近59年河池市宜州区日照变化特征分析

Characteristics Aualysis of Sunshine Change in Yizhou District,Hechi in Recent 59 Years

利用广西河池宜州国家气象观测站1962—2020年日照观测资料,采用线性趋势、滑动平均、累积距平及Mann-Kendall检验法等方法,分析宜州区日照时数年际变化、季节变化、月变化及突变分析。结果表明,宜州区日照时数随年份变化有显著下降趋势,下降倾向率为-72.3h/10a,峰值和谷值相差697.2h,在1980年发生了由多到少的突变;日照时数还存在明显的季节差异,夏、秋季变化较大,春、冬次之;月日照时数呈单峰型,8月日照时数最多,为204.7h,2月最少,为53.4h,两者相差151.3h。

Using the sunshine observation data from 1962—2020 of Yizhou National Meteorological Station,Guangxi,the interannual,seasonal,monthly and abrupt changes of sunshine duration in Yizhou district were analyzed by means of linear trend,moving average,cumulative anomaly and Mann-Kendall test.The results showed that there was a decreasing trend in sunshine hours in Yizhou district,with a decreasing tendency rate of-72.3 h/10 a,and a large variation range,with a difference of 697.2 h between peak and trough,and a sudden change from more to less in 1980,and a significant seasonal difference in sunshine hours,in summer,autumn,Spring and winter,and in August,the sunshine duration was 204.7 h and 53.4 h,respectively,with a difference of 151.3 h.