Premelting increases the rate of regelation by an order of magnitude

Glacier sliding over small obstacles relies on melting on their upstream sides and refreezing downstream. Previous treatments have appealed to ‘pressure melting’ as the cause of the spatial variations in melting temperature that drive this regelation process. However, we show that typical liquid pre...

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Published in:Journal of glaciology 2019-06, Vol.65 (251), p.518-521
Main Authors: REMPEL, ALAN W., MEYER, COLIN R.
Format: Article
Language:English
Subjects:
Barriers
Deformation
Deformation mechanisms
Equilibrium
glacier modeling
Glaciers
Heat
Heat flow
Heat transmission
Ice
ice dynamics
ice physics
Ice pressure
Melt temperature
melt-basal
Melting
Permeability
Pressure
Pressure variations
Reynolds number
Spatial variations
subglacial processes
Temperature changes
Temperature effects
Temperature gradients
Velocity
Wavelength
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cited_by cdi_FETCH-LOGICAL-c402t-32590bcec6891054b194850cca3e98856d45e7be5131ece4d15046a221ab3b63
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container_end_page 521
container_issue 251
container_start_page 518
container_title Journal of glaciology
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creator REMPEL, ALAN W.
MEYER, COLIN R.
description Glacier sliding over small obstacles relies on melting on their upstream sides and refreezing downstream. Previous treatments have appealed to ‘pressure melting’ as the cause of the spatial variations in melting temperature that drive this regelation process. However, we show that typical liquid pressure variations across small obstacles are negligible and therefore variations in ice pressure closely approximate variations in effective stress. For a given change in effective stress, the equilibrium melting temperature changes by an order of magnitude more than when the pressure of ice and liquid both change by an equal amount. In consequence, the temperature gradients that drive heat flow across small obstacles are larger than previously recognized and the rate of regelation is faster. Under typical conditions, the transition wavelength at which ice deformation and regelation contribute equally is of m-scale, several times longer than previous predictions, which have been reported to underestimate field inferences.
doi_str_mv 10.1017/jog.2019.33
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ispartof Journal of glaciology, 2019-06, Vol.65 (251), p.518-521
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source Publicly Available Content Database; Cambridge University Press
subjects Barriers
Deformation
Deformation mechanisms
Equilibrium
glacier modeling
Glaciers
Heat
Heat flow
Heat transmission
Ice
ice dynamics
ice physics
Ice pressure
Melt temperature
melt-basal
Melting
Permeability
Pressure
Pressure variations
Reynolds number
Spatial variations
subglacial processes
Temperature changes
Temperature effects
Temperature gradients
Velocity
Wavelength
title Premelting increases the rate of regelation by an order of magnitude
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