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An investigation into the forces that drive ice-shelf rift propagation on the Amery Ice Shelf, East Antarctica

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Bassis, JN and Fricker, HA and Coleman, R and Minster, JB (2008) An investigation into the forces that drive ice-shelf rift propagation on the Amery Ice Shelf, East Antarctica. Journal of Glaciology, 54 (184). pp. 17-27. ISSN 0022-1430

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Abstract

For three field seasons (2002/03, 2004/05, 2005/06) we have deployed a network of GPS receivers and seismometers around the tip of a propagating rift on the Amery Ice Shelf, East Antarctica. During these campaigns we detected seven bursts of episodic rift propagation. To determine whether these rift propagation events were triggered by short-term environmental forcings, we analyzed simultaneous ancillary data such as wind speeds, tidal amplitudes and sea-ice fraction (a proxy variable for ocean swell). We find that none of these environmental forcings, separately or together, correlated with rift propagation. This apparent insensitivity of ice-shelf rift propagation to short-term environmental forcings leads us to suggest that the rifting process is primarily driven by the internal glaciological stress. Our hypothesis is supported by order-of-magnitude calculations that the glaciological stress is the dominant term in the force balance. However, our calculations also indicate that as the ice shelf thins or the rift system matures and iceberg detachment becomes imminent, short-term stresses due to winds and ocean swell may become more important.

Item Type: Article
Journal or Publication Title: Journal of Glaciology
Page Range: pp. 17-27
ISSN: 0022-1430
Identification Number - DOI: 10.3189/002214308784409116
Additional Information: Copyright 2008, International Glaciological Society.
Date Deposited: 18 Aug 2008 00:15
Last Modified: 18 Nov 2014 03:45
URI: http://eprints.utas.edu.au/id/eprint/7000
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