气候变化领域集成服务门户(CCPortal): Insights into ice stream dynamics through modelling their response to tidal forcing

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DOI	10.5194/tc-8-1763-2014
	Insights into ice stream dynamics through modelling their response to tidal forcing
	Rosier S.H.R.; Gudmundsson G.H.; Green J.A.M.
发表日期	2014
ISSN	19940416
卷号	8 期号:5
英文摘要	The tidal forcing of ice streams at their ocean boundary can serve as a natural experiment to gain an insight into their dynamics and constrain the basal sliding law. A nonlinear 3-D viscoelastic full Stokes model of coupled ice stream ice shelf flow is used to investigate the response of ice streams to ocean tides. In agreement with previous results based on flow-line modelling and with a fixed grounding line position, we find that a nonlinear basal sliding law can qualitatively reproduce long-period modulation of tidal forcing found in field observations. In addition, we show that the inclusion of lateral drag, or allowing the grounding line to migrate over the tidal cycle, does not affect these conclusions. Further analysis of modelled ice stream flow shows a varying stress-coupling length scale of boundary effects upstream of the grounding line. We derive a viscoelastic stress-coupling length scale from ice stream equations that depends on the forcing period and closely agrees with model output. © 2014 Author(s).
学科领域	basal flow; flow modeling; ice flow; ice stream; nonlinearity; ocean tide; sliding; Stokes formula; stress analysis; tidal cycle; viscoelasticity
语种	英语
scopus关键词	basal flow; flow modeling; ice flow; ice stream; nonlinearity; ocean tide; sliding; Stokes formula; stress analysis; tidal cycle; viscoelasticity
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/120051
作者单位	School of Ocean Sciences, Bangor University, Menai Bridge, LL595AB, United Kingdom; British Antarctic Survey, High Cross, Madingley Rd., Cambridge, CB30ET, United Kingdom
推荐引用方式 GB/T 7714	Rosier S.H.R.,Gudmundsson G.H.,Green J.A.M.. Insights into ice stream dynamics through modelling their response to tidal forcing[J],2014,8(5).
APA	Rosier S.H.R.,Gudmundsson G.H.,&Green J.A.M..(2014).Insights into ice stream dynamics through modelling their response to tidal forcing.Cryosphere,8(5).
MLA	Rosier S.H.R.,et al."Insights into ice stream dynamics through modelling their response to tidal forcing".Cryosphere 8.5(2014).