青海高原东部边坡地带降水变化特征及突变分析

利用青海高原东部边坡地带9个地面气象站1961-2000年的降水资料,分析了区域内近40a来降水变化的时空分布特征、变化趋势及突变,结果表明近40a来,区域内东南部和西北部降水存在相反的相位变化,在降水趋势上存在西北部略增加,东南部明显减少的现象;夏季和冬季区域内大部分地方的降水量是增加的,春季和秋季表现为明显的减少趋势;秋季降水在70年代末到80年代初发生突变,80年代后秋季降水量表现为明显的减少趋势,年降水量减少的主要原因是秋季降水量的减少。

Precipitaion Variation Characeristics and Abrupt change Over the Eastern Border Region of Qinghai Plateau

Precipitation data of 9 stations over the eastern border region of Qinghai plateau from 1961-2000 were analyzed.The results showed that the northeastern's precipitation variety tendency was contrary to the southeastern's,the precipitation increased in the summer and winter,but in the spring and autumn the precipitation obviously descended.The abrupt change of autumnal precipitation was detected in the end of 1970s and the beginning of 1980s;The autumnal precipitation variety tendency was obviously decreased from 1980s,the descend of yearly precipitation resulted from the descend of autumnal precipitation.