Analysis of Time-spatial Characteristics of Summer Precipition in Chongqing Region During 45 a

Using 1966 similar to 2010 year Jun.similar to Aug. precipitation data over 34 stations of Chongqing region, the temporal and spatial variability features were studied by applying the methods of EOF, REOF, Morlet wavelet analysis. The results indicate that the summer precipitation spatial differences are great. The summer precipitation distribution exhibits the common features as well as the spatial differences, which can be classified into four types as Northeast, Northwest, Southeast and Southwest Chongqing. The inter-annual variation characteristic in the four types is not correspondent. Northeast and Southwest ones are like a parabolic curve which have a maximum value and Southwest and Northwest ones exist upward tendency. The periods of the four types are not unanimous.