1. 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 (2) New Mexico Institute of Mining and Technology, USA (3) JPL, USA (4) University of Louisville, Kentucky, USA 1

2. Radiative Model Circulation Chemical tracers Net Heating Rate Chemical Model

3. Model Atmosphere CH 4 T Nixon et al. (2007) Yelle (2001) 3

4. C2H2C2H2 C2H6C2H6 CIRS data (Nixon et al., 2007) Model Atmosphere 4

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

6. Solar Heating Rate (erg/g/s) 6 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) 7

8. Zonal Wind from EPIC-2D 8

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

10. Conclusion Jet structures seen in the stratosphere of Jupiter Residual mean circulation implies the meridional mass transport timescale at 1 mbar ~10 9 s, compared with C 2 H 2 lifetime ~ 10 7 s and C 2 H 6 lifetime ~ 10 10 s 10

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

12. Backup Slides 12

13. 13

14. Temperature used in EPIC-2D 14

15. D_theta/Dt from EPIC-3D 15

16. Model Haze layer: Aggregated particles (high latitude) Or Mie particles (low latitude) Refractive index from Ramirez et al. (2002) Methane, Rayleigh Scattering P~500 mbar P~0.3 mbar P~100 mbar Profile based on that from Banfield et al. (1998) 16