Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system
We report on three GPS records of flow of the Larsen C Ice Shelf, spanning 2 months to 2 years. Variations in speed are evident at periods from a few hours to 182 days, including semi-diurnal, diurnal and 14.76 days. At fortnightly periods the ice shelf varies by 10% from its long-term speed but at...
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Online Access: | https://doi.org/10.1029/2011GL046680 http://ecite.utas.edu.au/82167 |
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ftunivtasecite:oai:ecite.utas.edu.au:82167 2023-05-15T16:41:46+02:00 Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system King, MA Makinson, K Gudmundsson, GH 2011 https://doi.org/10.1029/2011GL046680 http://ecite.utas.edu.au/82167 en eng Wiley-Blackwell Publishing, Inc. http://dx.doi.org/10.1029/2011GL046680 King, MA and Makinson, K and Gudmundsson, GH, Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system, Geophysical Research Letters, 38, (8) Article L08501. ISSN 0094-8276 (2011) [Refereed Article] http://ecite.utas.edu.au/82167 Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.1029/2011GL046680 2019-12-13T21:47:09Z We report on three GPS records of flow of the Larsen C Ice Shelf, spanning 2 months to 2 years. Variations in speed are evident at periods from a few hours to 182 days, including semi-diurnal, diurnal and 14.76 days. At fortnightly periods the ice shelf varies by 10% from its long-term speed but at diurnal timescales it is up to 100%. A nonlinear relationship between ocean tides and velocity is required to explain the observed variations in flow. As an initial examination we model flow as a non-linear function of basal shear stress including tidal perturbations in the ice shelf grounding zone and show that the major features of the observations are reproduced, notably the long-period signal largely absent from the vertical tidal signal. Alternative explanations are discussed. These observations demonstrate that the ice shelf system is highly sensitive to relatively modest changes in forcing at its boundaries. Copyright 2011 by the American Geophysical Union. Article in Journal/Newspaper Ice Shelf eCite UTAS (University of Tasmania) Geophysical Research Letters 38 8 n/a n/a |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified |
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Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified King, MA Makinson, K Gudmundsson, GH Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Physical Geography and Environmental Geoscience not elsewhere classified |
description |
We report on three GPS records of flow of the Larsen C Ice Shelf, spanning 2 months to 2 years. Variations in speed are evident at periods from a few hours to 182 days, including semi-diurnal, diurnal and 14.76 days. At fortnightly periods the ice shelf varies by 10% from its long-term speed but at diurnal timescales it is up to 100%. A nonlinear relationship between ocean tides and velocity is required to explain the observed variations in flow. As an initial examination we model flow as a non-linear function of basal shear stress including tidal perturbations in the ice shelf grounding zone and show that the major features of the observations are reproduced, notably the long-period signal largely absent from the vertical tidal signal. Alternative explanations are discussed. These observations demonstrate that the ice shelf system is highly sensitive to relatively modest changes in forcing at its boundaries. Copyright 2011 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
King, MA Makinson, K Gudmundsson, GH |
author_facet |
King, MA Makinson, K Gudmundsson, GH |
author_sort |
King, MA |
title |
Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system |
title_short |
Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system |
title_full |
Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system |
title_fullStr |
Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system |
title_full_unstemmed |
Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system |
title_sort |
nonlinear interaction between ocean tides and the larsen c ice shelf system |
publisher |
Wiley-Blackwell Publishing, Inc. |
publishDate |
2011 |
url |
https://doi.org/10.1029/2011GL046680 http://ecite.utas.edu.au/82167 |
genre |
Ice Shelf |
genre_facet |
Ice Shelf |
op_relation |
http://dx.doi.org/10.1029/2011GL046680 King, MA and Makinson, K and Gudmundsson, GH, Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system, Geophysical Research Letters, 38, (8) Article L08501. ISSN 0094-8276 (2011) [Refereed Article] http://ecite.utas.edu.au/82167 |
op_doi |
https://doi.org/10.1029/2011GL046680 |
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Geophysical Research Letters |
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38 |
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8 |
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1766032227675668480 |