HR: 09:00h
AN: P41B-05 [Abstracts]
TI: Stratospheric composition of Titan from Cassini/CIRS observations
AU: * Coustenis, A
EM: Athena.Coustenis@obspm.fr
AF: LESIA,
Obs. de Paris-Meudon, 5, place Jules Jannsen, Meudon, 92195
France
AU: B\'ezard, B
EM: bruno.bezard@obspm.fr
AF: LESIA,
Obs. de Paris-Meudon, 5, place Jules Jannsen, Meudon, 92195
France
AU: Lellouch, E
EM: emmanuel.lellouch@obspm.fr
AF: LESIA,
Obs. de Paris-Meudon, 5, place Jules Jannsen, Meudon, 92195
France
AU: Fouchet, T
EM: thierry.fouchet@obspm.fr
AF: LESIA,
Obs. de Paris-Meudon, 5, place Jules Jannsen, Meudon, 92195
France
AU: Conrath, B
EM: barney.j.conrath@gsfc.nasa.gov
AF: CRSR, Cornell University, Ithaca, NY 14853
United States
AU: Achterberg, R K
EM: Richard.K.Achterberg@gsfc.nasa.gov
AF: SSAI/
Lab. Extrat. Phys., NASA/GSFC
Code 693, Greenbelt, MD 20771
United States
AU: Jennings, D E
EM: donald.e.jennings@gsfc.nasa.gov
AF: NASA/GSFC, Code 693, Greenbelt, MD 20771
United States
AU: Bjoraker, G
EM: gordon.bjoraker@gsfc.nasa.gov
AF: NASA/GSFC, Code 693, Greenbelt, MD 20771
United States
AU: Flasar, M
EM: f.m.flasar@nasa.gov
AF: NASA/GSFC, Code 693, Greenbelt, MD 20771
United States
AB:
We have analyzed data recorded by the Composite Infrared Spectrometer (CIRS) aboard Cassini mission during the first Titan
fly-by (July 2-3 2004). The spectra characterize essentially regions around Titan's south pole and up to 5 deg S (with higher
emission angles) from the emission observed in the 3 CIRS detectors (covering roughly the 10-1500 cm$^{-1}$ spectral range
with a 0.53 cm$^{-1}$ apodized resolution). The composite spectrum shows a large variety of molecular signatures :
hydrocarbons, nitriles and 3 oxygen components. We have used a temperature profile retrieved by inversion of the emission
observed in the methane $\nu_4$ band at 1304 cm-$^{-1}$ and a line-by-line radiative transfer code to infer the abundances of
the trace constituents in Titan's stratosphere. We compare these mixing ratios with values retrieved two Titan seasons ago
by V1 and V2 IRIS observations and with more recent disk-averaged Infrared Space Observatory (ISO) results.
DE: 5405 Atmospheres--composition and chemistry
DE: 5464 Remote sensing
DE: 6280 Saturnian satellites
SC: Planetary Sciences [P]
MN: 2004 AGU Fall Meeting