1961-2007年四川夏季降水的时空变化特征  

Spatial-Temporal Variation Characteristics of Summer Precipitation in Sichuan,1961-2007

作　　者：赵旋[1] 李耀辉[2] 齐冬梅[1] 

机构地区：[1]中国气象局成都高原气象研究所,四川成都610072 [2]中国气象局兰州干旱气象研究所,甘肃兰州730020

出　　处：《冰川冻土》2013年第4期959-967,共9页Journal of Glaciology and Geocryology

基　　金：公益性行业(气象)科研专项(GYHY201006023)资助

摘　　要：基于1961-2007年四川地区119测站逐日降水资料,利用EOF、REOF分析、趋势分析、MK突变检验以及Morlet小波分析等方法,研究了四川地区夏季降水的变化趋势、空间分布特征以及时间变化规律.结果表明:近47a来四川夏季降水呈减少趋势,在1962、1982年和21世纪初发生突变,存在22a和6～8a的周期.四川夏季降水可分为4个区域:一区(盆地东部)和四区(川西高原)夏季降水量长期变化呈增多趋势,二区(盆地中西部)长期变化呈减少趋势,三区(川西南山)变化趋势较为稳定,呈小幅度增多趋势.4个区域的夏季降水周期各有特点,最长存在的周期为23a左右,其次还有16a、14a、12a、8a、6a的周期变化.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.

关 键 词：四川地区 夏季降水 时空特征 

分 类 号：P426.62[天文地球—大气科学及气象学]