北碚区近50年日照时数变化特征分析  

Analysis on Variation Characteristics of Sunshine Duration in Beibei District in Recent 50 Years

作　　者：张爽 李光兵 汪志辉 万敏 李强 吉莉 冉静 

机构地区：[1]北碚区气象局,重庆400700

出　　处：《西南师范大学学报（自然科学版）》2013年第11期127-131,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：重庆市气象局青年基金资助项目(QNJJ201122)

摘　　要：利用北碚区1961-2010年日照时数资料,采用线性倾向估计、累积距平、mexh小波及M-K突变检验等方法分析了北碚日照时数时空变化特征.分析结果表明,1961年以来北碚日照时数呈下降趋势,且以夏季减少的幅度最大,秋季减少的幅度最小;日照时数变化趋势转折时间大致出现在20世纪90年代前期,但是自2001年以来,秋、冬两季日照时数呈明显的上升趋势,夏季日照时数持续减少;日照时数逐月变化趋势与相对湿度的逐月变化趋势刚好相反.A linear tendency estimate, accumulative departure, mexh wavelet and M-K mutation testing method have been adopted to analyze the temporal and spatial variation characteristics of sunshine duration in Beibei by means of the sunshine duration data from January, 1961 to December, 2010 of Beibei District. The analysis shows that, since 1961, Beibei sunshine hours have tended to be a downtrend, and the maximum in summer whereas minimum in autumn; the turning time of sunshine duration changeable trend occurred mostly in the early 1990s, but since 2001, sunshine hours of autumn and winter have presented a clear uptrend while summer sunshine duration decreased continuously; sunshine hours monthly variation trend and the monthly variation tendency of relative humidity is opposite exactly.

关 键 词：日照时数 变化趋势 线性倾向估计 累积距平 mexh小波 M—K突变检验 

分 类 号：P468.027[天文地球—大气科学及气象学]