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Seasonal ice-speed variations in 10 marine-terminating outlet glaciers along the coast of Prudhoe Land, northwestern Greenland

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Title: Seasonal ice-speed variations in 10 marine-terminating outlet glaciers along the coast of Prudhoe Land, northwestern Greenland
Authors: Sakakibara, Daiki Browse this author
Sugiyama, Shin Browse this author →KAKEN DB
Keywords: Arctic glaciology
glacier monitoring
ice velocity
remote sensing
Issue Date: Feb-2020
Publisher: Cambridge University Press
Journal Title: Journal of glaciology
Volume: 66
Issue: 255
Start Page: 25
End Page: 34
Publisher DOI: 10.1017/jog.2019.81
Abstract: We present a 3-year record of seasonal variations in ice speed and frontal ablation of 10 marine-terminating outlet glaciers along the coast of Prudhoe Land in northwestern Greenland. The glaciers showed seasonal speedup initiated between late May and early June, and terminated between late June and early July. Ice speed subsequently decreased from July to September. The timing of the speedup coincided with the onset of the air temperature rise to above freezing, suggesting an influence of meltwater availability on the glacier dynamics. No clear relationship was found between the speedup and the terminus position or the sea-ice/ice-melange conditions. These results suggest that the meltwater input to the glacier bed triggered the summer speedup. The excess of summer speed (June-August) over the mean for the rest of the year accounted for 0.5-13% of the annual ice motion. Several glaciers showed seasonal frontal variations, i.e. retreat in summer and advance in winter. This was not due to ice-speed variations, but was driven by seasonal variations in frontal ablation. The results demonstrate the dominant effect of glacier surface melting on the seasonal speedup, and the importance of seasonal speed patterns on longer-term ice motion of marine-terminating outlet glaciers in Greenland.
Rights: https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/76923
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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