Isotopic exchange between carbon dioxide and ozone via O(^1D) in the stratosphere

Creators: Yung, Yuk L.; DeMore, W. B.; Pinto, Joseph P.

Abstract

We propose a novel mechanism for isotopic exchange between CO_2 and O_3 via O(^1D) + CO_2 → CO_3^* followed by CO_3^* → CO_2 + O(^3P). A one-dimensional model calculation shows that this mechanism can account for the enrichment in ^(18)O in the stratospheric CO_2 observed by Gamo et al. [1989], using the heavy O_3 profile observed by Mauersberger [1981]. The implications of this mechanism for other stratospheric species and as a source of isotopically heavy CO_2 in the troposphere are briefly discussed.

Additional Information

© 1991 by the American Geophysical Union. Paper number 90GL02478. Received August 6, 1990; revised October 9, 1990; accepted November 5, 1990. We thank M. Allen, S. Epstein,R . Friedl, K. Mauersberger, D. Michelangeli, and S. Sanderf or useful discussions, and M. Gunson and M. Thiemens for conmunication of results prior to publication. One of us (YLY) wishes to thank J.-S. Wen for drawingh is attention to the work of Gamo et al., and sharing with him his experimental insights. This research was supported by NASA grant NAGW-413 to California Institute of Technology and EPA grant 9D4 25 NALX to California Institute of Technology, and by the Jet Propulsion Laboratory, California Institute of Technology under contract with NASA. Contribution number 4889 from the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.

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