Sulfur dioxide in the Venus atmosphere - Distribution and implications

Details Sulfur dioxide in the Venus atmosphere - Distribution and implications Sulfur dioxide in the Venus atmosphere - Distribution and implications

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..601e&link_type=abstract

Geophysical Research Letters, vol. 6, July 1979, p. 601-604.

Astronomy and Astrophysics

Astronomy

15

Atmospheric Composition, Atmospheric Models, Sulfur Dioxides, Venus Atmosphere, Vertical Distribution, Abundance, Astronomical Models, Brightness, Light Scattering, Pioneer Venus 1 Spacecraft, Ultraviolet Spectra, Ultraviolet Spectrometers, Venus, Atmosphere, Sulfur Dioxide, Pioneer Venus, Orbiter, Spectrometer, Ultraviolet, Wavelengths, Absorption, Models, Rayleigh Scattering, Telescopic Observations, Opacity, Clouds, Oxidation, Hydration, Photochemistry, Chemical Composition, Temperature, Aerosols, Sulfur

Scientific paper

The Pioneer Venus Orbiter ultraviolet spectrometer sees variable disk brightness features similar to the well-known 'UV markings' seen at longer wavelengths. The bright features are consistent with a homogeneous cloud of H2SO4 aerosols. The darker features show the presence of a broad-band absorber, which is at some depth in the cloud layer. Additional contrast arises from SO2 absorption. The observed strength of the SO2 absorption as a function of wavelength rules out a uniform mixing ratio for the SO2. The data are well fitted by an inhomogeneous light scattering model in which the SO2 scale height is one-fifth of the CO2 scale height, and the mixing ratio of SO2 at 40 mb is 10 to the -7th. A model of the oxidation of sulfur dioxide in the upper cloud reproduces the observed vertical distribution of SO2 and indicates that SO2 alone is sufficient to produce the observed amount of H2SO4 in this region.

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