合肥市近55年日照时数气候变化特征分析

Analysis of Climate Change Characteristics of Sunshine Duration in Hefei City in Recent 55 Years

利用合肥市近55年日照时数实测资料,分析了合肥市日照时数年代际、年际、各季和各月的气候变化特征;并利用线性倾向估计法、滑动t检验法对合肥市日照时数的年、季、月气候变化趋势进行了突变分析。结果表明:合肥市年、季、月日照时数均呈减少趋势。各季中夏季日照时数减少最快,春季日照时数减少最慢;各月日照时数减少最多的是8月,减少最缓的是4月。合肥市年日照时数在1969年前后发生了明显的突变现象。

The climate change characteristics of decade,annual,seasonal and monthly sunshine durations in Hefei City were analyzed based on the observed data of sunshine duration in Hefei City in recent 55 years.Mutation analysis of the annual,seasonal and monthly climate change trend of the sunshine durations in Hefei City were carried out using the linear trend estimation and moving t-test.Result showed that the annual,seasonal and monthly sunshine durations in Hefei City were in a decrease trend since recent 55 years.Among different seasons,the reduction of sunshine duration in summer was the maximum,and that in spring was the minimum.The reduction of sunshine duration in August was the maximum among each year,and that in April was the minimum.The results of moving t-test revealed that the saltations of annual sunshine durations in Hefei City occurred around 1969.