文章基本信息

标题：Conditions for bubble elongation in cold ice-sheet ice
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作者：Alley Richard B. ; Fitzpatrick Joan J.
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：1999
卷号：45
期号：149
页码：147-153
DOI：10.1017/S0022143000003129
出版社：Cambridge University Press
摘要：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.