近40年哈密市日照时数气候变化特征分析

摘要

The climate change characteristics of decade,annual,seasonal and monthly sunshine durations were analyzed based on the observed data of sunshine duration in Hami City in recent 40 years in the paper.And using the moving t-test theory detected sudden climate change.The results showed that the annual sunshine durations in Hami City presented on a increasing trend in recent 40 years with a climate changing rate of 26.69 hours every ten years.Sunshine duration increased in spring and summer,while decreased in autumn and winter,increasing trend was higher than the decreasing trend clearly.Monthly sunshine hours in the 1990s were negative anomalies and in the 2010s were positive anomalies,and it increased significantly.Sunshine duration was a continuous process of change and without any sudden phenomenon.%运用哈密市近40年日照时数观测资料,分析日照时数的年代际、年、季、月特征,并运用滑动t检验法进行突变检验。结果表明：近40年来哈密市日照时数总体呈增加趋势,气候变化率为每10年增加26.69 h;春、夏季日照时数呈增加趋势,秋、冬季呈减少趋势,增加趋势明显高于减少趋势;月日照时数在20世纪90年代呈负距平,21世纪10年代为正距平,月日照时数增加显著,日照时数没有突变现象发生,是一种连续变化过程。