近50年陕甘宁地区气候变化特征分析

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。

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

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;andthe evaporationvalue is reducing remarkable.From 2000 to 2004,allthetrends are going on expect that the mean annual precipitationhas anaugment trend and fluctuates violently.All the results show that the region is still in warming-drying period.At last,the paper explores the causes leading to the climate change and points that the characteristicsofclimate change shouldbe paid attention to and make good use of in the ecological constructionin this region.