OMEGA/Mars Express Observations of Water Vapor over the Hellas Basin

Details OMEGA/Mars Express Observations of Water Vapor over the Hellas Basin OMEGA/Mars Express Observations of Water Vapor over the Hellas Basin

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2405e&link_type=abstract

American Astronomical Society, DPS meeting #39, #24.05; Bulletin of the American Astronomical Society, Vol. 39, p.454

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used the OMEGA imaging spectrometer aboard Mars Express to study the evolution of the water vapor abundance over the Hellas basin during a seasonal cycle. The water vapor mixing ratio and column density have been inferred from the monitoring of the depth of the 2.6-micron water band. Our results confirm the water vapor enhancement at high southern latitude during southern summer (about 20 pr-microns), and its very low content during southern winter, in agreement with previous TES measurements and GCM predictions. However, our results show a significant departure from the models around northern spring equinox (330-50 deg.). At that time of the seasonal cycle, the observed water content is very low, while a high abundance is expected from the GCM. The origin of this discrepancy remains to be understood.

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