基于MODIS的长江源近10年积雪反照率时空分布及动态变化  

Spatial and Temporal Distribution and Trend of Snow Albedo Changes in the Source Region of theYangtze River in Last Decade Based on MODIS

作　　者：吴雪娇[1,2] 鲁安新[3] 王丽红[1] 张华伟[1,2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049 [3]中国科学院对地观测与数字地球科学中心,北京100094

出　　处：《地理科学》2013年第3期371-377,共7页Scientia Geographica Sinica

基　　金：全球变化国家重大科学研究计划(2010CB951403);国家自然科学基金重点项目(40930526);国家自然科学基金重大项目(41190084);国家自然科学基金委基础科学人才培养基金冰川学冻土学特殊学科点(J0930003/J0109)联合资助

摘　　要：利用EOS-MODIS卫星的积雪反照率数据和一元线性回归法分析2001-2010年长江源区积雪反照率的分布及变化趋势。结果表明：①长江源区积雪季积雪反照率空间分布差异大。冰川区是积雪反照率高值中心（0.67-0.91）,长江源东部地区是低值中心（0.15-0.48）。②积雪反照率空间分布四季变化明显,峰值出现在次年1月份。③长江源区近10 a积雪季平均积雪反照率在高海拔区和冰川区增大比较显著（0.001 2/a）。与积雪面积和积雪季降雪量变化呈显著正相关;而源区夏季各月积雪反照率有明显降低趋势,与夏季温度的变暖趋势呈正反馈关系。Albedo determines surface absorption capability for the solar radiation and impacts the surface radia-tion balance. The albedo on snow and ice is higher comparing other surfaces, and the absorption of energy from the sun is little on an ice or snow field. Monitoring and researching snow and ice albedo characteristics and variation are necessary to provide accurate data and the theoretical basis for hydrological process research of snow and ice. EOS-MODIS satellite data of snow albedo （MOD10A1 on Level3）were used in the article to analyze the regional and seasonal distribution of snow albedo, as well as the inter-annual trends in the source region of the Changjiang River from 2001 to 2010 using softwares such as ArcGIS and ENVI. Based on the meteorological data of 3 stations on the source region of the Changjiang River from 2000 to 2010, the basic features of temporal changes of temperature and precipitation were investigated. The results show that： 1） Snow albedo were different with space distribution in the snow season in the source region of the Yangtze Riv- er. The snow albedo was high on the northern source region of the Yangtze River and on the southwest of the source region of the Changjiang River with 0.67 to 0.91, respectively, whereas part of the east of the source re- gion of the Changjiang River was low （0.15 to 0.48）. The distribution of snow albedo closely related to spatial distribution of snow depth and effected by altitude. 2） The seasonal spatial distributions of snow albedo changed obviously in＇the source region of the Changjiang River. The snow albedo for the large proportion area of study area were 0.66-1, 0.4-0.57, 0-0.4 and 0.48-0.66 in winter, spring, summer, and autumn respectively. The variation of the seasonal snow albedo between spring and summer was the largest with difference of 0.3 to 0.5. In monthly scales, the mean snow albedo of the whole source region of the Changjiang River had the larg-est value in January （0.6）, and the lower values in July （0.41） and A

关 键 词：MODIS 积雪反照率 长江源 温度 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]