Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification

Morris, Elizabeth M.; Montgomery, Lynn N.; Mulvaney, Robert ORCID: https://orcid.org/0000-0002-5372-8148. 2022 Modelling the transition from grain-boundary sliding to power-law creep in dry snow densification. Journal of Glaciology, 68 (269). 417-430. 10.1017/jog.2021.95

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Abstract/Summary

This paper presents a physics-based macroscale model for the densification of dry snow which provides for a smooth transition between densification by grain-boundary sliding (stage 1) and densification by power-law creep (stage 2). The model uses established values of the stage 1 and 2 densification rates away from the transition zone and two transition parameters with a simple physical basis: the transition density and the half-width of the transition zone. It has been calibrated using density profiles from the SUMup database and physically based expressions for the transition parameters have been derived. The transition model produces better predictions of the depth of the nominal bubble close-off horizon than the Herron and Langway model, both in its classical form and in a recent version with re-optimised densification rates.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1017/jog.2021.95
ISSN:	0022-1430
Additional Keywords:	ice core, polar firn, ice physics
Date made live:	14 Apr 2022 07:04 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532512

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