Sulfur dioxide at the Venus cloud tops, 1978-1986

Details Sulfur dioxide at the Venus cloud tops, 1978-1986 Sulfur dioxide at the Venus cloud tops, 1978-1986

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5267e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, May 20, 1988, p. 5267-5276.

Computer Science

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43

Satellite Sounding, Sulfur Dioxides, Ultraviolet Spectroscopy, Venus Clouds, Abundance, Calibrating, Correlation Coefficients, Pioneer Venus Spacecraft, Venus, Clouds, Sulfur Dioxide, Spectroscopy, Ultraviolet, Wavelengths, Pvo Mission, Pioneer Venus Missions, Orbiters, Spacecraft Observations, Abundance, Polar Regions, Haze, Hypotheses, Injection, Volcanism, Uvs Instrument, Models, Procedure, Atmosphere, Rotation

Scientific paper

Ultraviolet spectroscopy from the Pioneer Venus Orbiter shows a decline in the cloud top abundance of SO2 from about 100 ppb to about 10 ppb in the period 1978-1986. A consistent decline in polar haze has occurred over the same period, with the correlation coefficient between these two observables of r = 0.8. Star calibrations determine the instrument sensitivity to within 10 percent which rules out the possibility that this is an instrumental effect. Systematic errors could increase the SO2 abundance to twice the inferred values in later orbits. Tracking of SO2 features and power spectral analysis give rotation periods for the longer-lived features of 3.6-5.2 days, consistent with cloud-tracked winds observed at other wavelengths. The behavior of SO2 and polar haze can be plausibly explained by episodic injection of SO2 into the cloud top regions, for example, by active volcanism.

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