Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia
Flow at ice divides, their shape, size and internal structure depend not only on local conditions, but also on the flow regimes and past histories of the surrounding ice masses. Here we use field data from Kealey Ice Rise, Ellsworth Land, West Antarctica, in combination with flow modelling to invest...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/501872/ https://nora.nerc.ac.uk/id/eprint/501872/1/Martin%20et%20al%202014.pdf |
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ftnerc:oai:nora.nerc.ac.uk:501872 2023-05-15T13:48:07+02:00 Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia Martín, Carlos Gudmundsson, G. Hilmar King, Edward C. 2014-01 text http://nora.nerc.ac.uk/id/eprint/501872/ https://nora.nerc.ac.uk/id/eprint/501872/1/Martin%20et%20al%202014.pdf en eng https://nora.nerc.ac.uk/id/eprint/501872/1/Martin%20et%20al%202014.pdf Martín, Carlos orcid:0000-0002-2661-169X Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 King, Edward C. orcid:0000-0003-3793-3915 . 2014 Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia. Journal of Glaciology, 60 (219). 139-146. https://doi.org/10.3189/2014JoG13J089 <https://doi.org/10.3189/2014JoG13J089> Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.3189/2014JoG13J089 2023-02-04T19:36:56Z Flow at ice divides, their shape, size and internal structure depend not only on local conditions, but also on the flow regimes and past histories of the surrounding ice masses. Here we use field data from Kealey Ice Rise, Ellsworth Land, West Antarctica, in combination with flow modelling to investigate any possible signs of transients in the flow of the surrounding ice masses. Kealey Ice Rise shows linear surface features running parallel to its ridge in satellite imagery and a conspicuous layering in the ground-penetrating radar data known as double-peaked Raymond bumps. Through numerical modelling, by using an anisotropic full-Stokes thermomechanical flow solver, we analyse the evolution of Kealey Ice Rise and the timescales involved. We conclude that the features observed in the stratigraphy of Kealey Ice Rise require at least 3 ka of near-stationary flow conditions. However, we cannot exclude the possibility of a recent flow reorganization in the last century. We stress that the signs of stationary flow in radar stratigraphy observed in Kealey Ice Rise have been observed in other ice divides in the East Ellsworth Land area, suggesting stationary flow conditions over a millennial timescale in the region. Article in Journal/Newspaper Antarc* Antarctica Journal of Glaciology West Antarctica Natural Environment Research Council: NERC Open Research Archive West Antarctica Ellsworth Land ENVELOPE(-85.000,-85.000,-75.000,-75.000) Kealey Ice Rise ENVELOPE(-83.000,-83.000,-77.000,-77.000) Journal of Glaciology 60 219 139 146 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Flow at ice divides, their shape, size and internal structure depend not only on local conditions, but also on the flow regimes and past histories of the surrounding ice masses. Here we use field data from Kealey Ice Rise, Ellsworth Land, West Antarctica, in combination with flow modelling to investigate any possible signs of transients in the flow of the surrounding ice masses. Kealey Ice Rise shows linear surface features running parallel to its ridge in satellite imagery and a conspicuous layering in the ground-penetrating radar data known as double-peaked Raymond bumps. Through numerical modelling, by using an anisotropic full-Stokes thermomechanical flow solver, we analyse the evolution of Kealey Ice Rise and the timescales involved. We conclude that the features observed in the stratigraphy of Kealey Ice Rise require at least 3 ka of near-stationary flow conditions. However, we cannot exclude the possibility of a recent flow reorganization in the last century. We stress that the signs of stationary flow in radar stratigraphy observed in Kealey Ice Rise have been observed in other ice divides in the East Ellsworth Land area, suggesting stationary flow conditions over a millennial timescale in the region. |
format |
Article in Journal/Newspaper |
author |
Martín, Carlos Gudmundsson, G. Hilmar King, Edward C. |
spellingShingle |
Martín, Carlos Gudmundsson, G. Hilmar King, Edward C. Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia |
author_facet |
Martín, Carlos Gudmundsson, G. Hilmar King, Edward C. |
author_sort |
Martín, Carlos |
title |
Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia |
title_short |
Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia |
title_full |
Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia |
title_fullStr |
Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia |
title_full_unstemmed |
Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia |
title_sort |
modelling of kealey ice rise, antarctica, reveals stable ice-flow conditions in east ellsworth land over the millennia |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/501872/ https://nora.nerc.ac.uk/id/eprint/501872/1/Martin%20et%20al%202014.pdf |
long_lat |
ENVELOPE(-85.000,-85.000,-75.000,-75.000) ENVELOPE(-83.000,-83.000,-77.000,-77.000) |
geographic |
West Antarctica Ellsworth Land Kealey Ice Rise |
geographic_facet |
West Antarctica Ellsworth Land Kealey Ice Rise |
genre |
Antarc* Antarctica Journal of Glaciology West Antarctica |
genre_facet |
Antarc* Antarctica Journal of Glaciology West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/501872/1/Martin%20et%20al%202014.pdf Martín, Carlos orcid:0000-0002-2661-169X Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 King, Edward C. orcid:0000-0003-3793-3915 . 2014 Modelling of Kealey Ice Rise, Antarctica, reveals stable ice-flow conditions in East Ellsworth Land over the millennia. Journal of Glaciology, 60 (219). 139-146. https://doi.org/10.3189/2014JoG13J089 <https://doi.org/10.3189/2014JoG13J089> |
op_doi |
https://doi.org/10.3189/2014JoG13J089 |
container_title |
Journal of Glaciology |
container_volume |
60 |
container_issue |
219 |
container_start_page |
139 |
op_container_end_page |
146 |
_version_ |
1766248641616412672 |