Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995icar..113..110e&link_type=abstract
Icarus (ISSN 0019-1035), vol. 113, no. 1, p. 110-118
Computer Science
22
Detection, Mars Atmosphere, Millimeter Waves, Vertical Distribution, Water Vapor, Annual Variations, Atmospheric Models, Opacity, Single Sideband Transmission, Very Large Array (Vla)
Scientific paper
The 183-GHz water vapor line was tentatively detected on Mars in January 1991, with the IRAM 30-m millimeter antenna, under extremely dry atmospheric conditions. The measurement refers to the whole disk. The spectral line, although marginally detected, can be fit with a constant H2O mixing ratio of 1.0 x 10-5, which corresponds to a water abundance of 1 pr-microns; in any case, an upper limit of 3 pr-microns is inferred. This value is comparable to the very small abundances measured by Clancy (1992) 5 weeks before our observation and seems to imply both seasonal and long-term variations in the martian water cycle.
Cernicharo Jose
Encrenaz Th.
Gulkis Sam
Lellouch Emmanuel
Paubert Gabriel
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