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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。
Using alluvial albedo data of EOS-MODIS satellite and univariate linear regression analysis, the distribution and change trend of albedo of snow in the source region of Yangtze River from 2001 to 2010 were analyzed. The results show that: ① There is a big difference in the spatial distribution of snow albedo in the snow-capped Yangtze River source area. The glacier area is the center of albedo of high snow accumulation (0.67-0.91), and the center of the Yangtze River source is the low center (0.15-0.48). (2) The albedo of snow alluvial spatial distribution changed obviously in four seasons, the peak appeared in January of the following year. (3) The average albedo of snow cover in the Yangtze River source area in the past 10 years increased significantly at high altitude and glacier area (0.001 2 / a). There was a significant positive correlation between snow cover area and snowfall during the snowy season. However, the albedo of snow cover in the source area decreased significantly in summer and positively correlated with the warming trend in summer.