Preprints
https://doi.org/10.5194/tc-2021-22
https://doi.org/10.5194/tc-2021-22

  18 Feb 2021

18 Feb 2021

Review status: a revised version of this preprint was accepted for the journal TC and is expected to appear here in due course.

Orientation selective grain sublimation-deposition in snow under temperature gradient metamorphism observed with Diffraction Contrast Tomography

Rémi Granger1,2, Frédéric Flin2, Wolfgang Ludwig3, Ismail Hammad3, and Christian Geindreau1 Rémi Granger et al.
  • 1Univ. Grenoble Alpes, CNRS, Grenoble INP, 3SR, F-38000 Grenoble, France
  • 2Univ. Grenoble Alpes, Université de Toulouse, Météo-France, CNRS, CNRM, Centre d’Etudes de la Neige, 38000 Grenoble
  • 3ESRF, BP 220 38043 Grenoble Cedex, France

Abstract. In this study on temperature gradient metamorphism in snow, we investigate the hypothesis that there exists a favorable crystalline orientation relative to the temperature gradient, giving rise to a faster formation of crystallographic facets. We applied in-situ time-lapse Diffraction Contrast Tomography on a snow sample with a density of 476 kg m−3 subject to a temperature gradient of 52 °C m−1 at mean temperatures in the range between −4.1 °C and −2.1 °C for three days. The orientations of about 900 grains along with their microstructural evolution are followed over time. Faceted crystals appear during the evolution and from the analysis of the material fluxes, we indeed observe higher sublimation-deposition rate for grains with their c-axis in the horizontal plane at the beginning of the metamorphism. This remains the case up to the end of the experiment for what concerns sublimation while the differences vanish for deposition. That latter observation is explained in terms of geometrical interactions between grains.

Rémi Granger et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2021-22', Ian Baker, 20 Feb 2021
    • AC1: 'Reply on RC1', Rémi Granger, 19 May 2021
  • RC2: 'Comment on tc-2021-22', Henning Loewe, 15 Apr 2021
    • AC2: 'Reply on RC2', Rémi Granger, 19 May 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2021-22', Ian Baker, 20 Feb 2021
    • AC1: 'Reply on RC1', Rémi Granger, 19 May 2021
  • RC2: 'Comment on tc-2021-22', Henning Loewe, 15 Apr 2021
    • AC2: 'Reply on RC2', Rémi Granger, 19 May 2021

Rémi Granger et al.

Rémi Granger et al.

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Short summary
In this study on temperature gradient metamorphism in snow, we investigate the hypothesis that there exists a favorable crystalline orientation relative to the temperature gradient, giving rise to a faster formation of crystallographic facets, using Diffraction Contrast Tomography. Faceted crystals appear during the evolution and from the analysis of the material fluxes, we indeed observe higher sublimation-deposition rate for grains with specific crystalline orientation.