近60年福建省生长季日照时数的变化特征

The Change Characteristics of Sunshine Duration in the Growing Season of Fujian Province in the Past 60 years

利用福建省22个气象站点近60年生长季日照时数资料,通过线性倾向估计、累积距平、滑动t检验、小波方差分析等方法对福建省1961—2018年生长季(4—9月)日照时数变化特征进行分析。结果表明:生长季日照时数多年平均值为1001.11 h,最大值(1286.11 h)出现在1963年;最小值(765.70 h)出现在1997年。日照时数总体呈现下降趋势,平均每10年减少35.44 h;日照时数在1971年、1991年附近发生突变,1971年之前呈现上升趋势,1991年之后呈现下降趋势;日照时数具有四个明显周期,其中以31 a左右的周期震荡最强。

Based on the data of sunshine duration in the growing seasons of nearly 60 years from 22 meteorological stations in Fujian Province,this paper uses linear tendency estimation,accumulative anomaly,slide t-test and wavelet variance analysis to analyze the change characteristic of the growing season of 1961-2018(April-September)in Fujian Province.The results show that the average annual sunshine duration in the growing season is 1001.11h,the maximum value(1286.11h)appears in 1963,and the minimum value(765.70h)appears in 1997.The total number of sunshine durations showed a downward trend,with an average reduction of 35.44 hours per 10 years.Sunshine duration suddenly changed around 1971 and 1991,an upward trend before 1971 and a downward trend after 1991.Sunshine duration has four distinct cycles,with the most oscillating period around 31a.