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冰川反照率是联系冰川与气候、寒区水文过程的纽带,也是制约分布式冰川能量-物质平衡模型发展的重要因子.冰雪反照率的变化会改变整个地气系统的能量收支平衡,亦可引起局地以至全球的气候变化.利用Landsat TM/ETM+数据,运用不同学者提出的窄波段转换宽波段的方程,反演了祁连山七一冰川总短波段的反照率.把不同的转换方程得到反演值与实测值进行比较,选择绝对误差最小的反演公式.结果表明:Duguay1992模型提出的方程能保证4景影像反演值与实测值的绝对误差在0.05范围内,而气候模式输入的反照率产品要求绝对误差在0.05以内.运用该方程反演的反照率结果,较其他方程要准确,可为分布式冰川物质-能量平衡模型的构建提供更准确的参数数据.
Glacier albedo is a link between the glacier and the climate and the hydrological processes in the cold area, and is also an important factor that restricts the development of the energy-matter balance model of distributed glaciers. The changes in ice albedo will change the energy budget balance of the whole ground-based gas system. Which causes local and global climate change.By using the data of Landsat TM / ETM +, the albedo of total short-wavelength band of Qiylian glacier is retrieved by using the equations of narrowband conversion of wideband proposed by different scholars.And different conversion equations are obtained The results show that the equation proposed by Duguay1992 model can ensure that the absolute error between the inversion value and the measured value of the four-scene image is within the range of 0.05, while the inversion of the input of the climate model The absolute error of the rate product is less than 0.05. The albedo results retrieved by this equation are more accurate than other equations and can provide more accurate parameter data for the construction of the distributed glacier matter-energy balance model.