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以祁连山七一冰川为例,基于Landsat TM/ETM+数据建立了通过单波段(近红外波段)阈值法提取雪线的方法,并结合观测数据进行了验证.将此方法应用到2000-2013年木孜塔格冰鳞川冰川粒雪线高度变化的估算中,结合茫崖气象站暖季气温(9、7、8月份的平均气温)和6-8月降水量数据,探索粒雪线高度与气温、降水量之间的关系.结果表明:单波段阈值法可较为准确地估计冰川的雪线位置,2000-2013年冰鳞川冰川粒雪线高度呈波动变化,在2006年达到最大值(海拔5 678 m).气温升高是冰鳞川冰川粒雪线高度变化的主导因素,气温上升1℃可导致粒雪线高度升高约83 m.
Taking Qiylianshan glacier as an example, a method of extracting snow line by single-band (near-infrared) threshold was established based on Landsat TM / ETM + data and verified with observational data.This method was applied to Muzi In the estimation of the height change of the snow line in the Tabe glacier glacier, the relationship between the height and the temperature of the snow line, the precipitation and the temperature of the snow line were explored based on the temperature of the Mangya weather station in the warm season (average temperature in January, July and August) The results show that the single-band threshold method can accurately estimate the snow line position of the glacier, and the height of the snow-ice line in the ice-scale glacier fluctuated from 2000 to 2013 and reached the maximum in 2006 (5 678 m above sea level) The temperature rise is the dominant factor in the snow level change of the ice - scale glacial glacier, and the temperature rise of 1 ℃ can lead to the elevation of the snow - snow line about 83 m.