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Mapping the grounding zone of the Amery Ice Shelf,
Citation
Fricker, HA and Coleman, R and Padman, L and Scambos, TA and Bohlander, J and Brunt, KM, Mapping the grounding zone of the Amery Ice Shelf,, Antarctic Science, 21, (5) pp. 515-532. ISSN 0954-1020 (2009) [Refereed Article]
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Copyright Statement
Antarctic Science, Cambridge University Press Copyright © Antarctic Science Ltd 2009
DOI: doi:10.1017/S095410200999023X
Abstract
We use a combination of satellite techniques (interferometric synthetic aperture radar (InSAR),
visible-band imagery, and repeat-track laser altimetry) to develop a benchmark map for the Amery
Ice Shelf (AIS) grounding zone (GZ), including its islands and ice rises. The break-in-slope, as an indirect
estimate of grounding line location, was mapped for the entire AIS. We have also mapped ,55% of the
landward edge and ,30% of the seaward edge of the ice shelf flexure boundary for the AIS perimeter.
Vertical ice motion from Global Positioning System receivers confirms the location of the satellite-derived
GZ in two regions. Our map redefines the extent of floating ice in the south-western AIS and identifies
several previously unmapped grounded regions, improving our understanding of the stresses supporting the
current dynamical state of the ice shelf. Finally, we identify three along-flow channels in the ice shelf basal
topography, approximately 10 km apart, 1.5 km wide and 300–500m deep, near the southern GZ. These
channels, which form at the suture zones between ice streams, may represent zones of potential weakness in
the ice shelf and may influence sub-ice-shelf ocean circulation.
Item Details
Item Type: | Refereed Article |
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Keywords: | grounding lines, ice shelves, remote sensing, tides |
Research Division: | Earth Sciences |
Research Group: | Physical geography and environmental geoscience |
Research Field: | Glaciology |
Objective Division: | Environmental Management |
Objective Group: | Coastal and estuarine systems and management |
Objective Field: | Assessment and management of coastal and estuarine ecosystems |
UTAS Author: | Coleman, R (Professor Richard Coleman) |
ID Code: | 62105 |
Year Published: | 2009 |
Web of Science® Times Cited: | 83 |
Deposited By: | Centre for Marine Science |
Deposited On: | 2010-03-10 |
Last Modified: | 2010-05-12 |
Downloads: | 4 View Download Statistics |
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