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Record #112865:

Thermal behaviour of glacier and laboratory ice / John F. Nye.

Title: Thermal behaviour of glacier and laboratory ice / John F. Nye.
Author(s): Nye, John F.
Date: 1991.
In: Journal of Glaciology. (1991.), Vol. 37(127) (1991)
Abstract: Relation between size of veins in ice, at three-grain junctions, and temperature has now been verified. Because of latent heat of vein water, ice behaves macroscopically as continuum with anomalous specific heat capacity that depends strongly on temperature: polythermal glacier can thus be regarded as single medium with continuously varying properties, rather than consisting of distinct cold and temperate phases with sharp boundaries between them. Differential equations for heat diffusion in this continuum are presented. To explain local uniformity of vein system seen microscopically, it was necessary to include effect of diffusion of solutes along veins. Presents solutions for model in which two semi-infinite slabs, initially having different temperatures, impurity concentrations and vein sizes, are instantaneously brought into contact. Thus, transition thicknesses between cold and temperate ice are estimated, and also velocities of waves generated from original discontinuity at interface.
Notes:

Journal of Glaciology. Vol. 37(127) :401-413 (1991).

Keywords: 551.32 -- Glaciology.
551.322 -- Ice and snow.
551.324 -- Land ice.
551.324.22 -- Glaciers.
536 -- Heat.
536.65 -- Ice, latent heat.
.000(410) -- British author.
E4 -- Glaciology: physics and chemistry of ice.
SPRI record no.: 112865

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245 10 ‡aThermal behaviour of glacier and laboratory ice /‡cJohn F. Nye.
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500 ## ‡aJournal of Glaciology. Vol. 37(127) :401-413 (1991).
520 3# ‡aRelation between size of veins in ice, at three-grain junctions, and temperature has now been verified. Because of latent heat of vein water, ice behaves macroscopically as continuum with anomalous specific heat capacity that depends strongly on temperature: polythermal glacier can thus be regarded as single medium with continuously varying properties, rather than consisting of distinct cold and temperate phases with sharp boundaries between them. Differential equations for heat diffusion in this continuum are presented. To explain local uniformity of vein system seen microscopically, it was necessary to include effect of diffusion of solutes along veins. Presents solutions for model in which two semi-infinite slabs, initially having different temperatures, impurity concentrations and vein sizes, are instantaneously brought into contact. Thus, transition thicknesses between cold and temperate ice are estimated, and also velocities of waves generated from original discontinuity at interface.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.322 -- Ice and snow.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.22 -- Glaciers.‡2udc
650 07 ‡a536 -- Heat.‡2udc
650 07 ‡a536.65 -- Ice, latent heat.‡2udc
650 07 ‡a.000(410) -- British author.‡2udc
650 07 ‡aE4 -- Glaciology: physics and chemistry of ice.‡2local
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 37(127) (1991) ‡wSPRI-20534
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