Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL084896 |
Effective Rheology Across the Fragmentation Transition for Sea Ice and Ice Shelves | |
Astroem, J. A.1; Benn, D. I.2 | |
2019-11-20 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:22页码:13099-13106 |
文章类型 | Article |
语种 | 英语 |
国家 | Finland; Scotland |
英文摘要 | Sea ice and ice shelves can be described by a viscoelastic rheology that is approximately linear elastic and brittle at high strain rates and viscously shear thinning at low strain rates. Brittle ice easily fractures under compressive shear and forms shear bands as the material undergoes a transition to a fragmented, granular state. This transition plays a central role in the mechanical behavior at large scales of sea ice in the Arctic Ocean or Antarctic ice shelves. Here we demonstrate that the fragmentation transition is characterized by an essentially discontinuous drop of three to five orders of magnitude in effective viscosity and stress relaxation time. Beyond the fragmentation transition, grinding in shear zones further reduces both effective viscosity and shear stiffness, but with an essentially constant relaxation time of similar to 10 s. These results are relevant for ice rheology implementation in large-scale climate-related models of sea ice and thin ice shelves. |
英文关键词 | ice shelves sea ice modeling |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000497261400001 |
WOS关键词 | DISCRETE-ELEMENT ; FRACTURE ; DEFORMATION ; MODEL ; SUSPENSIONS ; MECHANICS ; UNDERSIDE ; GLACIERS ; DRIVEN ; CREEP |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/225061 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.CSC IT Ctr Sci, Espoo, Finland; 2.Univ St Andrews, Sch Geog & Sustainable Dev, St Andrews, Fife, Scotland |
推荐引用方式 GB/T 7714 | Astroem, J. A.,Benn, D. I.. Effective Rheology Across the Fragmentation Transition for Sea Ice and Ice Shelves[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(22):13099-13106. |
APA | Astroem, J. A.,&Benn, D. I..(2019).Effective Rheology Across the Fragmentation Transition for Sea Ice and Ice Shelves.GEOPHYSICAL RESEARCH LETTERS,46(22),13099-13106. |
MLA | Astroem, J. A.,et al."Effective Rheology Across the Fragmentation Transition for Sea Ice and Ice Shelves".GEOPHYSICAL RESEARCH LETTERS 46.22(2019):13099-13106. |
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