关键词: 降水, 时空演变, Mann-Kendall, Morlet, 吉林省

Abstract: Based on annual precipitation data of 38 meteorological stations in Jilin province and the vicinity area,spatial-temporal characteristics of precipitation over Jilin province during 1960-2008 was analyzed by using deviation coefficient,climate inclination rate,REOF analysis,Morlet wavelet analysis and Mann-Kendall mutation test method.The results showed that multi-annual average precipitation in Jilin province was 300~950mm,with a spatial decreasing tendency from southeast to northeast and central-western.Precipitation decreased during the last 50 years more than 90% area of Jilin province,except for in Wangqing,Luozihe,Jingyu,Huadian stations.Based on REOF analysis,spatial structure of precipitation in Jilin province was divided into 4 highly correlated anomaly regions i.e.the southeast,the western,the northeast and the central region.4 typical stations such as Tonghua,Tongyu,Luozihe and Jiaohe showed obvious periodic oscillations,and the first primary periodic for each station was 9,23,25 and 19 years.Mutation analysis derived from Mann-Kendall test indicated that Tonghua and Tongyu station had significant mutation points in 1975 and 1998 respectively,and both the two mutation points were demarcation points between humid period and drought period,while Luozihe and Jiaohe showed no mutation point during last 50 years.

Key words: Precipitation, Precipitation, Spatial-temporal change, Mann-Kendall, Morlet, Jilin province