Variation of Non-Condensables in the Martian Atmosphere

Details Variation of Non-Condensables in the Martian Atmosphere Variation of Non-Condensables in the Martian Atmosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p11a0962x&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P11A-0962

Physics

5405 Atmospheres: Composition And Chemistry, 5409 Atmospheres: Structure And Dynamics, 5462 Polar Regions, 6225 Mars, 3319 General Circulation

Scientific paper

The Martian atmosphere is dominated by CO{_2}, but a small fraction is made up of non-condensables, predominantly Ar and N{_2}. These non-condensables make up about 4.7% of the atmosphere, but this fraction is likely not constant over the seasonal cycle or spatially. The reason for this is that the major gas, CO{_2} condenses in the autumn pole and sublimes at the spring pole, concentrating and diluting, respectively, the non-condensable mass-mixing ratio. The purpose of this study has been to examine the seasonal cycle of non-condensables with a Martian General Circulation Model (GCM) to provide a basis of comparison with data becoming available from the Mars Odyssey spacecraft, and to provide insight into the evolving non-condensable distributions. The model includes a full seasonal cycle of CO{_2} and atmospheric dust.

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