000年第4期495-506,共12页
Climatic and Environmental Research
基金
国家科技部攀登项目A"南海季风试验研究"资助
