气候变化领域集成服务门户(CCPortal): Modelled fracture and calving on the Totten Ice Shelf

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DOI	10.5194/tc-12-2401-2018
	Modelled fracture and calving on the Totten Ice Shelf
	Cook S.; Åström J.; Zwinger T.; Keith Galton-Fenzi B.; Stevens Greenbaum J.; Coleman R.
发表日期	2018
ISSN	19940416
卷号	12 期号:7
英文摘要	The Totten Ice Shelf (IS) has a large drainage basin, much of which is grounded below sea level, leaving the glacier vulnerable to retreat through the marine ice sheet instability mechanism. The ice shelf has also been shown to be sensitive to changes in calving rate, as a very small retreat of the calving front from its current position is predicted to cause a change in flow at the grounding line. Therefore understanding the processes behind calving on the Totten IS is key to predicting its future sea level rise contribution. Here we use the Helsinki Discrete Element Model (HiDEM) to show that not all of the fractures visible at the front of the Totten IS are produced locally, but that the across-flow basal crevasses, which are part of the distinctive cross-cutting fracture pattern, are advected into the calving front area from upstream. A separate simulation of the grounding line shows that re-grounding points may be key areas of basal crevasse production, and can produce basal crevasses in both an along- A nd across-flow orientation. The along-flow basal crevasses at the grounding line may be a possible precursor to basal channels, while we suggest the across-flow grounding-line fractures are the source of the across-flow features observed at the calving front. We use two additional models to simulate the evolution of basal fractures as they advect downstream, demonstrating that both strain and ocean melt have the potential to deform narrow fractures into the broad basal features observed near the calving front. The wide range of factors which influence fracture patterns and calving on this glacier will be a challenge for predicting its future mass loss. © 2018 Author(s).
学科领域	crevasse; glacier; grounding line; ice flow; ice retreat; ice sheet; iceberg calving; sea level change; Antarctica; East Antarctica; Totten Glacier
语种	英语
scopus关键词	crevasse; glacier; grounding line; ice flow; ice retreat; ice sheet; iceberg calving; sea level change; Antarctica; East Antarctica; Totten Glacier
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/119098
作者单位	Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, TAS 7001, Australia; CSC, IT Center for Science Ltd., Espoo, 02101, Finland; Australian Antarctic Division, Kingston, TAS 7050, Australia; Institute for Geophysics, University of Texas at Austin, Austin, TX 78758, United States; Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia
推荐引用方式 GB/T 7714	Cook S.,Åström J.,Zwinger T.,et al. Modelled fracture and calving on the Totten Ice Shelf[J],2018,12(7).
APA	Cook S.,Åström J.,Zwinger T.,Keith Galton-Fenzi B.,Stevens Greenbaum J.,&Coleman R..(2018).Modelled fracture and calving on the Totten Ice Shelf.Cryosphere,12(7).
MLA	Cook S.,et al."Modelled fracture and calving on the Totten Ice Shelf".Cryosphere 12.7(2018).