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Ice Shelf Water plume flow beneath Filchner-Ronne Ice Shelf, Antarctica

Holland, Paul R.; Feltham, Daniel L.; Jenkins, Adrian. 2007 Ice Shelf Water plume flow beneath Filchner-Ronne Ice Shelf, Antarctica. Journal of Geophysical Research, 112 (C5), C05044. 12, pp. 10.1029/2006JC003915

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Abstract/Summary

A two-dimensional plume model is used to study the interaction between Filchner-Ronne Ice Shelf, Antarctica and its underlying ocean cavity. Ice Shelf Water (ISW) plumes are initiated by the freshwater released from a melting ice shelf and, if they rise, may become supercooled and deposit marine ice due to the pressure increase in the in situ freezing temperature. The aim of this modeling study is to determine the origin of the thick accretions of marine ice at the base of Filchner-Ronne Ice Shelf and thus improve our understanding of ISW flow paths. The model domain is defined from measurements of ice shelf draft, and from this ISW the model is able to predict plumes that exit the cavity in the correct locations. The modeled plumes also produce basal freezing rates that account for measured marine ice thicknesses in the western part of Ronne Ice Shelf. We find that the freezing rate and plume properties are significantly influenced by the confluence of plumes from different meltwater sources. We are less successful in matching observations of marine ice under the rest of Filchner-Ronne Ice Shelf, which we attribute primarily to this model’s neglect of circulations in the ocean outside the plume.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2006JC003915
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Antarctic Climate and the Earth System
ISSN: 0148-0227
Additional Keywords: Filchner-Ronne ice shelf; frazil ice; Ice Shelf Water; plume model; marine ice
NORA Subject Terms: Marine Sciences
Glaciology
Date made live: 27 May 2008 13:49
URI: http://nora.nerc.ac.uk/id/eprint/3119

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