Pine Island Glacier : a 3D full-Stokes model study
Mass loss from the Antarctic Ice Sheet is found to significantly contribute to eustatic sea level rise, due to a dynamic response in the system. Pine Island Glacier, a fast flowing outlet glacier in the West Antarctic Ice Sheet, is located in the Amundsen Sea Embayment Area, where the present Antarc...
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Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky
2014
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ftsubhamburg:oai:ediss.sub.uni-hamburg.de:ediss/5397 2023-05-15T13:24:19+02:00 Pine Island Glacier : a 3D full-Stokes model study Pine Island Gletscher : eine 3D full-Stokes Modelstudie Wilkens, Nina Humbert, Angelika (Prof. Dr.) 2014-01-01 http://nbn-resolving.de/urn:nbn:de:gbv:18-67350 https://ediss.sub.uni-hamburg.de/handle/ediss/5397 eng eng Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky http://nbn-resolving.de/urn:nbn:de:gbv:18-67350 https://ediss.sub.uni-hamburg.de/handle/ediss/5397 http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess No license Pine Island Gletscher Westantarktisches Eisschild Marines Eisschild full-Stokes Model Basales Gleiten Glaciology Antarctica Ice dynamics Modelling Pine Island Glacier 550 Geowissenschaften 30.03 Methoden und Techniken in den Naturwissenschaften 31.76 Numerische Mathematik 31.80 Angewandte Mathematik 33.14 Kontinuumsphysik 38.43 Gletscherkunde Glaziologie Modellierung Antarktis Gletscher Eis Strömungsmechanik Finite-Elemente-Methode Kontinuumsmechanik ddc:550 doctoralThesis doc-type:doctoralThesis 2014 ftsubhamburg 2023-02-19T23:09:54Z Mass loss from the Antarctic Ice Sheet is found to significantly contribute to eustatic sea level rise, due to a dynamic response in the system. Pine Island Glacier, a fast flowing outlet glacier in the West Antarctic Ice Sheet, is located in the Amundsen Sea Embayment Area, where the present Antarctic mass loss is concentrated. The observed mass loss in the area coincides with acceleration and thinning of the glacier, accompanied by a retreat of the grounding line, which is the line of separation between grounded and floating ice. The bed beneath the glacier lies in large parts below sea level, with the bed sloping down away from the ocean. This setting makes the glacier especially vulnerable to increasing and possibly accelerating retreat. Remote sensing techniques allow only for the surface conditions of glacial systems to be nowadays monitored over reasonable temporal and spatial scales. The conditions at the base, however, are still widely unknown, due to their inaccessibility. This poses a challenge, as basal conditions are a very important component for understanding glacier dynamics. A key technique to bridge this challenge is given by numerical modelling. In glaciological studies flow models are developed, that can either be used to solve in a prognostic manner over long time scales, being based on approximations to the full system of equations, or to solve diagnostically in high resolution for the full system, to study processes in more detail. Here we present a model of the later category, a thermo-mechanically coupled 3D full-Stokes ice flow model, which is set up to the region of Pine Island Glacier. It is solved with the finite element method, and the prismatic mesh is refined horizontally across the grounding line, where high resolution is needed. With this coupled flow model we assess the present thermal and dynamical state of the coupled ice sheet - ice shelf system. Furthermore, we develop a method to include measured basal properties into the formulation of the basal sliding law. We find the ... Doctoral or Postdoctoral Thesis Amundsen Sea Antarc* Antarctic Antarctica Antarktis* Eisschild* Ice Sheet Ice Shelf Pine Island Pine Island Glacier ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky) Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
ediss.sub.hamburg (Staats- und Universitätsbibliothek Hamburg, Carl von Ossietzky) |
op_collection_id |
ftsubhamburg |
language |
English |
topic |
Pine Island Gletscher Westantarktisches Eisschild Marines Eisschild full-Stokes Model Basales Gleiten Glaciology Antarctica Ice dynamics Modelling Pine Island Glacier 550 Geowissenschaften 30.03 Methoden und Techniken in den Naturwissenschaften 31.76 Numerische Mathematik 31.80 Angewandte Mathematik 33.14 Kontinuumsphysik 38.43 Gletscherkunde Glaziologie Modellierung Antarktis Gletscher Eis Strömungsmechanik Finite-Elemente-Methode Kontinuumsmechanik ddc:550 |
