本溪地区气候环境变化特征分析

利用辽宁省本溪地区1953-2005年温度、降水、日照、平均最高气温、平均最低气温以及界限温度、无霜期和积温等资料,对50多年农业气候环境变化趋势进行分析,结果表明:本溪地区50多年来气候变化特点是温度上升,降水、日照呈减少趋势。特别是近15a,降水除春季有所增加外,其他各季均为减少趋势;气温增暖幅度加大,对气候变暖贡献最大的是冬季;平均最低气温升温幅度明显高于平均最高气温;气温日较差变小;各界限温度初日提前,终日拖后;初霜延后,终霜提前,无霜期延长,积温增加明显,极端气候事件出现的几率增大。

Based on the temperature, precipitation, sunshine, the average maximum temperature, minimum temperature, and temperature limits, frost-free period and accumulated temperature from 1953-2005 in Benxi, the characteristics of the climate changes were analyzed. The results showed that the climate change is an increasing trend in temperature with precipitation and sunshine decreased in the past years in Benxi. Especially in the past 15 years, the precipitation except to spring, the others were decreasing; the rate of temperatures warming was increasing, and the biggest contribution to the warming was in winter, the increasing rate of average minimum air temperature was higher than the average rate of maximum air temperature, and diurnal range changed smaller; the beginning of boundary temperature brought forward, its ending time was delayed. The first frost appeared late, while the last frost ended early; frost-free period extended, accumulated temperature increased significantly, and the risk of extreme weather events was increased.