The basic physicochemical factors controling the chemical composition of the Venus cloud layer

Details The basic physicochemical factors controling the chemical composition of the Venus cloud layer The basic physicochemical factors controling the chemical composition of the Venus cloud layer

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979geokh.....1759v&link_type=abstract

Geokhimiia, Dec. 1979, p. 1759-1766. In Russian.

Physics

Atmospheric Composition, Chemical Composition, Photochemical Reactions, Physical Chemistry, Planetary Composition, Venus Clouds, Aerosols, Hydrochloric Acid, Particle Size Distribution, Stratosphere, Sulfuric Acid, Thermodynamic Equilibrium, Venera Satellites, Water Vapor

Scientific paper

Chemical reactions occurring in the cloud layer of Venus are considered in light of the geochemical model in which photochemically oxidized and convectively rising reduced constituents interact in the cloud layer. Analysis of the phase diagram of the H2SO4-H2O system shows that concentrated H2SO4 condensate aerosols in the cloud layer are thermodynamically stable and indicates that the nonuniform water vapor distribution is probably due to dynamic factors. Analysis of the HCl-H2O diagram indicates that hydrochloric acid droplets can exist only in equilibrium at water vapor relative partial pressures between 0.001 and 0.01, and thus the coexistence of H2SO4 and HCl is possible only if the cloud mixing rate is greater than the rate of reaction between H2SO4 and HCl. The presence of liquid chlorine and sulfur compound in aerosols is found to be thermodynamically forbidden.

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