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The cavity under the Amery Ice Shelf, East Antarctica

Citation

Galton-Fenzi, B and Maraldi, C and Coleman, R and Hunter, JR, The cavity under the Amery Ice Shelf, East Antarctica, Journal of Glaciology, 54, (188) pp. 881-887. ISSN 0022-1430 (2008) [Refereed Article]


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Copyright Statement

Copyright © 2008 IGS

Official URL: http://www.igsoc.org

DOI: doi:10.3189/002214308787779898

Abstract

Ocean circulation under ice shelves and associated rates ofmelting and freezing are strongly influenced by the shape of the sub-ice-shelf cavity. We have refined an existing method and used additional in situ measurements to estimate the cavity shape under the Amery Ice Shelf, East Antarctica. A finite-element hydrodynamic ocean-tide model was used to simulate the major tidal constituents for a range of different sub-Amery Ice Shelf cavity water-column thicknesses. The data are adjusted in the largely unsurveyed southern region of the ice-shelf cavity by comparing the complex error between simulated tides and in situ tides, derived from GPS observations. We show a significant improvement in the simulated tides, with a combined complex error of 1.8 cm, in comparison with past studies which show a complex error of ¡­5.3 cm. Our bathymetry incorporates ice-draft data at the grounding line and seismic surveys, which have provided a considerable amount of new data. This technique has particular application when the water column beneath ice shelves is inaccessible and in situ GPS data are available.

Item Details

Item Type:Refereed Article
Keywords:Amery Ice Shelf, East Antarctica, physical oceanography,sub-ice-shelf cavity, ocean circulation
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Galton-Fenzi, B (Dr Ben Galton-Fenzi)
Author:Coleman, R (Professor Richard Coleman)
Author:Hunter, JR (Dr John Hunter)
ID Code:55036
Year Published:2008
Web of Science® Times Cited:21
Deposited By:Centre for Marine Science
Deposited On:2009-03-04
Last Modified:2009-07-28
Downloads:4 View Download Statistics

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