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Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream

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dc.contributor.authorGerber, Tamara Annina
dc.contributor.authorLilien, David A.
dc.contributor.authorRathmann, Nicholas Mossor
dc.contributor.authorFranke, Steven
dc.contributor.authorYoung, Tun Jan
dc.contributor.authorValero-Delgado, Fernando
dc.contributor.authorErshadi, M. Reza
dc.contributor.authorDrews, Reinhard
dc.contributor.authorZeising, Ole
dc.contributor.authorHumbert, Angelika
dc.contributor.authorStoll, Nicolas
dc.contributor.authorWeikusat, Ilka
dc.contributor.authorGrinsted, Aslak
dc.contributor.authorHvidberg, Christine Schott
dc.contributor.authorJansen, Daniela
dc.contributor.authorMiller, Heinrich
dc.contributor.authorHelm, Veit
dc.contributor.authorSteinhage, Daniel
dc.contributor.authorO'Neill, Charles
dc.contributor.authorPaden, John
dc.contributor.authorGogineni, Siva Prasad
dc.contributor.authorDahl-Jensen, Dorthe
dc.contributor.authorEisen, Olaf
dc.contributor.otherUniversity of Copenhagen
dc.contributor.otherNiels Bohr Institute
dc.contributor.otherUniversity of Manitoba
dc.contributor.otherHelmholtz Association
dc.contributor.otherAlfred Wegener Institute, Helmholtz Centre for Polar & Marine Research
dc.contributor.otherUniversity of Cambridge
dc.contributor.otherUniversity of St Andrews
dc.contributor.otherEberhard Karls University of Tubingen
dc.contributor.otherUniversity of Bremen
dc.contributor.otherUniversity of Kansas
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2023-09-28T19:34:32Z
dc.date.available2023-09-28T19:34:32Z
dc.date.issued2023
dc.description.abstractThis study uses radio-echo sounding measurements, ice-core data and models to map the spatial variation in ice-crystal orientation in the northeast Greenland Ice Stream and shows how it potentially affects the ice-flow dynamics in this region. 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.en_US
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.citationGerber, 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., … Eisen, O. (2023). Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream. In Nature Communications (Vol. 14, Issue 1). Springer Science and Business Media LLC. https://doi.org/10.1038/s41467-023-38139-8
dc.identifier.doi10.1038/s41467-023-38139-8
dc.identifier.orcidhttps://orcid.org/0000-0002-3219-8395
dc.identifier.orcidhttps://orcid.org/0000-0002-1474-1948
dc.identifier.orcidhttps://orcid.org/0000-0001-8667-8020
dc.identifier.orcidhttps://orcid.org/0000-0002-0368-7229
dc.identifier.orcidhttps://orcid.org/0000-0002-8929-1638
dc.identifier.orcidhttps://orcid.org/0000-0001-5865-3459
dc.identifier.orcidhttps://orcid.org/0000-0002-0244-8760
dc.identifier.orcidhttps://orcid.org/0000-0002-2328-294X
dc.identifier.orcidhttps://orcid.org/0000-0002-1284-8098
dc.identifier.orcidhttps://orcid.org/0000-0001-8462-4379
dc.identifier.urihttps://ir.ua.edu/handle/123456789/11468
dc.languageEnglish
dc.language.isoen_US
dc.publisherNature Portfolio
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectCOMPOSITE FLOW LAW
dc.subjectSHEET MODEL PISM
dc.subjectPART 1
dc.subjectFULL-STOKES
dc.subjectGRAIN-SIZE
dc.subjectPOLAR ICE
dc.subjectRADAR
dc.subjectCORE
dc.subjectDEFORMATION
dc.subjectMICROSTRUCTURE
dc.subjectMultidisciplinary Sciences
dc.titleCrystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Streamen_US
dc.typeArticle
dc.typetext

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