贵州夏旱成因初探

太阳黑子、大气环流和北太平洋海温是影响贵州夏季降水多少的三个重要因子。太阳黑子相对数特大年和特小年贵州一般无夏旱发生。贵州夏旱年多发生在太阳黑子中常期。西风带平均糟脊的强弱和位置的变化也与贵州夏季降水量息息相关。而北太平洋海温距平的分布形式直接影响到贵州夏季的旱涝。当北太平洋海温距平分布为北负南正时，贵州多夏旱。当北太平洋海温距平分布为北正南负时，贵州夏旱少有发生。

STUDY ABOUT THE FACTORS OF GUIZHOU SUMMER DROUGHT

Sunsport,atmespheric circulation and North pacific sea-surface temperature are three important factors which influence the summer precipitation in Guizhou.There is no summer drought if the relative sunsport numbers is very large or very small.It is also found that the position and intensity of mean trough and ridge of westerly belt have some effect on summer precipitation by analysing geopotencial height fields of the same period of summor drought and summer flood years.