宁夏日照时数的时空变化特征分析  

Spatio-Temporal Change of Sunshine Hour in Ningxia during the Past 50 Years

作　　者：霍华丽[1] 刘普幸[1] 张克新[1] 

机构地区：[1]西北师范大学地理与环境科学学院,甘肃兰州730070

出　　处：《中国沙漠》2011年第2期521-524,共4页Journal of Desert Research

基　　金：国家自然科学基金项目(40961035);甘肃省自然科学基金项目(0803RJZA094);甘肃省教育厅导师项目(0801-11);西北师范大学第三期科技创新团队项目共同资助

摘　　要：基于宁夏回族自治区9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空间插值分析和morlet小波功率谱等方法,对宁夏日照时数的变化特征进行了分析。结果表明,近50 a来,宁夏年平均日照时数总体呈减少趋势,平均减少幅度为-2.23 h/10a,2000年以来显著减少;冬季日照时数呈减少趋势,春季则呈增加趋势。宁夏日照时数空间差异明显,表现为自北向南呈增加趋势;北部绿洲区和中部区日照时数呈减少趋势,南部山区呈增加趋势,其中,中北部以银川市日照时数减少幅度最大,而南部山区以固原市增加幅度最大。周期分析表明,北部绿洲区存在显著的11 a和7 a周期,中部为5 a和4 a的周期,南部山区存在7 a和4 a周期。Seasonal,annual,and decadal changes of sunshine hour in Ningxia in recent 50 years were analyzed by the use of methods of climate tendency rate analysis,Kriging interpolation and wavelet analysis.The results showed that the annual sunshine hour decreased with an average rate of-2.23 h/10a,and the decrease trend was significant after 2000;The sunshine hour decreased in winter,but increased in spring;The annual sunshine hour increased from north to south,and the sunshine hour in the north region and the middle region decreased,but increased in the south region;The extent of decrease in Yinchuan is the maximum,and the extent of increase in Guyuan is the maximum.Morlet wavelet analysis of sunshine hour change in Ningxia showed that there were periods of 11-year and 7-year in the north region,5-year and 4-year in the middle region,and 7-year and 4-year in the south region,respectively.

关 键 词：日照时数 KRIGING插值 周期分析 宁夏 

分 类 号：P422.1[天文地球—大气科学及气象学]