Preprints
https://doi.org/10.5194/tc-2021-118
https://doi.org/10.5194/tc-2021-118

  26 Apr 2021

26 Apr 2021

Review status: a revised version of this preprint is currently under review for the journal TC.

Ice fabrics in natural flows: beyond pure and simple shear

Daniel H. M. Richards1, Samuel S. Pegler2, and Sandra Piazolo3 Daniel H. M. Richards et al.
  • 1Fluid Dynamics CDT, University of Leeds, United Kingdom
  • 2School of Mathematics, University of Leeds, United Kingdom
  • 3School of Earth and Environment, University of Leeds, United Kingdom

Abstract. Ice fabrics are key for understanding and predicting ice flow dynamics. Despite its importance, the characteristics and evolution of ice fabrics beyond pure and simple shear flow has largely been neglected. However, 80 % of the flow of ice in Antarctica is outside the regimes of pure and simple shear. We use a new validated numerical model (SpecCAF), which has been shown to accurately reproduce experimentally observed fabrics in both compression and simple shear, to explore the fabrics produced between pure and simple shear, as well as those that are highly rotational. We present a definitive classification of all fabric patterns. We find that intermediate deformations between pure and simple shear result in a smooth transition between a fabric characterised by a cone-shape and a secondary cluster pattern. Highly-rotational fabrics are found to produce a weak girdle fabric. In addition we obtain complete predictions for the strain required for any fabric under a 2D deformation to reach steady state at any given temperature. Use of our data in current ice flow models as well as for ice core fabric and seismic anisotropy interpretation will enhance the communities' ability to predict future ice flow in a changing climate.

Daniel H. M. Richards et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2021-118', Maurine Montagnat, 17 May 2021
    • RC2: 'Short correction on my comments', Maurine Montagnat, 17 May 2021
      • AC1: 'Reply on RC1', Daniel Richards, 27 May 2021
    • AC1: 'Reply on RC1', Daniel Richards, 27 May 2021
  • RC3: 'Comment on tc-2021-118', Anonymous Referee #2, 08 Jun 2021
    • AC2: 'Reply on RC3', Daniel Richards, 16 Jun 2021
  • RC4: 'Comment on tc-2021-118', Fabien Gillet-Chaulet, 29 Jun 2021
    • AC3: 'Reply on RC4', Daniel Richards, 02 Aug 2021

Daniel H. M. Richards et al.

Daniel H. M. Richards et al.

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Short summary
Understanding the orientation of ice grains is key for predicting ice flow. We explore the evolution of these orientations using a new efficient model. We present a complete exploration of the patterns produced under a range of temperatures and deformations, including for the first time a universal regime diagram. We do this for deformations relevant to ice sheets but not studied in experiments. These results can be used to understand drilled ice cores and improve future modelling of ice sheets.