Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model
Modelling paleo-glacier networks in mountain ranges on the millennial timescales requires ice flow approximations. Hybrid models calculating ice flow by combining vertical shearing (shallow ice approximation) and longitudinal stretching (shallow shelf approximation) have been applied to model paleo-...
Published in: | Journal of Glaciology |
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Cambridge University Press
2019
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Online Access: | https://doi.org/10.1017/jog.2019.77 https://doaj.org/article/8cdeb280a92248bebf86eac132aeee6c |
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ftdoajarticles:oai:doaj.org/article:8cdeb280a92248bebf86eac132aeee6c 2023-05-15T16:41:03+02:00 Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model Michael A. Imhof Denis Cohen Julien Seguinot Andy Aschwanden Martin Funk Guillaume Jouvet 2019-12-01T00:00:00Z https://doi.org/10.1017/jog.2019.77 https://doaj.org/article/8cdeb280a92248bebf86eac132aeee6c EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143019000777/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.77 0022-1430 1727-5652 https://doaj.org/article/8cdeb280a92248bebf86eac132aeee6c Journal of Glaciology, Vol 65, Pp 1000-1010 (2019) Mountain glaciers ice dynamics glacier mechanics glacier modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/jog.2019.77 2023-03-12T01:30:57Z Modelling paleo-glacier networks in mountain ranges on the millennial timescales requires ice flow approximations. Hybrid models calculating ice flow by combining vertical shearing (shallow ice approximation) and longitudinal stretching (shallow shelf approximation) have been applied to model paleo-glacier networks on steep terrain, yet their validity has not yet been assessed quantitatively. Moreover, hybrid models consistently yield higher ice thicknesses than Last Glacial Maximum geomorphological reconstructions in the European Alps. Here, we compare results based on the hybrid Parallel Ice Sheet Model (PISM) and the Stokes model Elmer/Ice on the Rhine Glacier, a catchment of the former European Alpine Icefield. For PISM, we also test two magnitudes of flux limitation in a scheme that reduces shearing velocities. We find that the flux limitation typically used in PISM yields significantly reduced shearing speeds and increases ice thicknesses by up to 500 m, partly explaining previous overestimations. However, reducing the ice flux limitation allows the hybrid model to minimize this mismatch and captures sliding speeds, ice thicknesses, ice extent and basal temperatures in close agreement with those obtained with the Stokes model. Article in Journal/Newspaper Ice Sheet Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 65 254 1000 1010 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Mountain glaciers ice dynamics glacier mechanics glacier modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Mountain glaciers ice dynamics glacier mechanics glacier modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Michael A. Imhof Denis Cohen Julien Seguinot Andy Aschwanden Martin Funk Guillaume Jouvet Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model |
topic_facet |
Mountain glaciers ice dynamics glacier mechanics glacier modelling Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Modelling paleo-glacier networks in mountain ranges on the millennial timescales requires ice flow approximations. Hybrid models calculating ice flow by combining vertical shearing (shallow ice approximation) and longitudinal stretching (shallow shelf approximation) have been applied to model paleo-glacier networks on steep terrain, yet their validity has not yet been assessed quantitatively. Moreover, hybrid models consistently yield higher ice thicknesses than Last Glacial Maximum geomorphological reconstructions in the European Alps. Here, we compare results based on the hybrid Parallel Ice Sheet Model (PISM) and the Stokes model Elmer/Ice on the Rhine Glacier, a catchment of the former European Alpine Icefield. For PISM, we also test two magnitudes of flux limitation in a scheme that reduces shearing velocities. We find that the flux limitation typically used in PISM yields significantly reduced shearing speeds and increases ice thicknesses by up to 500 m, partly explaining previous overestimations. However, reducing the ice flux limitation allows the hybrid model to minimize this mismatch and captures sliding speeds, ice thicknesses, ice extent and basal temperatures in close agreement with those obtained with the Stokes model. |
format |
Article in Journal/Newspaper |
author |
Michael A. Imhof Denis Cohen Julien Seguinot Andy Aschwanden Martin Funk Guillaume Jouvet |
author_facet |
Michael A. Imhof Denis Cohen Julien Seguinot Andy Aschwanden Martin Funk Guillaume Jouvet |
author_sort |
Michael A. Imhof |
title |
Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model |
title_short |
Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model |
title_full |
Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model |
title_fullStr |
Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model |
title_full_unstemmed |
Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model |
title_sort |
modelling a paleo valley glacier network using a hybrid model: an assessment with a stokes ice flow model |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/jog.2019.77 https://doaj.org/article/8cdeb280a92248bebf86eac132aeee6c |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 65, Pp 1000-1010 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143019000777/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.77 0022-1430 1727-5652 https://doaj.org/article/8cdeb280a92248bebf86eac132aeee6c |
op_doi |
https://doi.org/10.1017/jog.2019.77 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
254 |
container_start_page |
1000 |
op_container_end_page |
1010 |
_version_ |
1766031493385158656 |