Ice viscosity is more sensitive to stress than commonly assumed
© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Millstein, J. D., Minchew, B. M., & Pegler, S. S. Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & En...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/29119 2023-05-15T13:48:31+02:00 Ice viscosity is more sensitive to stress than commonly assumed Millstein, Joanna D. Minchew, Brent M. Pegler, Samuel S. 2022-03-10 https://hdl.handle.net/1912/29119 unknown Nature Research https://doi.org/10.1038/s43247-022-00385-x Millstein, J. D., Minchew, B. M., & Pegler, S. S. (2022). Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & Environment, 3(1), 57. https://hdl.handle.net/1912/29119 doi:10.1038/s43247-022-00385-x Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ CC-BY Millstein, J. D., Minchew, B. M., & Pegler, S. S. (2022). Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & Environment, 3(1), 57. doi:10.1038/s43247-022-00385-x Article 2022 ftwhoas https://doi.org/10.1038/s43247-022-00385-x 2022-07-30T22:56:44Z © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Millstein, J. D., Minchew, B. M., & Pegler, S. S. Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & Environment, 3(1), (2022): 57, https://doi.org/10.1038/s43247-022-00385-x. Accurate representation of the viscous flow of ice is fundamental to understanding glacier dynamics and projecting sea-level rise. Ice viscosity is often described by a simple but largely untested and uncalibrated constitutive relation, Glen’s Flow Law, wherein the rate of deformation is proportional to stress raised to the power n. The value n = 3 is commonly prescribed in ice-flow models, though observations and experiments support a range of values across stresses and temperatures found on Earth. Here, we leverage recent remotely-sensed observations of Antarctic ice shelves to show that Glen’s Flow Law approximates the viscous flow of ice with n = 4.1 ± 0.4 in fast-flowing areas. The viscosity and flow rate of ice are therefore more sensitive to changes in stress than most ice-flow models allow. By calibrating the governing equation of ice deformation, our result is a pathway towards improving projections of future glacier change. .D.M. was partially funded through an NSF Graduate Research Fellowship. J.D.M. and B.M.M. where partially funded through NSF-NERC award 1853918. B.M.M. received additional funding through NSF-NERC award 1739031. Article in Journal/Newspaper Antarc* Antarctic Ice Shelves Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Communications Earth & Environment 3 1 |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Millstein, J. D., Minchew, B. M., & Pegler, S. S. Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & Environment, 3(1), (2022): 57, https://doi.org/10.1038/s43247-022-00385-x. Accurate representation of the viscous flow of ice is fundamental to understanding glacier dynamics and projecting sea-level rise. Ice viscosity is often described by a simple but largely untested and uncalibrated constitutive relation, Glen’s Flow Law, wherein the rate of deformation is proportional to stress raised to the power n. The value n = 3 is commonly prescribed in ice-flow models, though observations and experiments support a range of values across stresses and temperatures found on Earth. Here, we leverage recent remotely-sensed observations of Antarctic ice shelves to show that Glen’s Flow Law approximates the viscous flow of ice with n = 4.1 ± 0.4 in fast-flowing areas. The viscosity and flow rate of ice are therefore more sensitive to changes in stress than most ice-flow models allow. By calibrating the governing equation of ice deformation, our result is a pathway towards improving projections of future glacier change. .D.M. was partially funded through an NSF Graduate Research Fellowship. J.D.M. and B.M.M. where partially funded through NSF-NERC award 1853918. B.M.M. received additional funding through NSF-NERC award 1739031. |
format |
Article in Journal/Newspaper |
author |
Millstein, Joanna D. Minchew, Brent M. Pegler, Samuel S. |
spellingShingle |
Millstein, Joanna D. Minchew, Brent M. Pegler, Samuel S. Ice viscosity is more sensitive to stress than commonly assumed |
author_facet |
Millstein, Joanna D. Minchew, Brent M. Pegler, Samuel S. |
author_sort |
Millstein, Joanna D. |
title |
Ice viscosity is more sensitive to stress than commonly assumed |
title_short |
Ice viscosity is more sensitive to stress than commonly assumed |
title_full |
Ice viscosity is more sensitive to stress than commonly assumed |
title_fullStr |
Ice viscosity is more sensitive to stress than commonly assumed |
title_full_unstemmed |
Ice viscosity is more sensitive to stress than commonly assumed |
title_sort |
ice viscosity is more sensitive to stress than commonly assumed |
publisher |
Nature Research |
publishDate |
2022 |
url |
https://hdl.handle.net/1912/29119 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Shelves |
genre_facet |
Antarc* Antarctic Ice Shelves |
op_source |
Millstein, J. D., Minchew, B. M., & Pegler, S. S. (2022). Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & Environment, 3(1), 57. doi:10.1038/s43247-022-00385-x |
op_relation |
https://doi.org/10.1038/s43247-022-00385-x Millstein, J. D., Minchew, B. M., & Pegler, S. S. (2022). Ice viscosity is more sensitive to stress than commonly assumed. Communications Earth & Environment, 3(1), 57. https://hdl.handle.net/1912/29119 doi:10.1038/s43247-022-00385-x |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s43247-022-00385-x |
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Communications Earth & Environment |
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3 |
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1 |
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1766249377586741248 |