1961—2018年左权县日照时数变化特征分析

利用1961—2018年左权县逐月日照时数资料,运用线性趋势分析、相关系数分析、5年滑动平均、Mann-Kendall非参数检验和滑动t检验等方法,分析了近58年来左权县日照时数年、季节及月变化特征。结果表明,左权县年日照时数呈显著下降趋势,气候倾向率为-30.78 h/10 a;四季日照时数变化中,春季呈上升趋势,夏、秋、冬季呈下降趋势,其中夏、冬两季对年日照时数减少的贡献最大;除3月、4月外,其余各月日照时数均呈下降趋势,尤以1月、6月、12月下降趋势最为显著;年日照时数在1992年发生了减少突变。

Analysis on variation characteristics of sunshine duration in zuoquan county during 1961 -2018

Based on the monthly sunshine duration data in zuoquan county during 1961- 2018, the methods of linear trend analysis, correlation coefficient analysis, 5a sliding average, mann-kendall non-parametric test and sliding t-test were used to study the variation characteristics of sunshine duration.The results showed that the annual sunshine durationin the past 58 years showed a significant decreasing trend, and climate tendency rate was -30.8h/10a.In the four seasons, sunshine duration showed an increasing trend in spring, and a decreasing trend in summer, autumn and winter, of which summer and winter contributed the most to annual sunshine duration.Except for march and April, the other months showed a decreasing trend, especially in January, June and December.The annual sunshine hours had a reduced mutation in 1992.