乾安县40年气候变化的分析

The Climatic Changes Analysis of Qian'an in the Last 40 Years

利用东北地区月平均气温、降水量、蒸发量等资料,计算了夏季气温和降水的相关系数,表明东北地厂西部夏季气温与降水量呈显著负相关。从年代际变化的分析中得知,20世纪90年代暖干趋势明显,其中以乾安最为突出。分析乾安及其邻近测站蒸发量的年代际变化,表明乾安的夏季蒸发量上升趋势明显,并远大于其他测站,对环境的不良影响加重。而在下垫面条件较好一些的区域,夏季蒸发量呈下降趋势。乾安县未来夏季气温仍为上升趋势,降水量在总体平均值之下呈旱、涝交替变化。

The correlation coefficients between summer temperature and precipitation have been calculated. The results show that the notable negative relationships exist in the West part of Northeast area in China. From the variation in decades, the warm-dry tendency in the nineties is obvious. The variation in Qian'an is the maximum. The variation tendency of summer temperature in Qian'an is rising steadily, and the precipitation is vicissitude.