【摘要】 利用连山县1966—2015年日照时数资料,采用线性趋势分析、小波变换和Mann-Kendall突变检验等方法对近50年连山县日照变化进行了分析。结果表明,近50年连山县年日照时数总体呈减少趋势,变化率为-5.05 h/a,减少趋势非常显著;春、夏、秋、冬各季日照时数变化总体都呈减少趋势,气候倾向率分别为-0.74、-2.20、-1.44、-0.59 h/a。连山县年日照时数存在明显的多时间尺度变化,准16年特征时间尺度的周期振荡为主周期,25～28年尺度为第2周期。年日照时数在20世纪90年代初发生突变,具体是从1990年开始的。更多还原

【Abstract】 According to the sunshine duration data from Lianshan County from 1966 to 2015,the sunshine hours changes of Lianshan County were analyzed by using climate trend analysis,wavelet transform and Mann-Kendall mutation testing method. The results showed that the annual sunshine hours of Lianshan County was a decreasing trend in recent 50 years,the change rate was-5.05 h/a,the decreasing trend was very significant;the change of sunshine hours in spring,summer,autumn and winter showed a decreasing trend,the climate tendency rates were-0.74,-2.20,-1.44,-0.59 h/a,respectively. There was a clear multi-time scale change in the sunshine hours in Lianshan County,quasi-16-year characteristic time scale was the main cycle,25-28 years was the second cycle. The sunshine hours had suddenly changed in early 1990 s,it started in 1990.更多还原