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Numerical Implementation of Ice Rheology for Europa's ShellWe present a discussion of approximations to the temperature dependent part of the rheology of ice. We have constructed deformation maps using the superplastic rheology of Goldsby & Kohlstedt and find that the rheologies that control convective flow in the Europa's are likely grain boundary sliding and basal slip for a range of grain sizes 0.1 mm < d < 1 cm. We compare the relative merits of two different approximations to the temperature dependence of viscosity and argue that for temperature ranges appropriate to Europa, implementing the non-Newtonian, lab-derived flow law directly is required to accurately judge the onset of convection in the ice shell and temperature gradient in the near-surface ice.
Document ID
20040055351
Document Type
Conference Paper
Authors
Barr, A. C. (Colorado Univ. Boulder, CO, United States)
Pappalardo, R. T. (Colorado Univ. Boulder, CO, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Workshop on Europa's Icy Shell: Past, Present, and Future
Subject Category
Lunar and Planetary Science and Exploration
Funding Number(s)
CONTRACT_GRANT: NGT5-50337
CONTRACT_GRANT: NCC2-1340
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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