Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records
The high-Alpine glacier saddle Colle Gnifetti (CG), Monte Rosa massif, is the only cold glacier archive in the European Alps offering detailed ice-core records on the millennial-scale. However, the highly irregular snow deposition pattern and the complex flow regime produce depositional noise and up...
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ftunivheidelb:oai:archiv.ub.uni-heidelberg.de:23981 2023-11-05T03:42:37+01:00 Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records Licciulli, Carlo 2018 application/pdf https://archiv.ub.uni-heidelberg.de/volltextserver/23981/ https://archiv.ub.uni-heidelberg.de/volltextserver/23981/1/Dissertation_Licciulli_2018.pdf https://doi.org/10.11588/heidok.00023981 https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-239812 eng eng https://archiv.ub.uni-heidelberg.de/volltextserver/23981/1/Dissertation_Licciulli_2018.pdf doi:10.11588/heidok.00023981 urn:nbn:de:bsz:16-heidok-239812 Licciulli, Carlo (2018) Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records. [Dissertation] info:eu-repo/semantics/openAccess http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html 530 530 Physics Dissertation info:eu-repo/semantics/doctoralThesis NonPeerReviewed 2018 ftunivheidelb https://doi.org/10.11588/heidok.00023981 2023-10-10T12:08:31Z The high-Alpine glacier saddle Colle Gnifetti (CG), Monte Rosa massif, is the only cold glacier archive in the European Alps offering detailed ice-core records on the millennial-scale. However, the highly irregular snow deposition pattern and the complex flow regime produce depositional noise and upstream effects, which hinder the full interpretation of the ice-core records in terms of past atmospheric changes. In this context, this work focuses on establishing a three-dimensional full Stokes ice-flow model of the CG saddle, with the main objective to calculate precise backward trajectories of existing ice-core sites, which is necessary to evaluate potential upstream effects. The developed full Stokes model is fully thermomechanically coupled and includes firn rheology, firn densification and enthalpy transport, with consideration of atmospheric temperature changes of the last century, strain heating and surface meltwater refreezing. The simulations are performed using the state-of-the-art Finite Element software Elmer/Ice. The CG full Stokes model is validated by comparison with measurements of surface velocities, accumulation, annual layer thickness, borehole inclination angles, density and temperature. Estimated using different bedrock topographies, the error of the calculated source point positions on the glacier surface amounts to ~10% of the distance to the corresponding drill site. Moreover, the three-dimensional age field of the glacier is calculated with an uncertainty of ~20%. The calculated chronologies of four out of five ice cores are consistent with experimental dating results, based among others on layer counting and 14C measurements. Doctoral or Postdoctoral Thesis ice core Heidelberg University: HeiDok |
institution |
Open Polar |
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Heidelberg University: HeiDok |
op_collection_id |
ftunivheidelb |
language |
English |
topic |
530 530 Physics |
spellingShingle |
530 530 Physics Licciulli, Carlo Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records |
topic_facet |
530 530 Physics |
description |
The high-Alpine glacier saddle Colle Gnifetti (CG), Monte Rosa massif, is the only cold glacier archive in the European Alps offering detailed ice-core records on the millennial-scale. However, the highly irregular snow deposition pattern and the complex flow regime produce depositional noise and upstream effects, which hinder the full interpretation of the ice-core records in terms of past atmospheric changes. In this context, this work focuses on establishing a three-dimensional full Stokes ice-flow model of the CG saddle, with the main objective to calculate precise backward trajectories of existing ice-core sites, which is necessary to evaluate potential upstream effects. The developed full Stokes model is fully thermomechanically coupled and includes firn rheology, firn densification and enthalpy transport, with consideration of atmospheric temperature changes of the last century, strain heating and surface meltwater refreezing. The simulations are performed using the state-of-the-art Finite Element software Elmer/Ice. The CG full Stokes model is validated by comparison with measurements of surface velocities, accumulation, annual layer thickness, borehole inclination angles, density and temperature. Estimated using different bedrock topographies, the error of the calculated source point positions on the glacier surface amounts to ~10% of the distance to the corresponding drill site. Moreover, the three-dimensional age field of the glacier is calculated with an uncertainty of ~20%. The calculated chronologies of four out of five ice cores are consistent with experimental dating results, based among others on layer counting and 14C measurements. |
format |
Doctoral or Postdoctoral Thesis |
author |
Licciulli, Carlo |
author_facet |
Licciulli, Carlo |
author_sort |
Licciulli, Carlo |
title |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records |
title_short |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records |
title_full |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records |
title_fullStr |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records |
title_full_unstemmed |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records |
title_sort |
full stokes ice-flow modeling of the high-alpine glacier saddle colle gnifetti, monte rosa: flow field characterization for an improved interpretation of the ice-core records |
publishDate |
2018 |
url |
https://archiv.ub.uni-heidelberg.de/volltextserver/23981/ https://archiv.ub.uni-heidelberg.de/volltextserver/23981/1/Dissertation_Licciulli_2018.pdf https://doi.org/10.11588/heidok.00023981 https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-239812 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
https://archiv.ub.uni-heidelberg.de/volltextserver/23981/1/Dissertation_Licciulli_2018.pdf doi:10.11588/heidok.00023981 urn:nbn:de:bsz:16-heidok-239812 Licciulli, Carlo (2018) Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa: Flow field characterization for an improved interpretation of the ice-core records. [Dissertation] |
op_rights |
info:eu-repo/semantics/openAccess http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html |
op_doi |
https://doi.org/10.11588/heidok.00023981 |
_version_ |
1781699899001143296 |