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 6, NUMBER 11, NOVEMBER 1993
Several types of
measurements by different groups in October point to record low amounts of
stratospheric ozone in this year's Antarctic ozone hole. Although atmospheric
levels of anthropogenic chlorine are continuing to increase, the 1993 ozone
depletion is probably more a result of unusual weather conditions. The record
low temperatures observed this year are favorable for the formation of polar
stratospheric cloud particles, on which ozone-destroying reactions take place.
Lingering particles from the Mount Pinatubo eruption may also be a factor.
See Nature, p. 683, Oct. 21 1993; Science, p. 501, Oct. 22
1993; Global Environ. Change Rep., p. 5, Oct. 22 1993 and p. 4, Nov. 12
1993. Antarctic ozone as well as the unprecedented low levels observed over the
U.S., mentioned briefly in Global Climate Change Digest last month, are
discussed in Chem. Eng. News, p. 5, Oct. 4 1993.
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