Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input
ABSTRACT We evaluate the variability in basal friction for Kronebreen, Svalbard, a fast-flowing tidewater glacier. We invert 3 years (2013–15) of surface velocities at high temporal resolution (generally 11 days), to estimate the changing basal properties of the glacier. Our results suggest that sli...
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Language: | English |
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/jog.2017.69 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000697 |
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crcambridgeupr:10.1017/jog.2017.69 2024-09-15T18:07:56+00:00 Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input VALLOT, DOROTHÉE PETTERSSON, RICKARD LUCKMAN, ADRIAN BENN, DOUGLAS I. ZWINGER, THOMAS VAN PELT, WARD J. J. KOHLER, JACK SCHÄFER, MARTINA CLAREMAR, BJÖRN HULTON, NICHOLAS R. J. 2017 http://dx.doi.org/10.1017/jog.2017.69 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000697 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 63, issue 242, page 1012-1024 ISSN 0022-1430 1727-5652 journal-article 2017 crcambridgeupr https://doi.org/10.1017/jog.2017.69 2024-07-17T04:03:34Z ABSTRACT We evaluate the variability in basal friction for Kronebreen, Svalbard, a fast-flowing tidewater glacier. We invert 3 years (2013–15) of surface velocities at high temporal resolution (generally 11 days), to estimate the changing basal properties of the glacier. Our results suggest that sliding behaviour of Kronebreen within a year is primarily influenced by changes in water input patterns during the meltwater season and basal friction is highly variable from a year to another. At present, models usually employ parameterisations to encompass the complex physics of glacier sliding by mathematically simulate their net effect. For such ice masses with strong seasonal variations of surface melt, the spatio-temporal patterns of basal friction imply that it is neither possible nor appropriate to use a parameterisation for bed friction that is fixed in space and/or time, at least in a timescale of a few years. Basal sliding may not only be governed by local processes such as basal topography or summer melt, but also be mediated by factors that vary over a larger distance and over a longer time period such as subglacial hydrology organisation, ice-thickness changes or calving front geometry. Article in Journal/Newspaper glacier Journal of Glaciology Svalbard Tidewater Cambridge University Press Journal of Glaciology 63 242 1012 1024 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
ABSTRACT We evaluate the variability in basal friction for Kronebreen, Svalbard, a fast-flowing tidewater glacier. We invert 3 years (2013–15) of surface velocities at high temporal resolution (generally 11 days), to estimate the changing basal properties of the glacier. Our results suggest that sliding behaviour of Kronebreen within a year is primarily influenced by changes in water input patterns during the meltwater season and basal friction is highly variable from a year to another. At present, models usually employ parameterisations to encompass the complex physics of glacier sliding by mathematically simulate their net effect. For such ice masses with strong seasonal variations of surface melt, the spatio-temporal patterns of basal friction imply that it is neither possible nor appropriate to use a parameterisation for bed friction that is fixed in space and/or time, at least in a timescale of a few years. Basal sliding may not only be governed by local processes such as basal topography or summer melt, but also be mediated by factors that vary over a larger distance and over a longer time period such as subglacial hydrology organisation, ice-thickness changes or calving front geometry. |
format |
Article in Journal/Newspaper |
author |
VALLOT, DOROTHÉE PETTERSSON, RICKARD LUCKMAN, ADRIAN BENN, DOUGLAS I. ZWINGER, THOMAS VAN PELT, WARD J. J. KOHLER, JACK SCHÄFER, MARTINA CLAREMAR, BJÖRN HULTON, NICHOLAS R. J. |
spellingShingle |
VALLOT, DOROTHÉE PETTERSSON, RICKARD LUCKMAN, ADRIAN BENN, DOUGLAS I. ZWINGER, THOMAS VAN PELT, WARD J. J. KOHLER, JACK SCHÄFER, MARTINA CLAREMAR, BJÖRN HULTON, NICHOLAS R. J. Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input |
author_facet |
VALLOT, DOROTHÉE PETTERSSON, RICKARD LUCKMAN, ADRIAN BENN, DOUGLAS I. ZWINGER, THOMAS VAN PELT, WARD J. J. KOHLER, JACK SCHÄFER, MARTINA CLAREMAR, BJÖRN HULTON, NICHOLAS R. J. |
author_sort |
VALLOT, DOROTHÉE |
title |
Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input |
title_short |
Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input |
title_full |
Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input |
title_fullStr |
Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input |
title_full_unstemmed |
Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard: non-local spatio-temporal response to water input |
title_sort |
basal dynamics of kronebreen, a fast-flowing tidewater glacier in svalbard: non-local spatio-temporal response to water input |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/jog.2017.69 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000697 |
genre |
glacier Journal of Glaciology Svalbard Tidewater |
genre_facet |
glacier Journal of Glaciology Svalbard Tidewater |
op_source |
Journal of Glaciology volume 63, issue 242, page 1012-1024 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2017.69 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
242 |
container_start_page |
1012 |
op_container_end_page |
1024 |
_version_ |
1810445287375765504 |