jovian stratospheric circulation: insights from cassini observations
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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
Radiative Model
Circulation
Chemical tracers
Net Heating
Rate
Chemical Model
3
Model Atmosphere
CH4 T
Nixon et al. (2007) Yelle (2001)
4
C2H2C2H6
CIRS data (Nixon et al., 2007)
Model Atmosphere
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
Mass Streamfunction (g/cm/s)
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 ~109 s, compared with C2H2 lifetime ~ 107 s and C2H6 lifetime ~ 1010 s
11
Seasonal Change?
Nixon et al. (2010)
12
Backup Slides
13
14
Temperature used in EPIC-2D
15
D_theta/Dt from EPIC-3D
16
Model
Haze layer:
Aggregated particles (high latitude) Or Mie particles (low latitude)
Refractive index from Ramirez et al. (2002)
Methane, Rayleigh Scattering
Methane, Rayleigh ScatteringP~500 mbar
P~0.3 mbar
P~100 mbar
Profile based on that from Banfield et al. (1998)