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Diurnal and semidiurnal tide-induced lateral movement of Ronne Ice Shelf, Antarctica

Citation

Makinson, K and King, MA and Nicholls, KW and Gudmundsson, GH, Diurnal and semidiurnal tide-induced lateral movement of Ronne Ice Shelf, Antarctica, Geophysical Research Letters, 39, (10) Article L10501. ISSN 1944-8007 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 American Geophysical Union

DOI: doi:10.1029/2012GL051636

Abstract

Recent GPS observations from a spatially extensive network across Ronne Ice Shelf show significant daily ice flow variations. At all sites, the almost-synchronous horizontal displacements occur at diurnal and semidiurnal tidal periods. During spring tides, displacements, velocities and strains near the ice front have superimposed oscillations that are 300% of their mean values and occur over a six-hour period, resulting in regular ice shelf flow reversals. Close to ice stream grounding lines, however, the horizontal diurnal and semidiurnal signals decay and almost vanish. From our analysis, we conclude that ice shelves respond primarily elastically to tidal tilting, thus accounting for the observed diurnal and semidiurnal flow variations, and their amplification toward the ice shelf front. Our findings suggest that detailed modeling of these data could provide improved ice shelf and ice stream models for correctly simulating ice shelf flow and predicting future ice sheet evolution.

Item Details

Item Type:Refereed Article
Keywords:Antarctica, ice sheets, tides
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Geodesy
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate and Climate Change not elsewhere classified
Author:King, MA (Professor Matt King)
ID Code:89656
Year Published:2012
Web of Science® Times Cited:15
Deposited By:Geography and Environmental Studies
Deposited On:2014-03-11
Last Modified:2014-05-07
Downloads:0

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