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| Titel |
Winter speed-up of quiescent surge-type glaciers in Yukon, Canada |
| VerfasserIn |
T. Abe, M. Furuya |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 3 ; Nr. 9, no. 3 (2015-06-05), S.1183-1190 |
| Datensatznummer |
250116808
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| Publikation (Nr.) |
 copernicus.org/tc-9-1183-2015.pdf |
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| Zusammenfassung |
| 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. |
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