Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream.
Funder: Canada Excellence Research Chairs, Government of Canada (Canada Excellence Research Chairs Program); doi: https://doi.org/10.13039/501100002784 Funder: Deutscher Akademischer Austauschdienst (German Academic Exchange Service); doi: https://doi.org/10.13039/501100001655 The dynamic mass loss...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/349708 2024-02-04T10:00:47+01:00 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 2023-05-11T18:16:19Z application/pdf text/xml https://www.repository.cam.ac.uk/handle/1810/349708 en eng eng Springer Science and Business Media LLC http://dx.doi.org/10.1038/s41467-023-38139-8 Nat Commun https://www.repository.cam.ac.uk/handle/1810/349708 37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology Article 2023 ftunivcam 2024-01-11T23:20:12Z Funder: Canada Excellence Research Chairs, Government of Canada (Canada Excellence Research Chairs Program); doi: https://doi.org/10.13039/501100002784 Funder: Deutscher Akademischer Austauschdienst (German Academic Exchange Service); doi: https://doi.org/10.13039/501100001655 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 Apollo - University of Cambridge Repository Canada Greenland |
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Open Polar |
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Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology |
spellingShingle |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 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. |
topic_facet |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology |
description |
Funder: Canada Excellence Research Chairs, Government of Canada (Canada Excellence Research Chairs Program); doi: https://doi.org/10.13039/501100002784 Funder: Deutscher Akademischer Austauschdienst (German Academic Exchange Service); doi: https://doi.org/10.13039/501100001655 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 |
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. |
publisher |
Springer Science and Business Media LLC |
publishDate |
2023 |
url |
https://www.repository.cam.ac.uk/handle/1810/349708 |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/349708 |
_version_ |
1789966251677712384 |