Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
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.
I: Nature Communications, Bind 14, Nr. 1, 2653, 08.05.2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Crystal orientation fabric anisotropy causes directional hardening of the Northeast Greenland Ice Stream
AU - Gerber, Tamara Annina
AU - Lilien, David A.
AU - Rathmann, Nicholas Mossor
AU - Franke, Steven
AU - Young, Tun Jan
AU - Valero-Delgado, Fernando
AU - Ershadi, M. Reza
AU - Drews, Reinhard
AU - Zeising, Ole
AU - Humbert, Angelika
AU - Stoll, Nicolas
AU - Weikusat, Ilka
AU - Grinsted, Aslak
AU - Hvidberg, Christine Schøtt
AU - Jansen, Daniela
AU - Miller, Heinrich
AU - Helm, Veit
AU - Steinhage, Daniel
AU - O’Neill, Charles
AU - Paden, John
AU - Gogineni, Siva Prasad
AU - Dahl-Jensen, Dorthe
AU - Eisen, Olaf
N1 - Publisher Copyright: © 2023, The Author(s).
PY - 2023/5/8
Y1 - 2023/5/8
N2 - 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.
AB - 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.
U2 - 10.1038/s41467-023-38139-8
DO - 10.1038/s41467-023-38139-8
M3 - Journal article
C2 - 37156772
AN - SCOPUS:85158119718
VL - 14
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 2653
ER -
ID: 356894416