Abstract:

Based on surfce meteorological observations from 58 meteorological stations in 1965 － 2005 in Hebei Province，the spatial
and temporal distribution characteristic of sunshine hours and its varaition trend as well as influence factors were analyzed in this paper．
The results show that sunshine hours distribution has obvious regional characteristic with more in the north plateau and mountain area，
and less in the eastern part of the Taihang Mountain，which correlated directly with Hebei’s terrain． As for temporal distribution of
sunshine hours，it has obvious seasonal character with most in spring and least in winter，which is related to the sun altitude and weather
factors． Annual and seasonal mean sunshine hours all presented descending trend in Hebei province from 1965 to 2005． The relative
humidity and total cloud had negative correlation with sunshine hours variation．

Key words: Key words, sunshine hours, spatial and temporal distribution, variation trend, influential factors

摘要：

以河北省1965 ～ 2005 年58 个气象观测站地面气象观测资料为依据，利用线性趋势分析、相关性分析、小波分析等方法，对河北1965 ～ 2005 年4 季及年日照时数的时空分布特征、变化趋势及影响因子进行分析，得出以下结论: ⑴河北省日照时数分布存在明显的地域特征，北部高原及山地日照时数较多，东部平原次之，太行山东部地区日照时数较少，日照的这种分布特征与河北地形有直接关系; ⑵河北春季平均日照时数最多，夏季次之，冬季最少，日照时数的季节分布特征受太阳高度角及天气现象、气象要素的共同影响; ⑶1965 ～ 2005 年河北春、夏、秋、冬季及年平均日照时数均呈显著下降趋势( 与时间的相关性均超过0． 01 的信度检验) ; ⑷河北各地春、夏、秋、冬季日照时数变化主要受相对湿度与总云量的影响，同时降水量、低云量、能见度等也对其有重要影响。

关键词: 河北日照, 时空分布, 变化趋势, 影响因子