Reports

Global Trends in Total Atmospheric Ozone

Science  31 May 1974:
Vol. 184, Issue 4140, pp. 987-989
DOI: 10.1126/science.184.4140.987

Abstract

Analyses of the mean monthly global distributions of total ozone for the 13-year period from 1957 through 1970 reveal an upward trend of about 7.5 percent per decade in the Northern Hemisphere and about 2.5 percent per decade in the Southern Hemisphere. The increase seems to have started about March 1961 in the Northern Hemisphere and about September 1961 in the Southern Hemisphere. The cause of these trends is at present unknown.

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