高原夏季风与南海夏季风关系及其影响

利用1983-2012年NCEP/NCAR、NCEP/DOE、ECMWF再分析月平均资料,及中国160站月平均气温和降水量资料,利用统计学方法从大气环流、降水及温度等方面对高原夏季风与南海夏季风的关系进行了探讨。结果表明:高原夏季风与南海夏季风呈负相关关系,且大气环流及对流活动存在显著性差异。高原夏季风偏强(弱)同时南海夏季风偏弱(强)时,同期中国大部分地区的500hPa高度场偏低(高),南海地区500hPa高度场偏高(低);欧亚大陆低纬地区大部为偏东(西)风,南海地区处于反气旋(气旋)环流中。青藏高原主体地区上升运动较弱(强),南海中心区域上升运动均较弱(强),长江中下游地区降水增加(减少),华南降水减少(增加)。中国大部分地区气温较低(高),华南地区气温较高(低)。

Relationship and influence of summer monsoons over the Tibetan Plateau and the South China Sea

By using NCEP/NCAR,NCEP/DOE and ECMWF reanalysis monthly data and monthly average temperature, precipitation observation data from 160 stations during 1983-2012, and with statistical methods, the relationship of summer monsoon between the Tibetan Plateau(TP) and the South China Sea(SCS) is investigated from the aspects of atmospheric circulation, precipitation and temperature. Results show that the summer monsoon over TP has negative correlation with that over SCS, moreover, a significant difference exists in atmospheric circulation and convection activity. When the summer monsoon over TP is strong(weak) while weak(strong) over SCS, the 500 hPa height is low(high) in most regions of China but high(low) in SCS region;most Eurasia areas at low latitude prevail east(west) wind, and the SCS region is in anticyclonic(cyclonic) circulation;weak(strong) upward movement exists in the main body of the TP region, while weak(strong) upward movement exists in the center of the SCS region;precipitation increases(decreases) at the middle and lower reaches of the Yangtze river region while decreases(increases) in South China;the temperature is low(high) in most regions of China while high(low) in South China.