Computer Science
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...42..330l&link_type=abstract
Icarus, vol. 42, June 1980, p. 330-337.
Computer Science
13
Atmospheric Chemistry, Planetary Crusts, Venus Atmosphere, Venus Surface, Abundance, Geochemistry, Mass Spectrometers, Oxidation, Pioneer Venus Spacecraft, Sulfur Compounds, Venus, Pioneer Venus, Crust, Atmosphere, Oxidation, Models, Sulfur, Chemistry, Lithosphere, Sulfur Dioxide, Hydrogen Sulfide, Concentrations, Fugacity, Oxygen, Iron, Silicates, Absorption, Hydrogen, Abundance, Mass Spectroscopy, Gases, Minerals, Data, Comparisons, Earth
Scientific paper
Recent spacecraft observations of Venus permit a detailed model of sulfur chemistry in the atmosphere-lithosphere system. Pioneer Venus experiments confirm that, as predicted, COS and H2S are dominant over SO2 in the lower atmosphere, and that the equilibrium concentrations of S2 and S3 are significant. Many criteria serve to bracket the oxidation state of the crust: it is nearly certain that the S2(2-)/SO4(2-) buffer regulates the oxygen fugacity, and that FeO is at least as abundant as F2O3 in crustal silicates. A highly oxidized crust (as, for example, would result from O2 absorption complementary to escape of vast amounts of H2) is incompatible with the gas-phase sulfur chemistry. If the Pioneer Venus mass spectrometer estimates of the abundance of sulfur gases are correct, earth-like models for the bulk composition of Venus are seriously in error, and a far lower FeO content is required for Venus.
Kreimendahl F. A.
Lewis Scott J.
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