Effective rheology across the fragmentation transition for sea ice and ice shelves
Funding was provided by the NERC grant NE/P011365/1 Calving Laws for Ice Sheet Models CALISMO. Data files for the plots are found at: https://doi.org/10.5285/76D7D3CA-7B83-4BB0-AAE5-A8E92C7DA5B0 Sea ice and ice shelves can be described by a viscoelastic rheology that is approximately linear elastic...
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Online Access: | http://hdl.handle.net/10023/19967 https://doi.org/10.1029/2019GL084896 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/19967 2023-07-02T03:30:36+02:00 Effective rheology across the fragmentation transition for sea ice and ice shelves Åström, J.A. Benn, D.I. NERC University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute 2020-05-20 application/pdf http://hdl.handle.net/10023/19967 https://doi.org/10.1029/2019GL084896 eng eng Geophysical Research Letters Åström , J A & Benn , D I 2019 , ' Effective rheology across the fragmentation transition for sea ice and ice shelves ' , Geophysical Research Letters , vol. Early View . https://doi.org/10.1029/2019GL084896 0094-8276 PURE: 262777732 PURE UUID: f7894529-fbcf-4e25-838f-eca7daf618f3 RIS: urn:D1C2EBA06DF1EDF4FD2DD00E9E2ECEDC ORCID: /0000-0002-3604-0886/work/65013950 Scopus: 85075369664 WOS: 000497261400001 http://hdl.handle.net/10023/19967 https://doi.org/10.1029/2019GL084896 NE-P011365/1 Copyright © 2019. American Geophysical Union. All Rights Reserved. . This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2019GL084896 Ice shelves Sea ice Modelling G Geography (General) DAS SDG 13 - Climate Action G1 Journal article 2020 ftstandrewserep https://doi.org/10.1029/2019GL084896 2023-06-13T18:25:12Z Funding was provided by the NERC grant NE/P011365/1 Calving Laws for Ice Sheet Models CALISMO. Data files for the plots are found at: https://doi.org/10.5285/76D7D3CA-7B83-4BB0-AAE5-A8E92C7DA5B0 Sea ice and ice shelves can be described by a viscoelastic rheology that is approximately linear elastic and brittle at high strain rates, and viscously shear‐thinning at low strain rates. Brittle ice easily fractures under compressive shear and forms shear bands as the material undergoes a transition to a fragmented, granular state. This transition plays a central role in the mechanical behaviour at large scales of sea‐ice in the Arctic Ocean or Antarctic ice shelves. Here we demonstrate that the fragmentation transition is characterized by an essentially discontinuous drop of 3‐5 orders of magnitude in effective viscosity and stress‐relaxation time. Beyond the fragmentation transition, grinding in shear zones further reduces both effective viscosity and shear stiffness, but with an essentially constant relaxation time of ∼10second. These results are relevant for ice‐rheology implementation in large‐scale climate‐related models of sea ice and thin ice shelves. Publisher PDF Peer reviewed Article in Journal/Newspaper Antarc* Antarctic Arctic Arctic Ocean Ice Sheet Ice Shelves Sea ice University of St Andrews: Digital Research Repository Antarctic Arctic Arctic Ocean Geophysical Research Letters 46 22 13099 13106 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Ice shelves Sea ice Modelling G Geography (General) DAS SDG 13 - Climate Action G1 |
spellingShingle |
Ice shelves Sea ice Modelling G Geography (General) DAS SDG 13 - Climate Action G1 Åström, J.A. Benn, D.I. Effective rheology across the fragmentation transition for sea ice and ice shelves |
topic_facet |
Ice shelves Sea ice Modelling G Geography (General) DAS SDG 13 - Climate Action G1 |
description |
Funding was provided by the NERC grant NE/P011365/1 Calving Laws for Ice Sheet Models CALISMO. Data files for the plots are found at: https://doi.org/10.5285/76D7D3CA-7B83-4BB0-AAE5-A8E92C7DA5B0 Sea ice and ice shelves can be described by a viscoelastic rheology that is approximately linear elastic and brittle at high strain rates, and viscously shear‐thinning at low strain rates. Brittle ice easily fractures under compressive shear and forms shear bands as the material undergoes a transition to a fragmented, granular state. This transition plays a central role in the mechanical behaviour at large scales of sea‐ice in the Arctic Ocean or Antarctic ice shelves. Here we demonstrate that the fragmentation transition is characterized by an essentially discontinuous drop of 3‐5 orders of magnitude in effective viscosity and stress‐relaxation time. Beyond the fragmentation transition, grinding in shear zones further reduces both effective viscosity and shear stiffness, but with an essentially constant relaxation time of ∼10second. These results are relevant for ice‐rheology implementation in large‐scale climate‐related models of sea ice and thin ice shelves. Publisher PDF Peer reviewed |
author2 |
NERC University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute |
format |
Article in Journal/Newspaper |
author |
Åström, J.A. Benn, D.I. |
author_facet |
Åström, J.A. Benn, D.I. |
author_sort |
Åström, J.A. |
title |
Effective rheology across the fragmentation transition for sea ice and ice shelves |
title_short |
Effective rheology across the fragmentation transition for sea ice and ice shelves |
title_full |
Effective rheology across the fragmentation transition for sea ice and ice shelves |
title_fullStr |
Effective rheology across the fragmentation transition for sea ice and ice shelves |
title_full_unstemmed |
Effective rheology across the fragmentation transition for sea ice and ice shelves |
title_sort |
effective rheology across the fragmentation transition for sea ice and ice shelves |
publishDate |
2020 |
url |
http://hdl.handle.net/10023/19967 https://doi.org/10.1029/2019GL084896 |
geographic |
Antarctic Arctic Arctic Ocean |
geographic_facet |
Antarctic Arctic Arctic Ocean |
genre |
Antarc* Antarctic Arctic Arctic Ocean Ice Sheet Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Arctic Arctic Ocean Ice Sheet Ice Shelves Sea ice |
op_relation |
Geophysical Research Letters Åström , J A & Benn , D I 2019 , ' Effective rheology across the fragmentation transition for sea ice and ice shelves ' , Geophysical Research Letters , vol. Early View . https://doi.org/10.1029/2019GL084896 0094-8276 PURE: 262777732 PURE UUID: f7894529-fbcf-4e25-838f-eca7daf618f3 RIS: urn:D1C2EBA06DF1EDF4FD2DD00E9E2ECEDC ORCID: /0000-0002-3604-0886/work/65013950 Scopus: 85075369664 WOS: 000497261400001 http://hdl.handle.net/10023/19967 https://doi.org/10.1029/2019GL084896 NE-P011365/1 |
op_rights |
Copyright © 2019. American Geophysical Union. All Rights Reserved. . This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2019GL084896 |
op_doi |
https://doi.org/10.1029/2019GL084896 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
22 |
container_start_page |
13099 |
op_container_end_page |
13106 |
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1770274807833690112 |