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.

该项目的目标是通过结合观测数据和冰川模型，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综合三维热机械冰盖模型、地表融化和径流模型以及计算平衡速度的模型，并进一步输入区域大气气候模型和粘弹性自重力固体地球模型。该模型将主要产生过去几十年的长期冰盖和基岩演化以及地表质量平衡。观测数据来自GRACE的时间相关大地水准面、ICESat和ERS-1/ERS-2/ENVISAT的高度测量、ASTER的光学数据、ERS-1/2、ENVISAT和TerraSAR的SAR数据以及地面GPS数据。这些数据将提供测量平台运行期间表面高程变化、重力变化、表面速度和表面积累率的快照。该项目依靠观测分析和建模之间的强大相互作用，将冰质量贡献与冰后均衡回弹的贡献分开，将冰盖动态变化与年际表面质量平衡变化分开，并将长期冰动态变化与短期流量分开 波动。其结果将是对格陵兰冰盖目前对全球海平面变化的贡献进行更好的估计，并更好地了解对当前冰块变化的各种贡献及其相关的不确定性。