Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus
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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. Important Processes in the Atmosphere of Venus. Catalytic Chemical Cycles Heterogeneous Chemistry

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Chemical sources and sinks of ocs in the lower atmosphere of venus

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


Important processes in the atmosphere of venus
Important Processes in the Atmosphere of Venus Venus

  • Catalytic Chemical Cycles

  • Heterogeneous Chemistry

  • Middle Atmosphere Circulation

  • OCS as tracers of chemistry and dynamics


Venus model description
Venus model description Venus

  • Two-dimensional Caltech/JPL KINETICS chemical transport model

  • Solve continuity equation for 24 species with ~200 chemical reactions (subset of Mills’)


Role of circulation
Role of circulation Venus

  • Affect the upward flux of OCS from the surface

  • Reduce OCS abundances at high latitudes


Chemical sources and sinks of ocs in the lower atmosphere of venus

S Venus

hv

S2

S

S3

OCS

S4

CO

hv

hv

S

hv

hv

S2

S3

hv

S4

S8

S4

S


Conclusions
Conclusions Venus

  • 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]


Acknowledgements
Acknowledgements Venus

  • NASA and ESA

  • P. Drossart

  • R. L. Shia

  • K. Baines

  • D. Crisp

  • C. Lee

  • X. Jiang

  • B. Bezard

  • E. Marq


Not used
Not Used Venus