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Jovian Stratospheric Circulation: Insights from Cassini Observations

Jovian Stratospheric Circulation: Insights from Cassini Observations. X. Zhang (1), R. Cosentino (2), R. Morales- Juberias (2), R. A. West (3), S. Coffing (2), T. E. Dowling (4), M. Allen (3) and Y . L. Yung (1 ) (1 ) Caltech , USA

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Jovian Stratospheric Circulation: Insights from Cassini Observations

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  1. Jovian Stratospheric Circulation: Insights from CassiniObservations X. Zhang (1), R. Cosentino (2), R. Morales-Juberias (2), R. A. West (3), S. Coffing (2), T. E. Dowling (4), M. Allen (3) and Y. L. Yung (1) (1 )Caltech, USA (2) New MexicoInstituteof MiningandTechnology, USA (3) JPL, USA (4) University of Louisville, Kentucky, USA

  2. Model Atmosphere T CH4 Yelle (2001) Nixon et al. (2007)

  3. Model Atmosphere C2H6 C2H2 CIRS data (Nixon et al., 2007)

  4. ISS Image (phase angle: 17.5 degree) UV1 (258 nm) MT3 (889 nm) CB3 (938 nm)

  5. Solar Heating Rate (erg/g/s)

  6. Thermal Cooling Rate (erg/g/s) Net Heating Rate (erg/g/s)

  7. Zonal wind from EPIC-2D

  8. Residual Circulation Streamfunction (g/cm/s)

  9. Conclusion • Jet structures seen in the stratosphere of Jupiter • Residual mean circulation implies the meridional mass transport timescale at 1 mbar ~109 s, compared with C2H2 lifetime ~ 107 sand C2H6 lifetime ~ 1010 s

  10. Backup Slides

  11. Residual Circulation (gas only)

  12. Temperature from EPIC-2D

  13. D_theta/Dt from EPIC-3D

  14. Model Methane, Rayleigh Scattering Haze layer: Aggregated particles (high latitude) Or Mie particles (low latitude) Refractive index from Ramirez et al. (2002) P~0.3 mbar Profile based on that from Banfield et al. (1998) P~100 mbar Methane, Rayleigh Scattering P~500 mbar Cloud layer: Mie particles: 0.7 micron, 1.535+0i

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