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Conditions for bubble elongation in cold ice-sheet ice

Journal of Glaciology

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Abstract

Highly elongated bubbles are sometimes observed in ice-sheet ice. Elongation is favored by rapid ice deformation, and opposed by diffusive processes. We use simple models to show that vapor transport dominates diffusion except possibly very close to the melting point, and that latent-heat effects are insignificant. Elongation is favored by larger bubbles at pore close-off, but is nearly independent of bubble compression below close-off. The simple presence of highly elongated bubbles indicates only that a critical ice-strain rate has been exceeded for significant time, and provides no information on possible disruption of stratigraphic continuity by ice deformation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Conditions for bubble elongation in cold ice-sheet ice
Series title:
Journal of Glaciology
Volume
45
Issue:
149
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
147
Last page:
153
Number of Pages:
7