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 5, MAY 1993
NORTHERN HEMISPHERE STRATOSPHERIC OZONE
Hemisphere Stratospheric ozone dropped more than 20 percent below
the long-term normal levels over most of Europe during February,
reaching a record low level, according to the World
Meteorological Organization. Levels were 9 to 20 percent below
average in the middle- and high-latitudes of the Northern
Hemisphere during December, January and February, making this the
second winter in a row to experience very low ozone levels.
Atmospheric scientist Rumen Bojkov of WMO believes that
anthropogenic chemicals caused much of the ozone reduction,
although other factors such as atmospheric motions are involved.
This destruction would be consistent with measurements of
ozone-destroying chemicals by the Upper Atmosphere Research
Satellite (UARS), and with predictions made last year of the
potential for severe ozone loss over the Northern Hemisphere,
according to NASA scientists quoted in Science News (pp.
180-181, Mar. 20). However, Bojkov emphasized that there is no
ozone hole over the northern latitudes, contrary to reports that
appeared recently in German, Dutch and Danish newspapers. Ozone
concentrations normally increase in winter; they just didn't
increase as much as usual this past winter.
See also Intl. Environ. Rptr., p. 246, Apr. 7 1993, and
p. 156, Mar. 10 1993; Global Environ. Change Rep., p. 6,
Mar. 26 1993.
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