The cavity under the Amery Ice Shelf, East Antarctica
| Type | Article | ||||||||
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| Date | 2008-12 | ||||||||
| Language | English | ||||||||
| Author(s) | Galton-Fenzi B. K.1, 2, 3, Maraldi C.4, Coleman R.1, 2, 3, Hunter J.1, 3 | ||||||||
| Affiliation(s) | 1 : Univ Tasmania, Ctr Marine Sci, Hobart, Tas 7001, Australia. 2 : CSIRO, Hobart, Tas 7001, Australia. 3 : CRC, Hobart, Tas 7001, Australia. 4 : Legos, F-31401 Toulouse, France. |
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| Source | Journal Of Glaciology (0022-1430) (Int Glaciol Soc), 2008-12 , Vol. 54 , N. 188 , P. 881-887 | ||||||||
| DOI | 10.3189/002214308787779898 | ||||||||
| WOS© Times Cited | 31 | ||||||||
| Abstract | 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 similar to 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. | ||||||||
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