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DOI	10.5194/tc-12-2545-2018
	The role of subtemperate slip in thermally driven ice stream margin migration
	Haseloff M.; Schoof C.; Gagliardini O.
发表日期	2018
ISSN	19940416
卷号	12 期号:8
英文摘要	The amount of ice discharged by an ice stream depends on its width, and the widths of unconfined ice streams such as the Siple Coast ice streams in West Antarctica have been observed to evolve on decadal to centennial timescales. Thermally driven widening of ice streams provides a mechanism for this observed variability through melting of the frozen beds of adjacent ice ridges. This widening is driven by the heat dissipation in the ice stream margin, where strain rates are high, and at the bed of the ice ridge, where subtemperate sliding is possible. The inflow of cold ice from the neighboring ice ridges impedes ice stream widening. Determining the migration rate of the margin requires resolving conductive and advective heat transfer processes on very small scales in the ice stream margin, and these processes cannot be resolved by large-scale ice sheet models. Here, we exploit the thermal boundary layer structure in the ice stream margin to investigate how the migration rate depends on these different processes. We derive a parameterization of the migration rate in terms of parameters that can be estimated from observations or large-scale model outputs, including the lateral shear stress in the ice stream margin, the ice thickness of the stream, the influx of ice from the ridge, and the bed temperature of the ice ridge. This parameterization will allow the incorporation of ice stream margin migration into large-scale ice sheet models. © 2018 Copernicus GmbH. All rights reserved.
学科领域	boundary layer; dissipation; heat transfer; ice margin; ice sheet; ice stream; ice thickness; inflow; melting; parameterization; shear stress; Antarctica; Siple Coast; West Antarctica
语种	英语
scopus关键词	boundary layer; dissipation; heat transfer; ice margin; ice sheet; ice stream; ice thickness; inflow; melting; parameterization; shear stress; Antarctica; Siple Coast; West Antarctica
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119090
作者单位	Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ 08540, United States; Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Univ. Grenoble Alpes, CNRS, IGE, Grenoble, 38000, France; Department of Earth Sciences, University of Oxford, Oxford, OX1 3QR, United Kingdom
推荐引用方式 GB/T 7714	Haseloff M.,Schoof C.,Gagliardini O.. The role of subtemperate slip in thermally driven ice stream margin migration[J],2018,12(8).
APA	Haseloff M.,Schoof C.,&Gagliardini O..(2018).The role of subtemperate slip in thermally driven ice stream margin migration.Cryosphere,12(8).
MLA	Haseloff M.,et al."The role of subtemperate slip in thermally driven ice stream margin migration".Cryosphere 12.8(2018).