Diurnal Variations of atmospheric Temperature and Water Ice Opacity over the Phoenix Landing Site observed by Mars Climate Sounder

Details Diurnal Variations of atmospheric Temperature and Water Ice Opacity over the Phoenix Landing Site observed by Mars Climate Sounder Diurnal Variations of atmospheric Temperature and Water Ice Opacity over the Phoenix Landing Site observed by Mars Climate Sounder

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4404k&link_type=abstract

American Astronomical Society, DPS meeting #41, #44.04

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The Mars Climate Sounder (MCS) is a mid- and far-infrared thermal emission radiometer on board the Mars Reconnaissance Orbiter (MRO). From the measured radiances, vertical profiles of atmospheric temperature, dust and water ice opacity are retrieved up to altitudes of about 80 km. While MRO is in a sun-synchronous orbit around Mars, MCS performed 17 time-of-day campaigns between June and November 2008. Each observation campaign lasted 24 to 48 hours. During each campaign, off-track observations were used to sample the atmosphere at different local times above the Phoenix landing site. We present a first analysis of these measurements. The diurnal variations in the temperature profiles are characterized by a strong component due to the diurnal tide, which exhibits its clearest signature in northern mid-summer. Variations of higher orders are also observed, in particular in late-spring/early-summer and late-summer/early-fall. Water ice cloud formation tends to occur predominantly in the late morning hours at altitudes between 20 and 35 km, and cloud ice opacity increases dramatically towards the end of the Phoenix operations in late-summer/early-fall.

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