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The cavity under the Amery Ice Shelf, East Antarctica

journal contribution
posted on 2023-05-26, 15:54 authored by Galton-Fenzi, BK, Maraldi, C, Richard ColemanRichard Coleman, John HunterJohn Hunter
Ocean circulation under ice shelves and associated rates of melting 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 ‚Äöv†¬¿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

Article number

188

Number

188

Pagination

881-887

ISSN

0022-1430

Publication status

  • Published

Rights statement

Copyright IGS 2008

Repository Status

  • Restricted

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