Spatial-Temporal Variation Characteristics of Summer Precipitation in Sichuan, 1961-2007
Based on the precipitation data of 119 stations from 1961 to 2010,the temporal and spatial variations of summer precipitation in Sichuan were analyzed by using the EOF,REOF linear trend,Mann-Kendall analysis and Morlet wavelet analysis.The analyzed results are as follows:The summer precipitation presents a downward tendency during the 47 years.Abrupt changes appeared in 1962,1982 and 2000,respectively.There were changing periods of 22 and 6-8 years.Spatially,the summer precipitation in Sichuan can be subdivided into the following four regions:east Sichuan basin,mid-west Sichuan basin,southwest Sichuan mountain region and western Sichuan plateau.Summer precipitation was increasing in east Sichuan basin and western Sichuan plateau,was decreasing in mid-west Sichuan basin and more stationary,perhaps with a little increasing,in southwest Sichuan mountain region.In the four regions,there were unique annual and decadal variations in summer precipitation,with changing periods of 23,16,14,12,8 and 6 years.
NETL
NSTL
万方数据
维普
