C d parkinson brecht s w bougher f mills m allen x zhang and y l yung dps 2010 poster 10 4
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Photochemical Distribution of Venusian Sulphur and Halogen Species AND Why Vulcanism cannot be the source for Venusian SO 2 above 80km . C. D. Parkinson Brecht, S. W. Bougher , F. Mills, M. Allen, X. Zhang and Y. L. Yung DPS 2010 (Poster 10.4).

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C. D. Parkinson Brecht, S. W. Bougher , F. Mills, M. Allen, X. Zhang and Y. L. Yung

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C d parkinson brecht s w bougher f mills m allen x zhang and y l yung dps 2010 poster 10 4

Photochemical Distribution of VenusianSulphurand Halogen SpeciesANDWhy Vulcanism cannot be the source for Venusian SO2 above 80km

C. D. Parkinson

Brecht, S. W. Bougher, F. Mills, M. Allen,

X. Zhang and Y. L. Yung

DPS 2010 (Poster 10.4)


Temperature h 2 so 4 and eddy mixing profiles

Temperature, H2SO4, and Eddy Mixing Profiles


Eddy mixing sensitivity study case profiles

Eddy Mixing Sensitivity Study Case Profiles


Std reference higher h 2 so 4 svp computations

Std Reference & higher H2SO4 SVP Computations


Important reaction pathways related to so so 2 so 3 and h 2 so 4

Important reaction pathways related to SO, SO2, SO3 and H2SO4


Parameter space for possible solutions

Parameter space for possible solutions

Blue shaded area shows parameter space where model predicts SO2

mixing ratios between 0.01 and 1 ppm at 100 km

Golden line = max values of SO2 (67 ppb) from microwave measurements of Sandor et al (2010)


Model c atmosphere so x and o x mixing ratio

Model C Atmosphere: SOx and Ox Mixing Ratio


Model c atmosphere halogens mixing ratio

Model C Atmosphere: Halogens Mixing Ratio


Eddy mixing sensitivity study so x

Eddy Mixing Sensitivity Study: SOx


Eddy mixing sensitivity study halogens

Eddy Mixing Sensitivity Study: Halogens


Dayside nightside temperature sensitivity study so x

Dayside/Nightside Temperature Sensitivity Study: SOx


Dayside nightside temperature sensitivity study halogens

Dayside/Nightside Temperature Sensitivity Study: Halogens


So 2 boundary condition sensitivity study so x

SO2 Boundary Condition Sensitivity Study: SOx

No change in SO2 above 80 km due to pulse in lower atmosphere

Vulcanism not the source of SO2 above this point


So 2 boundary condition sensitivity study halogens

SO2 Boundary Condition Sensitivity Study: Halogens


Conclusions

Conclusions

  • SO2, SO, and halogen species are most sensitive to change in eddy mixing.

  • Least amount of change to SOx and ClOx from temperature changes.

  • Effects on sulphur compounds seems more evident/pronounced for lower boundary value changes in SO2 mixing ratio below ~80 km, and little effect above ~80 km ÔÉ®vulcanism not the source!!!

  • Effects on ClOx compounds seems more evident/pronounced for lower boundary value changes in SO2 mixing ratio at the below ~90 km, and little effect above ~90 km, with no change in HCl profile.


C d parkinson brecht s w bougher f mills m allen x zhang and y l yung

  • Preliminary modeling suggests lower HCl abundances result in greater abundances of SO2, SO, and SO3 generally lower O2 abundances, and greater ClO abundances.

  • We will use some of this 1-D chemistry and resulting tracer species profiles in the Venus Thermospheric General Circulation Model (VTGCM) (Bougher et al, 1997) for further comparison to VExdatasets.


Std reference atmosphere so x and o x number density

Std Reference Atmosphere: SOx and Ox Number Density


Std reference atmosphere halogens number density

Std Reference Atmosphere: Halogens Number Density


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