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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. Chemical tracers Radiative Model Chemical Model Net Heating Rate Circulation

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

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

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

  6. Solar Heating Rate (erg/g/s) For haze information, see P119: Zhang, et al., Aerosol and Cloud in the Atmosphere of Jupiter, EPSC-DPS2011-311

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

  8. Zonal Wind from EPIC-2D

  9. Residual Mean Circulation With haze w/o haze Mass Streamfunction(g/cm/s)

  10. 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

  11. Seasonal Change? Nixon et al. (2010)

  12. Backup Slides

  13. Temperature used in EPIC-2D

  14. D_theta/Dt from EPIC-3D

  15. 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

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