Mapping of CO millimeter-wave lines in Mars' atmosphere - The spatial variability of carbon monoxide on Mars

Details Mapping of CO millimeter-wave lines in Mars' atmosphere - The spatial variability of carbon monoxide on Mars Mapping of CO millimeter-wave lines in Mars' atmosphere - The spatial variability of carbon monoxide on Mars

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..219l&link_type=abstract

(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (

Computer Science

36

Atmospheric Composition, Carbon Monoxide, Mars Atmosphere, Millimeter Waves, Planetary Mapping, Spatial Distribution, Atmospheric Attenuation, Diurnal Variations, Thematic Mapping, Wave Propagation, Mars, Carbon Monoxide, Atmosphere, Radiowave Methods, Mixing Ratio, Earth-Based Observations, Thermal Properties, Structure, Symmetry, Analysis, Chemistry, Depletion

Scientific paper

Millimeter-wave observations of Mars in the J = 2 - 1 rotational lines of (C-12)O and (C-13)O were performed during the September 1988 opposition, with the IRAM 30-m radiotelescope. The narrow beam of the facility (about 12 arcsec at 230 GHz) made it possible to map the line profiles as a function of the position on the disk. For each region of the disk, the simultaneous observations of the (C-12)O and (C-13)O line allow the inference of the CO mixing ratio - assumed to be constant with altitude - and the atmospheric thermal structure. The observations are consistent with a spatially uniform CO, with a relative abundance to CO2 of 8 + or - 2 x 10 to the -4. There is, however, a marginal suggestion of modest (about 40 percent) hemispheric asymmetry and increase of the CO mixing ratio during the course of the Martian day.

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