Horizontal and Vertical Distribution of SO2 in the Venus Clouds From SPICAV UV spectrometer.

Details Horizontal and Vertical Distribution of SO2 in the Venus Clouds From SPICAV UV spectrometer. Horizontal and Vertical Distribution of SO2 in the Venus Clouds From SPICAV UV spectrometer.

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p22a..05b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P22A-05

Physics

0340 Middle Atmosphere: Composition And Chemistry, 0343 Planetary Atmospheres (5210, 5405, 5704), 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 3672 Planetary Mineralogy And Petrology (5410), 6295 Venus

Scientific paper

The two bands of UV absorption of SO2 at 180-220 and 280-300 nm may be used to detect SO2 in the upper atmosphere of Venus. On board Venus Express mission, the UV spectrometer (118 - 320 nm, resolution 1.5 nm) of SPICAV is dedicated to nadir viewing, limb viewing and vertical profiling by stellar and solar occultation. In the solar occultation mode, SO2 is seen up to 100 km with a mixing ratio of about 1 ppmv, a puzzling result since it should be photo-dissociated at this altitude. In the stellar occultation mode which is performed at night, SO2 is also seen up to 100 km, possibly resulting from the evaporation of H2SO4 cloud droplets. In nadir orientation, SPICAV UV analyzes the albedo spectrum (solar light scattered back from the clouds) to retrieve SO2, and the distribution of the UV-blue absorber (of still unknown origin) on the day side with implications for cloud structure, and atmospheric dynamics. The abundance of SO2 and its scale height are determined by comparison of the measured albedo spectrum with the output of a radiative transfer code, yielding horizontal distributions. Results obtained from the various modes of observation will be compared.

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