近57年来本溪地区干湿程度演变分析

目的]分析近57年来本溪地区干湿程度的演变情况。方法]采用1953～2009年本溪地区的年、季、月气温和降水资料,分析了温度、降水和干湿指标的年代际变化。结果]本溪地区年平均气温呈上升趋势,其线性倾向率为0.29℃/10 a;而降水量呈明显减少趋势,其线性倾向率为-29.01 mm/10a。干湿指数呈波动性减少趋势,其线性倾向率为-33.61 mm/10a,这与20世纪80年代后温度升高、降水减少是密切相关的。结论]本溪地区呈暖干化发展趋势。

Analysis on the Evolution of Dry and Wet Degree in Benxi Area in Recent 57 Years

Objective] The research aimed to analyze the evolution situation of dry and wet degree in Benxi area in recent 57 years.Method] By using the annual,quarterly and monthly temperature and precipitation data in Benxi area during 1953-2009,the interdecadal variations of temperature,precipitation,dry and wet index were analyzed.Result] The annual average temperature in Benxi area displayed the rise trend,and the linear tendency rate was 0.29 ℃/10 a.But the precipitation showed the obvious decrease trend,and the linear tendency rate was-29.01 mm/10 a.The dry and wet index showed the fluctvation decrease trend,and the linear tendency rate was-33.61 mm/10a,which closely related to the temperature rise and precipitation decrease after the 1980s.Conclusion] It showed the warming-drying development trend in Benxi area.