The role of basal hydrology in the surging of the Laurentide Ice Sheet
We use the Glimmer ice sheet model to simulate periodic surges over the Laurentide Ice Sheet during the Last Glacial Maximum. In contrast to previous studies we use the depth of water at the base of the ice sheet as the switch for these surges. We find that the surges are supported within the model...
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Format: | Article in Journal/Newspaper |
Language: | English |
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European Geosciences Union
2016
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/35262/ https://doi.org/10.5194/cp-12-1601-2016 https://nrl.northumbria.ac.uk/id/eprint/35262/1/Role%20of%20basal%20hydrology.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:35262 2023-05-15T16:35:39+02:00 The role of basal hydrology in the surging of the Laurentide Ice Sheet Roberts, William Payne, Antony Valdes, Paul 2016-08-03 text https://nrl.northumbria.ac.uk/id/eprint/35262/ https://doi.org/10.5194/cp-12-1601-2016 https://nrl.northumbria.ac.uk/id/eprint/35262/1/Role%20of%20basal%20hydrology.pdf en eng European Geosciences Union https://nrl.northumbria.ac.uk/id/eprint/35262/1/Role%20of%20basal%20hydrology.pdf Roberts, William, Payne, Antony and Valdes, Paul (2016) The role of basal hydrology in the surging of the Laurentide Ice Sheet. Climate of the Past, 12 (8). pp. 1601-1617. ISSN 1814-9332 cc_by CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2016 ftunivnorthumb https://doi.org/10.5194/cp-12-1601-2016 2022-09-25T06:07:47Z We use the Glimmer ice sheet model to simulate periodic surges over the Laurentide Ice Sheet during the Last Glacial Maximum. In contrast to previous studies we use the depth of water at the base of the ice sheet as the switch for these surges. We find that the surges are supported within the model and are quite robust across a very wide range of parameter choices, in contrast to many previous studies where surges only occur for rather specific cases. The robustness of the surges is likely due to the use of water as the switch mechanism for sliding. The statistics of the binge–purge cycles resemble observed Heinrich events. The events have a period of between 10 and 15 thousand years and can produce fluxes of ice from the mouth of Hudson Strait of 0.05 Sv – a maximum flux of 0.06 Sv is possible. The events produce an ice volume of 2.50 × 106 km3, with a range of 4.30 × 106–1.90 × 106 km3 possible. We undertake a suite of sensitivity tests varying the sliding parameter, the water drainage scheme, the sliding versus water depth parameterisation and the resolution, all of which support the ice sheet surges. This suggests that internally triggered ice sheet surges were a robust feature of the Laurentide Ice Sheet and are a possible explanation for the observed Heinrich events. Article in Journal/Newspaper Hudson Strait Ice Sheet Northumbria University, Newcastle: Northumbria Research Link (NRL) Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Climate of the Past 12 8 1601 1617 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Roberts, William Payne, Antony Valdes, Paul The role of basal hydrology in the surging of the Laurentide Ice Sheet |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
We use the Glimmer ice sheet model to simulate periodic surges over the Laurentide Ice Sheet during the Last Glacial Maximum. In contrast to previous studies we use the depth of water at the base of the ice sheet as the switch for these surges. We find that the surges are supported within the model and are quite robust across a very wide range of parameter choices, in contrast to many previous studies where surges only occur for rather specific cases. The robustness of the surges is likely due to the use of water as the switch mechanism for sliding. The statistics of the binge–purge cycles resemble observed Heinrich events. The events have a period of between 10 and 15 thousand years and can produce fluxes of ice from the mouth of Hudson Strait of 0.05 Sv – a maximum flux of 0.06 Sv is possible. The events produce an ice volume of 2.50 × 106 km3, with a range of 4.30 × 106–1.90 × 106 km3 possible. We undertake a suite of sensitivity tests varying the sliding parameter, the water drainage scheme, the sliding versus water depth parameterisation and the resolution, all of which support the ice sheet surges. This suggests that internally triggered ice sheet surges were a robust feature of the Laurentide Ice Sheet and are a possible explanation for the observed Heinrich events. |
format |
Article in Journal/Newspaper |
author |
Roberts, William Payne, Antony Valdes, Paul |
author_facet |
Roberts, William Payne, Antony Valdes, Paul |
author_sort |
Roberts, William |
title |
The role of basal hydrology in the surging of the Laurentide Ice Sheet |
title_short |
The role of basal hydrology in the surging of the Laurentide Ice Sheet |
title_full |
The role of basal hydrology in the surging of the Laurentide Ice Sheet |
title_fullStr |
The role of basal hydrology in the surging of the Laurentide Ice Sheet |
title_full_unstemmed |
The role of basal hydrology in the surging of the Laurentide Ice Sheet |
title_sort |
role of basal hydrology in the surging of the laurentide ice sheet |
publisher |
European Geosciences Union |
publishDate |
2016 |
url |
https://nrl.northumbria.ac.uk/id/eprint/35262/ https://doi.org/10.5194/cp-12-1601-2016 https://nrl.northumbria.ac.uk/id/eprint/35262/1/Role%20of%20basal%20hydrology.pdf |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Hudson Hudson Strait |
geographic_facet |
Hudson Hudson Strait |
genre |
Hudson Strait Ice Sheet |
genre_facet |
Hudson Strait Ice Sheet |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/35262/1/Role%20of%20basal%20hydrology.pdf Roberts, William, Payne, Antony and Valdes, Paul (2016) The role of basal hydrology in the surging of the Laurentide Ice Sheet. Climate of the Past, 12 (8). pp. 1601-1617. ISSN 1814-9332 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-12-1601-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
8 |
container_start_page |
1601 |
op_container_end_page |
1617 |
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1766025919829377024 |