建昌县近50年光照资源趋势变化及特征分析

Trend Changes and Characteristics Analysis of Light Resources in Jianchang County in Recent 50 Years

为进一步开发利用光能资源,应用常规统计方法对建昌近50年光照资源进行趋势、特征分析。结果表明,建昌光能资源属于丰富区,其年日照时数80%保证率为2 650 h;春夏秋冬四季80%保证率分别为750、685、660和585 h。建昌县年、季、月日照时数线性序列相关系数通过极显著检验,气候倾向率小于0,均呈下降减少趋势;并在1984～1985年出现气候"跃变",跃变之前(1960～1984年)处于下降减少阶段,跃变之后(1985～2009年)变化平稳。在近50年里,年日照时数趋势减少553 h;四季趋势减少分别为春季133 h,夏季181 h,秋季105 h,冬季128 h;各月中6、7月趋势减少最明显。

In order to light energy resource development and utilization of light resources,the trend and characteristics of light resources in Jianchang in recent 50 years were analyzed by using conventional statistical method.The results showed that Jianchang light energy resources belonged to the rich region.The annual sunshine hours with 80% guarantee rate was 2650 h and that in spring,summer,autumn and winter with 80% guarantee rate were 750,685,660 and 585 h respectively.The linear sequence correlation coefficient of the annual,seasonal,monthly sunshine hours in Jianchang passed highly significant test.The climate trend rate was less than 0,showing a decreasing trend.The climate ＂jump＂ occurred during 1984-1985.The years before the jump（1960-1984） was a decreased reduction stage.The years after the jump（1985-2009） changed stably.In recent 50 years,the annual sunshine hours had a trend of decreasing 553 h.That had the trends of decreasing 133 h（spring）,181 h（summer）,105 h（autumn）,128 h（winter）.Among the months,the decreasing trend was the most obvious in June and July.