On mechanisms of calving from Antarctic ice shelves

南极冰架崩解机制

• 批准号: 198534210
• 负责人: Professor Dr.-Ing. Ralf Müller, since 2/2014
• 金额: --
• 依托单位: Fachgebiet Kontinuumsmechanik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198534210?language=en
• 关键词: mechanisms; calving; Antarctic; ice; shelves

This project aims to investigate the mechanisms of calving of tabular icebergs from Antarctic ice shelves. Calving is the final consequence of a fracture propagating through an ice shelf, which also behaves as a viscous material. Thus we will apply ice flow dynamical concepts in conjunction with fracture mechanical approaches. Theoretical investigations and numerical simulations lead to a formulation and determination of calving rates. Therefore, two and three dimensional finite element models will be developed, with which sensitivity studies and prognostic simulations will be carried out. The dependency of the mechanisms, and thus the calving rate, on typical geometrical setups, external forcing and material parameters is evaluated. Calving rates are crucial for the evolution of the position of the ice front. The knowledge of appropriate calving rates is required to predict the changes of the extent of the Antarctic ice sheet.

该项目旨在研究南极冰架板状冰山的崩解机制。断裂是裂缝通过冰架传播的最终结果，冰架也表现为粘性材料。因此，我们将应用冰流动力学的概念结合断裂力学的方法。理论研究和数值模拟导致制定和确定产犊率。因此，将开发二维和三维有限元模型，进行敏感性研究和预测模拟。的依赖性的机制，从而产犊率，对典型的几何设置，外部迫使和材料参数进行评估。产犊率对冰锋位置的演变至关重要。需要适当的产犊率的知识来预测南极冰盖范围的变化。

项目成果

Measurement of the fracture toughness of polycrystalline bubbly ice from an Antarctic ice core

南极冰芯多晶气泡冰断裂韧性的测量

• DOI: 10.5194/essd-7-87-2015
• 发表时间: 2015
• 期刊: Earth System Science Data
• 影响因子: 11.4
• 作者: Christmann;Müller;Webber;Schader;Kipfstuhl;Freitag;Humbert
• 通讯作者: Humbert

Viscous and viscoelastic stress states at the calving front of Antarctic ice shelves

南极冰架崩解前沿的粘性和粘弹性应力状态

• DOI: 10.1017/aog.2016.18
• 发表时间: 2016
• 期刊: Annals of Glaciology
• 影响因子: 2.9
• 作者: Christmann;Müller;Humbert
• 通讯作者: Humbert

On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica

南极洲杰尔巴特冰架表面和基底结构之间的联系

• DOI: 10.3189/2015jog15j023
• 发表时间: 2015
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: Humbert;Steinhage;Berendt;Leipprand;Christmann;Müller
• 通讯作者: Müller

A Law for Small Scale, Continuous Calving

小规模连续产犊法则

• DOI: 10.1002/pamm.201410203
• 发表时间: 2014
• 期刊: PAMM
• 作者: Christmann;Müller;Humbert
• 通讯作者: Humbert

Discussion of Different Model Approaches for the Flow Behavior of Ice

冰流动行为不同模型方法的讨论

• DOI: 10.1002/pamm.201610145
• 发表时间: 2016
• 期刊: PAMM
• 作者: Christmann;Rückamp;Müller;Humbert
• 通讯作者: Humbert