夏季南海对流活动对北半球中低纬大气环流的影响及其可能途径

THE INFLUENCE OF CONVECTIVE ACTIVITIES OVER SOUTH CHINA SEA ON THE NH MID-LOW LATITUDE ATMOSPHERE AND ITS POSSIBLE MECHANISM

关键词:  低频振荡  对流活动  南海

Key words:  Low-frequency oscillation  Convective activity  SouthChina Sea

摘要:

利用1984年夏季的ECMWF/WMO逐日资料及OLR资料,采用带通滤波方法,分析了南海对流活动对北半球中低纬大气环流的影响,结果表明,南海对流活动的低频变化对我国南方地区的大气环流有显着影响,南海对流活动首先影响印尼附近的上升支的强度,然后通过南北半球中低纬地区对而活动相互作用影响西太平洋副热带高压的强度和位置,从而影响我国南方的天气。

Abstract:

Using ECMWF/WMO daily data and OLR data for the summer of 1984, the influence of convective activities over South China Sea on the north hemisphere mid-low latitude atmosphere are studied through band-pass filtering. Results show that the influence of intraseasonal oscillation of convective activities over South China Sea on the atmosphere circulation over South of China's mainland is seen first in the strength of upward flow ncar Indianesia first, then in the position and strength of subtropical high in West Pacific and therefore influence synoptic condition of South of China's mainland.