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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ftdoajarticles:oai:doaj.org/article:f2d12e674f2b42c28cacf65d049185d0 2023-05-15T16:20:53+02:00 Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland Julien Seguinot Martin Funk Andreas Bauder Thomas Wyder Cornelius Senn Shin Sugiyama 2020-03-01T00:00:00Z https://doi.org/10.3389/feart.2020.00065 https://doaj.org/article/f2d12e674f2b42c28cacf65d049185d0 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/feart.2020.00065/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2020.00065 https://doaj.org/article/f2d12e674f2b42c28cacf65d049185d0 Frontiers in Earth Science, Vol 8 (2020) Bowdoin crevasse borehole refreezing temperature Greenland Science Q article 2020 ftdoajarticles https://doi.org/10.3389/feart.2020.00065 2022-12-31T12:50:22Z 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°C on their entire depth. Englacial warming of up to 0.39°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 Directory of Open Access Journals: DOAJ Articles Bowdoin ENVELOPE(-69.317,-69.317,77.683,77.683) Greenland Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Bowdoin crevasse borehole refreezing temperature Greenland Science Q |
spellingShingle |
Bowdoin crevasse borehole refreezing temperature Greenland Science Q Julien Seguinot Martin Funk Andreas Bauder Thomas Wyder Cornelius Senn Shin Sugiyama Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland |
topic_facet |
Bowdoin crevasse borehole refreezing temperature Greenland Science Q |
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°C on their entire depth. Englacial warming of up to 0.39°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 |
Julien Seguinot Martin Funk Andreas Bauder Thomas Wyder Cornelius Senn Shin Sugiyama |
author_facet |
Julien Seguinot Martin Funk Andreas Bauder Thomas Wyder Cornelius Senn Shin Sugiyama |
author_sort |
Julien Seguinot |
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 S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/feart.2020.00065 https://doaj.org/article/f2d12e674f2b42c28cacf65d049185d0 |
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_source |
Frontiers in Earth Science, Vol 8 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/feart.2020.00065/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2020.00065 https://doaj.org/article/f2d12e674f2b42c28cacf65d049185d0 |
op_doi |
https://doi.org/10.3389/feart.2020.00065 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
_version_ |
1766008902446481408 |