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

TanDEM-X (SATELLITE-2) 对大冰盖外的冰川和冰盖进行海拔和质量变化测量

• 批准号: 313916628
• 负责人: Professor Dr. Matthias Holger Braun
• 金额: --
• 依托单位: Institut für Geographie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/313916628?language=en
• 关键词: Elevation; mass; change; measurements; glaciers

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.

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，到目前为止，提供整个区域或全球范围冰川具体分析的区域评估寥寥无几。这些信息与全球冰川模型、重建冰层厚度以及可持续水管理有关。在本项目阶段，我们利用航天飞机雷达地形任务(SRTM)(2000年)和德国Tandem-X任务(2010年至2015年)的数据，分析了航天飞机雷达地形任务覆盖的所有冰川在56°S和60°N之间的海拔变化。我们应用了差分合成孔径雷达干涉测量和最先进的后处理程序来生成极地以外冰川质量变化的近乎全球的评估。在这个后续建议中，我们的目标是在空间上扩展，使用新的观测数据更新新的时间片，并改进第一阶段的测量结果。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，更少的观测空洞，并覆盖60°N以上的区域。对于一些拟议的区域，我们将首次提供冰川特定测量。我们将使用最近可用的GLOBAL 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处理链、并行化和向高性能计算转移、改进的缺口填充方法以及通过整合并行激光测高来改进穿透深度校正。我们将分析导致变化的潜在原因和过程以及加速或减速变化速度方面的结果。