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The cavity under the Amery Ice Shelf, East Antarctica

journal contribution
posted on 2023-05-16, 23:00 authored by Benjamin Galton-FenziBenjamin Galton-Fenzi, Maraldi, C, Richard ColemanRichard Coleman, John HunterJohn Hunter
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.

History

Publication title

Journal of Glaciology

Volume

54

Issue

188

Pagination

881-887

ISSN

0022-1430

Department/School

Institute for Marine and Antarctic Studies

Publisher

International Glaciological Society

Place of publication

United Kingdom

Rights statement

Copyright © 2008 IGS

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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