近60年锦州市降水特征分析

Analysis on the Precipitation Features of Jinzhou City during the Recent 60 Years

利用1951～2010年锦州市常规气象资料,分析了锦州市降水变化特征。结果表明,锦州市1951～2010年锦州市降水量变化明显,年平均降水量为570.8 mm,20世纪50年代后期、80年代及90年后期以来处于明显少雨阶段;60年代处于多雨阶段,70年代接近常年;但进入90年代后降水变化幅度开始增大,降水极大值和极小值均出现在90年代。月降水量差异明显,其中6、7和8月的降水占年降水量的50%以上。尤其是近10年来极端旱涝的灾害事件频发,给农业生产带来一定的影响。

According to the regular meteorological data of Jinzhou during 1951-2010,its precipitation change features were analyzed.As indicated by the results,the precipitation of Jinzhou during 1951-2010 showed obvious changes with the annual average precipitation of 570.8 mm,the precipitation was on the low side in late 1950s,1980s and since late 1990s,on the high side in 1960s,and close to that of the average years in 1970s;but the changing extent of precipitation began to increase since 1990s,and both the maximum and minimum precipitation appeared in 1990s.Monthly precipitation differed largely,the rainfall amount in June,July and August accounted for 50% that of the whole year.Especially during the recent ten years,the frequent occurrence of extreme drought and flood produced certain impact on agricultural production.