四川盆地近40年来的降水特征分析  

PRECIPITATION FEATURES OF SICHUAN BASIN IN THE RECENT 40 DECADES

作　　者：邵远坤[1] 沈桐立[1] 游泳[2] 康岚[2] 

机构地区：[1]南京信息工程大学大气科学系,江苏南京210044 [2]四川省气象局,四川成都610072

出　　处：《西南农业大学学报（自然科学版）》2005年第6期749-752,共4页Journal of Southwest Agricultural University

基　　金：国家自然科学基金项目资助课题(40075023)

摘　　要：对四川盆地22个站点1958-2000年43 a来的降水特征的分析表明:盆地内降水的相对变率比较小,降水相对比较稳定,但是盆地内的降水有较强的分布不均匀性,盆地西部近40 a来降水的长期变化有明显减少的趋势。盆地内降水异常的1个显著特征就是盆地西部与东部的反位相分布,盆地内暴雨发生频率在时空分布上都有相似的特征。Based on the data of 22 observational points and meteorological stations in Sichuan from 1958 to 2000, the characteristic features of precipitation in the Basin is analyzed. The results show that precipitation in Sichuan Basin is relatively stable with little annual variability. However, annual precipitation is unevenly distributed. A long - tern trend of precipitation in the recent 40 decades is manifested in decreasing rainfall in the western part of the Basin. The rainfall anomaly in the Basin is characterized by an anti - phased distribution between its eastern and western parts. The frequency of rainstorms is similar all over the Basin in their spatial and temporal distribution.

关 键 词：降水特征 相对变率 降水异常 反位相 暴雨发生频率 

分 类 号：S161.63[农业科学—农业气象学]