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Glacier dynamics near the calving front of Bowdoin Glacier, northwestern Greenland

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Title: Glacier dynamics near the calving front of Bowdoin Glacier, northwestern Greenland
Authors: Sugiyama, Shin Browse this author →KAKEN DB
Sakakibara, Daiki Browse this author
Tsutaki, Shun Browse this author
Maruyama, Mihiro Browse this author
Sawagaki, Takanobu Browse this author →KAKEN DB
Keywords: Arctic glaciology
glacier calving
glacier flow
ice/ocean interactions
subglacial processes
Issue Date: 30-May-2015
Publisher: International Glaciological Society (IGS)
Journal Title: Journal of glaciology
Volume: 61
Issue: 226
Start Page: 223
End Page: 232
Publisher DOI: 10.3189/2015JoG14J127
Abstract: To better understand recent rapid recession of marine-terminating glaciers in Greenland, we performed satellite and field observations near the calving front of Bowdoin Glacier, a 3 km wide outlet glacier in northwestern Greenland. Satellite data revealed a clear transition to a rapidly retreating phase in 2008 from a relatively stable glacier condition that lasted for >20 years. Ice radar measurements showed that the glacier front is grounded, but very close to the floating condition. These results, in combination with the results of ocean depth soundings, suggest bed geometry in front of the glacier is the primary control on the rate and pattern of recent rapid retreat. Presumably, glacier thinning due to atmospheric and/or ocean warming triggered the initial retreat. In situ measurements showed complex short-term ice speed variations, which were correlated with air temperature, precipitation and ocean tides. Ice speed quickly responded to temperature rise and a heavy rain event, indicating rapid drainage of surface water to the bed. Semi-diurnal speed peaks coincided with low tides, suggesting the major role of the hydrostatic pressure acting on the calving face in the force balance. These observations demonstrate that the dynamics of Bowdoin Glacier are sensitive to small perturbations occurring near the calving front.
Rights: © 2015 International Glaciological Society
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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