近43年岱海湖区气候变化特征分析

利用岱海湖区的气象观测资料,对岱海湖区的气候变化特征进行了初步分析。结果表明:近43年来,岱海湖区气温呈现出明显的升高趋势,其中20世纪90年代上升幅度为最大,高出多年平均水平0.63℃;而湖区的降水量和蒸发量则呈现出减少趋势,其变化倾向率分别为-9.64mm/10 a和-12.98 mm/10 a;结合大气干旱指数的计算结果,对岱海湖区的气候变化特征进行了阶段性划分,其中20世纪60年代和70年代为相对冷湿期,80年代是冷湿向暖干发展的过渡期,而90年代以后湖区则呈现出明显的暖干化趋势。

Analysis on characteristics of climatic change in the region of lake Daihai in recent 43 years

Climatic change were analyzed by using the observed meteorological data in the region of lake Daihai in 1960-2002.The results indicated that temperature showed an obvious trend of increase in recent 43 years,especially in 1990-2002,the increasing trend of temperature was extremely obvious,and the average temperature from1990 to 2002 was higher than that from 1960 to 2002,with an increase amplitude of 0.63℃;but the precipitation and evaporation had a decreasing trend,and its changing rate was by-9.64mm/10a and-12.98 mm/10a respectively.Based on analysis of main climatic factors and results of calculation about atmospheric drought index,the changing period of 1960-2002 was divided into several stages in the region of lake Daihai.The stage from 1960s to 1970s was relative cold-wet period;however,there was an obvious warm-dry trend from 1990 to 2002;and 1980s was a transitional stage from cold-wet period to warm-dry period.