基于CryoSat-2数据的纳木那尼冰川冰面高程变化方法研究

Naimona' Nyi Glacier Elevation Changes from 2010 to 2016 Using Cryosat-2 Satellite Data

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 affect the water resources and sea level changes in the surrounding areas,thus we need the high-accuracy surface elevation observations 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 updated 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. 44 m/year. The result is similar to those in the reference,which proved that the CryoSat-2 data calculated by the pseudo-repeat track method is useful for estimating the elevation change of mountain glaciers.