气候变化领域集成服务门户(CCPortal): Modelled subglacial floods and tunnel valleys control the life cycle of transitory ice streams

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DOI	10.5194/tc-12-2759-2018
	Modelled subglacial floods and tunnel valleys control the life cycle of transitory ice streams
	Lelandais T.; Ravier E.; Pochat S.; Bourgeois O.; Clark C.; Mourgues R.; Strzerzynski P.
发表日期	2018
ISSN	19940416
卷号	12 期号:8
英文摘要	Ice streams are corridors of fast-flowing ice that control mass transfers from continental ice sheets to oceans. Their flow speeds are known to accelerate and decelerate, their activity can switch on and off, and even their locations can shift entirely. Our analogue physical experiments reveal that a life cycle incorporating evolving subglacial meltwater routing and bed erosion can govern this complex transitory behaviour. The modelled ice streams switch on and accelerate when subglacial water pockets drain as marginal outburst floods (basal decoupling). Then they decelerate when the lubricating water drainage system spontaneously organizes itself into channels that create tunnel valleys (partial basal recoupling). The ice streams surge or jump in location when these water drainage systems maintain low discharge but they ultimately switch off when tunnel valleys have expanded to develop efficient drainage systems. Beyond reconciling previously disconnected observations of modern and ancient ice streams into a single life cycle, the modelling suggests that tunnel valley development may be crucial in stabilizing portions of ice sheets during periods of climate change. © 2018. Author(s).
学科领域	climate change; drainage basin; flash flood; flood; ice flow; ice sheet; ice stream; mass transfer; meltwater; subglacial environment
语种	英语
scopus关键词	climate change; drainage basin; flash flood; flood; ice flow; ice sheet; ice stream; mass transfer; meltwater; subglacial environment
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/119079
作者单位	Laboratoire de Planétologie et Géodynamique, UMR 6112, CNRS, Le Mans Université, Avenue Olivier Messiaen, Le Mans Cedex 9, 72085, France; Laboratoire de Planétologie et Géodynamique, UMR 6112, CNRS, Université de Nantes, 2 rue de la Houssinière, Nantes Cedex 3, 44322, France; Department of Geography, University of Sheffield, Sheffield, United Kingdom
推荐引用方式 GB/T 7714	Lelandais T.,Ravier E.,Pochat S.,et al. Modelled subglacial floods and tunnel valleys control the life cycle of transitory ice streams[J],2018,12(8).
APA	Lelandais T..,Ravier E..,Pochat S..,Bourgeois O..,Clark C..,...&Strzerzynski P..(2018).Modelled subglacial floods and tunnel valleys control the life cycle of transitory ice streams.Cryosphere,12(8).
MLA	Lelandais T.,et al."Modelled subglacial floods and tunnel valleys control the life cycle of transitory ice streams".Cryosphere 12.8(2018).