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 7, NUMBER 8, AUGUST 1994
PROFESSIONAL PUBLICATIONS... OF GENERAL INTEREST: OZONE DEPLETION
Two items from Geophys. Res. Lett., 21(17),
Aug. 15, 1994:
"Recovery of Stratospheric Ozone over the United States
in the Winter of 1993-1994," D.J. Hofmann (CMDL, NOAA, 325
Broadway, Boulder CO 80303), S.J. Oltmans et al., 1779-1782.
Total ozone levels, which were 10-15% below normal over the U.S.
during the winter of 1992-93, were slightly above normal during
the winter of 1993-94. Measurements of aerosol particle surface
area suggest that the Mt. Pinatubo eruption caused a temporary
depletion of ozone through reactions with anthropogenic chlorine
on particle surfaces. Since that eruption was small in comparison
to historic eruptions, the potential for more severe reductions
in ozone over populated areas will be present well into the 21st
"Ozone Variations Related to Volcanic Activity and
Disappearance of SO2," V.C. Roldugin (Polar Geophys. Inst.,
Apatity, Murmansk Region, 184200, Russia), K. Henriksen,
1783-1786. Performed a trend analysis of total ozone data for
three regions of the USSR for the period 1973-1989. The
decreasing trends observed are almost entirely explained by
volcanic eruptions and the influence of decreasing SO2 on ozone
observations, leaving little or no evidence of ozone declines
from anthropogenic activity.
"An Investigation into the Sensitivity of the
Atmospheric Chlorine and Bromine Loading Using a Globally
Averaged Mass Balance Model," D.C. Dowdell (Dept. Environ.
Sci., Univ. Plymouth, Drake Circus, Plymouth, Devon PL4 8AA, UK),
G.P. Matthews, I. Wells, Atmos. Environ., 28(12),
1989-1999, July 1994.
Uses globally averaged mass balance models, which take into
account how halocarbons are used and how each use delays their
entrance to the atmosphere, to evaluate policy options regarding
the elimination of ozone-depleting substances. Under Montreal
Protocol 3, atmospheric chlorine will peak in 1994 but not return
to pre-ozone-hole levels until 2053. The introduction of
stringent policies for HCFC usage would reduce atmospheric
chlorine in the first half of the next century, but would have a
minimal effect on the latter date.
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Index of Abbreviations