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Conditions for bubble elongation in cold ice-sheet ice

January 1, 1999

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.

Publication Year 1999
Title Conditions for bubble elongation in cold ice-sheet ice
Authors R. B. Alley, J. J. Fitzpatrick
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Glaciology
Index ID 70022129
Record Source USGS Publications Warehouse