| DOI: | 10.1002/2014GL062248
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| 论文题名: | Traveling slippery patches produce thickness-scale folds in ice sheets |
| 作者: | Wolovick M.J.; Creyts T.T.; Buck W.R.; Bell R.E.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9431
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| EISSN: | 1944-9162
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| 出版年: | 2014
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| 卷: | 41, 期:24 | | 起始页码: | 8895
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| 结束页码: | 8901
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| 语种: | 英语
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| 英文关键词: | basal freeze-on
; basal hydrology
; ice cores
; ice dynamics
; ice sheet stratigraphy
; ice sheets
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| Scopus关键词: | Deformation
; Glaciers
; Stratigraphy
; Basal conditions
; Basal freeze-on
; Ice core
; Ice dynamics
; Ice sheet
; Ice sheet models
; Overturned structure
; Thermo-mechanical
; Ice
; basal ice
; hydrology
; ice sheet
; ice thickness
; numerical model
; slip
; temporal variation
; thermomechanics
; Antarctica
; Arctic
; Greenland
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| 英文摘要: | Large, complex stratigraphic folds that rise as high as 60% of the local ice thickness have been observed in ice sheets on Antarctica and Greenland. Here we show that ice deformation caused by heterogeneous and time-variable basal sliding can produce the observed structures. We do this using a thermomechanical ice sheet model in which sliding occurs when the base approaches the melting point and slippery patches develop. These slippery patches emerge and travel downstream because of a feedback between ice deformation, vertical flow, and temperature. Our model produces the largest overturned structures, comparable to observations, when the patches move at about the ice column velocity. We conclude that the history of basal slip conditions is recorded in the ice sheet strata. These basal conditions appear to be dynamic and heterogeneous even in the slow-flowing interior regions of large ice sheets. Key Points Slippery patches beneath ice sheets propagate downstreamPropagating slippery patches create massive stratigraphic structuresThe internal structure of ice sheets is related to the history of basal slip ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921860639&doi=10.1002%2f2014GL062248&partnerID=40&md5=a538f0298ec23faef32c05be67b21d93
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| Citation statistics: |
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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/6695
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States
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| Recommended Citation: | |
Wolovick M.J.,Creyts T.T.,Buck W.R.,et al. Traveling slippery patches produce thickness-scale folds in ice sheets[J]. Geophysical Research Letters,2014-01-01,41(24).
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