The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams
Streaming ice accounts for a major fraction of global ice flux, yet we cannot yet fully explain the dominant controls on its kinematics. In this contribution, we use an anisotropic full-Stokes thermomechanical flow solver to characterize how mechanical anisotropy and temperature distribution affect...
Published in: | Journal of Glaciology |
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Cambridge University Press
2020
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Online Access: | http://nora.nerc.ac.uk/id/eprint/528331/ https://nora.nerc.ac.uk/id/eprint/528331/1/impact_of_temperature_and_crystal_orientation_fabric_on_the_dynamics_of_mountain_glaciers_and_ice_streams.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/impact-of-temperature-and-crystal-orientation-fabric-on-the-dynamics-of-mountain-glaciers-and-ice-streams/538918B695F492BE8FB8A836A3AF2AC8 |
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ftnerc:oai:nora.nerc.ac.uk:528331 2023-05-15T16:57:39+02:00 The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams Hruby, Kate Gerbi, Christopher Koons, Peter Campbell, Seth Martín, Carlos Hawley, Robert 2020-10 text http://nora.nerc.ac.uk/id/eprint/528331/ https://nora.nerc.ac.uk/id/eprint/528331/1/impact_of_temperature_and_crystal_orientation_fabric_on_the_dynamics_of_mountain_glaciers_and_ice_streams.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/impact-of-temperature-and-crystal-orientation-fabric-on-the-dynamics-of-mountain-glaciers-and-ice-streams/538918B695F492BE8FB8A836A3AF2AC8 en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/528331/1/impact_of_temperature_and_crystal_orientation_fabric_on_the_dynamics_of_mountain_glaciers_and_ice_streams.pdf Hruby, Kate; Gerbi, Christopher; Koons, Peter; Campbell, Seth; Martín, Carlos orcid:0000-0002-2661-169X Hawley, Robert. 2020 The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams. Journal of Glaciology, 66 (259). 755-765. https://doi.org/10.1017/jog.2020.44 <https://doi.org/10.1017/jog.2020.44> cc_by_4 CC-BY Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1017/jog.2020.44 2023-02-04T19:50:59Z Streaming ice accounts for a major fraction of global ice flux, yet we cannot yet fully explain the dominant controls on its kinematics. In this contribution, we use an anisotropic full-Stokes thermomechanical flow solver to characterize how mechanical anisotropy and temperature distribution affect ice flux. For the ice stream and glacier geometries we explored, we found that the ice flux increases 1–3% per °C temperature increase in the margin. Glaciers and ice streams with crystallographic fabric oriented approximately normal to the shear plane increase by comparable amounts: an otherwise isotropic ice stream containing a concentrated transverse single maximum fabric in the margin flows 15% faster than the reference case. Fabric and temperature variations independently impact ice flux, with slightly nonlinear interactions. We find that realistic variations in temperature and crystallographic fabric both affect ice flux to similar degrees, with the exact effect a function of the local fabric and temperature distributions. Given this sensitivity, direct field-based measurements and models incorporating additional factors, such as water content and temporal evolution, are essential for explaining and predicting streaming ice dynamics. Article in Journal/Newspaper Journal of Glaciology Natural Environment Research Council: NERC Open Research Archive Journal of Glaciology 66 259 755 765 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Streaming ice accounts for a major fraction of global ice flux, yet we cannot yet fully explain the dominant controls on its kinematics. In this contribution, we use an anisotropic full-Stokes thermomechanical flow solver to characterize how mechanical anisotropy and temperature distribution affect ice flux. For the ice stream and glacier geometries we explored, we found that the ice flux increases 1–3% per °C temperature increase in the margin. Glaciers and ice streams with crystallographic fabric oriented approximately normal to the shear plane increase by comparable amounts: an otherwise isotropic ice stream containing a concentrated transverse single maximum fabric in the margin flows 15% faster than the reference case. Fabric and temperature variations independently impact ice flux, with slightly nonlinear interactions. We find that realistic variations in temperature and crystallographic fabric both affect ice flux to similar degrees, with the exact effect a function of the local fabric and temperature distributions. Given this sensitivity, direct field-based measurements and models incorporating additional factors, such as water content and temporal evolution, are essential for explaining and predicting streaming ice dynamics. |
format |
Article in Journal/Newspaper |
author |
Hruby, Kate Gerbi, Christopher Koons, Peter Campbell, Seth Martín, Carlos Hawley, Robert |
spellingShingle |
Hruby, Kate Gerbi, Christopher Koons, Peter Campbell, Seth Martín, Carlos Hawley, Robert The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams |
author_facet |
Hruby, Kate Gerbi, Christopher Koons, Peter Campbell, Seth Martín, Carlos Hawley, Robert |
author_sort |
Hruby, Kate |
title |
The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams |
title_short |
The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams |
title_full |
The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams |
title_fullStr |
The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams |
title_full_unstemmed |
The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams |
title_sort |
impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/528331/ https://nora.nerc.ac.uk/id/eprint/528331/1/impact_of_temperature_and_crystal_orientation_fabric_on_the_dynamics_of_mountain_glaciers_and_ice_streams.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/impact-of-temperature-and-crystal-orientation-fabric-on-the-dynamics-of-mountain-glaciers-and-ice-streams/538918B695F492BE8FB8A836A3AF2AC8 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_relation |
https://nora.nerc.ac.uk/id/eprint/528331/1/impact_of_temperature_and_crystal_orientation_fabric_on_the_dynamics_of_mountain_glaciers_and_ice_streams.pdf Hruby, Kate; Gerbi, Christopher; Koons, Peter; Campbell, Seth; Martín, Carlos orcid:0000-0002-2661-169X Hawley, Robert. 2020 The impact of temperature and crystal orientation fabric on the dynamics of mountain glaciers and ice streams. Journal of Glaciology, 66 (259). 755-765. https://doi.org/10.1017/jog.2020.44 <https://doi.org/10.1017/jog.2020.44> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2020.44 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
259 |
container_start_page |
755 |
op_container_end_page |
765 |
_version_ |
1766049209435291648 |