Seasonal Variations of the Martian CO Over Hellas as Observed by Omega/Mars Express

Details Seasonal Variations of the Martian CO Over Hellas as Observed by Omega/Mars Express Seasonal Variations of the Martian CO Over Hellas as Observed by Omega/Mars Express

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6016e&link_type=abstract

American Astronomical Society, DPS meeting #38, #60.16; Bulletin of the American Astronomical Society, Vol. 38, p.600

Astronomy and Astrophysics

Astronomy

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Scientific paper

The OMEGA imaging spectrometer aboard Mars Express has been used to study the evolution of the CO abundance over the Hellas basin as a function of solar longitude. Over Hellas, the depth of the CO(2-0) is sufficient to allow us to retrieve the CO mixing ratio. Our data cover the ranges Ls = 130-150° and Ls = 250-50°. They suggest an enhancement at Ls = 130-150° (end of southern winter) by a factor of at least 2 with regard to its minimum value, which occurs at Ls = 330-350° (end of northern summer). The maximum CO mixing ratio is 2770 +/- 770 ppm (Ls = 132°) and the minimum value is 760 +/- 360 (Ls = 339°). This behavior appears consistent with the GCM predictions which indicate an enrichment by a factor 2-3 of non-condensible species over Hellas during southern winter (Forget et al., 2006).

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