spellingShingle |
Pine Island Gletscher Westantarktisches Eisschild Marines Eisschild full-Stokes Model Basales Gleiten Glaciology Antarctica Ice dynamics Modelling Pine Island Glacier 550 Geowissenschaften 30.03 Methoden und Techniken in den Naturwissenschaften 31.76 Numerische Mathematik 31.80 Angewandte Mathematik 33.14 Kontinuumsphysik 38.43 Gletscherkunde Glaziologie Modellierung Antarktis Gletscher Eis Strömungsmechanik Finite-Elemente-Methode Kontinuumsmechanik ddc:550 Wilkens, Nina Pine Island Glacier : a 3D full-Stokes model study |
topic_facet |
Pine Island Gletscher Westantarktisches Eisschild Marines Eisschild full-Stokes Model Basales Gleiten Glaciology Antarctica Ice dynamics Modelling Pine Island Glacier 550 Geowissenschaften 30.03 Methoden und Techniken in den Naturwissenschaften 31.76 Numerische Mathematik 31.80 Angewandte Mathematik 33.14 Kontinuumsphysik 38.43 Gletscherkunde Glaziologie Modellierung Antarktis Gletscher Eis Strömungsmechanik Finite-Elemente-Methode Kontinuumsmechanik ddc:550 |
description |
Mass loss from the Antarctic Ice Sheet is found to significantly contribute to eustatic sea level rise, due to a dynamic response in the system. Pine Island Glacier, a fast flowing outlet glacier in the West Antarctic Ice Sheet, is located in the Amundsen Sea Embayment Area, where the present Antarctic mass loss is concentrated. The observed mass loss in the area coincides with acceleration and thinning of the glacier, accompanied by a retreat of the grounding line, which is the line of separation between grounded and floating ice. The bed beneath the glacier lies in large parts below sea level, with the bed sloping down away from the ocean. This setting makes the glacier especially vulnerable to increasing and possibly accelerating retreat. Remote sensing techniques allow only for the surface conditions of glacial systems to be nowadays monitored over reasonable temporal and spatial scales. The conditions at the base, however, are still widely unknown, due to their inaccessibility. This poses a challenge, as basal conditions are a very important component for understanding glacier dynamics. A key technique to bridge this challenge is given by numerical modelling. In glaciological studies flow models are developed, that can either be used to solve in a prognostic manner over long time scales, being based on approximations to the full system of equations, or to solve diagnostically in high resolution for the full system, to study processes in more detail. Here we present a model of the later category, a thermo-mechanically coupled 3D full-Stokes ice flow model, which is set up to the region of Pine Island Glacier. It is solved with the finite element method, and the prismatic mesh is refined horizontally across the grounding line, where high resolution is needed. With this coupled flow model we assess the present thermal and dynamical state of the coupled ice sheet - ice shelf system. Furthermore, we develop a method to include measured basal properties into the formulation of the basal sliding law. We find the ... |
author2 |
Humbert, Angelika (Prof. Dr.) |
format |
Doctoral or Postdoctoral Thesis |
author |
Wilkens, Nina |
author_facet |
Wilkens, Nina |
author_sort |
Wilkens, Nina |
title |
Pine Island Glacier : a 3D full-Stokes model study |
title_short |
Pine Island Glacier : a 3D full-Stokes model study |
title_full |
Pine Island Glacier : a 3D full-Stokes model study |
title_fullStr |
Pine Island Glacier : a 3D full-Stokes model study |
title_full_unstemmed |
Pine Island Glacier : a 3D full-Stokes model study |
title_sort |
pine island glacier : a 3d full-stokes model study |
publisher |
Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky |
publishDate |
2014 |
url |
http://nbn-resolving.de/urn:nbn:de:gbv:18-67350 https://ediss.sub.uni-hamburg.de/handle/ediss/5397 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Pine Island Glacier |
geographic_facet |
Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Pine Island Glacier |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Antarktis* Eisschild* Ice Sheet Ice Shelf Pine Island Pine Island Glacier |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Antarktis* Eisschild* Ice Sheet Ice Shelf Pine Island Pine Island Glacier |
op_relation |
http://nbn-resolving.de/urn:nbn:de:gbv:18-67350 https://ediss.sub.uni-hamburg.de/handle/ediss/5397 |
op_rights |
http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess No license |
_version_ |
1766378734774910976 |