祁连山区日照时数的空间差异、突变与多尺度分析  

Analysis of Spatial Differences,Mutation and Multi-Scale Atributes of Sunshine Duration in the Qilian Mountains

作　　者：张锐[1] 刘普幸[1,2] 张克新[1] 贾文雄[1] 

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070 [2]兰州大学中德干旱环境联合研究中心西部环境教育部重点实验室,兰州730000

出　　处：《资源科学》2010年第12期2413-2418,共6页Resources Science

基　　金：国家自然科学基金项目(编号:40961035);甘肃省科技计划基金项目(编号:0803RJZA094);甘肃省教育厅导师项目(编号:0801-11);西北师大三期科技创新工程团队项目

摘　　要：基于祁连山区8个气象站点1958年-2006年逐月日照时数资料,利用线性趋势线、ArcGIS中的Inverse Distance Weighted插值、Mann-Kendall突变检验和Morlet小波分析等方法,对祁连山区日照时数的时空变化特征、突变特点和变化周期进行分析。结果表明:近50a来,祁连山区年平均日照时数呈增加趋势,冬季日照时数呈减少趋势,春、夏、秋季呈增加趋势,且以春季增幅最大;日照时数增幅大小具有显著的中西段大、东南段小的地域差异;增加突变显著,突变时间存在空间差异性。日照时数的周期(p≤0.1)具有多尺度、多层次和多分辨的特性结构,且表现出由中段21a中尺度周期向西、向东逐渐变为4～7a短周期的地域特征。The Qilian Mountains regions are situated at the northeast edge of the Qinghai-Tibet Plateau.As the key water source area of the Hexi Corridor oasis,the Qilian Mountains regions have been receiving much attention on issues of water resources and environmental changes.Investigating response of changes in temperature,precipitation,and sunshine duration over the regions to environmental changes is of significance in both theory and practice.As for rational distribution of agricultural production and adjusting the planting structure,it is essential to understanding characteristics and changing trends of sunshine duration.Based on data of the mean annual sunshine duration at 8 weather stations during the period 1958-2006,characteristics of temporal,spatial,as well as mutation in sunshine duration over the Qilian Mountains regions were analyzed in detail using the linear trend,ArcGIS spatial analysis functionality,Mann-Kendall,and Morlet wavelet.Results indicated that the sunshine duration increased significantly in recent 50 years at a rate of 16.72 h/10a,showing high spatial heterogeneity.The sunshine duration in winter decreased slightly,but increased in other seasons,in particular largest in spring.The increasing magnitude varied greatly over space.There was an obvious increasing center in western and central Sunan and Subei.It was found that the trend coefficient was lowest over the east of Menyuan.The time of mutation of the sunshine duration varied greatly from the middle to the west and the east,showing an earlier time in the central regions.The mutation of the sunshine duration occurred in the 1960s,2003 and 1996,respectively,for the three regions.The period（p≤0.1）of the sunshine duration had particular multi-scale,multi-level,and multi-resolution attributes.There were fluctuation periods of a 21-year in the central part,and 4-7 years in the west and east.

关 键 词：祁连山区 日照时数 变化特征 Mann-Kendall突变检验 MORLET小波分析 

分 类 号：P468.027[天文地球—大气科学及气象学]