February 28, 2007
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A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 3, NUMBER 5, MAY 1990
ARCTIC OZONE RESULTS ARE IN
Final analysis of data collected in the
Airborne Arctic Stratospheric Expedition, during January and February of 1989,
is complete and has been published as a collection of papers in a special issue
of Geophysical Research Letters (Vol. 17, No. 4, 1990). Results provide
strong evidence that the same chemical and physical processes involving
anthropogenic chlorofluorocarbons that were found to account for the Antarctic
ozone hole also operate in the Northern Hemisphere's polar stratosphere. These
processes are most efficient when the air is very cold in the presence of
sunlight. No drastic loss of Arctic ozone has yet been detected because the
Arctic stratosphere does not get as cold as the Antarctic and the cold
air tends to warm rapidly as daylight returns in spring. However, the expedition
found ozone losses of 10-20 percent from destruction by chlorine compounds, and
an unusually cold Arctic winter could lead to much greater ozone depletion.
For further discussion of the findings see Chem. Eng. News, pp.
22-23, Mar. 19, 1990; Science, p. 1297, Mar. 16; New Scientist,
p. 23, Apr. 14; Science News, p. 183, Mar. 24; Intl. Environ. Rptr.,
p. 145, Apr.
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