寿宁县近50年日照时数变化特征分析

Variation Characteristics of Sunshine Hours in Souning County in 50 Years

利用福建省寿宁县气象局1961-2010年日照时数资料,对日照时数的年、季、月变化趋势和突变等气候变化特征作了较全面分析。结果表明:近50年寿宁县日照时数呈减少趋势,其气候倾向率为-33.4 h/10 a。日照时数的年际变化幅度较大,峰值(1963年)与谷值(2000年)相差797.7 h。日照时数变化存在明显的季节差异,夏、冬两季呈减少趋势,夏季减少最明显,冬季次之;春、秋两季变化较平缓,春季呈略增加趋势,秋季呈微弱减少趋势。就日照时数变化的月份分布而言,一年中仅4、5、6、11月4个月呈增加趋势,其余8个月份均呈减少趋势,且减少趋势明显比增加趋势强烈的多。采用累积距平曲线方法对年日照时数进行突变检验,表明年日照时数在1988年发生一次突变,表现为1988年后日照时数从偏多期转为偏少期。

Base on the sunshine hours data of Souning County Meteorological Bureau,Fujian Province from 1961 to 2010,we made a comprehensive analysis about the mutation characteristics of sunshine time of years,season,month change trend and other climate change.The results showed that:The sunshine hours in Shouning County reduced in nearly 50 years,and the cli-mate tendency rate is-33.4 h/10 a. Interannual variability is obvious:The difference between the peak value(1963) is 797.7 h.The seasonal difference in sunshine hours was evident, and decreasing amplitude in season was summer, winter, spring and autumn in turn.As for the months of sunshine hours change,there were only 4 month(April, May, June, November) Showed a trend of increase,and other months showed trend of decrease.Use Cumulative anomaly curve method to test annual sunshine hours,the results showed that: Annual sunshine hours had a sudden change in 1988. Characterized by: since 1988, sunshine hours stage from more to less.