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Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland

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Title: Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland
Authors: Seguinot, Julien Browse this author
Funk, Martin Browse this author
Bauder, Andreas Browse this author
Wyder, Thomas Browse this author
Senn, Cornelius Browse this author
Sugiyama, Shin Browse this author →KAKEN DB
Keywords: Bowdoin
Issue Date: 17-Mar-2020
Publisher: Frontiers Media
Journal Title: Frontiers in earth science
Volume: 8
Start Page: 65
Publisher DOI: 10.3389/feart.2020.00065
Abstract: 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.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉山 慎

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