气候变化领域集成服务门户(CCPortal): Simulated dynamic regrounding during marine ice sheet retreat

CCPortal

DOI	10.5194/tc-12-2425-2018
	Simulated dynamic regrounding during marine ice sheet retreat
	Jong L.M.; Gladstone R.M.; Galton-Fenzi B.K.; King M.A.
发表日期	2018
ISSN	19940416
卷号	12 期号:7
英文摘要	Marine-terminating ice sheets are of interest due to their potential instability, making them vulnerable to rapid retreat. Modelling the evolution of glaciers and ice streams in such regions is key to understanding their possible contribution to sea level rise. The friction caused by the sliding of ice over bedrock and the resultant shear stress are important factors in determining the velocity of sliding ice. Many models use simple power-law expressions for the relationship between the basal shear stress and ice velocity or introduce an effective-pressure dependence into the sliding relation in an ad hoc manner. Sliding relations based on water-filled subglacial cavities are more physically motivated, with the overburden pressure of the ice included. Here we show that using a cavitation-based sliding relation allows for the temporary regrounding of an ice shelf at a point downstream of the main grounding line of a marine ice sheet undergoing retreat across a retrograde bedrock slope. This suggests that the choice of sliding relation is especially important when modelling grounding line behaviour of regions where potential ice rises and pinning points are present and regrounding could occur. © Author(s) 2018.
学科领域	bedrock; grounding line; ice retreat; ice sheet; ice shelf; ice stream; marine environment; overburden; sea level change; shear stress; simulation
语种	英语
scopus关键词	bedrock; grounding line; ice retreat; ice sheet; ice shelf; ice stream; marine environment; overburden; sea level change; shear stress; simulation
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/119096
作者单位	Australian Antarctic Division, Channel Highway, Kingston, TAS 7050, Australia; Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, TAS 7001, Australia; Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia; Arctic Centre, University of Lapland, P.O. Box 122, Rovaniemi, 96101, Finland; School of Technology, Environments and Design, University of Tasmania, Hobart, 7001, Australia
推荐引用方式 GB/T 7714	Jong L.M.,Gladstone R.M.,Galton-Fenzi B.K.,et al. Simulated dynamic regrounding during marine ice sheet retreat[J],2018,12(7).
APA	Jong L.M.,Gladstone R.M.,Galton-Fenzi B.K.,&King M.A..(2018).Simulated dynamic regrounding during marine ice sheet retreat.Cryosphere,12(7).
MLA	Jong L.M.,et al."Simulated dynamic regrounding during marine ice sheet retreat".Cryosphere 12.7(2018).