Can changes in deformation regimes be inferred from crystallographic preferred orientations in polar ice?
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Published:2022-05-25
Issue:5
Volume:16
Page:2009-2024
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Llorens Maria-GemaORCID, Griera AlbertORCID, Bons Paul D.ORCID, Weikusat IlkaORCID, Prior David J.ORCID, Gomez-Rivas EnriqueORCID, de Riese Tamara, Jimenez-Munt Ivone, García-Castellanos Daniel, Lebensohn Ricardo A.
Abstract
Abstract. Creep due to ice flow is generally thought to be the main cause for the
formation of crystallographic preferred orientations (CPOs) in
polycrystalline anisotropic ice. However, linking the development of CPOs to
the ice flow history requires a proper understanding of the ice aggregate's
microstructural response to flow transitions. In this contribution the
influence of ice deformation history on the CPO development is investigated
by means of full-field numerical simulations at the microscale. We simulate
the CPO evolution of polycrystalline ice under combinations of two
consecutive deformation events up to high strain, using the code VPFFT (visco-plastic fast
Fourier transform algorithm) within ELLE.
A volume of ice is first deformed under coaxial boundary conditions, which
results in a CPO. The sample is then subjected to different boundary
conditions (coaxial or non-coaxial) in order to observe how the deformation
regime switch impacts the CPO. The model results indicate that the second
flow event tends to destroy the first, inherited fabric with a range of
transitional fabrics. However, the transition is slow when crystallographic
axes are critically oriented with respect to the second imposed regime.
Therefore, interpretations of past deformation events from observed CPOs
must be carried out with caution, particularly in areas with complex
deformation histories.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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