Tidal Grounding-Line Migration Modulated by Subglacial Hydrology
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...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10111178 2023-12-24T10:08:39+01:00 Tidal Grounding-Line Migration Modulated by Subglacial Hydrology Warburton, KLP Hewitt, DR Neufeld, JA 2020-09-16 text https://discovery.ucl.ac.uk/id/eprint/10111178/1/2020GL089088.pdf https://discovery.ucl.ac.uk/id/eprint/10111178/ eng eng https://discovery.ucl.ac.uk/id/eprint/10111178/1/2020GL089088.pdf https://discovery.ucl.ac.uk/id/eprint/10111178/ open Geophysical Research Letters , 47 (17) , Article e2020GL089088. (2020) Article 2020 ftucl 2023-11-27T13:07:29Z 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. Article in Journal/Newspaper Antarc* Antarctica University College London: UCL Discovery |
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Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Warburton, KLP Hewitt, DR Neufeld, JA |
spellingShingle |
Warburton, KLP Hewitt, DR Neufeld, JA Tidal Grounding-Line Migration Modulated by Subglacial Hydrology |
author_facet |
Warburton, KLP Hewitt, DR Neufeld, JA |
author_sort |
Warburton, KLP |
title |
Tidal Grounding-Line Migration Modulated by Subglacial Hydrology |
title_short |
Tidal Grounding-Line Migration Modulated by Subglacial Hydrology |
title_full |
Tidal Grounding-Line Migration Modulated by Subglacial Hydrology |
title_fullStr |
Tidal Grounding-Line Migration Modulated by Subglacial Hydrology |
title_full_unstemmed |
Tidal Grounding-Line Migration Modulated by Subglacial Hydrology |
title_sort |
tidal grounding-line migration modulated by subglacial hydrology |
publishDate |
2020 |
url |
https://discovery.ucl.ac.uk/id/eprint/10111178/1/2020GL089088.pdf https://discovery.ucl.ac.uk/id/eprint/10111178/ |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Geophysical Research Letters , 47 (17) , Article e2020GL089088. (2020) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10111178/1/2020GL089088.pdf https://discovery.ucl.ac.uk/id/eprint/10111178/ |
op_rights |
open |
_version_ |
1786202901881815040 |