西藏日喀则地区气候变化分析

An Analysis of Climatic Variability in Rikaze from 1956 to 1997

用日喀则地区４ 个主要代表站１９５６～１９９７ 年气温和降水资料，将日喀则地区划分为３ 个气候区域，分析了４０ 年的气温、降水变化特征。结果表明：４０ 年来日喀则地区气候逐渐变暖，特别是进入８０ 年代以来增温尤为明显，增温幅度西部地区明显大于沿江河谷主要农区和南部边缘地区。气温异常暖在冬夏两季均可发生，而且近年来有增多趋势，但大范围异常冷却很少见。降水在西部地区、沿江河谷主要农区有减少现象，而南部边缘地区有增多的事实。

The temperature and precipitation data at four representative stations in Rikaze of Tibet from 1956 to 1997 was analysed.Rikaze region was divided into three climatic areas and the variation characters of temperature and precipitation in every area during forty years were studied.The results show that the climate gets warmer gradually in Rikaze in forty years,and it was obviously warm in the 1980′s.The rising temperature in the western Rikaze was more than that of the valley along the Yaluzangbu river and the southern border area.The anomalous warm may be occured in both winter and summer and the frequence is rising in the recently years,but the anomalous cold is seldom.The decreasing trend of precipitation appears in the west and in the valley and the increasing trend in the southern border area.