Sources of SO and SO 2 in the Mesosphere of Venus
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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
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Belyaev et al. (2011)
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Zhang et al. (2011)
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SO (H2SO4 Case)
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SO2 (H2SO4 Case)
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SO3 (H2SO4 Case)
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SO (Sx Case)
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SO2 (Sx Case)
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SO3 (Sx Case)
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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 polysulfur above 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.
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Acknowledgement
• NASA Grant • Venus Express Project
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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.