近50年山东省日照时数变化特征分析

利用山东26个代表站1961年1月～2009年2月日照时数资料,采用线性倾向估计及累积距平等方法分析了山东日照时数时空变化特征。分析结果表明,1961年以来山东年、季、月日照时数均呈下降趋势,且以夏季减少的幅度最大,其次为冬季,春季减少的幅度最小;全省各地均呈递减趋势,减幅大的地区主要位于山东省的西部及中南部地区;日照时数变化趋势转折时间大致出现在20世纪80年代中期。

Analysis on Variation Features of Sunshine Hours in Shandong Province during the Recent 50 Years

Based on the sunshine hours data of 26 representative stations in Shandong Province from January,1961 to February,2008,thespatial and temporal variation features of Sunlight hours in Shandong Province were analyzed by the methods of linear trend estimation and ac-cumulative anomaly,the analysis results indicated that,the monthly,quarterly and annual sunshine hours in Shandong Province presented anincreasing tendency since 1961,the increase rate was the biggest in summer,followed by winter and the smallest in spring;the sunshine hoursall decreased in the whole China,and the largest decrease could be found in Western,Central and Southern China.The mutation of sunshinehours happened around the middle of 1980s.