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Modeling the gas flux from the surface of Mars

Benkhoff, J. (1997) Modeling the gas flux from the surface of Mars. DGLR/DLR/DARA-Symposium "Eploration of Moon and Mars", Berlin, 11.-12. Juni 1997.

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Abstract

Results of preliminary calculations to a more comprehensive model forthe surface of Mars will be shown. The results are calculated for thesouth pole area and the equatorial area of the "red planet". Our new program, called CAPS, solves the time-dependent mass and energy equations for the different volatiles simultaneously. Solar energy input varies due to orbital and rotational motion of the planet. Heat is transferred into the interior of the body by solid state heat conduction in the ice-dust mixture (matrix) and by vapor flowing through the porous matrix. In our model we assume that the crust is always stable and cannot be destroyed by the escaping gas or impacts, but we allow atmospheric CO2 gas to condensate at the surface to build a frost layer if the temperature decreases below the sublimation temperature of CO2. We investigated the contribution ofthe vapor phases to the heat transport, calculated the gas flux from the surface into the atmosphere, and in case of a higher atmospheric pressure than the vapor saturation pressure we determined the condensation rate at the surface. The results depend on the composition of initially homogeneous body, the initial porosity, the initial pore radius, the the thermal conductivity of the solid ice matrix, and the tortuosity.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1997,
Title:Modeling the gas flux from the surface of Mars
Authors:
AuthorsInstitution or Email of Authors
Benkhoff, J.UNSPECIFIED
Date:1997
Status:Published
Keywords:Gas flux, surface of Mars
Event Title:DGLR/DLR/DARA-Symposium "Eploration of Moon and Mars", Berlin, 11.-12. Juni 1997
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:UNSPECIFIED
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Institut für Planetenerkundung
Deposited By: elib DLR-Beauftragter
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 09:51

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