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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999

FROM VOLUME 3, NUMBER 8, AUGUST 1990

NEWS...
BRITISH OZONE REVIEW

Item #d90aug60

The third report of the U.K. Stratospheric Ozone Review Group, released shortly before the London meeting on the Montreal Protocol, documents a long-term decline in winter ozone in the Northern Hemisphere. Stratospheric chlorine is expected to continue to increase to levels higher than previously experienced, possibly leading to disproportionately higher ozone losses due to chlorine's complicated relationship to ozone concentration, as illustrated by the development of the Antarctic ozone hole. The report questions the validity of the concept of ozone depletion potential used to establish protocol limits, arguing that the amount of chlorine in the atmosphere at any given time is important, not the lifetime of individual chlorine compounds. See Intl. Environ. Rptr. (pp. 275-276, June 1990) and New Scientist (p. 33, June 30).