Assessing the current Evolution of the Greenland Ice Sheet

评估格陵兰冰盖当前的演变

• 批准号: 30614760
• 负责人: Professor Dr.-Ing. Reinhard Dietrich
• 金额: --
• 依托单位: Professur für Geodätische Erdsystemforschung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/30614760?language=en
• 关键词: Assessing; current; Evolution; Greenland; Ice

The objective of the project is to contribute to a more accurate assessment of the current evolution of the Greenland ice sheet and its major drainage basins from a combination of observational data and glaciological modeling. The modeling component of the project consists of a comprehensive three-dimensional thermomechanical ice-sheet model, a surface melt and runoff model, and a model to calculate balance velocities, with further input from a regional atmospheric climate model and a visco-elastic self-gravitating solid Earth model. The modeling will primarily yield the long-term ice sheet and bedrock evolution as well as the surface mass balance over the last few decades.The observational data come from the time-dependent geoid from GRACE, altimetry from ICESat and ERS-1/ERS-2/ENVISAT, optical data from ASTER, SAR data from ERS-1/2, ENVISAT and TerraSAR, and ground-based GPS data. These data will provide snapshots of surface elevation changes, gravity changes, surface velocity, and surface accumulation rate over the duration of the measurement platforms.The project relies on a strong interaction between observational analyses and modeling to separate the ice mass contribution from the contribution of postglacial isostatic rebound, to separate ice-sheet dynamic changes from interannual surface mass balance changes, and to separate long-term ice-dynamic changes from short-term flow fluctuations. The result will be an improved estimate of the present-day contribution of the Greenland ice sheet to global sea-level change and a better understanding of the various contributions to current ice mass changes and their associated uncertainties.

该项目的目标是结合观测数据和冰川学模型，帮助更准确地评估格陵兰冰盖及其主要流域的当前演变。该项目的建模部分包括一个全面的三维热机械冰盖模型、一个表面融化和径流模型以及一个计算平衡速度的模型，并进一步从一个区域大气气候模型和一个粘弹性自引力固体地球模型获得投入。观测数据来自GRACE的时变大地水准面、ICESat和ERS-1/ERS-2/ENVISAT的测高数据、ASTER的光学数据、ERS-1/2、ENVISAT和TerraSAR的SAR数据以及地基GPS数据。这些数据将提供测量平台持续期间的表面高程变化、重力变化、表面速度和表面累积率的快照。该项目依赖于观测分析和建模之间的强相互作用，以将冰质量贡献与冰后期均衡反弹的贡献分开，将冰盖动态变化与年际表面质量平衡变化分开，并将长期冰动力变化与短期流量波动分开。其结果将是更好地估计格陵兰冰盖目前对全球海平面变化的影响，并更好地了解对目前冰量变化的各种影响及其相关的不确定性。