Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C
Ice-crystal fabric can induce mechanical anisotropy that significantly affects flow, but ice-flow models generally do not include fabric development or its effect upon flow. Here, we incorporate a new spectral expansion of fabric, and more complete description of its evolution, into the ice-flow mod...
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Online Access: | https://doi.org/10.1017/jog.2023.78 https://doaj.org/article/4f5e29f2070b4296988606c2ae08e9fa |
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ftdoajarticles:oai:doaj.org/article:4f5e29f2070b4296988606c2ae08e9fa 2023-12-10T09:43:02+01:00 Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C David A. Lilien Nicholas M. Rathmann Christine S. Hvidberg Aslak Grinsted M. Reza Ershadi Reinhard Drews Dorthe Dahl-Jensen https://doi.org/10.1017/jog.2023.78 https://doaj.org/article/4f5e29f2070b4296988606c2ae08e9fa EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143023000783/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.78 0022-1430 1727-5652 https://doaj.org/article/4f5e29f2070b4296988606c2ae08e9fa Journal of Glaciology, Pp 1-20 Anisotropic ice flow ice-sheet modeling recrystallization Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article ftdoajarticles https://doi.org/10.1017/jog.2023.78 2023-11-12T01:39:40Z Ice-crystal fabric can induce mechanical anisotropy that significantly affects flow, but ice-flow models generally do not include fabric development or its effect upon flow. Here, we incorporate a new spectral expansion of fabric, and more complete description of its evolution, into the ice-flow model Elmer/Ice. This approach allows us to model the effect of both lattice rotation and migration recrystallization on large-scale ice flow. The fabric evolution is coupled to flow using an unapproximated non-linear orthotropic rheology that better describes deformation when the stress and fabric states are misaligned. These improvements are most relevant for simulating dynamically interesting areas, where recrystallization can be important, tuning data are scarce and rapid flow can lead to misalignment between stress and fabric. We validate the model by comparing simulated fabric to ice-core and phase-sensitive radar measurements on a transect across Dome C, East Antarctica. With appropriately tuned rates for recrystallization, the model is able to reproduce observations of fabric. However, these tuned rates differ from those previously derived from laboratory experiments, suggesting a need to better understand how recrystallization acts differently in the laboratory compared to natural settings. Article in Journal/Newspaper Antarc* Antarctica East Antarctica ice core Ice Sheet Journal of Glaciology Directory of Open Access Journals: DOAJ Articles East Antarctica Journal of Glaciology 1 20 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Anisotropic ice flow ice-sheet modeling recrystallization Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Anisotropic ice flow ice-sheet modeling recrystallization Environmental sciences GE1-350 Meteorology. Climatology QC851-999 David A. Lilien Nicholas M. Rathmann Christine S. Hvidberg Aslak Grinsted M. Reza Ershadi Reinhard Drews Dorthe Dahl-Jensen Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C |
topic_facet |
Anisotropic ice flow ice-sheet modeling recrystallization Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Ice-crystal fabric can induce mechanical anisotropy that significantly affects flow, but ice-flow models generally do not include fabric development or its effect upon flow. Here, we incorporate a new spectral expansion of fabric, and more complete description of its evolution, into the ice-flow model Elmer/Ice. This approach allows us to model the effect of both lattice rotation and migration recrystallization on large-scale ice flow. The fabric evolution is coupled to flow using an unapproximated non-linear orthotropic rheology that better describes deformation when the stress and fabric states are misaligned. These improvements are most relevant for simulating dynamically interesting areas, where recrystallization can be important, tuning data are scarce and rapid flow can lead to misalignment between stress and fabric. We validate the model by comparing simulated fabric to ice-core and phase-sensitive radar measurements on a transect across Dome C, East Antarctica. With appropriately tuned rates for recrystallization, the model is able to reproduce observations of fabric. However, these tuned rates differ from those previously derived from laboratory experiments, suggesting a need to better understand how recrystallization acts differently in the laboratory compared to natural settings. |
format |
Article in Journal/Newspaper |
author |
David A. Lilien Nicholas M. Rathmann Christine S. Hvidberg Aslak Grinsted M. Reza Ershadi Reinhard Drews Dorthe Dahl-Jensen |
author_facet |
David A. Lilien Nicholas M. Rathmann Christine S. Hvidberg Aslak Grinsted M. Reza Ershadi Reinhard Drews Dorthe Dahl-Jensen |
author_sort |
David A. Lilien |
title |
Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C |
title_short |
Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C |
title_full |
Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C |
title_fullStr |
Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C |
title_full_unstemmed |
Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C |
title_sort |
simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to dome c |
publisher |
Cambridge University Press |
url |
https://doi.org/10.1017/jog.2023.78 https://doaj.org/article/4f5e29f2070b4296988606c2ae08e9fa |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica ice core Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctica East Antarctica ice core Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, Pp 1-20 |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143023000783/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.78 0022-1430 1727-5652 https://doaj.org/article/4f5e29f2070b4296988606c2ae08e9fa |
op_doi |
https://doi.org/10.1017/jog.2023.78 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
20 |
_version_ |
1784886155283529728 |