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Rapid erosion, drumlin formation, and changing hydrology beneath an Antarctic ice stream

Smith, A.M.; Murray, T.; Nicholls, K.W.; Makinson, K.; Adalgeirsdottir, G.; Behar, A.; Vaughan, D.G.. 2007 Rapid erosion, drumlin formation, and changing hydrology beneath an Antarctic ice stream. Geology, 35 (2). 127-130. 10.1130/G23036A.1

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Abstract/Summary

What happens beneath a glacier affects the way it flows and the landforms left behind when it retreats. Direct observations from beneath glaciers are, however, rare and the subglacial environment remains poorly understood. We present new, repeat observations from West Antarctica that show active processes beneath a modern glacier which can normally only be postulated from the geological record. We interpret erosion at a rate of 1 m a−1 beneath a fast-flowing ice stream, followed by cessation of erosion and the formation of a drumlin from mobilized sediment. We also interpret both mobilization and increased compaction of basal sediment with associated hydrological changes within the glacier bed. All these changes occurred on time scales of a few years or less. This variability suggests that an ice stream can reorganize its bed rapidly, and that present models of ice dynamics may not simulate all the relevant subglacial processes.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1130/G23036A.1
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Glacial Retreat in Antarctica and Deglaciation of the Earth System
ISSN: 0091-7613
Additional Keywords: subglacial environment, ice streams, drumlins, erosion
NORA Subject Terms: Glaciology
Earth Sciences
Date made live: 13 Nov 2007 15:01
URI: http://nora.nerc.ac.uk/id/eprint/1197

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