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CO_2 on Titan

Samuelson, R. E. and Maguire, W. C. and Hanel, R. A. and Kunde, V. G. and Jennings, D. E. and Yung, Y. L. and Aikin, A. C. (1983) CO_2 on Titan. Journal of Geophysical Research A, 88 (A11). pp. 8709-8715. ISSN 0148-0227. doi:10.1029/JA088iA11p08709.

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A sharp stratospheric emission feature at 667 cm^(−1) in the Voyager infrared spectra of Titan is associated with the ν_2 Q branch of CO_2. A coupling of photochemical and radiative transfer theory yields an average mole fraction above the 110 mbar level of ƒCO_2 = 1.5 ± ^(1.5)_(0.8) x 10^(-9), with most of the uncertainty being due to imprecise knowledge of the vertical distribution. CO_2 is found to be in a steady state, with its abundance being regulated principally by the ∼72 K cold trap near the tropopause and secondarily by the rate at which water-bearing meteoritic material enters the top of the atmosphere. An influx of water about 0.4 times that at the top of the terrestrial atmosphere is consistent with a combination of the observed CO_2 abundance and a steady state CO mole fraction of 1.1×10^(−4); the theoretical value for CO is close to the value observed by Lutz et al. (1983), although there are large margins for error in both numbers. If steady state conditions for CO prevail, little information is available regarding the evolution of Titan's atmosphere.

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Yung, Y. L.0000-0002-4263-2562
Alternate Title:CO2 on Titan
Additional Information:This paper is not subject to U.S. copyright. Published in 1983 by the American Geophysical Union. Received September 28, 1982; revised March 16, 1983; accepted March 17, 1983. Paper number 3A0453. We thank J. Fox and R. Prinn for useful discussions. Y. L. Yung acknowledges support by NASA grant NAGW-254 to the California Institute of Technology. The Editor thanks D. F. Strobel and D. E. Shemansky for their assistance in evaluating this paper.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Issue or Number:A11
Record Number:CaltechAUTHORS:20140923-140352880
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Official Citation:Samuelson, R. E., W. C. Maguire, R. A. Hanel, V. G. Kunde, D. E. Jennings, Y. L. Yung, and A. C. Aikin (1983), CO2 on Titan, J. Geophys. Res., 88(A11), 8709–8715, doi:10.1029/JA088iA11p08709.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49950
Deposited By: Ruth Sustaita
Deposited On:23 Sep 2014 21:36
Last Modified:10 Nov 2021 18:50

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