The role of aqueous chemistry in determining the composition and cloud structure of the upper troposphere on Uranus

Details The role of aqueous chemistry in determining the composition and cloud structure of the upper troposphere on Uranus The role of aqueous chemistry in determining the composition and cloud structure of the upper troposphere on Uranus

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321l..97c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. L97-L101. NASA-supported rese

Astronomy and Astrophysics

Astrophysics

9

Atmospheric Chemistry, Atmospheric Models, Clouds (Meteorology), Troposphere, Uranus Atmosphere, Abundance, Atmospheric Composition, Hydrogen Sulfide, Methane, Microwave Spectra, Reaction Kinetics, Uranus, Chemistry, Composition, Clouds, Structure, Troposphere, Models, Atmosphere, Abundance, Ammonia, Hydrogen Sulfide, Equilibrium, Mixing, Depletion, Formation, Molecular Processes, Thermodynamics, Reactions, Thermal Effects, Temperature, Radio Methods

Scientific paper

Aqueous chemistry on Uranus affects the atmospheric abundances of NH3 and H2S below the methane cloud base. Here a complete thermochemical equilibrium model for the H2O-NH3-H2S system is presented. Inclusion of H2S increases the aqueous removal of NH3 to 20-30 percent, but aqueous chemistry alone cannot account for the depletion of NH3 in the 150-200-K region of the atmosphere required to fit microwave observations. Formation of NH4SH clouds can account for the observed depletion provided the H2S/NH3 ratio is enhanced by a factor of 4 relative to solar. Perturbations to the chemical balance between N and S, for example by the general circulation on Uranus, would then produce regions with either NH3 or H2S aloft.

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