The Abundance of Carbon Monoxide in Titan's Atmosphere

Details The Abundance of Carbon Monoxide in Titan's Atmosphere The Abundance of Carbon Monoxide in Titan's Atmosphere

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2001n&link_type=abstract

American Astronomical Society, DPS meeting #28, #20.01; Bulletin of the American Astronomical Society, Vol. 28, p.1129

Astronomy and Astrophysics

Astronomy

Scientific paper

The spectrum of Titan near 5mu m is dominated by absorption from the carbon monoxide 1-0 vibration-rotation band. The position of the band edge is a sensitive function of the abundance of CO in the lower troposphere and/or the depth of the reflecting layer in the atmosphere. In the most likely case, 5mu m radiation is reflected from the surface yielding a mole fraction of qCO = 10 {+10atop -5} ppm. This value is significantly lower than the previous measurement of CO in the troposphere (Lutz et al. 1983) or the most recent determination of the stratospheric abundance (Gurwell and Muhlemann 1995). However, it is in excellent agreement with the predicted equilibrium abundance of CO in Titan's atmosphere (Lara et al. 1996), eliminating the need for a source of CO from Titan's surface. Oxygen containing-molecules in the contemporary Titan atmosphere may derive exclusively from sources external to the satellite. Fig 1. The spectrum of Titan measured with the UKIRT CGS4 spectrometer (triangles and diamonds) is compared to a series of model spectra with CO mole fractions of 2, 5, 10 (solid), 20, and 60 ppm respectively.

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