Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream
The dynamic mass loss of ice sheets constitutes one of the biggest uncertainties in projections of ice-sheet evolution. One central, understudied aspect of ice flow is how the bulk orientation of the crystal orientation fabric translates to the mechanical anisotropy of ice. Here we show the spatial...
Published in: | Nature Communications |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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Language: | English |
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2023
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/crystal-orientation-fabric-anisotropy-causes-directional-hardening-of-the-northeast-greenland-ice-stream(2d8621cc-ce5e-4ba9-862d-4b710254fa17).html https://doi.org/10.1038/s41467-023-38139-8 https://research-repository.st-andrews.ac.uk/bitstream/10023/27628/1/Gerber_2023_NC_Crystal_orientation_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/2d8621cc-ce5e-4ba9-862d-4b710254fa17 2024-09-15T18:09:14+00:00 Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream Gerber, Tamara Annina Lilien, David A Rathmann, Nicholas Mossor Franke, Steven Young, Tun Jan Valero-Delgado, Fernando Ershadi, M Reza Drews, Reinhard Zeising, Ole Humbert, Angelika Stoll, Nicolas Weikusat, Ilka Grinsted, Aslak Hvidberg, Christine Schøtt Jansen, Daniela Miller, Heinrich Helm, Veit Steinhage, Daniel O'Neill, Charles Paden, John Gogineni, Siva Prasad Dahl-Jensen, Dorthe Eisen, Olaf 2023-05-08 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/crystal-orientation-fabric-anisotropy-causes-directional-hardening-of-the-northeast-greenland-ice-stream(2d8621cc-ce5e-4ba9-862d-4b710254fa17).html https://doi.org/10.1038/s41467-023-38139-8 https://research-repository.st-andrews.ac.uk/bitstream/10023/27628/1/Gerber_2023_NC_Crystal_orientation_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/crystal-orientation-fabric-anisotropy-causes-directional-hardening-of-the-northeast-greenland-ice-stream(2d8621cc-ce5e-4ba9-862d-4b710254fa17).html info:eu-repo/semantics/openAccess Gerber , T A , Lilien , D A , Rathmann , N M , Franke , S , Young , T J , Valero-Delgado , F , Ershadi , M R , Drews , R , Zeising , O , Humbert , A , Stoll , N , Weikusat , I , Grinsted , A , Hvidberg , C S , Jansen , D , Miller , H , Helm , V , Steinhage , D , O'Neill , C , Paden , J , Gogineni , S P , Dahl-Jensen , D & Eisen , O 2023 , ' Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream ' , Nature Communications , vol. 14 , 2653 . https://doi.org/10.1038/s41467-023-38139-8 article 2023 ftunstandrewcris https://doi.org/10.1038/s41467-023-38139-8 2024-08-21T23:46:11Z The dynamic mass loss of ice sheets constitutes one of the biggest uncertainties in projections of ice-sheet evolution. One central, understudied aspect of ice flow is how the bulk orientation of the crystal orientation fabric translates to the mechanical anisotropy of ice. Here we show the spatial distribution of the depth-averaged horizontal anisotropy and corresponding directional flow-enhancement factors covering a large area of the Northeast Greenland Ice Stream onset. Our results are based on airborne and ground-based radar surveys, ice-core observations, and numerical ice-flow modelling. They show a strong spatial variability of the horizontal anisotropy and a rapid crystal reorganisation on the order of hundreds of years coinciding with the ice-stream geometry. Compared to isotropic ice, parts of the ice stream are found to be more than one order of magnitude harder for along-flow extension/compression while the shear margins are potentially softened by a factor of two for horizontal-shear deformation. Article in Journal/Newspaper Greenland ice core Ice Sheet University of St Andrews: Research Portal Nature Communications 14 1 |
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Open Polar |
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University of St Andrews: Research Portal |
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ftunstandrewcris |
language |
English |
description |
