气候变化领域集成服务门户(CCPortal): Tidal Grounding-Line Migration Modulated by Subglacial Hydrology

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DOI	10.1029/2020GL089088
	Tidal Grounding-Line Migration Modulated by Subglacial Hydrology
	Warburton K.L.P.; Hewitt D.R.; Neufeld J.A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:17
英文摘要	We present a mathematical model of the hydrology of grounding-line migration on tidal timescales, in which the ice acts elastically, overlying a connected hydrological network, with the ocean tides modeled by an oscillating far-field fluid height. The upstream grounding-line migration is driven by a fluid pressure gradient through the grounding zone, while the downstream migration is limited by fluid drainage through the till. The two processes are described using separate travelling-wave solutions, based on a model of fluid flow under an elastic sheet. The asymmetry between the upstream and downstream motion allows the grounding line to act as a nonlinear filter on the tidal forcing as the pressure signal propagates upstream, and this frequency modulation is discussed in the context of velocity data from ice streams across Antarctica to provide a novel constraint on till permeability. ©2020. The Authors.
英文关键词	Data streams; Hydrology; Modulation; Elastic sheets; Fluid pressure gradient; Grounding line; Pressure signal; Subglacial hydrology; Tidal forcing; Time-scales; Travelling wave solution; Flow of fluids; fluid flow; fluid pressure; grounding line; hydrological regime; permeability; pressure gradient; sea ice; subglacial deposit; timescale; Antarctica
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169797
作者单位	Institute of Theoretical Geophysics, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, United Kingdom; Department of Mathematics, University College London, London, United Kingdom; BP Institute, University of Cambridge, Cambridge, United Kingdom; Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Warburton K.L.P.,Hewitt D.R.,Neufeld J.A.. Tidal Grounding-Line Migration Modulated by Subglacial Hydrology[J],2020,47(17).
APA	Warburton K.L.P.,Hewitt D.R.,&Neufeld J.A..(2020).Tidal Grounding-Line Migration Modulated by Subglacial Hydrology.Geophysical Research Letters,47(17).
MLA	Warburton K.L.P.,et al."Tidal Grounding-Line Migration Modulated by Subglacial Hydrology".Geophysical Research Letters 47.17(2020).