石羊河流域近50 a来日照时数的时空变化特征分析

 基于石羊河流域5个气象站点1959—2008年的日照时数资料,采用气候倾向率分析、Kriging空间插值、Mann-Kendall检验、小波分析等方法对石羊河流域日照时数的变化特征进行了分析。结果表明,近50 a来,石羊河流域年日照时数呈显著增加趋势,其变化倾向率为33.9 h/10a;四季日照时数均呈增加趋势,春季增加最显著,对年日照时数的贡献率最大,冬季次之。石羊河流域日照时数空间差异显著,表现为年日照时数自南向北递增。突变分析表明,1987年为日照时数的突变年。Morlet小波分析表明,石羊河流域年日照时数存在8 a的显著周期。

Spatio-temporal Change Characteristics of Sunshine Hour in Shiyang River Basin in Recent 50 Years

Based on the sunshine hour data from 5 weather stations in Shiyang River basin during 1959—2008, the spatial and temporal variety of the sunshine hour was analyzed with methods of climate trending rate analysis, Kriging interpolation, Mann-Kendall abrupt change test and wavelet analysis. The annual sunshine hour in Shiyang River basin obviously increased at a trending rate of 33.9 h/10a. The sunshine hour increased in all seasons, and the increasing rate in spring was the most significant, which made the greatest contribution to the increase of annual sunshine hour. The spatial distribution of sunshine hour in Shiyang River basin was quite different, and the sunshine hour increased from the south to north. The abrupt change of sunshine hour in Shiyang River basin happened in 1987. Morlet wavelet analysis showed that variation of sunshine hour in Shiyang River basin had a period of 8 years.