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The relative abundance of ethane to acetylene in the Jovian stratosphere

Allen, Mark and Yung, Yuk L. and Gladstone, G. Randall (1992) The relative abundance of ethane to acetylene in the Jovian stratosphere. Icarus, 100 (2). pp. 527-533. ISSN 0019-1035. doi:10.1016/0019-1035(92)90115-N.

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The observed ratio of C_2H_6 to C_2H_2 in the Jovian stratosphere increases from ∼55 at 2 mbar to ∼277 at 12 mbar. In current photochemical models this ratio typically increases between 2 and 12 mbar by a factor of ≤3. Recent laboratory kinetics studies on the reaction between C_2H_2 and H_2 to form C_2H_4 suggest an efficient chemical mechanism for hydrogenation of C_2H_2 to C_2H_6. Inclusion of this scheme as part of a comprehensive updated model for hydrocarbon photochemistry in the atmosphere of Jupiter provides an explanation of the altitude variation of the C_2H_6/C_2H_2 ratio. The sensitivity of these results to uncertainties in the key rate constants at low temperatures is illustrated, identifying needs for additional laboratory measurements. Since the key reaction rate constants decrease with decreasing temperature, the hydrogenation of C_2H_2 as proposed predicts a qualitatively decreasing trend in the C_2H_6/C_2H_2 value with decreasing distance from the Sun. The observed variation between Jupiter and Saturn is consistent with this prediction.

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Yung, Yuk L.0000-0002-4263-2562
Additional Information:© 1992 by Academic Press, Inc. Received January 28, 1991; revised July 27, 1992. We thank W. Maguire for communicating the results of the analysis of the Voyager IRIS spectra prior to publication and the anonymous referees for their helpful comments. This work was supported by NASA Grant NAGW 1509 to the California Institute of Technology. Contribution number 4852 from The Division of Geological and Planetary Sciences, California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences4852
Issue or Number:2
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Official Citation:Mark Allen, Yuk L. Yung, G. Randall Gladstone, The relative abundance of ethane to acetylene in the Jovian stratosphere, Icarus, Volume 100, Issue 2, December 1992, Pages 527-533, ISSN 0019-1035, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48415
Deposited By: Tony Diaz
Deposited On:12 Aug 2014 21:07
Last Modified:10 Nov 2021 18:31

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