Ice thickness, remote sensing and sensitivity experiments using ice-flow modelling for major outlet glaciers of the Southern Patagonian Icefield (ITERATE)

使用南巴塔哥尼亚冰原主要出口冰川的冰流模型进行冰厚度、遥感和灵敏度实验（ITERATE）

• 批准号: 465209701
• 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: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/465209701?language=en
• 关键词: Ice; thickness; remote; sensing; sensitivity

The project aims at improving our process understanding of glacier changes and their constraints and sensitivities to potential future perturbations. In order to achieve those goals we will acquire new data, update our existing comprehensive spatial databases and combine information into local-scale ice-flow modelling and an analysis of different forcing scenarios. Specifically we will acquire additional ice thickness data using helicopter-based ice penetrating radar surveys as well as airborne laser scanning surveys. The airborne surveys are carried our in close cooperation our international partners. We will temporally densify our spatial information on glacier extent from optical satellite data, compute surface velocity fields by intensity offset tracking from regular Sentinel-1 radar imagery and compute improved surface elevation and mass change estimates. We will assimilate our spatial fields in a state-of-the-art ice thickness reconstruction approach. Latter will be constraint by the new and existing ice thickness measurements from different groups as well as by novel bathymetric data in order to generate a new map of the bedrock topography. We will adapt our existing reconstruction approach since we will have to weight the different ice thickness measurements in regard to their quality. The last task comprises the setup of high-resolution ice dynamic models for specific glaciers, namely Perito Moreno, Upsala and Viedma glaciers. We will specifically test different calving routines implemented in ELMER/Ice and perform perturbation experiments in order to test the glaciers’ sensitivity on certain variables and parameters like bed elevation, basal friction, lake level, calving parameters and frontal ablation.

该项目旨在提高我们对冰川变化及其对未来潜在扰动的限制和敏感性的理解。为了实现这些目标，我们将获得新的数据，更新现有的综合空间数据库，并将联合收割机信息纳入当地规模的冰流建模和对不同强迫情景的分析。具体来说，我们将使用基于雷达的冰穿透雷达调查以及机载激光扫描调查来获取更多的冰厚度数据。空中调查是在我们的国际伙伴密切合作下进行的。我们将从光学卫星数据中对冰川范围的空间信息进行时间加密，通过常规Sentinel-1雷达图像的强度偏移跟踪计算表面速度场，并计算改进的表面高程和质量变化估计。我们将用最先进的冰厚重建方法来同化我们的空间场。后者将受到来自不同小组的新的和现有的冰厚测量结果以及新的测深数据的限制，以便生成新的基岩地形图。我们将调整我们现有的重建方法，因为我们将不得不根据质量对不同的冰厚测量值进行加权。最后一项任务是为特定冰川，即佩里托莫雷诺、乌普萨拉和维埃德马冰川建立高分辨率冰动态模型。我们将专门测试在ELMER/Ice中实施的不同产犊程序，并进行扰动实验，以测试冰川对某些变量和参数的敏感性，如河床高程，基底摩擦，湖面，产犊参数和锋面消融。