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Winter speed-up of quiescent surge-type glaciers in Yukon, Canada

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Title: Winter speed-up of quiescent surge-type glaciers in Yukon, Canada
Authors: Abe, T. Browse this author
Furuya, M. Browse this author
Issue Date: 5-Jun-2015
Journal Title: The Cryosphere
Volume: 9
Issue: 3
Start Page: 1183
End Page: 1190
Publisher DOI: 10.5194/tc-9-1183-2015
Abstract: Glacier surges often initiate in winter, but the mechanism remains unclear in contrast to the well-known summer speed-up at normal glaciers. To better understand the mechanism, we used radar images to examine spatial-temporal changes in the ice velocity of surge-type glaciers near the border of Alaska and the Yukon, focusing on their quiescent phase. We found significant accelerations in the upstream region from autumn to winter, regardless of surging episodes. Moreover, the winter speed-up propagated from upstream to downstream. Given the absence of surface meltwater input in winter, we suggest the presence of water storage near the base that does not directly connect to the surface, yet can promote basal sliding through increased water pressure. Our findings have implications for the modelling of glacial hydrology in winter, which may help us better understand glacier dynamics.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 阿部 隆博

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