Competition between grain growth and grain size reduction in polar ice

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Rößiger, J. , Bons, P. D. , Griera, A. , Jessell, M. W. , Evans, L. , Montagnat, M. , Kipfstuhl, S. , Faria, S. H. and Weikusat, I. (2011): Competition between grain growth and grain size reduction in polar ice , Journal of Glaciology, 57 (205), pp. 942-948 .
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Static (or ‘normal’) grain growth, i.e. grain boundary migration driven solely by grain boundary energy, is considered to be an important process in polar ice. Many ice-core studies report a continual increase in average grain size with depth in the upper hundreds of metres of ice sheets, while at deeper levels grain size appears to reach a steady state as a consequence of a balance between grain growth and grain-size reduction by dynamic recrystallization. The growth factor k in the normal grain growth law is important for any process where grain growth plays a role, and it is normally assumed to be a temperature-dependent material property. Here we show, using numerical simulations with the program Elle, that the factor k also incorporates the effect of the microstructure on grain growth. For example, a change in grain-size distribution from normal to log-normal in a thin section is found to correspond to an increase in k by a factor of 3.5.

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