基于CryoSat-2数据的纳木那尼冰川冰面高程变化方法研究

摘要

随着全球气候变暖,中亚地区大部分冰川逐渐变薄.高海拔山地冰川的变化会影响到周边地区的水资源和海平面变化,因此,我们需要高精度的地表高程观测数据来监测冰面高程变化.本文以喜马拉雅山脉西段的纳木那尼冰川为例,基于CryoSat-2卫星雷达高度计SARIn模式数据,修改了伪重复轨平面拟合方法,并计算了从2010年8月至2016年7月的冰面高程变化.纳木那尼冰面平均高程变化率为-0.47±0.44 m/year,整体呈现变薄趋势,与前人文献的结果基本一致,表明CryoSat-2数据在山地冰川使用伪重复轨平面方法估算高程变化有效可行.%With the climate of global warming, most of the glaciers in Central Asia are thinning. The changes of alpine glaciers will af-fect the water resources and sea level changes in the surrounding areas, thus we need the high-accuracy surface elevation observa-tions to research the glacier elevation change. The Naimona' Nyi glacier in the western Himalaya Mountains is given as an example of the research. Based on the CryoSat-2 satellite data of SARIn mode data, we adjust the pseudo-repeat track method and use the up-dated method to calculate the change of ice elevation from August 2010 to July 2016. The average elevation rate of the Naimona'Nyi glacier, where showed thinning, is -0. 47 ± 0. 44m/year. The result is similar to those in the reference, which proved that the Cry-oSat-2 data calculated by the pseudo-repeat track method is useful for estimating the elevation change of mountain glaciers.