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Sources of SO and SO 2 in the Mesosphere of Venus

Sources of SO and SO 2 in the Mesosphere of Venus Yuk L. Yung, X. Zhang, M. C. Liang, F. P. Mills, D. A. Belyaev Caltech EPSC-DPS 2011, NANTES, FRANCE. Belyaev et al. (2011). Zhang et al. (2011). SO ( H 2 SO 4 Case ). SO 2 ( H 2 SO 4 Case ). SO 3 ( H 2 SO 4 Case ).

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Sources of SO and SO 2 in the Mesosphere of Venus

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  1. Sources of SO and SO2 in the Mesosphere of Venus Yuk L. Yung, X. Zhang, M. C. Liang, F. P. Mills, D. A. Belyaev Caltech EPSC-DPS 2011, NANTES, FRANCE

  2. Belyaev et al. (2011)

  3. Zhang et al. (2011)

  4. SO (H2SO4 Case)

  5. SO2 (H2SO4 Case)

  6. SO3 (H2SO4 Case)

  7. SO (Sx Case)

  8. SO2 (Sx Case)

  9. SO3 (Sx Case)

  10. Conclusion • A sulfur source is required to explain the SO2 inversion layer above 80 km. • The evaporation of the aerosols composed of sulfuric acid or polysulfurabove 90 km could provide the sulfur source. • Measurements of SO3 and SO (a1∆→X3∑) emission at 1.7 μm may be the key to distinguish between the two models.

  11. Acknowledgement • NASA Grant • Venus Express Project

  12. References • Belyaev, D. et al., 2010, Vertical profiling of SO2 and SO above Venus' clouds by SPICAV/SOIR solar occultations, Icarus, In press. • Krasnopolsky, V.A., 2011, Vertical profile of H2SO4 vapor at 70–110 km on Venus and some related problems. Icarus, doi:10.1016/j.icarus.2011.06.036 • Sandor, B. J., et al., 2010, Sulfur chemistry in the Venus mesosphere from SO2 and SO microwave spectra, Icarus 208, 49-60. • Sandor, B.J., Clancy, R.T., Moriarty-Schieven, G.H., 2011, Upper limits for H2SO4 in the mesosphere of Venus. Icarus. doi:10.1016/j.icarus.2011.03.032. • Zhang, X., et al., 2011, Sulfur chemistry in the middle atmosphere of Venus. Icarus, doi:10.1016/j.icarus.2011.06.016.

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