DOI: 10.1002/2013GL057447
论文题名: Ice sheet grounding zone stabilization due to till compaction
作者: Christianson K. ; Parizek B.R. ; Alley R.B. ; Horgan H.J. ; Jacobel R.W. ; Anandakrishnan S. ; Keisling B.A. ; Craig B.D. ; Muto A.
刊名: Geophysical Research Letters
ISSN: 0094-8455
EISSN: 1944-8186
出版年: 2013
卷: 40, 期: 20 起始页码: 5406
结束页码: 5411
语种: 英语
英文关键词: glacier dynamics
; ice shelf
; ice stream
; radio-echo sounding
; subglacial hydrology
; tidal flexure
Scopus关键词: Glacier dynamics
; Ice shelves
; Ice streams
; Radio-echo sounding
; Subglacial hydrology
; tidal flexure
; Compaction
; Friction
; Glacial geology
; Models
; Radar
; Radio systems
; Shear stress
; Ice
; compaction
; echo sounding
; glacial hydrology
; glacier dynamics
; GPS
; grounding line
; ice sheet
; ice shelf
; ice stream
; radar
; shear stress
; stabilization
; subglacial environment
; tidewater glacier
; till
; Antarctica
; West Antarctic Ice Sheet
; West Antarctica
; Whillans Ice Stream
英文摘要: Based on modeling motivated by new GPS and radio-echo sounding surveys, a few-kilometers-long zone of Whillans Ice Stream, West Antarctica, just inland of the grounding line has higher basal shear stress than the ice farther upstream or the freely slipping ice shelf downstream. Data from this zone show a few-meter-high upwarp of the surface overlying a large fold extending through all internal radar layers observed. Flowband modeling shows that the fold can be generated by decreased basal lubrication beneath the upwarp. Basal topography alone cannot create this fold. Physical modeling and available data suggest that low-amplitude tidal flexure of the ice shelf extends a few kilometers inland. Downward flexing of this grounded ice from the rising tide would compact subglacial till, resulting in higher basal shear stress. This result suggests that important processes influencing grounding line stability are not included in modern whole-ice-sheet models. Key Points Radar data depict the grounding line and associated internal layer folding Fold in radar internal layers can be explained by enhanced basal friction Enhanced friction is likely due to till compaction from tidal flexure ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885558860&doi=10.1002%2f2013GL057447&partnerID=40&md5=d44d4b9e00f52412194e3974bd7b9e10
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5719
Appears in Collections: 气候减缓与适应
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作者单位: Physics Department, St. Olaf College, Northfield, MN, United States
Recommended Citation:
Christianson K.,Parizek B.R.,Alley R.B.,et al. Ice sheet grounding zone stabilization due to till compaction[J]. Geophysical Research Letters,2013-01-01,40(20).