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[24.05] Ozone retrieval from SPICAM UV nadir observations: a first global view of ozone on Mars

S. Perrier, J.L. Bertaux, F. Lefaävre (Service d'aeronomie, France), S. Lebonnois (LMD, France), A. Fedorova, O. Korablev (IKI, Moscow), E. Quemerais, F. Montmessin (Service d'aeronomie, France), SPICAM Team

The dual UV/IR spectrometer SPICAM on board MARS-EXPRESS is mainly dedicated to monitor the composition of the Mars atmosphere. The majority of the spectra taken by SPICAM in the range 110 to 320 nm are in a nadir geometry (downward looking mode) where Mars is observed through the atmosphere. Some of these UV spectra contain a disctinct spectral signature of ozone: a broad absorption band around 255 nm. We present the method used to retrieve the total column-integrated ozone quantity from the nadir-geometry spectra. The results for more than half-a-martian year will be shown and compared to the Global Circulation Model predictions for various seasons and latitudes. A first attempt to establish an ozone martian climatology will be presented.

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Bulletin of the American Astronomical Society, 37 #3
© 2004. The American Astronomical Soceity.