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Stratospheric Circulation of Jupiter

Stratospheric Circulation of Jupiter. Xi Zhang 1,2 R. L. Shia 2 , A. P. Showman 1 , and Y. L. Yung 2 1 LPL, University o f Arizona, United States 2 California Institute of Technology, United States Supported by Bisgrove Postdoctoral Scholar Fellowship Apr 11, 2013, Wien. Outline.

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Stratospheric Circulation of Jupiter

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  1. Stratospheric Circulation of Jupiter Xi Zhang1,2 R. L. Shia2, A. P. Showman1, and Y. L. Yung2 1LPL, University of Arizona, United States 2California Institute of Technology, United States Supported by Bisgrove Postdoctoral Scholar Fellowship Apr 11, 2013, Wien

  2. Outline • Introduction • Derive the stratospheric circulation based on Cassini and Voyager data • Problem and possible solutions

  3. Earth Brower (1949), Dobson (1956), Figures from Seinfeld and Pandis (2006) ? Jovian Stratosphere Residual mean meridional circulation/ Horizontal eddy mixing Based on Sieff et al. (1998)

  4. How to derive the circulation pattern? • Dynamical Simulation (requires wave properties) • Diagnostic Approach (based on diabatic heating rate map) Conrath et al. (1990); West et al. (1992); Moreno and Sedeno (1997) • Tracer Approach (based on tracer distributions and 2-D chemical transport model) Friedsonet al. (1999); Liang et al. (2005); Lellouch et al. (2006)

  5. Diagnostic Approach Conrath et al. (1990) Radiatively Driven Mechanically Driven West et al. (1992) Without Aerosol Heating With Aerosol Heating

  6. Tracer Approach • Diffusional transport dominates, based on SL-9 dust data (Friedson et al., 1999) and C2H2 and C2H6 data (Liang et al., 2005) • Horizontal advection is not negligible, based on SL-9 HCN and CO2 data (Lellouch et al., 2006) Liang et al. (2005) Lellouch et al. (2006)

  7. This Study • Temperature and tracer maps from Cassini CIRS + Voyager IRIS spectra (Zhang et al., 2013a) • Global stratospheric aerosol map from Cassini ISS data (Zhang et al., 2013b) • Revisit both approaches Zhang et al. (2013b) Zhang et al. (2013a) ~10nm

  8. Diagnostic Approach Without Aerosol Heating With Aerosol Heating West et al. (1992) This study: Aerosol heating effect is significant

  9. Tracer Approach • State-of-art Caltech/JPL 2-D chemical transport model, validated against analytical solutions (Zhang et al., 2013c) • Residual circulation pattern derived, advection is not negligible. Observation Model with

  10. Two patterns are not consistent Diagnostic Approach Tracer Approach • Uncertainties in the radiativediabatic heating rate ? • Atmosphere not in steady state? • Possible missing chemistry?

  11. Test possible polar ethane source • Assume there is a strong ethane source (10 times larger than the photochemical source) from ion-chemistry in the aurora region Observation Model with horizontal mixing

  12. Summary • Residual mean meridional circulation pattern(s) derived based on: (1) radiativediabatic heating rate map (2) tracer distributions and chemical transport model • Two patterns are not consistent • Possible solutions are discussed Diagnostic Approach Tracer Approach

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