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Study of the dynamic state of ice shelves on the south-western Antarctic Peninsula by an interdisciplinary approach of remote sensing, fracture mechanics and modelling of ice dynamics

利用遥感、断裂力学和冰动力学建模的跨学科方法研究南极半岛西南部冰架的动态

基本信息

批准号：
128368401
负责人：
Professor Dr. Matthias Holger Braun, since 3/2012
金额：
--
依托单位：
Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/128368401?language=en
关键词：
Study dynamic state ice shelves

项目摘要

This project aims to gain understanding of ongoing and potential changes of Wilkins and GeorgeVI ice shelves on the south-western Antarctic Peninsula. Both are located in an area of the supposed climatic limit of viability of ice shelves and have already shown considerable ice front retreat. The break-up events in 2008 on Wilkins Ice Shelf exemplified their potential of disintegration. We propose a multi-institutional, interdisciplinary approach including remote sensing, modelling of the ice dynamics and fracture mechanics with the aim to improve the understanding of the impacts of temperature increase on ice shelf stability. The remote sensing component will include the mapping of surface structures and fracture development over time for Wilkins Ice Shelf, as well as the derivation of surface velocity fields by SAR interferometry and feature tracking for both ice shelves, required as input datasets for modelling of fracture and ice dynamics. For this purpose, multi-temporal optical and SAR imagery will be used. The observed quantities will be interpreted in the context of ice dynamics and fracture mechanics. The glaciological modelling component includes a thermo-dynamical consistent dynamic model for ice shelf flow in shallow shelf approximation, which will be applied to both ice shelves. The model sensitivity to inflow speeds, thermal boundary conditions and grounded areas will be tested in order to gain understanding of the response to external changes. We specially focus on the incorporation of local features, e.g. rifts on Wilkins Ice Shelf, in the model. The fracture mechanic component of the project will focus on critical situations which damage the ice shelves and which lead to break-up events.

该项目旨在了解南极半岛西南部威尔金斯和乔治六世冰架正在发生的和潜在的变化。这两个地区都位于冰架生存能力的假定气候极限区域，并且已经显示出相当大的冰锋退缩。2008年在威尔金斯冰架上发生的分裂事件说明了它们解体的可能性。我们提出了一个多机构，跨学科的方法，包括遥感，冰动力学和断裂力学的建模，旨在提高对温度升高对冰架稳定性的影响的理解。遥感部分将包括绘制威尔金斯冰架表面结构和裂缝随时间推移的发展情况，以及通过合成孔径雷达干涉测量法推导出两个冰架的表面速度场和特征跟踪，这是裂缝和冰动态建模所需的输入数据集。为此目的，将使用多时光学和合成孔径雷达图像。观测到的量将在冰动力学和断裂力学的背景下进行解释。冰川学建模部分包括一个用于浅冰架近似冰架流动的热力学一致动态模型，该模型将适用于两个冰架。将测试模型对流入速度、热边界条件和接地面积的敏感性，以了解对外部变化的响应。我们特别注重纳入当地的功能，例如裂缝的威尔金斯冰架，在模型中。该项目的断裂力学部分将侧重于破坏冰架和导致破裂事件的关键情况。