Treverrow, A and Le'Gallais, B and Roberts, J, Laboratory observations of the high temperature creep of polycrystalline ice, Abstract Proceedings Open Science Conference, 19-23 June 2018, Davos, Switzerland, pp. 1622. ISBN 9780948277542 (2019) [Conference Extract]
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Factors influencing creep deformation rates include: the magnitudes of the stresses causing ice to deform; strain-induced anisotropy of polycrystalline ice, and temperature. Creep rates at high temperatures, within 2 degrees (K) of the melting point, are constrained by a relatively small number of laboratory observations due to the inherent difficulties in conducting experiments at such temperatures.
We present results from a series of laboratory ice deformation experiments conducted in simple shear at temperatures between -2°C and -0.3°C at 0.1 MPa (octahedral shear stress). Unlike previous experimental studies conducted at temperatures close to the melting point, these experiments were continued through to high shear strains (>10% strain) to ensure that anisotropic flow, compatible with the stress configuration, had developed.
These data contribute to the continued development of a constitutive relationship for polycrystalline ice that will improve the accuracy of ice sheet models and are relevant to model studies utilizing inverse methods to infer the spatial extent of basal sliding.
|Item Type:||Conference Extract|
|Keywords:||ice sheet, rheology, polar, constitutive relationship, ice, polycrystalline|
|Research Division:||Earth Sciences|
|Research Group:||Physical geography and environmental geoscience|
|Objective Division:||Environmental Policy, Climate Change and Natural Hazards|
|Objective Group:||Understanding climate change|
|Objective Field:||Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts)|
|UTAS Author:||Treverrow, A (Dr Adam Treverrow)|
|UTAS Author:||Le'Gallais, B (Miss Bridie Le'Gallais)|
|Deposited By:||Oceans and Cryosphere|
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