祁连山低云量对气候变暖的响应

Response of Qilian Mountain Low Clod Cover to Global-Warming

利用祁连山区周围34个测站,1961—2000年历年1—12月平均低云量资料,采用线性回归分析、合成分析、相关分析等方法,分析了40年来祁连山区低云量与气温变化的关系。结果表明:云量变化与气温变化存在一定的对应关系。在平均气温升高1℃的情况下,祁连山区年平均低云量减少1%—6%,其中祁连山东南部减少最多达22%,而柴达木盆地和河西走廊增加10%—40%。低云量对气温响应较好的区域秋、冬季是柴达木盆地,春季是祁连山区,夏季是河西走廊地区。

Using the low cloud cover date of 34 stations from January to December in the period 1961-2000 over Qilian mountain area, the relationship between variations of low clod cover and average temperatures for 40 years were analyzed by regression, composite, correlation analysis methods. The results showed that the average temperature corresponded to the low clod covers over Qilian mountain area. when the average temperature increased by 1℃, the low cloud cover was found to decrease 1% -6% over the majority region of Qilian mountain area, and the cloud decreased by 22% mostly over its southeastern area, but the cloud increased by 10% -40% over the Chaidamu basin and Hexi corridor. The better districts of response of low clod cover to warming were Chaid- amu basin in winter and in autumn and Qilian Mountain in spring and Hexi corridor in summer.