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 9, SEPTEMBER 1993
GENERAL INTEREST--SCIENCE: OZONE DEPLETION AND UV-B
"Record Low Total Ozone During Northern Winters of 1992 and
1993," R.D. Bojkov (World Meteor. Org., POB 5, CH-1211
Geneva 20, Switz.), C.S. Zerefos et al., Geophys. Res. Lett., 20(13),
1351-1354, July 9, 1993.
The last two winter-spring seasons had the lowest ever total
ozone over the regions of North America, Europe and Siberia
between 45ĚN and 65ĚN. Ozone was 11-13% below the long-term
average, bringing the cumulative ozone decline in that latitude
belt since the winter/spring of 1969/70 to about 14%. Possible
chemical and dynamical contributions to the low levels are
"What-Ifs for a Northern Ozone Hole," A. Newman, Environ.
Sci. Technol., 27(8), 1488-1491, Aug. 1993.
A summary of several intriguing possibilities that could lead
to further significant ozone losses, particularly in a
greenhouse-warmed world, from a feature lecture by J.D. Mahlman
at the latest American Geophysical Union meeting.
"Solar Ultraviolet Irradiance Observed from Southern
Argentina: September 1990 to March 1991," J.E. Frederick
(Dept. Geophys. Sci., Univ. Chicago, Chicago IL 60637), P.F.
Soulen et al., J. Geophys. Res., 98(D5), 8891-8897,
May 20, 1993.
Observations at a populated region (latitude 55ĚS) extended
through a season of prolonged depletion in column ozone over
Antarctica. After removing the effect of clouds, irradiance at
wavelengths between 300 and 310 nm was enhanced up to 45% at noon
during December relative to clear sky calculations based on ozone
climatology. (See research News.)
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