摘要
通过分析 ＮＣＥＰ／ＮＣＡＲ多年再分析资料，清楚地揭露了南海夏季风爆发与索马里跨赤道南风气流建立之间的重要关系。对应南海夏季风爆发，总是已先期在赤道印度洋地区有西风加强和索马里跨赤道南风气流的建立；而且，若南海夏季风爆发偏早（晚），赤道印度洋地区西风的加强和索马里跨赤道南风气流的建立也偏早（晚）。可以认为，索马里跨赤道南风气流的稳定建立是南海夏季风爆发的重要物理机制之一，它的建立导致赤道印度洋地区西风的持续加强和向东扩展，并最终在南海地区形成西南气流。
Through analyses of NCEP/ NCAR reanalysis data, the important relationship between the onset of the summer monsoon in the South China Sea and the cross-equator southerly wind in the Somalia region is clearly shown. Corresponding to the outbreak of the South China Sea summer mon- soon, there are always an enhancement of the westerly wind over the equatorial Indian Ocean and an onset of cross-equator southerly wind in the Somalia region. If the outbreak of the South China Sea summer monsoon is earlier(later), the enhancement of westerly wind over the equatorial Indian Ocean and the onset of cross-equator southerly wind in the Somalia region are all earlier(later). It can be sug- gested that the steady onset of Somalian cross-equator southerly flow is one of important physical mechanisms to cause the outbreak of the South China Sea summer monsoon. The steady Somalian southerly wind will lead to an increase and eastward expanding of the westerly wind over the equatorial Indian Ocean, and then the southwesterly wind will occur over the South China Sea.
出处
《大气科学》
CSCD
北大核心
2002年第2期185-192,共8页
Chinese Journal of Atmospheric Sciences
基金
国家重点基础研究发展规划项目G1998040900
国家攀登项目"南海季风试验研究"
中国科学院KZ951-B1-408项目
