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Response of the flow dynamics of Bowdoin Glacier, northwestern Greenland, to basal lubrication and tidal forcing

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Title: Response of the flow dynamics of Bowdoin Glacier, northwestern Greenland, to basal lubrication and tidal forcing
Authors: SEDDIK, HAKIME Browse this author
GREVE, RALF Browse this author →KAKEN DB
SAKAKIBARA, DAIKI Browse this author
TSUTAKI, SHUN Browse this author
MINOWA, MASAHIRO Browse this author
SUGIYAMA, SHIN Browse this author →KAKEN DB
Keywords: Arctic glaciology
glacier flow
glacier fluctuations
glacier modelling
ice/ocean interactions
Issue Date: Apr-2019
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 65
Issue: 250
Start Page: 225
End Page: 238
Publisher DOI: 10.1017/jog.2018.106
Abstract: We use the full-Stokes model Elmer/Ice to investigate the present dynamics of Bowdoin Glacier, a marine-terminating outlet glacier in northwestern Greenland. Short-term speed variations of the glacier were observed, correlating with air temperature and precipitation, and with the semi-diurnal ocean tides. We use a control inverse method to determine the distribution of basal friction. This reveals that most of the glacier area is characterized by near-plug-flow conditions, while some sticky spots are also identified. We then conduct experiments to test the sensitivity of the glacier flow to basal lubrication and tidal forcing at the calving front. Reduction of the basal drag by 10–40% produces speed-ups that agree approximately with the observed range of speed-ups that result from warm weather and precipitation events. In agreement with the observations, tidal forcing and surface speed near the calving front are found to be in anti-phase (high tide corresponds to low speed, and vice versa). However, the amplitude of the semi-diurnal variability is underpredicted by a factor ~ 3, which is likely related to either inaccuracies in the surface and bedrock topographies or mechanical weakening due to crevassing.
Type: article
URI: http://hdl.handle.net/2115/74499
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: Greve Ralf

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