Chemical-dynamical models of the Venus mesosphere based upon diurnal microwave CO variations

Details Chemical-dynamical models of the Venus mesosphere based upon diurnal microwave CO variations Chemical-dynamical models of the Venus mesosphere based upon diurnal microwave CO variations

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...64..183c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 64, Nov. 1985, p. 183-204.

Computer Science

20

Atmospheric Chemistry, Atmospheric Circulation, Carbon Monoxide, Diurnal Variations, Planetary Composition, Venus Atmosphere, Atmospheric Models, Mesosphere, Microwave Spectra, Nocturnal Variations, Solar Planetary Interactions, Turbulent Diffusion

Scientific paper

CO abundance between 95 and 105 km in the Venus atmosphere shows approximately a factor of 2 - 4 enhancement on the nightside relative to the dayside of Venus as indicated by CO microwave observations. Peak nightside CO abundance above ≡95 km occurs very near to the antisolar point on Venus, strongly suggesting that retrograde zonal flow is substantially reduced at an altitude of 100 km in the Venus mesosphere. By contrast, CO abundances between 80 and 90 km altitude show a maximum that is shifted from the antisolar point toward the morningside of Venus. The magnitude of the diurnal variation of CO abundance between 80 and 90 km is again, approximately a factor of 2 - 4. The authors propose that the subsolar to antisolar circulation of the Venus thermosphere (and the resulting nightside enhancement of CO) persists down to altitudes of ≡80 km. Above ≡90 km zonal flow is small and the nightside CO bulge remains centered near the antisolar point on Venus. Below ≡90 km altitude retrograde zonal wind velocities increase abruptly to several tens of meters per second displacing the nightside enhancement of CO toward the morningside of Venus.

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