The Cryosphere
The Cryosphere
TC
Articles | Volume 14, issue 7
Articles | Volume 14, issue 7
https://doi.org/10.5194/tc-14-2449-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-14-2449-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 14, issue 7
Research article
 | 
27 Jul 2020
Research article |  | 27 Jul 2020

Using a composite flow law to model deformation in the NEEM deep ice core, Greenland – Part 2: The role of grain size and premelting on ice deformation at high homologous temperature

Ernst-Jan N. Kuiper, Johannes H. P. de Bresser, Martyn R. Drury, Jan Eichler, Gill M. Pennock, and Ilka Weikusat

Data sets

C-axis fabric analysis of ice samples collected from the NEEM ice core J. Eichler, I. Weikusat, and S. Kipfstuhl https://doi.org/10.1594/PANGAEA.838063

Large area scan macroscope images from the NEEM ice core S. Kipfstuhl https://doi.pangaea.de/10.1594/PANGAEA.743296

Crystal c-axes (fabric) of ice core samples collected from the NEEM ice core I. Weikusat and S. Kipfstuhl https://doi.pangaea.de/10.1594/PANGAEA.744004

Structural grain parameters from image analysis of large area scan macroscope images from the NEEM ice core Ilka Weikusat, Tobias Binder, and Sepp Kipfstuhl https://doi.org/10.1594/PANGAEA.743296

A composite flow law to model deformation in the NEEM deep ice core, Greenland - The role of grain size, grain size distribution and premelting on ice deformation Ilka Weikusat, Ernst-Jan N. Kuiper, Johannes H. P. de Bresser, Daniela Jansen, Gillian M. Pennock, and Martyn R. Drury https://doi.org/10.1594/PANGAEA.920005

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Short summary
Fast ice flow occurs in deeper parts of polar ice sheets, driven by high stress and high temperatures. Above 262 K ice flow is further enhanced, probably by the formation of thin melt layers between ice crystals. A model applying an experimentally derived composite flow law, using temperature and grain size values from the deepest 540 m of the NEEM ice core, predicts that flow in fine-grained layers is enhanced by a factor of 10 compared to coarse-grained layers in the Greenland ice sheet.
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