Incorporating modelled subglacial hydrology into inversions for basal drag
A key challenge in modelling coupled ice-flow–subglacial hydrology is initializing the state and parameters of the system. We address this problem by presenting a workflow for initializing these values at the start of a summer melt season. The workflow depends on running a subglacial hydrology model...
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2017
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ftdoajarticles:oai:doaj.org/article:1fa72e3fe48644b88b6e4b92ae6cebaf 2023-05-15T18:32:25+02:00 Incorporating modelled subglacial hydrology into inversions for basal drag C. P. Koziol N. Arnold 2017-12-01T00:00:00Z https://doi.org/10.5194/tc-11-2783-2017 https://doaj.org/article/1fa72e3fe48644b88b6e4b92ae6cebaf EN eng Copernicus Publications https://www.the-cryosphere.net/11/2783/2017/tc-11-2783-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-2783-2017 1994-0416 1994-0424 https://doaj.org/article/1fa72e3fe48644b88b6e4b92ae6cebaf The Cryosphere, Vol 11, Pp 2783-2797 (2017) Environmental sciences GE1-350 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/tc-11-2783-2017 2022-12-31T05:54:55Z A key challenge in modelling coupled ice-flow–subglacial hydrology is initializing the state and parameters of the system. We address this problem by presenting a workflow for initializing these values at the start of a summer melt season. The workflow depends on running a subglacial hydrology model for the winter season, when the system is not forced by meltwater inputs, and ice velocities can be assumed constant. Key parameters of the winter run of the subglacial hydrology model are determined from an initial inversion for basal drag using a linear sliding law. The state of the subglacial hydrology model at the end of winter is incorporated into an inversion of basal drag using a non-linear sliding law which is a function of water pressure. We demonstrate this procedure in the Russell Glacier area and compare the output of the linear sliding law with two non-linear sliding laws. Additionally, we compare the modelled winter hydrological state to radar observations and find that it is in line with summer rather than winter observations. Article in Journal/Newspaper The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 11 6 2783 2797 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 C. P. Koziol N. Arnold Incorporating modelled subglacial hydrology into inversions for basal drag |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
A key challenge in modelling coupled ice-flow–subglacial hydrology is initializing the state and parameters of the system. We address this problem by presenting a workflow for initializing these values at the start of a summer melt season. The workflow depends on running a subglacial hydrology model for the winter season, when the system is not forced by meltwater inputs, and ice velocities can be assumed constant. Key parameters of the winter run of the subglacial hydrology model are determined from an initial inversion for basal drag using a linear sliding law. The state of the subglacial hydrology model at the end of winter is incorporated into an inversion of basal drag using a non-linear sliding law which is a function of water pressure. We demonstrate this procedure in the Russell Glacier area and compare the output of the linear sliding law with two non-linear sliding laws. Additionally, we compare the modelled winter hydrological state to radar observations and find that it is in line with summer rather than winter observations. |
format |
Article in Journal/Newspaper |
author |
C. P. Koziol N. Arnold |
author_facet |
C. P. Koziol N. Arnold |
author_sort |
C. P. Koziol |
title |
Incorporating modelled subglacial hydrology into inversions for basal drag |
title_short |
Incorporating modelled subglacial hydrology into inversions for basal drag |
title_full |
Incorporating modelled subglacial hydrology into inversions for basal drag |
title_fullStr |
Incorporating modelled subglacial hydrology into inversions for basal drag |
title_full_unstemmed |
Incorporating modelled subglacial hydrology into inversions for basal drag |
title_sort |
incorporating modelled subglacial hydrology into inversions for basal drag |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-2783-2017 https://doaj.org/article/1fa72e3fe48644b88b6e4b92ae6cebaf |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 11, Pp 2783-2797 (2017) |
op_relation |
https://www.the-cryosphere.net/11/2783/2017/tc-11-2783-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-2783-2017 1994-0416 1994-0424 https://doaj.org/article/1fa72e3fe48644b88b6e4b92ae6cebaf |
op_doi |
https://doi.org/10.5194/tc-11-2783-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
6 |
container_start_page |
2783 |
op_container_end_page |
2797 |
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1766216523615043584 |