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Diurnal and semidiurnal tide-induced lateral movement of Ronne Ice Shelf, Antarctica
journal contribution
posted on 2023-05-17, 23:06 authored by Makinson, K, Matt KingMatt King, Nicholls, KW, Gudmundsson, GHRecent 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.
History
Publication title
Geophysical Research LettersVolume
39Issue
10Article number
L10501Number
L10501Pagination
1-5ISSN
1944-8007Department/School
School of Geography, Planning and Spatial SciencesPublisher
Wiley-Blackwell PublishingPlace of publication
United States of AmericaRights statement
Copyright 2012 American Geophysical UnionRepository Status
- Restricted