熊岳地区日照时数变化趋势分析

The analysis of variation characteristics of sunshine hours in Xiongyue

为了解熊岳日照时数变化特征,合理利用农业气候资源,更好地为农业生产服务,利用1953～2010年熊岳日照时数资料,采用线性倾向估计法和积距平法,分析熊岳日照时数的变化特征,结果表明:熊岳日照时数在20世纪60年代最多,90年代最少,且仅90年代日照时数低于气候标准值;年、季日照时数均呈显著下降趋势,年日照时数以53.5 h/10a的速率减少;四季中夏季减幅最大,冬季减幅最小;突变分析显示,熊岳日照时数在1971年附近发生突变,从气候多日照时段转变成少日照时段。

In order to understand the variation characteristics of sunshine hours in Xiongyue, make reasonable use of agro-climatic resources, and better serve agricultural production, the sunshine hours variation characteristics were analyzed through the linear trend estimation and the accumulative anomalies method on the basis of the monthly sunshine hours data from 1953 to 2010 in Xiongyue. The results showed that the average sunshine hours of 1960s was the most in decadals, while the least one found in 1990s was the only one less than the climate average;the sunshine hours in Xiongyue showed a significant seasonal and annual decreasing tendency and the annual decreasing rate is 53.5h/10a;the trends of sunshine hours decrease most in summer, least in winter. The mutation analysis showed that a mutation occurred around 1971 in Xiongyue, which showed before 1971 the sunshine hours was more than climate average, while showed the opposite side after 1971.