Articles | Volume 13, issue 1
https://doi.org/10.5194/tc-13-351-2019
© Author(s) 2019. 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-13-351-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
01 Feb 2019
Research article |
| 01 Feb 2019
| 01 Feb 2019
Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, USA
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
David J. Prior
Department of Geology, University of Otago, Dunedin, New Zealand
Lisa Craw
Department of Geology, University of Otago, Dunedin, New Zealand
Sheng Fan
Department of Geology, University of Otago, Dunedin, New Zealand
Maria-Gema Llorens
Departament de Geologia, Universitat Autónoma de Barcelona,
Barcelona, Spain
Albert Griera
Departament de Geologia, Universitat Autónoma de Barcelona,
Barcelona, Spain
Marianne Negrini
Department of Geology, University of Otago, Dunedin, New Zealand
Paul D. Bons
Department of Geosciences, Eberhard Karls University of Tübingen, Tübingen, Germany
David L. Goldsby
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, USA
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Ice crystal alignment in the sheared margins of fast-flowing polar ice is important as it may control the ice sheet flow rate, from land to the ocean. Sampling shear margins is difficult because of logistical and safety considerations. We show that crystal alignments in a glacier shear margin in Antarctica can be measured using sound waves. Results from a seismic experiment on the 50 m scale and from ultrasonic experiments on the decimetre scale match ice crystal measurements from an ice core.
Yu Wang, Chen Zhao, Rupert Gladstone, Ben Galton-Fenzi, and Roland Warner
The Cryosphere, 16, 1221–1245, https://doi.org/10.5194/tc-16-1221-2022, https://doi.org/10.5194/tc-16-1221-2022, 2022
Short summary
Short summary
The thermal structure of the Amery Ice Shelf and its spatial pattern are evaluated and analysed through temperature observations from six boreholes and numerical simulations. The simulations demonstrate significant ice warming downstream along the ice flow and a great variation of the thermal structure across the ice flow. We suggest that the thermal structure of the Amery Ice Shelf is unlikely to be affected by current climate changes on decadal timescales.
Alexander Meyer, Dmitry Eliseev, Dirk Heinen, Peter Linder, Franziska Scholz, Lars Steffen Weinstock, Christopher Wiebusch, and Simon Zierke
The Cryosphere, 13, 1381–1394, https://doi.org/10.5194/tc-13-1381-2019, https://doi.org/10.5194/tc-13-1381-2019, 2019
Short summary
Short summary
The acoustic damping in natural glaciers is a largely unexplored physical property that has relevance for various applications particularly for the exploration of glaciers with probes. We present measurements of the attenuation of sound in situ on the Italian glacier Langenferner. The tested frequency ranges from 2 to 35 kHz. The attenuation length ranges between 13 m for low frequencies and 5 m for high frequencies.
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Short summary
Ice deformed in nature develops crystallographic preferred orientations, CPOs, which induce an anisotropy in ice viscosity. Shear experiments of ice revealed a transition in CPO with changing temperature/strain, which is due to the change of dominant CPO-formation mechanism: strain-induced grain boundary migration dominates at higher temperatures and lower strains, while lattice rotation dominates at other conditions. Understanding these mechanisms aids the interpretation of CPOs in natural ice.
Ice deformed in nature develops crystallographic preferred orientations, CPOs, which induce an...
