1. Modeling of OCS in the Lower Atmosphere of Venus Yuk L. Yung M. C. Liang, X. Jiang, C. Lee, B. Bezard and E. Marq California Institute of Technology yly@gps.caltech.edu DPS Meeting Oct 7-12, 2007

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. No heterogeneous sink

9. Heterogeneous sink by aerosols

11. Modeling the Distribution of OCS in the Lower Atmosphere of Venus Yuk L. Yung M. C. Liang, X. Jiang, C. Lee, B. Bezard and E. Marq California Institute of Technology yly@gps.caltech.edu DPS 39 Meeting Oct 7-12, 2007

12. Acknowledgements NASA and ESA P. Drossart R. L. Shia K. Baines D. Crisp