Articles | Volume 14, issue 11
https://doi.org/10.5194/tc-14-3875-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-14-3875-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Nov 2020
Research article |
| 10 Nov 2020
| 10 Nov 2020
Temperature and strain controls on ice deformation mechanisms: insights from the microstructures of samples deformed to progressively higher strains at −10, −20 and −30 °C
Department of Geology, University of Otago, Dunedin, New Zealand
Travis F. Hager
Department of Earth and Environmental Science, University of
Pennsylvania, Philadelphia, PA, USA
David J. Prior
Department of Geology, University of Otago, Dunedin, New Zealand
Andrew J. Cross
Department of Earth and Environmental Science, University of
Pennsylvania, Philadelphia, PA, USA
Department of Geology and Geophysics, Woods Hole Oceanographic
Institution, Woods Hole, MA, USA
David L. Goldsby
Department of Earth and Environmental Science, University of
Pennsylvania, Philadelphia, PA, USA
Key laboratory of Earth and Planetary Physics, Institute of Geology
and Geophysics, Chinese Academy of Sciences, Beijing, China
Marianne Negrini
Department of Geology, University of Otago, Dunedin, New Zealand
John Wheeler
Department of Earth and Ocean Sciences, University of Liverpool,
Liverpool, UK
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Discipline: Ice sheets | Subject: Rheology
Grain growth of ice doped with soluble impurities
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Short summary
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Grain size is a key microphysical property of ice, controlling the rheological behavior of ice sheets and glaciers. In this study, we develop a new model for grain size evolution in ice and show that it accurately predicts grain size in laboratory experiments and in natural ice core data. The model provides a physical explanation for the power-law relationship between stress and strain rate known as the Glen law and can be used as a predictive tool for modeling ice flow in natural systems.
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Short summary
We performed uniaxial compression experiments on synthetic ice samples. We report ice microstructural evolution at –20 and –30 °C that has never been reported before. Microstructural data show the opening angle of c-axis cones decreases with increasing strain or with decreasing temperature, suggesting a more active grain rotation. CPO intensity weakens with temperature because CPO of small grains is weaker, and it can be explained by grain boundary sliding or nucleation with random orientations.
We performed uniaxial compression experiments on synthetic ice samples. We report ice...
