Influence of channelling on heating in ice-sheet flows
Ice‐sheet flows can be channelled by perturbations in the basal topography or in the sliding coefficient. These lead to spatial variation in the steady profile, the flux and the dissipative heating. This paper examines the linearized theory of heating variations, showing that the map plane aspect ra...
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American Geophysical Union
2001
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Online Access: | http://nora.nerc.ac.uk/id/eprint/19431/ https://nora.nerc.ac.uk/id/eprint/19431/1/2000GL012666.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2000GL012666 |
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ftnerc:oai:nora.nerc.ac.uk:19431 2023-05-15T16:39:53+02:00 Influence of channelling on heating in ice-sheet flows Hindmarsh, Richard C.A. 2001-10 text http://nora.nerc.ac.uk/id/eprint/19431/ https://nora.nerc.ac.uk/id/eprint/19431/1/2000GL012666.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2000GL012666 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/19431/1/2000GL012666.pdf Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 . 2001 Influence of channelling on heating in ice-sheet flows. Geophysical Research Letters, 28 (19). 3681-3684. https://doi.org/10.1029/2000GL012666 <https://doi.org/10.1029/2000GL012666> Publication - Article PeerReviewed 2001 ftnerc https://doi.org/10.1029/2000GL012666 2023-02-04T19:32:17Z Ice‐sheet flows can be channelled by perturbations in the basal topography or in the sliding coefficient. These lead to spatial variation in the steady profile, the flux and the dissipative heating. This paper examines the linearized theory of heating variations, showing that the map plane aspect ratio of the basal perturbation has a dominating effect on the qualitative behaviour. For ribbing transverse to the direction of flow, maximum heating occurs over bedrock and sliding viscosity highs. When flow‐parallel channelling occurs maximum heating occurs over bedrock lows and sliding viscosity lows. These results are used to examine symmetry‐breaking behaviour of numerical thermoviscous ice‐sheet models in terms of a dissipation‐driven creep instability. Article in Journal/Newspaper Ice Sheet Natural Environment Research Council: NERC Open Research Archive Geophysical Research Letters 28 19 3681 3684 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
Ice‐sheet flows can be channelled by perturbations in the basal topography or in the sliding coefficient. These lead to spatial variation in the steady profile, the flux and the dissipative heating. This paper examines the linearized theory of heating variations, showing that the map plane aspect ratio of the basal perturbation has a dominating effect on the qualitative behaviour. For ribbing transverse to the direction of flow, maximum heating occurs over bedrock and sliding viscosity highs. When flow‐parallel channelling occurs maximum heating occurs over bedrock lows and sliding viscosity lows. These results are used to examine symmetry‐breaking behaviour of numerical thermoviscous ice‐sheet models in terms of a dissipation‐driven creep instability. |
format |
Article in Journal/Newspaper |
author |
Hindmarsh, Richard C.A. |
spellingShingle |
Hindmarsh, Richard C.A. Influence of channelling on heating in ice-sheet flows |
author_facet |
Hindmarsh, Richard C.A. |
author_sort |
Hindmarsh, Richard C.A. |
title |
Influence of channelling on heating in ice-sheet flows |
title_short |
Influence of channelling on heating in ice-sheet flows |
title_full |
Influence of channelling on heating in ice-sheet flows |
title_fullStr |
Influence of channelling on heating in ice-sheet flows |
title_full_unstemmed |
Influence of channelling on heating in ice-sheet flows |
title_sort |
influence of channelling on heating in ice-sheet flows |
publisher |
American Geophysical Union |
publishDate |
2001 |
url |
http://nora.nerc.ac.uk/id/eprint/19431/ https://nora.nerc.ac.uk/id/eprint/19431/1/2000GL012666.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2000GL012666 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/19431/1/2000GL012666.pdf Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 . 2001 Influence of channelling on heating in ice-sheet flows. Geophysical Research Letters, 28 (19). 3681-3684. https://doi.org/10.1029/2000GL012666 <https://doi.org/10.1029/2000GL012666> |
op_doi |
https://doi.org/10.1029/2000GL012666 |
container_title |
Geophysical Research Letters |
container_volume |
28 |
container_issue |
19 |
container_start_page |
3681 |
op_container_end_page |
3684 |
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1766030234106200064 |