基于CryoSat-2雷达高度计青藏高原地区冰川高度变化提取方法对比

基于2010~2016年CryoSat-2雷达高度计SARIn模式的Level 2测高数据，结合青藏高原地区冰川矢量数据以及全球GEDM数据，通过重叠脚印法、伪平面拟合法以及较新的曲面拟合法提取青藏高原地区典型冰川冰帽的高度变化值。结果表明：①CryoSat-2测高数据应用该3种方法提取山地冰川高度变化具备可行性;②提取高度变化的3种方法各有优劣，以此提供了提取山地冰川高度变化的方法选择的依据;③应用上述3种方法获取的青藏高原地区典型冰川冰帽2010~2016年的定量高度变化结果，绝大多数的冰川都处于消融状态且3种方法提取的高度变化结果增、减趋势一致。处于西昆仑山脉的中峰冰川、古里雅、土则岗目冰川缩减速率较慢，而帕米尔高原的慕士塔格冰川缩减略快，两者的缩减速度都趋于平缓。处于念青唐古拉山脉的来古、恰青冰川高度变化速率最大。

Comparative Study on Extraction Methods of Glacier Height Change in Qinghai-Tibet Plateau based on CryoSat-2 Radar Altimeter

Based on the L2 level altimeter data in the SARIn mode of the CryoSat-2 from 2010 to 2016, combined with the glacier vector data of the Qinghai-Tibet Plateau and the global GEDM data, use the overlapping footprint method, pseudo-plane fitting method, and new method curved surface fitting to extract the height variation of typical glacier ice caps in the Qinghai-Tibet Plateau . The results show that: (1) CryoSat-2 altimetry data is feasible by using these three methods to extract height changes of mountain glaciers. (2) The three methods for extracting height changes have their own advantages and disadvantages, which provides the basis for the method selection for extracting the height variation of mountain glaciers. (3)The above three methods were used to obtain the quantitative height change results of typical glacier ice caps in the Qinghai-Tibet Plateau from 2010 to 2016. The results show that most of the glaciers are in ablation and the height change results of the three methods are almost the same. In the West Kunlun Mountains, the Zhongfeng Glacier, Guliya, and Tuzegangmu Glaciers have gentle reduce, while the Mushitage Glacier in the Palmy Plateau has shrunk slightly, but both are balance. And Laigu and Qiaqing glaciers in the Nianqing Tanggula have the fastest rate of change.