Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa
The high-Alpine glacier saddle Colle Gnifetti (CG), Monte Rosa massif, is a unique drilling site in the European Alps offering continuous ice-core records on the millennial time-scale. However, the full interpretation ofthe ice-core time series is challenging due to the highly irregular (spatial and...
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ftawi:oai:epic.awi.de:49615 2023-05-15T16:38:37+02:00 Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa Licciulli, Carlo Bohleber, Pascal Lier, Josef Gagliardini, Olivier Hoelzle, Martin Eisen, Olaf Wagenbach, Dietmar 2018-04-11 application/pdf https://epic.awi.de/id/eprint/49615/ https://epic.awi.de/id/eprint/49615/1/EGU2018-9530-1.pdf https://hdl.handle.net/10013/epic.63cdbdbe-a946-4fc2-8548-5c26fa9f47fe https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/49615/1/EGU2018-9530-1.pdf https://hdl.handle.net/ Licciulli, C. , Bohleber, P. , Lier, J. , Gagliardini, O. , Hoelzle, M. , Eisen, O. orcid:0000-0002-6380-962X and Wagenbach, D. (2018) Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa , EGU General Assembly, Vienna, 8 April 2018 - 13 April 2018 . hdl:10013/epic.63cdbdbe-a946-4fc2-8548-5c26fa9f47fe EPIC3EGU General Assembly, Vienna, 2018-04-08-2018-04-13 Conference notRev 2018 ftawi 2021-12-24T15:44:42Z The high-Alpine glacier saddle Colle Gnifetti (CG), Monte Rosa massif, is a unique drilling site in the European Alps offering continuous ice-core records on the millennial time-scale. However, the full interpretation ofthe ice-core time series is challenging due to the highly irregular (spatial and temporal) snow deposition pattern and, together with a complex flow regime, upstream effects. In this context, we present results of a new three-dimensional full Stokes ice-flow model of the CG saddle. The main objectives of the modeling tool concern (a) the calculation of backward trajectories of existing ice-core drill sites, which is required in order to evaluate potential upstream effects, and (b) provide a reliable age–depth relation, in order to support experimental methods in ice-core dating.The established full Stokes model is fully thermo-mechanically coupled. The model includes firn rheology and firn densification. The temperature field is calculated using the enthalpy method, 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 glaciological measurements of surface velocities, snow accumulation, borehole inclination angles, density and englacial temperatures. Using the calculated backwards trajectories, the locations on the glacier surface of the ice-core source points are identified with an uncertainty of∼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 ice-core chronologiesare consistent with experimental dating results, based among others on annual layer counting and 14C measurements. Conference Object ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Monte Rosa ENVELOPE(162.850,162.850,-70.917,-70.917) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The high-Alpine glacier saddle Colle Gnifetti (CG), Monte Rosa massif, is a unique drilling site in the European Alps offering continuous ice-core records on the millennial time-scale. However, the full interpretation ofthe ice-core time series is challenging due to the highly irregular (spatial and temporal) snow deposition pattern and, together with a complex flow regime, upstream effects. In this context, we present results of a new three-dimensional full Stokes ice-flow model of the CG saddle. The main objectives of the modeling tool concern (a) the calculation of backward trajectories of existing ice-core drill sites, which is required in order to evaluate potential upstream effects, and (b) provide a reliable age–depth relation, in order to support experimental methods in ice-core dating.The established full Stokes model is fully thermo-mechanically coupled. The model includes firn rheology and firn densification. The temperature field is calculated using the enthalpy method, 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 glaciological measurements of surface velocities, snow accumulation, borehole inclination angles, density and englacial temperatures. Using the calculated backwards trajectories, the locations on the glacier surface of the ice-core source points are identified with an uncertainty of∼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 ice-core chronologiesare consistent with experimental dating results, based among others on annual layer counting and 14C measurements. |
format |
Conference Object |
author |
Licciulli, Carlo Bohleber, Pascal Lier, Josef Gagliardini, Olivier Hoelzle, Martin Eisen, Olaf Wagenbach, Dietmar |
spellingShingle |
Licciulli, Carlo Bohleber, Pascal Lier, Josef Gagliardini, Olivier Hoelzle, Martin Eisen, Olaf Wagenbach, Dietmar Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa |
author_facet |
Licciulli, Carlo Bohleber, Pascal Lier, Josef Gagliardini, Olivier Hoelzle, Martin Eisen, Olaf Wagenbach, Dietmar |
author_sort |
Licciulli, Carlo |
title |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa |
title_short |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa |
title_full |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa |
title_fullStr |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa |
title_full_unstemmed |
Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa |
title_sort |
full stokes ice-flow modeling of the high-alpine glacier saddle colle gnifetti, monte rosa |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/49615/ https://epic.awi.de/id/eprint/49615/1/EGU2018-9530-1.pdf https://hdl.handle.net/10013/epic.63cdbdbe-a946-4fc2-8548-5c26fa9f47fe https://hdl.handle.net/ |
long_lat |
ENVELOPE(162.850,162.850,-70.917,-70.917) |
geographic |
Monte Rosa |
geographic_facet |
Monte Rosa |
genre |
ice core |
genre_facet |
ice core |
op_source |
EPIC3EGU General Assembly, Vienna, 2018-04-08-2018-04-13 |
op_relation |
https://epic.awi.de/id/eprint/49615/1/EGU2018-9530-1.pdf https://hdl.handle.net/ Licciulli, C. , Bohleber, P. , Lier, J. , Gagliardini, O. , Hoelzle, M. , Eisen, O. orcid:0000-0002-6380-962X and Wagenbach, D. (2018) Full Stokes ice-flow modeling of the high-Alpine glacier saddle Colle Gnifetti, Monte Rosa , EGU General Assembly, Vienna, 8 April 2018 - 13 April 2018 . hdl:10013/epic.63cdbdbe-a946-4fc2-8548-5c26fa9f47fe |
_version_ |
1766028918752542720 |