Computer Science – Sound
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..125..364n&link_type=abstract
Icarus, Volume 125, Issue 2, pp. 364-368.
Computer Science
Sound
3
Scientific paper
The diminished spherical albedo of Venus from 200 to 500 nm requires at least two different absorbers in the cloud layer. SO_2 has been identified as the dominant absorber between 200 and 320 nm; however, the identity of the second UV absorber which darkens the planet from 320 to 500 nm remains a mystery. We present the results from photochemical calculations of sulfur oxides in the atmosphere of Venus which indicate that S_2O is a strong candidate for the second absorber. The photochemical calculations are constrained by recent observations of SO and SO_2 by a CU/LASP sounding rocket experiment carried out on 29 March 1991. We calculate that the photochemical lifetime of S_2O in the middle atmosphere of Venus is much less than the dynamical mixing time scale, and this can explain the shortest time scales for changes in the dark markings. The calculated vertical profile of S_2O from 58 to 96 km is consistent with constraints on the second absorber. In addition, since S_2O is chemically derived from SO_2, the observed spatial correlation between the second absorber and SO_2 can be directly explained. The conclusion that S_2O is an excellent candidate for the second absorber could be confirmed by laboratory measurements of its absorption cross section.
Esposito W. L. W. L.
Na Chan Y.
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