The dynamic mass loss of ice sheets constitutes one of the biggest uncertainties in projections of ice-sheet evolution. One central, understudied aspect of ice flow is how the bulk orientation of the crystal orientation fabric translates to the mechanical anisotropy of ice. Here we show the spatial distribution of the depth-averaged horizontal anisotropy and corresponding directional flow-enhancement factors covering a large area of the Northeast Greenland Ice Stream onset. Our results are based on airborne and ground-based radar surveys, ice-core observations, and numerical ice-flow modelling. They show a strong spatial variability of the horizontal anisotropy and a rapid crystal reorganisation on the order of hundreds of years coinciding with the ice-stream geometry. Compared to isotropic ice, parts of the ice stream are found to be more than one order of magnitude harder for along-flow extension/compression while the shear margins are potentially softened by a factor of two for horizontal-shear deformation. |
format |
Article in Journal/Newspaper |
author |
Gerber, Tamara Annina Lilien, David A Rathmann, Nicholas Mossor Franke, Steven Young, Tun Jan Valero-Delgado, Fernando Ershadi, M Reza Drews, Reinhard Zeising, Ole Humbert, Angelika Stoll, Nicolas Weikusat, Ilka Grinsted, Aslak Hvidberg, Christine Schøtt Jansen, Daniela Miller, Heinrich Helm, Veit Steinhage, Daniel O'Neill, Charles Paden, John Gogineni, Siva Prasad Dahl-Jensen, Dorthe Eisen, Olaf |
spellingShingle |
Gerber, Tamara Annina Lilien, David A Rathmann, Nicholas Mossor Franke, Steven Young, Tun Jan Valero-Delgado, Fernando Ershadi, M Reza Drews, Reinhard Zeising, Ole Humbert, Angelika Stoll, Nicolas Weikusat, Ilka Grinsted, Aslak Hvidberg, Christine Schøtt Jansen, Daniela Miller, Heinrich Helm, Veit Steinhage, Daniel O'Neill, Charles Paden, John Gogineni, Siva Prasad Dahl-Jensen, Dorthe Eisen, Olaf Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream |
author_facet |
Gerber, Tamara Annina Lilien, David A Rathmann, Nicholas Mossor Franke, Steven Young, Tun Jan Valero-Delgado, Fernando Ershadi, M Reza Drews, Reinhard Zeising, Ole Humbert, Angelika Stoll, Nicolas Weikusat, Ilka Grinsted, Aslak Hvidberg, Christine Schøtt Jansen, Daniela Miller, Heinrich Helm, Veit Steinhage, Daniel O'Neill, Charles Paden, John Gogineni, Siva Prasad Dahl-Jensen, Dorthe Eisen, Olaf |
author_sort |
Gerber, Tamara Annina |
title |
Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream |
title_short |
Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream |
title_full |
Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream |
title_fullStr |
Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream |
title_full_unstemmed |
Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream |
title_sort |
crystal orientation fabric anisotropy causes directional hardening of the northeast greenland ice stream |
publishDate |
2023 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/crystal-orientation-fabric-anisotropy-causes-directional-hardening-of-the-northeast-greenland-ice-stream(2d8621cc-ce5e-4ba9-862d-4b710254fa17).html https://doi.org/10.1038/s41467-023-38139-8 https://research-repository.st-andrews.ac.uk/bitstream/10023/27628/1/Gerber_2023_NC_Crystal_orientation_CC.pdf |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_source |
Gerber , T A , Lilien , D A , Rathmann , N M , Franke , S , Young , T J , Valero-Delgado , F , Ershadi , M R , Drews , R , Zeising , O , Humbert , A , Stoll , N , Weikusat , I , Grinsted , A , Hvidberg , C S , Jansen , D , Miller , H , Helm , V , Steinhage , D , O'Neill , C , Paden , J , Gogineni , S P , Dahl-Jensen , D & Eisen , O 2023 , ' Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream ' , Nature Communications , vol. 14 , 2653 . https://doi.org/10.1038/s41467-023-38139-8 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/crystal-orientation-fabric-anisotropy-causes-directional-hardening-of-the-northeast-greenland-ice-stream(2d8621cc-ce5e-4ba9-862d-4b710254fa17).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41467-023-38139-8 |
container_title |
Nature Communications |
container_volume |
14 |
container_issue |
1 |
_version_ |
1810446665361915904 |