近50年陕甘宁地区气候变化特征分析

An Analysis on Characteristics of Climate Change in Shan-Gan-Ning Region in Recent 50 Years

根据陕甘宁地区气温、降水和蒸发量资料,运用回归分析、趋势分析和5年滑动平均法,分析该区1955-2004年的气候演变过程,比较不同气候要素在不同阶段的变化特点,特别是退耕还林近5来气候的变化趋势。结果表明:50年来年均温呈明显上升趋势,冬春温增幅较大;降水呈减少趋势,夏秋季降水急剧减少;蒸发量减少。近5年来,温度保持在较高水平,秋冬季降水有所增加,降水变率增大。最后,初探了陕甘宁地区气候变化的原因,肯定该区仍处于暖干期,指出气候变化特征对该区生态建设的指导意义。

Based on the temperature,precipitation and the evaporation date from 1955 to 2004 in Shan-Gan-Ning Region,the research analyzes the characteristicsofclimate evolution andcompares the course of change during different periods,especiallythe change trends in the recent 5 years.The results indicate:Over the past 50 years,themean annual temperature is rising obviously with a bigger increasingrate in winter and spring than summer and autumn;themean annual precipitationis in decline,especiallyin summer and autumn;...