1958—2007年吉林省降水量的时空分布特征

利用吉林省21个气象站1958—2007的逐日降水资料,采用EOF、REOF、小波分析等方法,研究了近50年来吉林省降水资源的异常空间结构及时间演变规律.结果表明:吉林省年降水异常在空间上主要表现为整体一致的变化特点,同时还存在南北和东西的较大差异;旋转载荷向量场反映出4个降水异常区,即:南部山区、东部山区、西部平原区和中部地区;各分区在10a的周期上表现一致,4a左右的振荡周期最强,且吉林南部山区和东部山区年际降水变幅较小,西部平原区年际降水变幅较大.

Temporal-spatial distribution of precipitation over Jilin Province during 1958-2007

Using 1958-2007 day-by-day precipitation data over 21 stations in Jilin Province,temporal and spatial variability features are studied by applying the methods of EOF,REOF and wavelet analysis.The results show the annual precipitation distribution exhibits common features as well as spatial differences,which can be classified into four types as southern mountain region,eastern mountain region,western plain region and central part of Jilin.The periods of each region,which is below 10 years,all appear four years powerfully,and the amplitude of precipitation is smaller in southern mountain region and eastern mountain region than that in western plain region.