DOI: 10.1002/2016GL069937
论文题名: Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier
作者: Gillet-Chaulet F. ; Durand G. ; Gagliardini O. ; Mosbeux C. ; Mouginot J. ; Rémy F. ; Ritz C.
刊名: Geophysical Research Letters
ISSN: 0094-8569
EISSN: 1944-8300
出版年: 2016
卷: 43, 期: 19 起始页码: 10311
结束页码: 10321
语种: 英语
英文关键词: ice flow modeling
; inverse modeling
; subglacial conditions
Scopus关键词: Catchments
; Ice
; Inverse problems
; Constrained parameters
; Dynamical perturbations
; External forcing
; Ice-flow models
; Inverse modeling
; Pine island glaciers
; Stress exponents
; Subglacial conditions
; Friction
英文摘要: In ice-sheet models, slip conditions at the base between the ice and the bed are parameterized by a friction law. The most common relation has two poorly constrained parameters, C and m. The basal slipperiness coefficient, C, depends on local unobserved quantities and is routinely inferred using inverse methods. While model results have shown that transient responses to external forcing are highly sensitive to the stress exponent m, no consensus value has emerged, with values commonly used ranging from 1 to ∞ depending on the slip processes. By assimilation of Pine Island Glacier surface velocities from 1996 to 2010, we show that observed accelerations are best reproduced with m≥5. We conclude that basal motion, in much of the fast flowing region, is governed by plastic deformation of the underlying sediments. This implies that the glacier bed in this area cannot deliver resistive stresses higher than today, making the drainage basin potentially more sensitive to dynamical perturbations than predicted with models using standard values m = 1 or 3. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992390915&doi=10.1002%2f2016GL069937&partnerID=40&md5=563212995ed0bb00230298838dd55981
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9532
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: University of Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France
Recommended Citation:
Gillet-Chaulet F.,Durand G.,Gagliardini O.,et al. Assimilation of surface velocities acquired between 1996 and 2010 to constrain the form of the basal friction law under Pine Island Glacier[J]. Geophysical Research Letters,2016-01-01,43(19).