Physics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...33..537f&link_type=abstract
Icarus, vol. 33, Mar. 1978, p. 537-553.
Physics
5
Atmospheric Composition, Atmospheric Models, Geochemistry, Venus Atmosphere, Atmospheric Temperature, Chemical Composition, Oxidation-Reduction Reactions, Photochemical Reactions, Thermodynamic Equilibrium, Troposphere, Venus Clouds, Venus, Troposphere, Geochemical Experiments, Models, Clouds, Sulfuric Acid, Atmosphere, Chemical Composition, Thermal Properties, Physical Properties, Zoning
Scientific paper
A geochemical model of the Venus troposphere based on a theoretical generalization of available data and equilibrium calculations for the O-H-C-N-S system is proposed. The model is based on the concept of geochemical zoning. The upper zone is characterized by the predominance of photochemical processes and presumably is comprised of sulfuric acid clouds. The lower zone is characterized by the predominance of thermochemical processes assumed to be in complete or limited equilibrium. The intermediate zone represents a zone of mixing of photochemical and thermochemical reaction products. Complexity and instability of the microcomponent gaseous and condensate compositions as well as the occurrence of redox transformations are considered to be the major features of this zone. The ammonia salts, sulfur, and some complex organic compounds are suggested as probable cloud condensate particles in this zone. The proposed vertical geochemical zoning is modified in relation to diurnal variations. The lower non-sulfuric-acid cloud layer practically disappears at noon with the predicted corresponding decrease of mixing ratios of reduced gases (e.g., NH3, CO, H2) within the intermediate zone. The lower cloud layer is restored at night.
Florenskii C. P.
Nikolaeva Ol'ga V.
Volkov V. P.
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