| DOI: | 10.1038/ngeo1887
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| 论文题名: | Diverse calving patterns linked to glacier geometry |
| 作者: | Bassis J.N.; Jacobs S.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2013
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| 卷: | 6, 期:10 | | 起始页码: | 833
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| 结束页码: | 836
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| 语种: | 英语
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| Scopus关键词: | catastrophic event
; glacier dynamics
; glacier retreat
; ice mechanics
; ice sheet
; ice shelf
; iceberg calving
; numerical model
; Antarctica
; Arctic
; Greenland
; Greenland Ice Sheet
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| 英文摘要: | Iceberg calving has been implicated in the retreat and acceleration of glaciers and ice shelves along the margins of the Greenland and Antarctic ice sheets. Accurate projections of sea-level rise therefore require an understanding of how and why calving occurs. Unfortunately, calving is a complex process and previous models of the phenomenon have not reproduced the diverse patterns of iceberg calving observed in nature. Here we present a numerical model that simulates the disparate calving regimes observed, including the detachment of large tabular bergs from floating ice tongues, the disintegration of ice shelves and the capsizing of smaller bergs from grounded glaciers that terminate in deep water. Our model treats glacier ice as a granular material made of interacting boulders of ice that are bonded together. Simulations suggest that different calving regimes are controlled by glacier geometry, which controls the stress state within the glacier. We also find that calving is a two-stage process that requires both ice fracture and transport of detached icebergs away from the calving front. We suggest that, as a result, rapid iceberg discharge is possible in regions where highly crevassed glaciers are grounded deep beneath sea level, indicating portions of Greenland and Antarctica that may be vulnerable to rapid ice loss through catastrophic disintegration. © 2013 Macmillan Publishers Limited. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/106695
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48102, United States
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| Recommended Citation: | |
Bassis J.N.,Jacobs S.. Diverse calving patterns linked to glacier geometry[J]. Nature Geoscience,2013-01-01,6(10)
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