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[1] Heavy oxygen isotope enrichment in stratospheric CO 2 has been identified in the past as a direct result of the large O 3 isotope anomaly though no simultaneous measurements are known. Results from 8 stratospheric balloon flights at two latitudes are reported that provide now a complete oxygen isotope analysis of both gases.

Abstract. Ozone isotope data for 4903 and 500 3 are presented, that were obtained from 28 stratospheric samples collected over 10 years onboard balloon payloads. Enrichments for 4903 range from 7 to 9% in the middle stratosphere. This is in very good agreement with laboratoryderived isotope predictions. For 5ø03 most enrichments are between 7 and 11%, a few, however, are too high to be of atmospheric origin. Arguments are presented that stratospheric ozone isotope data are consistent with enrichments determined in laboratory studies when pressure and temperature dependence of the isotope effect is included. Results from recent remote sensing experiments support the values obtained during balloon-borne sample collections. Very high enrichments occasionally measured in the past should be disregarded.

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