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Tidal Grounding-Line Migration Modulated by Subglacial Hydrology

Warburton, KLP; Hewitt, DR; Neufeld, JA; (2020) Tidal Grounding-Line Migration Modulated by Subglacial Hydrology. Geophysical Research Letters , 47 (17) , Article e2020GL089088. 10.1029/2020GL089088. Green open access

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Abstract

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.

Type: Article
Title: Tidal Grounding-Line Migration Modulated by Subglacial Hydrology
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2020GL089088
Publisher version: https://doi.org/10.1029/2020GL089088
Language: English
Additional information: ©2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics
URI: https://discovery.ucl.ac.uk/id/eprint/10111178
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