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Record #96597:

Modes of operation of thermo-mechanically coupled ice sheets / Richard C.A. Hindmarsh, Geoffrey S. Boulton, Kolumban Hutter.

Title: Modes of operation of thermo-mechanically coupled ice sheets / Richard C.A. Hindmarsh, Geoffrey S. Boulton, Kolumban Hutter.
Author(s): Hindmarsh, Richard C. A.
Boulton, Geoffrey S.
Hutter, Kolumban.
Date: 1989.
Publisher: Cambridge: International Glaciological Society
In: Annals of Glaciology. (1989.), Vol. 12 (1989)
Abstract: Using dimensionless model, three thermal processes are identified: dissipation, advection, and conduction, with time-scales of, respectively, thousands of years, tens of thousands of years, and 100,000 years. Kinematical processes occur on marginal advective and diffusive time-scales. Coupling with temperature field in bed produces fluctuations to depth of few km, which means that horizontal conduction in bed can be ignored except perhaps in marginal area. Thermal inertia of bed could produce significant fluctuations in geothermal heat gradient. Operation of coupled system is explored with time-dependent thermo-mechanically coupled numerical algorithm. Dependence of basal friction on temperature is introduced heuristically, and enthalpy method is used to represent effect of latent heat. Marginal area is dissipation-driven and always reaches melting point. Divide area can show two modes of behaviour: warm-based, where ice sheet is thin, and cold-based, where it is thick. Which mode operates depends upon applied temperature field and amount of heat conducted from bed. Calculations where sliding is limited were not found to be possible owing to problems with reduced model which resulted in violation of approximation conditions at margin.
Notes:

Annals of Glaciology. Vol. 12 :57-69 (1989).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.51 -- Land ice, theory of flow.
519.673 -- Modelling.
E5 -- Glaciology: land ice.
SPRI record no.: 96597

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245 10 ‡aModes of operation of thermo-mechanically coupled ice sheets /‡cRichard C.A. Hindmarsh, Geoffrey S. Boulton, Kolumban Hutter.
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500 ## ‡aAnnals of Glaciology. Vol. 12 :57-69 (1989).
520 3# ‡aUsing dimensionless model, three thermal processes are identified: dissipation, advection, and conduction, with time-scales of, respectively, thousands of years, tens of thousands of years, and 100,000 years. Kinematical processes occur on marginal advective and diffusive time-scales. Coupling with temperature field in bed produces fluctuations to depth of few km, which means that horizontal conduction in bed can be ignored except perhaps in marginal area. Thermal inertia of bed could produce significant fluctuations in geothermal heat gradient. Operation of coupled system is explored with time-dependent thermo-mechanically coupled numerical algorithm. Dependence of basal friction on temperature is introduced heuristically, and enthalpy method is used to represent effect of latent heat. Marginal area is dissipation-driven and always reaches melting point. Divide area can show two modes of behaviour: warm-based, where ice sheet is thin, and cold-based, where it is thick. Which mode operates depends upon applied temperature field and amount of heat conducted from bed. Calculations where sliding is limited were not found to be possible owing to problems with reduced model which resulted in violation of approximation conditions at margin.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.51 -- Land ice, theory of flow.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
700 1# ‡aBoulton, Geoffrey S.
700 1# ‡aHutter, Kolumban.
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