| DOI: | 10.5194/tc-14-1673-2020
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| 论文题名: | Ice shelf rift propagation: Stability, three-dimensional effects, and the role of marginal weakening |
| 作者: | Paul Lipovsky B.
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2020
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| 卷: | 14, 期:5 | | 起始页码: | 1673
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| 结束页码: | 1683
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| 语种: | 英语
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| 英文关键词: | floating ice
; fracture
; fracture mechanics
; ice drift
; ice flow
; ice margin
; ice shelf
; sea level change
; three-dimensional modeling
; Antarctica
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| 英文摘要: | Understanding the processes that govern ice shelf extent is important to improving estimates of future sea-level rise. In present-day Antarctica, ice shelf extent is most commonly determined by the propagation of through-cutting fractures called ice shelf rifts. Here, I present the first three-dimensional analysis of ice shelf rift propagation. I model rifts using the assumptions of linear elastic fracture mechanics (LEFM). The model predicts that rifts may be stabilized (i.e., stop propagating) when buoyant flexure results in the partial contact of rift walls. This stabilizing tendency may be overcome, however, by processes that act in the ice shelf margins. In particular, loss of marginal strength, modeled as a transition from zero tangential displacement to zero tangential shear stress, is shown to favor rift propagation. Rift propagation may also be triggered if a rift is carried with the ice flow (i.e., advected) out of an embayment and into a floating ice tongue. I show that rift stability is closely related to the transition from uniaxial to biaxial extension known as the compressive arch. Although the partial contact of rift walls is fundamentally a three-dimensional process, I demonstrate that it may be parameterized within more numerically efficient two-dimensional calculations. This study constitutes a step towards a first-principle description of iceberg calving due to ice shelf rift propagation. © 2020 Copernicus GmbH. All rights reserved. |
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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/164555
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| Appears in Collections: | 气候变化与战略
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作者单位: | Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
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| Recommended Citation: | |
Paul Lipovsky B.. Ice shelf rift propagation: Stability, three-dimensional effects, and the role of marginal weakening[J]. Cryosphere,2020-01-01,14(5)
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