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Surface elevation changes during 2007-13 on Bowdoin and Tugto Glaciers, northwestern Greenland

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Title: Surface elevation changes during 2007-13 on Bowdoin and Tugto Glaciers, northwestern Greenland
Authors: Tsutaki, Shun Browse this author
Sugiyama, Shin Browse this author →KAKEN DB
Sakakibara, Daiki Browse this author
Sawagaki, Takanobu Browse this author →KAKEN DB
Keywords: Arctic glaciology
glacier flow
glacier thinning
Issue Date: 9-Sep-2016
Publisher: Cambridge University Press
Journal Title: Journal of glaciology
Volume: 62
Issue: 236
Start Page: 1083
End Page: 1092
Publisher DOI: 10.1017/jog.2016.106
Abstract: To quantify recent thinning of marine-terminating outlet glaciers in northwestern Greenland, we carried out field and satellite observations near the terminus of Bowdoin Glacier. These data were used to compute the change in surface elevation from 2007 to 2013 and this rate of thinning was then compared with that of the adjacent land-terminating Tugto Glacier. Comparing DEMs of 2007 and 2010 shows that Bowdoin Glacier is thinning more rapidly (4.1 +/- 0.3 m a(-1)) than Tugto Glacier (2.8 +/- 0.3 m a(-1)). The observed negative surface mass-balance accounts for <40% of the elevation change of Bowdoin Glacier, meaning that the thinning of Bowdoin Glacier cannot be attributable to surface melting alone. The ice speed of Bowdoin Glacier increases down-glacier, reaching 457 m a(-1) near the calving front. This flow regime causes longitudinal stretching and vertical compression at a rate of -0.04 a(-1). It is likely that this dynamically-controlled thinning has been enhanced by the acceleration of the glacier since 2000. Our measurements indicate that ice dynamics indeed play a predominant role in the rapid thinning of Bowdoin Glacier.
Rights: ©Tsutaki 2016. © International Glaciological Society 2016
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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