近48年来邢台地区降水量变化趋势分析

Analysis on Variation Trend of Rainfall in Xingtai Area in Recent 48 Years

[目的]分析近48年来邢台地区降水量变化趋势。[方法]根据河北省邢台、南宫、沙河、内丘1963～2010年的逐年及季降水量资料,采用年际变化降水量折线图、趋势图以及气候变率等方法,对近48年来邢台地区的降水量变化趋势进行分析。[结果]1963～2010年邢台地区年降水量呈逐年减少趋势,减少速率为18.0 mm/10a,邢台、南宫、沙河、内丘4站的年降水量大体呈现出相同趋势,均呈线性减少趋势。近48年邢台地区除春季降水量有所增加外,夏、秋、冬季降水量均呈线性减少的趋势,夏季降水量减少速率最大,夏季降水量的减少对全年降水量的减少起着决定性的作用;冬季降水量减少趋势不如秋季降水量减少趋势显著。[结论]该研究为气候变暖背景下邢台地区的气候变化特征提供理论依据。

[Objective] The research aimed to analyze the variation trend of rainfall in Xingtai area in recent 48 years.[Method] According to the annual and seasonal rainfall data in Xingtai,Nangong,Shahe and Neiqiu during 1963-2010,by using the interannual variation rainfall line chart,trend chart and climatic variability,the variation trend of rainfall in Xingtai area in recent 48 years was analyzed.[Result] The annual rainfall in Xingtai area during 1963-2010 presented yearly decrease trend,and the decrease velocity was 18.0 mm/10a.The annual rainfalls in Xingtai,Nangong,Shahe and Neiqiu all presented the linear decrease trend.Except spring rainfall in Xingtai area in recent 48 years increased,the rainfalls in summer,autumn and winter all presented the linear decrease trend.The decrease velocity of summer rainfall was the maximum.The decrease of summer rainfall played decisive role in the rainfall decrease in the whole year.The decrease trend of winter rainfall wasn＇t as obvious as that of autumn rainfall.[Conclusion] The research provided theoretical basis for studying the climatic variation characteristics in Xingtai area under the climatic warming background.