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The global distribution of long-term total ozone variations during the period 1957–1975


Total ozone observations in the international network have been used as a basis for the analysis of the mean monthly ozone distribution over the globe for the period 1957–75. It has been found that during the period 1961–70 the total ozone amount increased in the Northern Hemisphere by about 12 percent and that this increase seems to be significant at all latitudes. Although the data were sparse for the Southern Hemisphere, there did not appear to be any significant ozone changes during the 10 year period. Relatively large geographic variations were found in the ozone trends and it is suggested that these variations are related to large scale changes in the atmospheric circular pattern.

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London, J., Oltmans, S.J. The global distribution of long-term total ozone variations during the period 1957–1975. PAGEOPH 117, 345–354 (1978).

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Key words

  • Global distribution
  • Ozone
  • Trend