Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard
We present steady state (diagnostic) and transient (prognostic) simulations of Midtre Lovénbreen, Svalbard performed with the thermo-mechanically coupled full-Stokes code Elmer. This glacier has an extensive data set of geophysical measurements available spanning several decades, that allow for cons...
Published in: | The Cryosphere |
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Copernicus Publications
2009
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00029558 2023-05-15T16:22:11+02:00 Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard Zwinger, T. Moore, J. C. 2009-11 electronic https://doi.org/10.5194/tc-3-217-2009 https://noa.gwlb.de/receive/cop_mods_00029558 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029513/tc-3-217-2009.pdf https://tc.copernicus.org/articles/3/217/2009/tc-3-217-2009.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-3-217-2009 https://noa.gwlb.de/receive/cop_mods_00029558 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029513/tc-3-217-2009.pdf https://tc.copernicus.org/articles/3/217/2009/tc-3-217-2009.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2009 ftnonlinearchiv https://doi.org/10.5194/tc-3-217-2009 2022-02-08T22:47:40Z We present steady state (diagnostic) and transient (prognostic) simulations of Midtre Lovénbreen, Svalbard performed with the thermo-mechanically coupled full-Stokes code Elmer. This glacier has an extensive data set of geophysical measurements available spanning several decades, that allow for constraints on model descriptions. Consistent with this data set, we included a simple model accounting for the formation of superimposed ice. Diagnostic results indicated that a dynamic adaptation of the free surface is necessary, to prevent non-physically high velocities in a region of under determined bedrock depths. Observations from ground penetrating radar of the basal thermal state agree very well with model predictions, while the dip angles of isochrones in radar data also match reasonably well with modelled isochrones, despite the numerical deficiencies of estimating ages with a steady state model. Prognostic runs for 53 years, using a constant accumulation/ablation pattern starting from the steady state solution obtained from the configuration of the 1977 DEM show that: 1 the unrealistic velocities in the under determined parts of the DEM quickly damp out; 2 the free surface evolution matches well measured elevation changes; 3 the retreat of the glacier under this scenario continues with the glacier tongue in a projection to 2030 being situated ≈500 m behind the position in 1977. Article in Journal/Newspaper glacier Svalbard The Cryosphere Niedersächsisches Online-Archiv NOA Svalbard The Cryosphere 3 2 217 229 |
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Niedersächsisches Online-Archiv NOA |
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language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Zwinger, T. Moore, J. C. Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard |
topic_facet |
article Verlagsveröffentlichung |
description |
We present steady state (diagnostic) and transient (prognostic) simulations of Midtre Lovénbreen, Svalbard performed with the thermo-mechanically coupled full-Stokes code Elmer. This glacier has an extensive data set of geophysical measurements available spanning several decades, that allow for constraints on model descriptions. Consistent with this data set, we included a simple model accounting for the formation of superimposed ice. Diagnostic results indicated that a dynamic adaptation of the free surface is necessary, to prevent non-physically high velocities in a region of under determined bedrock depths. Observations from ground penetrating radar of the basal thermal state agree very well with model predictions, while the dip angles of isochrones in radar data also match reasonably well with modelled isochrones, despite the numerical deficiencies of estimating ages with a steady state model. Prognostic runs for 53 years, using a constant accumulation/ablation pattern starting from the steady state solution obtained from the configuration of the 1977 DEM show that: 1 the unrealistic velocities in the under determined parts of the DEM quickly damp out; 2 the free surface evolution matches well measured elevation changes; 3 the retreat of the glacier under this scenario continues with the glacier tongue in a projection to 2030 being situated ≈500 m behind the position in 1977. |
format |
Article in Journal/Newspaper |
author |
Zwinger, T. Moore, J. C. |
author_facet |
Zwinger, T. Moore, J. C. |
author_sort |
Zwinger, T. |
title |
Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard |
title_short |
Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard |
title_full |
Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard |
title_fullStr |
Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard |
title_full_unstemmed |
Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard |
title_sort |
diagnostic and prognostic simulations with a full stokes model accounting for superimposed ice of midtre lovénbreen, svalbard |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doi.org/10.5194/tc-3-217-2009 https://noa.gwlb.de/receive/cop_mods_00029558 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029513/tc-3-217-2009.pdf https://tc.copernicus.org/articles/3/217/2009/tc-3-217-2009.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
glacier Svalbard The Cryosphere |
genre_facet |
glacier Svalbard The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-3-217-2009 https://noa.gwlb.de/receive/cop_mods_00029558 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029513/tc-3-217-2009.pdf https://tc.copernicus.org/articles/3/217/2009/tc-3-217-2009.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-3-217-2009 |
container_title |
The Cryosphere |
container_volume |
3 |
container_issue |
2 |
container_start_page |
217 |
op_container_end_page |
229 |
_version_ |
1766010152956198912 |