秦岭太白山地表反照率动态反演  

RETRIEVAL OF DYNAMIC SURFACE ALBEDO IN TAIBAI MOUNTAIN,QINLING

作　　者：张玉龙[1,2] 党海山[1] 夏小玲[1] 何晓军[3] 张全发[1] 

机构地区：[1]中国科学院武汉植物园,湖北武汉430074 [2]中国科学院研究生院,北京100049 [3]太白山国家级自然保护区管理局,陕西眉县722300

出　　处：《长江流域资源与环境》2010年第S2期135-140,共6页Resources and Environment in the Yangtze Basin

基　　金：国家自然科学基金项目(30900199);中国科学院重要方向性项目(KSCX2-YW-Z-1023);国家科技支撑计划项目(2008BAD98B08)

摘　　要：地表反照率表征着地表物理结构的综合状况,其获取在区域温度反演、气候及辐射建模中具有重要意义。相比传统野外实测方法,利用遥感反演地表反照率体现了很大的优势。基于Landsat-TM/ETM+影像,反演计算得到太白山全年各月地表短波(包括可见光、近红处波段)反映率空间分布图,相关时空动态分析得出结论:(1)太白山年均短波反照率为0.169;对于短波反照率的贡献,近红外大于可见光,其年均值分别为0.253和0.087;(2)3种反照率空间分布梯度明显,但分布趋势基本一致,其空间变异依赖于地形因子及下垫面的分布状况;(3)太白山地表反照率季节变化显著,大体呈"U"型分布,即春、冬较高,夏、秋较低;(4)冬春季节反照率主要由冰雪效应和裸地效应主导,夏秋季节主要由植被效应和湿度效应主导。Surface albedo reflects the integrated information of surface phyical structure and is of great significance in temperature,climate and radiation modelling in region.Compared to the traditional field methods,remote sensing shows great efficiency.Based on the Landsat-TM/ETM+ images,spatial distributions of monthly surface albedo,including shortwave,visible and near-infrared band,were retrieved.Related analysis of spatial and temporal dynamics can be concluded that annual mean shortwave albedo of Taibai is 0.169,and for the contribution of shortwave albedo,near-infrared(0.253) is larger than visible(0.087).Three kinds of albedo have obviously spatial gradients,and share nearly the same distributing trend.Their spatial variations depend on topographical factors and the underlying surface.Seasonal surface albedo changes greatly in the whole year and generally takes on the 'U-type'distribution,i.e.,higher in spring and winter,and lower in summer and autumn.Winter-spring albedo distribution is dominated mainly by snow-ice and bare-ground effect,and summer-autumn albedo is dominated mainly by vegetation and humidity effect.The results of this study will provide parameters and empirical basis for the further research in Taibai Mountain.

关 键 词：地表反照率 LANDSAT 遥感反演 空间分布 季节变化 

分 类 号：P422.2[天文地球—大气科学及气象学]