Download presentation
Presentation is loading. Please wait.
1
Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus Yuk L. Yung M. C. Liang, California Institute of Technology yly@gps.caltech.edu EGU Meeting 2008
2
Important Processes in the Atmosphere of Venus Catalytic Chemical Cycles Heterogeneous Chemistry Middle Atmosphere Circulation OCS as tracers of chemistry and dynamics
3
Venus model description Two-dimensional Caltech/JPL KINETICS chemical transport model Solve continuity equation for 24 species with ~200 chemical reactions (subset of Mills’)
4
Role of circulation Affect the upward flux of OCS from the surface Reduce OCS abundances at high latitudes
8
S2S2 OCS S3S3 S4S4 S8S8 hv S S CO S4S4 S2S2 S S3S3 S4S4 hvS
11
Conclusions Scale height of OCS cannot be explained by photolysis alone Photosensitized dissociation of OCS via polysulfur photochemistry Integrated destruction rate of OCS is 23,000 Tg- S/yr [Earth = 10 Tg-S/yr]
12
Acknowledgements NASA and ESA P. Drossart R. L. Shia K. Baines D. Crisp C. Lee X. Jiang B. Bezard E. Marq
13
Not Used
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.