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...
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Online Access: | http://www.the-cryosphere.net/3/217/2009/tc-3-217-2009.pdf https://doaj.org/article/a19ecf0d63f449a1a8bd3215eb774072 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:a19ecf0d63f449a1a8bd3215eb774072 2023-05-15T16:22:11+02:00 Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard T. Zwinger J. C. Moore 2009-11-01 http://www.the-cryosphere.net/3/217/2009/tc-3-217-2009.pdf https://doaj.org/article/a19ecf0d63f449a1a8bd3215eb774072 en eng Copernicus Publications 1994-0416 1994-0424 http://www.the-cryosphere.net/3/217/2009/tc-3-217-2009.pdf https://doaj.org/article/a19ecf0d63f449a1a8bd3215eb774072 undefined The Cryosphere, Vol 3, Iss 2, Pp 217-229 (2009) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2009 fttriple 2023-01-22T17:49:42Z 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 Unknown Svalbard |
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language |
English |
topic |
geo envir |
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geo envir T. Zwinger J. C. Moore Diagnostic and prognostic simulations with a full Stokes model accounting for superimposed ice of Midtre Lovénbreen, Svalbard |
topic_facet |
geo envir |
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 |
T. Zwinger J. C. Moore |
author_facet |
T. Zwinger J. C. Moore |
author_sort |
T. Zwinger |
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 |
http://www.the-cryosphere.net/3/217/2009/tc-3-217-2009.pdf https://doaj.org/article/a19ecf0d63f449a1a8bd3215eb774072 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
glacier Svalbard The Cryosphere |
genre_facet |
glacier Svalbard The Cryosphere |
op_source |
The Cryosphere, Vol 3, Iss 2, Pp 217-229 (2009) |
op_relation |
1994-0416 1994-0424 http://www.the-cryosphere.net/3/217/2009/tc-3-217-2009.pdf https://doaj.org/article/a19ecf0d63f449a1a8bd3215eb774072 |
op_rights |
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1766010154431545344 |