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Tide-induced lateral movement of Brunt Ice Shelf, Antarctica


Doake, CSM and Corr, HFJ and Nicholls, KW and Gaffikin, A and Jenkins, A and Bertiger, WI and King, MA, Tide-induced lateral movement of Brunt Ice Shelf, Antarctica, Geophysical Research Letters, 29, (8) pp. 67-1 - 67-4. ISSN 0094-8276 (2002) [Refereed Article]


Accurate position data show that Brunt Ice Shelf has an irregular three-dimensional motion driven by the ocean tide. A 30-day GPS record from Halley station shows not only the expected vertical tidal displacement, but also a significant variation in horizontal velocity. The maximum forward velocity occurs about four hours before the maximum tidal height, a phase relationship that suggests ocean currents may be responsible. However, values of ice/water friction coefficients needed to make this explanation plausible appear to be too high to be physically reasonable. Alternative explanations invoke interactions between the ice shelf and a grounded area at the ice front. Our findings suggest that significant errors might result if these motions are ignored when interpreting 'double difference' satellite SAR interferograms, where the common assumption is that the horizontal velocity of an ice shelf has no tidal dependence.

Item Details

Item Type:Refereed Article
Keywords:Global positioning system; Interferometry; Tides; Tidal displacements; Ice; GPS; ice shelf; movement; ocean tide; Antarctica; Weddell Sea
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Physical geography and environmental geoscience not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:King, MA (Professor Matt King)
ID Code:81795
Year Published:2002
Deposited By:Geography and Environmental Studies
Deposited On:2013-01-08
Last Modified:2013-01-08

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