Marine ice deformation experiments: an empirical validation of creep parameters

Authors

  • Marie Dierckx,

    Corresponding author
    1. Laboratoire de Glaciologie, CP 160/03, Université Libre de Bruxelles, Bruxelles, Belgium
    • Corresponding author: Marie Dierckx, Laboratoire de Glaciologie, Département des Sciences de la Terre et de l'Environnement, Université Libre de Bruxelles, CP 160/03, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium. (mdierckx@ulb.ac.be)

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  • Jean-Louis Tison

    1. Laboratoire de Glaciologie, CP 160/03, Université Libre de Bruxelles, Bruxelles, Belgium
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Abstract

[1] Marine ice is increasingly recognized as an important component of ice shelves in Antarctica. Because it mainly accretes in “weak” locations, it plays a crucial role in ice shelf stability. Little is known however on the rheology of this particular material (low salinity, no bubbles, specific fabrics). We present marine ice deformation experiments in unconfined uniaxial compression at −10 °C, −6 °C, and −3 °C. Generally, marine ice samples confirm the value of n = 3 for Glen's power law. It also appears to behave systematically “harder” than artificial or meteoric isotropic ice samples used in the past, in the studied stress condition. Bulk salinity does not seem to have a significant impact on the viscosity. All deformation curves compare well with a generalized empirical temperature/viscosity relationship. They represent the first experimental validation of the lower boundary of this rheological relationship recommended for use in modeling ice dynamics.

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