Abstract
It is argued that the best explanation for the 1980-1982 Total Ozone Mapping Spectrometer (TOMS) data showing a decline in zonal monthly mean total ozone for Octobers between 1979 and 1985/86 for all latitudes south of 40 S (as reported by Stolarski and Schoeberl, 1986) is a near-cancellation between an ozone source and a newly developed chemical sink for ozone, with both initiated by the arrival of spring in the southern hemisphere. In a reply by Schoeberl and Stolarski, additional TOMS observations are reported which suggest that some uncompensated ozone loss may be occurring in the spring Antarctic in the most recent years. A significant change in the midlatitude ozone source appears to have occurred as well. The observations show the importance of the final warming in setting up the summertime ozone distribution.
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