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 similar to 182 days, including semi-diurnal, diurnal and similar to 14.76 days. At fortnightly periods the ice shelf varies by +/- 10% from i...
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American Geophysical Union
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ftnerc:oai:nora.nerc.ac.uk:14491 2023-05-15T16:41:45+02:00 Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system King, Matt A. Makinson, Keith Gudmundsson, G. Hilmar 2011 text http://nora.nerc.ac.uk/id/eprint/14491/ https://nora.nerc.ac.uk/id/eprint/14491/1/grl27879.pdf en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/14491/1/grl27879.pdf King, Matt A.; Makinson, Keith orcid:0000-0002-5791-1767 Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 . 2011 Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system. Geophysical Research Letters, 38 (8), L08501. 5, pp. https://doi.org/10.1029/2011GL046680 <https://doi.org/10.1029/2011GL046680> Marine Sciences Glaciology Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1029/2011GL046680 2023-02-04T19:29:14Z 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 similar to 182 days, including semi-diurnal, diurnal and similar to 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. Article in Journal/Newspaper Ice Shelf Natural Environment Research Council: NERC Open Research Archive Geophysical Research Letters 38 8 n/a n/a |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences Glaciology |
spellingShingle |
Marine Sciences Glaciology King, Matt A. Makinson, Keith Gudmundsson, G. Hilmar Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system |
topic_facet |
Marine Sciences Glaciology |
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 similar to 182 days, including semi-diurnal, diurnal and similar to 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. |
format |
Article in Journal/Newspaper |
author |
King, Matt A. Makinson, Keith Gudmundsson, G. Hilmar |
author_facet |
King, Matt A. Makinson, Keith Gudmundsson, G. Hilmar |
author_sort |
King, Matt A. |
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 |
American Geophysical Union |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/14491/ https://nora.nerc.ac.uk/id/eprint/14491/1/grl27879.pdf |
genre |
Ice Shelf |
genre_facet |
Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/14491/1/grl27879.pdf King, Matt A.; Makinson, Keith orcid:0000-0002-5791-1767 Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 . 2011 Nonlinear interaction between ocean tides and the Larsen C Ice Shelf system. Geophysical Research Letters, 38 (8), L08501. 5, pp. https://doi.org/10.1029/2011GL046680 <https://doi.org/10.1029/2011GL046680> |
op_doi |
https://doi.org/10.1029/2011GL046680 |
container_title |
Geophysical Research Letters |
container_volume |
38 |
container_issue |
8 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766032211506626560 |