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[22.02] Cassini/CIRS observations of oxygen compounds in Titan’s Southern Hemisphere

G. L. Bjoraker (NASA/GSFC), R. K. Achterberg (SSAI), C. A. Nixon (U of Maryland), CIRS Team

On 2004 July 2 and 3 the Composite Infrared Spectrometer (CIRS) on the Cassini spacecraft obtained spectra of Titan at distances ranging between 350,000 and 800,000 km. Zonally averaged spectra were produced every 10 degrees of latitude between Titan’s South Pole and the Equator. Stratospheric temperatures in the 0.5 to 5.0 mbar range were obtained by inverting spectra of CH₄ in the \nu₄ band centered at 1304 cm^-1. Carbon dioxide emission at 667 cm^-1 from Titan’s stratosphere was measured at a spectral resolution of 3.0 cm^-1. Carbon monoxide emission was observed in the far infrared (30-65 cm^-1) at higher spectral resolution (0.5 cm^-1) but at lower spatial resolution (50 degrees of latitude.) Upper limits to H₂O emission at 150.5 cm^-1 will be presented. Stratospheric emission of CO observed by CIRS will be compared with tropospheric absorption of CO at 4.7 \mum measured in ground-based spectra (Lellouch et al 2003). Comparisons will also be made with observations of CO₂ and H₂O from the Infrared Space Observatory (Coustenis et al 1998, 2003).

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Bulletin of the American Astronomical Society, 36 #4
© 2004. The American Astronomical Soceity.