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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ftcopernicus:oai:publications.copernicus.org:cp49683 2023-05-15T16:35:39+02:00 The role of basal hydrology in the surging of the Laurentide Ice Sheet Roberts, William H. G. Payne, Antony J. Valdes, Paul J. 2018-09-27 application/pdf https://doi.org/10.5194/cp-12-1601-2016 https://cp.copernicus.org/articles/12/1601/2016/ eng eng doi:10.5194/cp-12-1601-2016 https://cp.copernicus.org/articles/12/1601/2016/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-12-1601-2016 2020-07-20T16:24:03Z 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 × 10 6 km 3 , with a range of 4.30 × 10 6 –1.90 × 10 6 km 3 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. Text Hudson Strait Ice Sheet Copernicus Publications: E-Journals Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Climate of the Past 12 8 1601 1617 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
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 × 10 6 km 3 , with a range of 4.30 × 10 6 –1.90 × 10 6 km 3 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 |
Text |
author |
Roberts, William H. G. Payne, Antony J. Valdes, Paul J. |
spellingShingle |
Roberts, William H. G. Payne, Antony J. Valdes, Paul J. The role of basal hydrology in the surging of the Laurentide Ice Sheet |
author_facet |
Roberts, William H. G. Payne, Antony J. Valdes, Paul J. |
author_sort |
Roberts, William H. G. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-12-1601-2016 https://cp.copernicus.org/articles/12/1601/2016/ |
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_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-12-1601-2016 https://cp.copernicus.org/articles/12/1601/2016/ |
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 |
_version_ |
1766025919276777472 |