Isotopic exchange between carbon dioxide and ozone via O(1D) in the stratosphere.
We propose a novel mechanism for isotopic exchange between CO2 and O3 via O(1D) + CO2 --> CO3* followed by CO3* --> CO2 + O(3P).  A one-dimensional model calculation shows that this mechanism can account for the enrichment in 18O in the stratospheric CO2 observed by Gamo et al. [1989], using the heavy O3 profile observed by Mauersberger [1981].  The implications of this mechanism for other stratospheric species and as a source of isotopically heavy CO2 in the troposphere are briefly discussed.
Yung
Y L
YL
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91125, USA.
DeMore
W B
WB
Pinto
J P
JP
D001272:Atmosphere; D002245:Carbon Dioxide / Q000737:chemistry*; D018534:Earth, Planet; D008956:Models, Chemical; D010103:Oxygen Isotopes; D010126:Ozone / Q000737:chemistry*; D010777:Photochemistry; D010782:Photolysis
D010103:Oxygen Isotopes; D002245:Carbon Dioxide; D010126:Ozone