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Published January 27, 2006 | Supplemental Material + Published
Journal Article Open

Isotopic composition of stratospheric ozone


We present a kinetic calculation for the isotopic composition of stratospheric ozone. The calculated enrichments of ^(49)O_3 and ^(50)O_3 are in agreement with atmospheric measurements made at midlatitudes. Integrating the kinetic fractionation processes in the formation and photolysis of ozone, we obtain enrichments of ∼7.5–10.5 and ∼7.5–12.5% (referenced to atmospheric O_2) for δ^(49)O_3 and δ^(50)O_3, respectively, at altitudes between 20 and 35 km; the photolysis in the Hartley band of ozone is responsible for the observed altitude variation. The overall magnitude of the ozone enrichments (∼10%) is large compared with that commonly known in atmospheric chemistry and geochemistry. The heavy oxygen atom in ozone is therefore useful as a tracer of chemical species and pathways that involve ozone or its derived products. For example, the mass anomalies of oxygen in two greenhouse gases, CO_2 and N_2O, are likely the consequences of the transfer of heavy oxygen atoms from ozone.

Additional Information

© 2006 The American Geophysical Union. Received 8 June 2005; Revised 23 September 2005; Accepted 24 October 2005; Published 18 January 2006. Special thanks to Yi-Qin Gao for helping us on the ozone formation model.We also thank Mimi Gerstell, Jack Margolis, Run-Lie Shia, and Geoff Toon for their helpful comments. This work was supported by an NSF grant ATM-9903790.

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Published - jgrd12427.pdf

Supplemental Material - jgrd12427-sup-0001-t01.txt


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