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The South Pole balloon measurements of the vertical profile of ozone can be integrated to obtain the total column ozone. During most soundings, the balloon obtains altitudes of about 30 km and does not sample the atmosphere above this altitude where 10% or less of the ozone resides.
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Antarctic ozone depletion occurs primarily between the altitudes of 12 and 20 kilometers, a region where polar stratospheric clouds, necessary for the chlorine-catalyzed chemical ozone destruction process, readily form.
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Temperatures in the 20-24 Km region for years represented in the 12-20 Km Ozone and Total Ozone plots.
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