Global Analysis of Recent Total Ozone Fluctuations

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Abstract
Total ozone data for various regions of the world have been examined on a seasonal and annual basis. The increase in total ozone noted during the 1960's appears to have ended, and at United States and British stations there was a significant 2% reduction in ozone between 1970 and 1974, although the annual race of decrease diminished from 0.7% between 1971 and 1972 to 0.2% between 1973 and 1974. In the United States the 2% reduction returned the total ozone value nearly to its 1963 level, but in Great Britain (and at Huancayo, Peru) the decrease amounted to only one-third (one-fifth) of the increase during the 1960's. The existence of a quasi-biennial oscillation in total ozone, variable in phase, amplitude, and period, makes extremely difficult the detection of any effect on the ozone shield due to the large Russian nuclear explosions in 1961 and 1962. We fail to find an unambiguous effect, and suggest that, on a seasonal or annual basis, these nuclear tests could not have reduced the hemispheric... Abstract Total ozone data for various regions of the world have been examined on a seasonal and annual basis. The increase in total ozone noted during the 1960's appears to have ended, and at United States and British stations there was a significant 2% reduction in ozone between 1970 and 1974, although the annual race of decrease diminished from 0.7% between 1971 and 1972 to 0.2% between 1973 and 1974. In the United States the 2% reduction returned the total ozone value nearly to its 1963 level, but in Great Britain (and at Huancayo, Peru) the decrease amounted to only one-third (one-fifth) of the increase during the 1960's. The existence of a quasi-biennial oscillation in total ozone, variable in phase, amplitude, and period, makes extremely difficult the detection of any effect on the ozone shield due to the large Russian nuclear explosions in 1961 and 1962. We fail to find an unambiguous effect, and suggest that, on a seasonal or annual basis, these nuclear tests could not have reduced the hemispheric...

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