February 28, 2007
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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
BRITISH OZONE REVIEW
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).
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