Long-term (1979-1990) changes in the thermal, dynamical, and compositional structure of the Venus mesosphere as inferred from microwave spectral line observations of C-12O, C-13O, and CO-18

Details Long-term (1979-1990) changes in the thermal, dynamical, and compositional structure of the Venus mesosphere as inferred from microwave spectral line observations of C-12O, C-13O, and CO-18 Long-term (1979-1990) changes in the thermal, dynamical, and compositional structure of the Venus mesosphere as inferred from microwave spectral line observations of C-12O, C-13O, and CO-18

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...89..129c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 89, Jan. 1991, p. 129-146.

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36

Atmospheric Composition, Carbon Monoxide, Line Spectra, Microwave Spectra, Thermodynamic Properties, Venus Atmosphere, Carbon Isotopes, Carbon 12, Carbon 13, Mesosphere, Oxygen 18, Venus, Atmosphere, Mesosphere, Thermal Properties, Dynamics, Temperature, Composition, Microwave Methods, Wavelengths, Carbon Monoxide, Isotopes, Spectra, Mixing, Nightside, Spacecraft Observations, Pressure Gradient, Comparisons, Latitude, Abundance, Altitude, Earth-Based Observations, Analysis, Procedure, Parameters

Scientific paper

Detailed analyses of whole-disk spectra of Venus C-12O and C-13O, obtained near inferior conjunctions in 1982, 1985, 1986, 1988, and 1990, have yielded low to mid-latitude average CO mixing profiles and 85-100 km temperature profiles for the nightside Venus mesosphere. The 1985 and 1986 results indicate a 20-40 K enhancement of 85-100 km temperatures relative to Pioneer Venus measurements. The CO mixing ratio at 80-km altitude increased by several hundred percent from 1982 to 1985. It is suggested that these temperature and CO perturbations in 1985-1986 are related to such other phenomena as the 1979 decay of cloud-top SO2, within the framework of interannual variations in global-scale dynamics within and above the Venus atmosphere's cloud layers.

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