摘要
利用１９８２～１９９６年１５年平均的ＮＣＥＰ再分析资料，研究南海夏季风爆发前后低纬大气环流的突变特征。结果表明，东南亚地区对流层中上层厚度（温度）场、高低风场和大气层顶净辐射加热率（ＱＲＴ）都有突变发生。海温场的变化相对其他要素较为缓慢，但也存在明显的转折点。ＱＲＴ突变最早，其次是海温场变化出现明显转折，再是厚度（温度）场、低层风场突变，高层风场的突变最迟；低层风场突变最快，其次是厚度（温度）场，最后是 ＱＲＴ和高层风场。南海地区的降水，水汽场的突变发生在南海夏季风爆发前，而且突变较快。
The abrupt change of the general circulation over the South China Sea (SCS) and sur- rounding areas during the period from April to June is studied by using the 15-year mean NCEP daily data of 1982-1996. The significant abrupt change exits in the thickness (averaged temperature) between 500 and 200 hPa levels, the wind at 850 and 200 hPa, and the net radiative heating (QRT) at the top of the atmosphere. The sea surface temperature (SST) evolves more slowly than other variables mentioned above but with a turning point around early May. The abrupt changes in QRT occur around mid-April and at the end of April. Around mid-May occur the abrupt changes simultaneously in the thickness of 500-200 hPa and the wind field at 850 hPa, then followed by the high-level wind. The abrupt changes in the precipitation and the specific humidity over SCS come quite fast and early before the onset of the SCS monsoon.
出处
《气候与环境研究》
CSCD
2000年第4期356-362,共7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
