Venus. I - Carbon monoxide distribution and molecular-line searches

Details Venus. I - Carbon monoxide distribution and molecular-line searches Venus. I - Carbon monoxide distribution and molecular-line searches

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...45..624w&link_type=abstract

Icarus, vol. 45, Mar. 1981, p. 624-637. Research supported by the Aerospace Corp. and Miller Institute for Basic Research

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23

Absorption Spectra, Carbon Monoxide, Millimeter Waves, Molecular Spectra, Venus Atmosphere, Vertical Distribution, Abundance, Atmospheric Models, Line Spectra, Molecular Rotation, Venus, Carbon Monoxide, Distribution, Atmosphere, Absorption, Density, Wavelengths, Spectrum, Mixing, Observations, Composition, Temperatures, Theoretical Studies, Mathematical Models, Comparisons, Pressure, Data, Altitude, Abundance

Scientific paper

An observational program to study variations of the vertical distribution of CO in the Venus atmosphere is presented. Measurements of the J = 0 - 1 absorption line at 2.6 mm wavelength are reported for two phase angles in 1977, one near eastern elongation (February) and the other near inferior conjunction (April). The two spectra are significantly different, with the April absorption line being narrower and deeper. The results of numerical inversion calculations show that the CO mixing ratio increases by a factor of approximately 100 between 78 and 100 km and that the CO abundance above approximately 100 km is greatest on the night-side hemisphere. These conclusions are in qualitative agreement with theoretical models. In addition to the CO observations, a search for other molecules was made to provide further information on the composition of the Venus middle atmosphere. The J = 0 - 1 transition of (C-13)O was detected and upper limits were derived for nine other molecules.

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