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Record #96611:

Interpretation of the temperature profile measured at Vostok, east Antarctica / Catherine Ritz.

Title: Interpretation of the temperature profile measured at Vostok, east Antarctica / Catherine Ritz.
Author(s): Ritz, Catherine.
Date: 1989.
Publisher: Cambridge: International Glaciological Society
In: Annals of Glaciology. (1989.), Vol. 12 (1989)
Abstract: Heat equation is solved, both for ice and for underlying bedrock. Ice core offers 160 000-year climatic record, which is used to define past surface temperature, while variations in accumulation rate are assumed to be governed by saturation vapour pressure. Model is run for several sets of parameters in order to find associations giving good fit between observed and computed temperature profiles. With this model, it is possible to simulate measured temperature profile within 0.1°C. To obtain this good fit, geothermal flux has to be >50 mW m⁻² and present-day accumulation must be <2.6 cm a⁻¹. Sensitivity of these results both to amplitude of change in surface temperature and to velocity profile with depth is also investigated. Ice is at melting point at base of ice sheet, which is in agreement with presence of subglacial lake near Vostok.
Notes:

Annals of Glaciology. Vol. 12 :138-144 (1989).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.3 -- Land ice, depth measurements.
E5 -- Glaciology: land ice.
(*7) -- Antarctic regions.
(*747.5) -- Vostok region.
SPRI record no.: 96611

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245 10 ‡aInterpretation of the temperature profile measured at Vostok, east Antarctica /‡cCatherine Ritz.
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500 ## ‡aAnnals of Glaciology. Vol. 12 :138-144 (1989).
520 3# ‡aHeat equation is solved, both for ice and for underlying bedrock. Ice core offers 160 000-year climatic record, which is used to define past surface temperature, while variations in accumulation rate are assumed to be governed by saturation vapour pressure. Model is run for several sets of parameters in order to find associations giving good fit between observed and computed temperature profiles. With this model, it is possible to simulate measured temperature profile within 0.1°C. To obtain this good fit, geothermal flux has to be >50 mW m⁻² and present-day accumulation must be <2.6 cm a⁻¹. Sensitivity of these results both to amplitude of change in surface temperature and to velocity profile with depth is also investigated. Ice is at melting point at base of ice sheet, which is in agreement with presence of subglacial lake near Vostok.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.3 -- Land ice, depth measurements.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
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