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-...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/398601 2023-05-15T16:41:01+02:00 Modelling a paleo valley glacier network using a hybrid model: an assessment with a Stokes ice flow model Imhof, Michael Cohen, Denis Seguinot, Julien Aschwanden, Andy Funk, Martin Jouvet, Guillaume 2019-12 application/application/pdf https://hdl.handle.net/20.500.11850/398601 https://doi.org/10.3929/ethz-b-000398601 en eng International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2019.77 info:eu-repo/semantics/altIdentifier/wos/000510631500011 info:eu-repo/grantAgreement/SNF/Projekte MINT/162444 info:eu-repo/grantAgreement/SNF/Projekte MINT/169558 info:eu-repo/grantAgreement/SNF/Projektförderung in Mathematik, Natur- und Ingenieurwissenschaften (Abteilung II)/153179 http://hdl.handle.net/20.500.11850/398601 doi:10.3929/ethz-b-000398601 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Journal of Glaciology, 65 (254) mountain glaciers ice dynamics glacier mechanics glacier modelling info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftethz https://doi.org/20.500.11850/398601 https://doi.org/10.3929/ethz-b-000398601 https://doi.org/10.1017/jog.2019.77 2022-04-25T14:02:38Z 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. ISSN:0022-1430 ISSN:1727-5652 Article in Journal/Newspaper Ice Sheet Journal of Glaciology ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
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ftethz |
language |
English |
topic |
mountain glaciers ice dynamics glacier mechanics glacier modelling |
spellingShingle |
mountain glaciers ice dynamics glacier mechanics glacier modelling Imhof, Michael Cohen, Denis Seguinot, Julien Aschwanden, Andy Funk, Martin Jouvet, Guillaume 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 |
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. ISSN:0022-1430 ISSN:1727-5652 |
format |
Article in Journal/Newspaper |
author |
Imhof, Michael Cohen, Denis Seguinot, Julien Aschwanden, Andy Funk, Martin Jouvet, Guillaume |
author_facet |
Imhof, Michael Cohen, Denis Seguinot, Julien Aschwanden, Andy Funk, Martin Jouvet, Guillaume |
author_sort |
Imhof, Michael |
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 |
International Glaciological Society |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11850/398601 https://doi.org/10.3929/ethz-b-000398601 |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, 65 (254) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2019.77 info:eu-repo/semantics/altIdentifier/wos/000510631500011 info:eu-repo/grantAgreement/SNF/Projekte MINT/162444 info:eu-repo/grantAgreement/SNF/Projekte MINT/169558 info:eu-repo/grantAgreement/SNF/Projektförderung in Mathematik, Natur- und Ingenieurwissenschaften (Abteilung II)/153179 http://hdl.handle.net/20.500.11850/398601 doi:10.3929/ethz-b-000398601 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/398601 https://doi.org/10.3929/ethz-b-000398601 https://doi.org/10.1017/jog.2019.77 |
_version_ |
1766031451772420096 |