近61年来渭河上游陇西段气候变化特征分析

利用陇西县气象站1957—2017年气温和降水观测资料,采用趋势分析、Mann-Kendall检验法和滑动t检验法,分析近61年来渭河上游陇西段气候变化特征。结果表明,近61年来渭河上游陇西段气温呈上升趋势,上升幅度为0.270℃/10 a;春夏秋冬四季气温均呈上升趋势,其中冬季气温上升最为明显,上升幅度为0.312℃/10 a;20世纪50年代—80年代初,气温呈缓慢下降趋势,80年代后期开始,气温逐渐回升,在1997年发生了一次明显增暖的突变。近61年来渭河上游陇西段降水量呈下降趋势,下降幅度为9.535 mm/10 a;其中夏、秋两季降水量呈下降趋势,春、冬两季降水量呈上升趋势,上升幅度较小;降水量在近61年来没有出现明显的突变现象。

Analysis on Climate Change Characteristics of Longxi in the Upstream of Wei River in Recent 61 Years

Using the temperature and precipitation observation data in Longxi meteorological stations from 1957 to 2017,the characteristics of climatic change in Longxi in the upstream of Wei River in recent 61 years were analyzed by linear tendency analysis,Mann-Kendall test and t-test methods.The results showed that the temperature presented ascending trend in Longxi in the upstream of Wei River in recent 61 years,the tendency rate was 0.270 ℃/10 a.The temperature ascended at all seasons,most obviously in winter,the tendency rate was 0.312 ℃/10 a. From 1950s to early 1980s, the temperature decreased slowly, and the temperature began to rise gradually in the late 1980s.The temperature had a ascending abrupt change in 1997.The precipitation showed decending trend in the past 61 years,the tendency rate was 9.535 mm/10a. The precipitation showed decending trend in summer and autumn;the precipitation showed a small ascending trend in spring and winter.Pre-cipitation had no obvious abrupt change in the past 61 years.