气候变化领域集成服务门户(CCPortal): Persistence and variability of ice-stream grounding lines on retrograde bed slopes

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DOI	10.5194/tc-10-1883-2016
	Persistence and variability of ice-stream grounding lines on retrograde bed slopes
	Robel A.A.; Schoof C.; Tziperman E.
发表日期	2016
ISSN	19940416
卷号	10 期号:4
英文摘要	In many ice streams, basal resistance varies in space and time due to the dynamically evolving properties of subglacial till. These variations can cause internally generated oscillations in ice-stream flow. However, the potential for such variations in basal properties is not considered by conventional theories of grounding-line stability on retrograde bed slopes, which assume that bed properties are static in time. Using a flow-line model, we show how internally generated, transient variations in ice-stream state interact with retrograde bed slopes. In contrast to predictions from the theory of the marine ice-sheet instability, our simulated grounding line is able to persist and reverse direction of migration on a retrograde bed when undergoing oscillations in the grounding-line position. In turn, the presence of a retrograde bed may also suppress or reduce the amplitude of internal oscillations in ice-stream state. We explore the physical mechanisms responsible for these behaviors and discuss the implications for observed grounding-line migration in West Antarctica. © 2016 Author(s).
学科领域	grounding line; ice stream; numerical model; oscillation; persistence; spatiotemporal analysis; subglacial environment; Antarctica; West Antarctica
语种	英语
scopus关键词	grounding line; ice stream; numerical model; oscillation; persistence; spatiotemporal analysis; subglacial environment; Antarctica; 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/119596
作者单位	Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, BC, Canada; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Department of the Geophysical Sciences, University of Chicago, Chicago, IL, United States
推荐引用方式 GB/T 7714	Robel A.A.,Schoof C.,Tziperman E.. Persistence and variability of ice-stream grounding lines on retrograde bed slopes[J],2016,10(4).
APA	Robel A.A.,Schoof C.,&Tziperman E..(2016).Persistence and variability of ice-stream grounding lines on retrograde bed slopes.Cryosphere,10(4).
MLA	Robel A.A.,et al."Persistence and variability of ice-stream grounding lines on retrograde bed slopes".Cryosphere 10.4(2016).