基于冰川流速的喀喇昆仑地区典型冰川厚度反演与冰储量估算

Inversion of typical glacier thickness and estimation of ice volume in Karakoram region based on glacier velocity

文章以青藏高原喀喇昆仑地区却哥隆玛冰川、锡亚琴冰川和巴尔托洛冰川3条规模较大且具代表性的冰川作为研究对象,利用Sentinel-1A卫星雷达影像和像素跟踪算法获取冰川表面流速数据,并基于数字高程模型(digital elevation model,DEM)和冰川表面流速数据,运用层流理论对目标冰川进行厚度反演和冰储量估算;采用全球冰川厚度产品对反演结果进行准确度评价,同时探讨采用层流理论反演冰厚的内在机制及存在的不确定性。结果表明,采用层流理论反演冰川厚度具有较好的可行性。研究结果可为青藏高原冰冻圈动态变化研究提供参考。

This paper focuses on the three large and representative glaciers,respectively named the Chogolungma Glacier,the Siachen Glacier and the Baltoro Glacier in the Karakoram region of Qinghai-Tibet Plateau.With the laminar flow theory,the thickness inversion and ice volume estimation of the glaciers are carried out based on digital elevation model(DEM)and glacier surface velocity data,which is obtained by pixel tracking algorithm with Sentinel-1A satellite synthetic aperture radar(SAR)images.Then,the accuracy of inversion result is evaluated by using global glacier thickness data products,and the internal mechanism and uncertainty of the laminar flow theory for inversing ice thickness are discussed.The results show that the laminar flow theory is feasible in the inversion of glacier thickness,and could provide reference for the study on dynamic changes of the cryosphere in the Qinghai-Tibet Plateau.