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盖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，只有少数区域能够提供整个地区或全球范围内的冰川特定评估。与全球冰川模型、冰厚度重建以及可持续水管理相关。在当前项目阶段，我们分析了航天飞机雷达地形任务（SRTM）覆盖的所有冰川的海拔变化。 56°S 和 60°N 使用来自 SRTM (2000) 和德国 TanDEM-X 任务（2010 至 2015）的数据，我们应用差分 SAR 干涉测量和最先进的后处理程序来生成近场图像。对极地地区以外冰川质量变化的全球评估在这项后续提案中，我们的目标是在空间上进行扩展，利用新的观测数据更新新的时间片，并改进我们的测量。我们将比较 TanDEM-X（2010-2015 年）和 TanDEM-X 采集数据（2017 年以上）。这些数据集将提高 10 m 的空间分辨率，减少观测空隙，并覆盖 60°N 以上的区域。我们将首次提供一些拟议的冰川特定测量数据，我们将使用最近可用的全球 TanDEM-X DEM 和 ArcticDEM 作为我们处理的技术和方法参考。将包括处理链的适应、并行化和向高性能计算的转移、改进的间隙填充方法以及通过集成并发激光测高来改进穿透深度校正。我们将分析有关变化的潜在原因和导致变化的过程的结果。关于加速或减速的变化率。