Venus - Chemistry of the lower atmosphere prior to the Pioneer Venus mission

Details Venus - Chemistry of the lower atmosphere prior to the Pioneer Venus mission Venus - Chemistry of the lower atmosphere prior to the Pioneer Venus mission

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..973p&link_type=abstract

Geophysical Research Letters, vol. 5, Nov. 1978, p. 973-976.

Physics

6

Atmospheric Chemistry, Atmospheric Models, Lower Atmosphere, Venus Atmosphere, Gas Mixtures, Photochemical Reactions, Reaction Kinetics, Sulfur Compounds, Vertical Distribution, Venus, Chemistry, Atmosphere, Venera 9, Pioneer Venus, Gases, Temperatures, Kinetic Theory, Oxidation, Equilibrium, Concentrations, Sulfur, Clouds, Surface, Carbon Monoxide, Evaporation, Diffusion, Sulfur Dioxide, Sulfur Trioxide, Hydrogen Sulfide, Carbonyl Sulfide

Scientific paper

On the basis of laboratory studies of the high-temperature kinetics of a number of sulfur gases together with a simple chemical-dynamical model of the lower atmosphere of Venus it is concluded that the relative concentrations of photochemically produced oxidized sulfur gases (SO2, SO3) and thermochemically produced reduced sulfur gases (COS, S2, H2S) are strongly dependent on the rate of vertical mixing. For values of the vertical eddy diffusion coefficient in excess of 10,000 sq cm/sec it is predicted that the reduced gases will dominate over the oxidized gases in the lower atmosphere. Measurements of the important sulfur gases by Pioneer Venus will thus provide valuable knowledge of lower atmospheric mixing in addition to furthering our understanding of the chemistry which maintains the visible sulfuric acid cloud layer.

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