Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland
All around the margins of the Greenland Ice Sheet, marine-terminating glaciers have recently thinned and accelerated. The reduced basal friction has yielded increased flow velocity, while the rate of longitudinal stretching has been limited by ice viscosity, which itself critically depends on temper...
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Online Access: | http://hdl.handle.net/2115/78127 https://doi.org/10.3389/feart.2020.00065 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/78127 2023-05-15T16:20:51+02:00 Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland Seguinot, Julien Funk, Martin Bauder, Andreas Wyder, Thomas Senn, Cornelius Sugiyama, Shin http://hdl.handle.net/2115/78127 https://doi.org/10.3389/feart.2020.00065 eng eng Frontiers Media http://hdl.handle.net/2115/78127 Frontiers in earth science, 8: 65 http://dx.doi.org/10.3389/feart.2020.00065 https://creativecommons.org/licenses/by/4.0/ CC-BY Bowdoin crevasse borehole refreezing temperature Greenland glacier tidewater 450 article fthokunivhus https://doi.org/10.3389/feart.2020.00065 2022-11-18T01:05:57Z All around the margins of the Greenland Ice Sheet, marine-terminating glaciers have recently thinned and accelerated. The reduced basal friction has yielded increased flow velocity, while the rate of longitudinal stretching has been limited by ice viscosity, which itself critically depends on temperature. However, ice temperature has rarely been measured on such fast-flowing and heavily crevassed glaciers. Here, we present a 3-year record of englacial temperatures obtained 2 (in 2014) to 1 km (in 2017) from the calving front of Bowdoin Glacier (Kangerluarsuup Sermia), a tidewater glacier in northwestern Greenland. Two boreholes separated by 165 (2014) to 197 m (2017) show significant temperature differences averaging 2.07 degrees C on their entire depth. Englacial warming of up to 0.39 degrees C a(-1), an order of magnitude above the theoretical rate of heat diffusion and viscous dissipation, indicates a deep and local heat source within the tidewater glacier. We interpret the heat source as latent heat from meltwater refreezing in crevasses reaching to, or near to, the bed of the glacier, whose localization may be controlled by preferential meltwater infiltration in topographic dips between ogives. Article in Journal/Newspaper glacier Greenland Ice Sheet Tidewater Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Bowdoin ENVELOPE(-69.317,-69.317,77.683,77.683) Greenland Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Bowdoin crevasse borehole refreezing temperature Greenland glacier tidewater 450 |
spellingShingle |
Bowdoin crevasse borehole refreezing temperature Greenland glacier tidewater 450 Seguinot, Julien Funk, Martin Bauder, Andreas Wyder, Thomas Senn, Cornelius Sugiyama, Shin Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland |
topic_facet |
Bowdoin crevasse borehole refreezing temperature Greenland glacier tidewater 450 |
description |
All around the margins of the Greenland Ice Sheet, marine-terminating glaciers have recently thinned and accelerated. The reduced basal friction has yielded increased flow velocity, while the rate of longitudinal stretching has been limited by ice viscosity, which itself critically depends on temperature. However, ice temperature has rarely been measured on such fast-flowing and heavily crevassed glaciers. Here, we present a 3-year record of englacial temperatures obtained 2 (in 2014) to 1 km (in 2017) from the calving front of Bowdoin Glacier (Kangerluarsuup Sermia), a tidewater glacier in northwestern Greenland. Two boreholes separated by 165 (2014) to 197 m (2017) show significant temperature differences averaging 2.07 degrees C on their entire depth. Englacial warming of up to 0.39 degrees C a(-1), an order of magnitude above the theoretical rate of heat diffusion and viscous dissipation, indicates a deep and local heat source within the tidewater glacier. We interpret the heat source as latent heat from meltwater refreezing in crevasses reaching to, or near to, the bed of the glacier, whose localization may be controlled by preferential meltwater infiltration in topographic dips between ogives. |
format |
Article in Journal/Newspaper |
author |
Seguinot, Julien Funk, Martin Bauder, Andreas Wyder, Thomas Senn, Cornelius Sugiyama, Shin |
author_facet |
Seguinot, Julien Funk, Martin Bauder, Andreas Wyder, Thomas Senn, Cornelius Sugiyama, Shin |
author_sort |
Seguinot, Julien |
title |
Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland |
title_short |
Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland |
title_full |
Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland |
title_fullStr |
Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland |
title_full_unstemmed |
Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland |
title_sort |
englacial warming indicates deep crevassing in bowdoin glacier, greenland |
publisher |
Frontiers Media |
url |
http://hdl.handle.net/2115/78127 https://doi.org/10.3389/feart.2020.00065 |
long_lat |
ENVELOPE(-69.317,-69.317,77.683,77.683) |
geographic |
Bowdoin Greenland |
geographic_facet |
Bowdoin Greenland |
genre |
glacier Greenland Ice Sheet Tidewater |
genre_facet |
glacier Greenland Ice Sheet Tidewater |
op_relation |
http://hdl.handle.net/2115/78127 Frontiers in earth science, 8: 65 http://dx.doi.org/10.3389/feart.2020.00065 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2020.00065 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
_version_ |
1766008876596985856 |