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Basal terraces on melting ice shelves

Dutrieux, Pierre; Stewart, Craig; Jenkins, Adrian; Nicholls, Keith W.; Corr, Hugh F J.; Rignot, Eric; Steffen, Konrad. 2014 Basal terraces on melting ice shelves. Geophysical Research Letters, 41 (15). 5506-5513. 10.1002/2014GL060618

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Abstract/Summary

Ocean waters melt the margins of Antarctic and Greenland glaciers, and individual glaciers' responses and the integrity of their ice shelves are expected to depend on the spatial distribution of melt. The bases of the ice shelves associated with Pine Island Glacier (West Antarctica) and Petermann Glacier (Greenland) have similar geometries, including kilometer-wide, hundreds-of-meter high channels oriented along and across the direction of ice flow. The channels are enhanced by, and constrain, oceanic melt. New meter-scale observations of basal topography reveal peculiar glaciated landscapes. Channel flanks are not smooth, but are instead stepped, with hundreds-of-meters-wide flat terraces separated by 5–50 m high walls. Melting is shown to be modulated by the geometry: constant across each terrace, changing from one terrace to the next, and greatly enhanced on the ~45° inclined walls. Melting is therefore fundamentally heterogeneous and likely associated with stratification in the ice-ocean boundary layer, challenging current models of ice shelf-ocean interactions.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/2014GL060618
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Polar Oceans
ISSN: 00948276
Additional Keywords: cryosphere, ice shelf-ocean interactions, ocean, ice
Date made live: 13 Oct 2014 08:38 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/508581

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