Based on monthly mean air temperature and monthly precipitation data from nine meteorological stations in Huolin River basin from 1951 to 2010, using climatic linear trend, Mann-Kendall test and correlation analysis methods, the spatial-temporal characteristics of climatic change in this region were analyzed in this paper. The results indicated that the annual temperature had increased 2.3 ℃, with an increasing rate of 0.38 ℃·(10a)-1 showing an up ward trendin general from 1951 to 2010 in the basin.The increase of temperature in spring was most obvious,with a changing rate of 0.50 ℃ ·(10a)-1.The annual mean temperature had an abrupt change mainly in 1986,and the temperature averaged from 1987 to 2010 was more than 1.3 ℃ higher than that from 1951 to 1986.There were significant cyclical changes with 6~8 and 15 aperiod. Annual precipitation had fallen 83.9 mm,with a decreasing rate of 13.98 mm·(10a)-1 and a downward trend in general from 1951 to 2010.The decrease of precipitation was most pronounced in summer,with adecrea singrate of 11.41 mm·(10a)-1.Annual precipitation abrupt was mainly observed in 1998, and the precipitation averaged from 1998 to 2010 was 76 mm less than that from 1951 to 1997. There were significant cyclical changes with 4 years and 8~9 years periods. It is found that the change in temperature has positive correlation with AO index and the change in precipitation negatively correlates with EAP index.
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.