A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment
We present the results of a new numerical model of the late glacial western Laurentide Ice Sheet, constrained by observations of glacial isostatic adjustment (GIA), including relative sea level indicators, uplift rates from permanent GPS stations, contemporary differential lake level change, and pos...
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Online Access: | https://doi.org/10.1016/j.quascirev.2016.03.003 http://infoscience.epfl.ch/record/219779 |
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ftinfoscience:oai:infoscience.tind.io:219779 2023-05-15T16:23:06+02:00 A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment Gowan, Evan J. Tregoning, Paul Purcell, Anthony Montillet, Jean-Philippe Mcclusky, Simon 2016-07-19T10:08:55Z https://doi.org/10.1016/j.quascirev.2016.03.003 http://infoscience.epfl.ch/record/219779 unknown Oxford, Elsevier doi:10.1016/j.quascirev.2016.03.003 ISI:000374606100001 http://infoscience.epfl.ch/record/219779 http://infoscience.epfl.ch/record/219779 Text 2016 ftinfoscience https://doi.org/10.1016/j.quascirev.2016.03.003 2023-02-13T22:34:44Z We present the results of a new numerical model of the late glacial western Laurentide Ice Sheet, constrained by observations of glacial isostatic adjustment (GIA), including relative sea level indicators, uplift rates from permanent GPS stations, contemporary differential lake level change, and postglacial tilt of glacial lake level indicators. The later two datasets have been underutilized in previous GIA based ice sheet reconstructions. The ice sheet model, called NAICE, is constructed using simple ice physics on the basis of changing margin location and basal shear stress conditions in order to produce ice volumes required to match GIA. The model matches the majority of the observations, while maintaining a relatively realistic ice sheet geometry. Our model has a peak volume at 18,000 yr BP, with a dome located just east of Great Slave Lake with peak thickness of 4000 m, and surface elevation of 3500 m. The modelled ice volume loss between 16,000 and 14,000 yr BP amounts to about 7.5 m of sea level equivalent, which is consistent with the hypothesis that a large portion of Meltwater Pulse 1A was sourced from this part of the ice sheet. The southern part of the ice sheet was thin and had a low elevation profile. This model provides an accurate representation of ice thickness and paleo-topography, and can be used to assess present day uplift and infer past climate. (C) 2016 Elsevier Ltd. All rights reserved. Text Great Slave Lake Ice Sheet EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Quaternary Science Reviews 139 1 16 |
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Open Polar |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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ftinfoscience |
language |
unknown |
description |
We present the results of a new numerical model of the late glacial western Laurentide Ice Sheet, constrained by observations of glacial isostatic adjustment (GIA), including relative sea level indicators, uplift rates from permanent GPS stations, contemporary differential lake level change, and postglacial tilt of glacial lake level indicators. The later two datasets have been underutilized in previous GIA based ice sheet reconstructions. The ice sheet model, called NAICE, is constructed using simple ice physics on the basis of changing margin location and basal shear stress conditions in order to produce ice volumes required to match GIA. The model matches the majority of the observations, while maintaining a relatively realistic ice sheet geometry. Our model has a peak volume at 18,000 yr BP, with a dome located just east of Great Slave Lake with peak thickness of 4000 m, and surface elevation of 3500 m. The modelled ice volume loss between 16,000 and 14,000 yr BP amounts to about 7.5 m of sea level equivalent, which is consistent with the hypothesis that a large portion of Meltwater Pulse 1A was sourced from this part of the ice sheet. The southern part of the ice sheet was thin and had a low elevation profile. This model provides an accurate representation of ice thickness and paleo-topography, and can be used to assess present day uplift and infer past climate. (C) 2016 Elsevier Ltd. All rights reserved. |
format |
Text |
author |
Gowan, Evan J. Tregoning, Paul Purcell, Anthony Montillet, Jean-Philippe Mcclusky, Simon |
spellingShingle |
Gowan, Evan J. Tregoning, Paul Purcell, Anthony Montillet, Jean-Philippe Mcclusky, Simon A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment |
author_facet |
Gowan, Evan J. Tregoning, Paul Purcell, Anthony Montillet, Jean-Philippe Mcclusky, Simon |
author_sort |
Gowan, Evan J. |
title |
A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment |
title_short |
A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment |
title_full |
A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment |
title_fullStr |
A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment |
title_full_unstemmed |
A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment |
title_sort |
model of the western laurentide ice sheet, using observations of glacial isostatic adjustment |
publisher |
Oxford, Elsevier |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.quascirev.2016.03.003 http://infoscience.epfl.ch/record/219779 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-114.001,-114.001,61.500,61.500) |
geographic |
Glacial Lake Great Slave Lake |
geographic_facet |
Glacial Lake Great Slave Lake |
genre |
Great Slave Lake Ice Sheet |
genre_facet |
Great Slave Lake Ice Sheet |
op_source |
http://infoscience.epfl.ch/record/219779 |
op_relation |
doi:10.1016/j.quascirev.2016.03.003 ISI:000374606100001 http://infoscience.epfl.ch/record/219779 |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.03.003 |
container_title |
Quaternary Science Reviews |
container_volume |
139 |
container_start_page |
1 |
op_container_end_page |
16 |
_version_ |
1766011285946761216 |