GRAIN GROWTH IN UNSTRAINED GLACIAL ICE.

Richard B. Alley, C. R. Bentley, J. H. Perepezko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The abstract refers to theories for grain growth driven by surface tension and curvature of grain boundaries to explain published data on grain growth in cold glacial ice that is not deforming rapidly. Among other results, it is proposed that small grain sizes in Wisconsinan ice are caused by large concentrations of soluble impurities. The rate of increase is nearly the same in firn and ice, although it may be slightly less in ice; Grain sizes are smaller in ice rich in volcanic tephra than in adjacent, clean ice; Bubbles, which form on grain boundaries at the firn-ice transition, separate from grain boundaries in a discrete depth interval below the transition; and Grain size decreases downward across the firn-ice transition. Model calculations show that compression of bubbles deeper than the firn-ice transition reduces their mobility below that of grain boundaries so that bubble-boundary separation should occur; such separation is observed. The downward decrease in grain size across the Holocene-Wisconsinan boundary correlates with a downward increase in soluble impurities, especially NaCl. Additional study results are referred to.

Original languageEnglish (US)
Title of host publicationJournal de Physique (Paris), Colloque
Pages659-660
Number of pages2
Edition3
StatePublished - Mar 1 1987

Publication series

NameJournal de Physique (Paris), Colloque
Number3
Volume48
ISSN (Print)0449-1947

Fingerprint

Grain growth
Ice
Grain boundaries
Impurities
Surface tension
Compaction

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Alley, R. B., Bentley, C. R., & Perepezko, J. H. (1987). GRAIN GROWTH IN UNSTRAINED GLACIAL ICE. In Journal de Physique (Paris), Colloque (3 ed., pp. 659-660). (Journal de Physique (Paris), Colloque; Vol. 48, No. 3).
Alley, Richard B. ; Bentley, C. R. ; Perepezko, J. H. / GRAIN GROWTH IN UNSTRAINED GLACIAL ICE. Journal de Physique (Paris), Colloque. 3. ed. 1987. pp. 659-660 (Journal de Physique (Paris), Colloque; 3).
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Alley, RB, Bentley, CR & Perepezko, JH 1987, GRAIN GROWTH IN UNSTRAINED GLACIAL ICE. in Journal de Physique (Paris), Colloque. 3 edn, Journal de Physique (Paris), Colloque, no. 3, vol. 48, pp. 659-660.

GRAIN GROWTH IN UNSTRAINED GLACIAL ICE. / Alley, Richard B.; Bentley, C. R.; Perepezko, J. H.

Journal de Physique (Paris), Colloque. 3. ed. 1987. p. 659-660 (Journal de Physique (Paris), Colloque; Vol. 48, No. 3).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Alley RB, Bentley CR, Perepezko JH. GRAIN GROWTH IN UNSTRAINED GLACIAL ICE. In Journal de Physique (Paris), Colloque. 3 ed. 1987. p. 659-660. (Journal de Physique (Paris), Colloque; 3).