Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8134924 | Icarus | 2016 | 9 Pages |
Abstract
The photochemical model for the middle atmosphere of Venus (Krasnopolsky, V.A. [2012] Icarus, 218, 230-246) predicts sulfur aerosol as a product of the OCS photolysis at 55-60Â km. The calculated mass loading is much smaller than that of the mode 1 particles in the upper cloud layer. The chemical kinetic model for the lower atmosphere ( Krasnopolsky, V.A. [2013], Icarus, 225, 570-580) results in a constant mixing ratio of 20Â ppm for OCSÂ +Â XSX. This means the S8 mixing ratio of 2.5Â ppm near the model upper boundary at 47Â km. Using this abundance, the calculated profile of the sulfur aerosol has a bottom that coincides with the lower boundary of modes 2 and 3 and constitutes â¼10% of the total mass loading in the lower cloud layer. Sulfur aerosol cannot be the near UV absorber because its abundance is too low at the cloud tops and disagrees with the profile of the absorber observed by Venera 14.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
Vladimir A. Krasnopolsky,