Elevation and mass change measurements for glaciers and ice caps outside the large ice sheets from TanDEM-X (SATELLITE-2)

大冰盖外的冰川和冰帽显示出相当大的海拔和质量变化，是海平面变化的重要因素。然而，迄今为止，只有少数几个区域评估提供了整个区域或全球范围的冰川具体分析。这一信息与全球冰川模型、冰厚重建以及可持续水资源管理有关。在当前的项目阶段，我们使用航天飞机雷达地形使命（SRTM）（2000年）和德国TanDEM-X使命（2010年至2015年）的数据分析了56°S和60°N之间所有冰川的海拔变化。我们采用差分SAR干涉测量和最先进的后处理程序，以产生一个接近全球的评估冰川质量变化以外的极地地区。在这一后续建议中，我们的目标是在空间上扩展，使用新的观测结果以新的时间片进行更新，并从第一阶段开始改进我们的测量。我们将比较TanDEM-X（2010-2015）和TanDEM-X收购（2017+）。这些数据集将使空间分辨率提高到10米，减少观测空白，并覆盖北纬60度以上的区域。对于一些拟议的地区，我们将首次提供冰川的具体测量。我们将使用最近可用的全球TanDEM-X DEM和ArcticDEM作为我们处理的参考。技术和方法的发展将包括适应的处理链，并行化和转移到高性能计算，改进的间隙填充方法和改进的穿透深度校正，通过集成并发激光测高。我们将分析有关变化的结果、导致变化的潜在原因和过程以及加速或减速的变化率。

Glaciers and ice caps outside the large ice sheets show considerable elevation and mass changes and are strong contributors to sea level change. However, to date only few regional assessments exist that provide a glacier-specific analysis over entire region or on global scale. This information is relevant for global glacier models, the reconstruction of ice thickness as well as for sustainable water management. In the current project phase, we analyse elevation changes for all glaciers covered by the Shuttle Radar Topography Mission (SRTM) between 56°S and 60°N using data from the SRTM (2000) and the German TanDEM-X mission (2010 to 2015). We apply differential SAR interferometry and a state-of-the-art post-processing procedures to generate a near global assessments of glaciers mass changes outside the polar regions. In this follow-up proposal, we aim at spatially expanding, at updating with a new time slice using new observations and at improving our measurements from the first phase. We will compare TanDEM-X (2010-2015) to TanDEM-X acquisitions (2017+). Those data sets will enable an improved spatial resolution of 10 m, less observation voids and cover also regions beyond 60°N. For some of the proposed regions we will provide for the first time glacier-specific measurements. We will use the recently available global TanDEM-X DEM and the ArcticDEM as reference for our processing. Technical and methodological developments will comprise adaptation of the processing chain, parallelisation and transfer to high performance computing, improved gap filling approaches and improved penetration depth correction by integrating concurrent laser altimetry. We will analyse the results in regard to changes potential causes and processes leading to the changes as well as to accelerated or decelerated change rates.