气候变化领域集成服务门户(CCPortal): Sliding Relations for Glacier Slip With Cavities Over Three-Dimensional Beds

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DOI	10.1029/2019GL084924
	Sliding Relations for Glacier Slip With Cavities Over Three-Dimensional Beds
	Helanow C.; Iverson N.R.; Zoet L.K.; Gagliardini O.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	Results of glacier flow models and associated estimates of future sea level rise depend sensitively on the prescribed relation between shear stress and slip velocity at the glacier bed. Using a fully three-dimensional numerical model of ice flow, we compute steady-state sliding relations for where ice slips over a rock bed with three-dimensional, periodic topography. In agreement with studies of two-dimensional beds, water-filled cavities that form down-glacier from bedforms cause basal shear stress to peak at a threshold slip velocity and decrease at higher velocities (i.e., rate-weakening drag). However, the shear stress magnitude and extent of rate-weakening drag depend systematically on lateral topographic variations not considered previously. Moreover, steep up-glacier-facing slopes of bedforms can result in shear stress that increases monotonically over a wide range of slip velocity, helping to stabilize slip. These results highlight the potential variability of sliding relations and their likely sensitivity to the morphological diversity of glacier beds. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Drag; Sea level; Shear stress; Topography; Velocity; Basal shear stress; Glacier flow; Morphological diversity; Sea level rise; Shear stress magnitudes; Slip velocity; Three-dimensional numerical modeling; Water-filled cavities; Shear flow
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170737
作者单位	Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA, United States; Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States; Univ. Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France
推荐引用方式 GB/T 7714	Helanow C.,Iverson N.R.,Zoet L.K.,et al. Sliding Relations for Glacier Slip With Cavities Over Three-Dimensional Beds[J],2020,47(3).
APA	Helanow C.,Iverson N.R.,Zoet L.K.,&Gagliardini O..(2020).Sliding Relations for Glacier Slip With Cavities Over Three-Dimensional Beds.Geophysical Research Letters,47(3).
MLA	Helanow C.,et al."Sliding Relations for Glacier Slip With Cavities Over Three-Dimensional Beds".Geophysical Research Letters 47.3(2020).