CO on titan: evidence for a well-mixed vertical profile

Details CO on titan: evidence for a well-mixed vertical profile CO on titan: evidence for a well-mixed vertical profile

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995icar..117..375g&link_type=abstract

Icarus, vol. 117, pp. 375-382

Physics

29

Abundances, Atmospheres, Titan

Scientific paper

We report on new microwave heterodyne observations of the CO J(1-0) rotational transition from the stratosphere of Titan made in October 1994 with the Owens Valley Radio Observatory millimeter array. The spectrum obtained clearly exhibits a strong emission core over the ~600-MHz bandwidth of the upper sideband spectrometer. The lineshape, referenced to the flat spectrum simultaneously observed in the lower sideband, was inverted to determine a best fit CO mixing ratio profile consistent with the observations. The best fit profile is a constant mixing ratio of 50+/-10 ppm over the altitude range of 60-200 km. Combined with IR observations of tropospheric CO at 60 ppm (B. L. Lutz et al. 1983, Science 220, 1374-1375), this result provides strong evidence that CO is well mixed from the surface to at least 200 km in Titan's atmosphere.

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