MARCI Ultraviolet Global Imaging of Mars Ozone and Clouds

Details MARCI Ultraviolet Global Imaging of Mars Ozone and Clouds MARCI Ultraviolet Global Imaging of Mars Ozone and Clouds

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p23b0059c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P23B-0059

Physics

0320 Cloud Physics And Chemistry, 5405 Atmospheres (0343, 1060), 5410 Composition (1060, 3672), 5445 Meteorology (3346), 5494 Instruments And Techniques

Scientific paper

The Mars Color Imager (MARCI) experiment onboard the Mars Reconnaissance Orbiter (MRO) incorporates a unique ultraviolet (UV) imaging capability which, coupled with the MARCI wide-angle (180 deg) field-of-view, supports daily global mapping of Mars in two relatively narrow band (30nm FWHM) UV channels. A short wave 260 nm channel is positioned to measure Hartley band ozone absorption relative to a long wave 320nm continuum channel. Mars ozone abundances anticorrelate with atmospheric water vapor due to the catalytic destruction of odd oxygen by HOx photolysis products of water vapor. Both MARCI UV channels also display strongly contrasted clouds against the very dark UV surface albedo of Mars. The global coverage of these UV image pairs yields temporal (daily) and spatial (8 km/pixel) sampling appropriate to monitoring meteorological variations in Mars atmospheric ozone(water), clouds, and dust (via MARCI visible-wave channels). As of the submission date of this abstract, MARCI UV flight observations consist of an (unresolved) calibration image of the Earth 3 days after the August 12, 20005 launch of MRO, and a March 24, 2005 imaging pass of Mars southern latitudes centered on 340W longitude just after MRO orbit insertion. Mapping observations begin in late September of 2006, corresponding to the aphelion climate season on Mars. We will present MARCI UV ozone and cloud maps of the major climatological features of this key Mars season; including the aphelion cloud belt, the northern summer polar cap, and southern winter high latitudes.

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