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Bathymetry and Ice draft maps for the Amery Ice Shelf cavity Entry ID: AIS_GEOM |
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Summary
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Abstract:
Ocean circulation beneath ice shelves and associated rates of melting and freezing are influenced strongly by water column thickness and depth. The shape of the cavity beneath the Amery Ice Shelf is important for our understanding of ice shelf stability and freshwater input to the ocean and their dependence on climate. New seismic surveys of the centre region of the Amery Ice Shelf and ice-draft data taken at the grounding line has provided a considerable amount of new water-column thickness and bathymetry data. The data is adjusted in the unknown region south of 71 degrees 35 minutes S by comparing the complex error between simulated tides against in situ GPS observations. A finite element, hydrodynamic ocean tide model is used to simulate the 4 major constituents (S2, M2, K1 and O1). The new data differs from a previous bathymetry map in a number of places. Significantly, there is channel that leads from the Prydz bay depression into the deepest part of the AIS cavity in the south through a series of depressions. This technique has particular application when the water column beneath ice shelves is inaccessible and in situ GPS data is available.
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Related URL
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Link:
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Description: Download point for the data - text files Link: VIEW RELATED INFORMATION Description: Citation reference for this metadata record and dataset |
Geographic Coverage
| N: -66.0 | S: -73.6 | E: 79.0 | W: 66.0 |
| Min Depth: 0 M | Max Depth: 3500 M |
Temporal Coverage
| Start Date: 1950-01-01 |
| Stop Date: 2006-04-01 |
Location Keywords
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OCEAN
> SOUTHERN OCEAN
CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
Data Resolution
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Vertical Resolution:
50 m
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Science Keywords
| CRYOSPHERE >SNOW/ICE >ICE DEPTH/THICKNESS [Definition] |
| OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >BATHYMETRY [Definition] |
| CRYOSPHERE >FROZEN GROUND >GROUND ICE [Definition] |
ISO Topic Category
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OCEANS
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Platform
| AIRCRAFT [Information] |
| SHIPS [Information] |
Instrument
| TIDE GAUGES [Information] |
| GPS >Global Positioning System [Information] |
| AIRSAR >Airborne Synthetic Aperture Radar [Information] |
| SEISMIC REFLECTION PROFILERS [Information] |
| SEISMOGRAPHS [Information] |
| SEISMOMETERS [Information] |
| IFSAR >Interferometric Synthetic Aperture Radar |
Quality
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The data were gridded onto a WGS84 projection with a 2x2 km resolution. Horizontal datum: WGS84 Vertical datum: Mean sea level |
Access Constraints
| These data are publicly available for download from the provided URL. |
Use Constraints
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This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/3.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AIS_GEOM when using these data. |
Keywords
| Amery Ice Shelf |
| Ice Draft |
| Grounding line |
Data Set Progress
| COMPLETE |
Originating Center
| ACE CRC |
Data Center
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Australian Antarctic Data Centre, Australia
[Information]
Data Center URL: http://data.aad.gov.au
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Distribution
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Distribution_Media:
HTTP
Distribution_Size: 4.7 MB Distribution_Format: text, pdf Fees: free |
Personnel
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BEN
K
GALTON-FENZI Role: INVESTIGATOR Role: TECHNICAL CONTACT Role: DIF AUTHOR Phone: +61 3 6226 2251 Fax: +61 3 6226 2973 Email: bkgalton at utas.edu.au Contact Address: ACE CRC Private bag 80 City: Hobart Province or State: Tasmania Postal Code: 7001 Country: Australia |
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RICHARD
COLEMAN Role: TECHNICAL CONTACT Phone: +61 3 6226 2108 Fax: +61 3 6224 0282 Email: Richard.Coleman at utas.edu.au Contact Address: Centre for Spatial Information Science School of Geography and Environmental Studies University of Tasmania Private Bag 76 City: Hobart Province or State: Tasmania Postal Code: 7001 Country: Australia |
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CLAIRE
MARALDI Role: TECHNICAL CONTACT Email: maraldi at notos.cst.cnes.fr |
Publications/References
Galton-Fenzi, B. K., C. Maraldi, R. Coleman and J. Hunter (2007), The Geometry of the cavity beneath the Amery Ice Shelf, East Antarctica, Geophys. Res. Lett.
Maraldi, C., B. Galton-Fenzi, F. Lyard, and L. Testut (2007), Barotropic Tides of the Southern Indian Ocean and the Amery Ice Shelf Cavity, Geophys. Res. Lett., doi:10.1029/2007GL030900, in press
Maraldi, C., B. Galton-Fenzi, F. Lyard, and L. Testut (2007), Barotropic Tides of the Southern Indian Ocean and the Amery Ice Shelf Cavity, Geophys. Res. Lett., doi:10.1029/2007GL030900, in press
Creation and Review Dates
DIF Creation Date:
2007-08-23
Last DIF Revision Date:
2012-05-04
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