Preliminary Martian Atmospheric Water Vapour Column Abundances with Mars Climate Sounder

Details Preliminary Martian Atmospheric Water Vapour Column Abundances with Mars Climate Sounder Preliminary Martian Atmospheric Water Vapour Column Abundances with Mars Climate Sounder

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2424l&link_type=abstract

American Astronomical Society, DPS meeting #39, #24.24; Bulletin of the American Astronomical Society, Vol. 39, p.458

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Mars Climate Sounder (MCS) is an infra-red radiometer on board NASA's Mars Reconnaissance Orbiter (MRO) launched in August 2005 and now orbiting Mars in a near circular polar orbit. MCS has nine spectral channels in the range 0.3-50 µm. Goals of MCS include global characterization of atmospheric temperature, dust and water profiles observing temporal and spatial variation.
Using Oxford University's multivariate retrieval algorithm, NEMESIS, we present preliminary determinations of the water vapour column abundance in the Martian atmosphere during the period September-October 2006 (Ls range 111-129°, i.e. northern hemisphere summer). A combination of spectral channels inside and outside the water vapour rotation band (at 50 µm) are used to retrieve the column abundances mainly using nadir observations (as aerosol opacity is less important relative to water vapour opacity in nadir viewing geometry).
We then compare these column abundances to earlier results from the Viking Orbiter Mars Atmospheric Water Detectors (MAWD) and the Thermal Emission Spectrometer (TES) on Mars Global Surveyor.

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