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 9, NUMBER 5, MAY 1996
OZONE DEPLETION: UV RADIATION
"The Effect of Volcanic Aerosols on Ultraviolet Radiation in
Antarctica," S.R. Tsitas (Div. Geol. & Planet. Sci. 170-25, California
Inst. Technol., Pasadena CA 91125), Y.L. Yung, Geophys. Res. Lett., 23(2),
157-160, Jan. 15, 1996.
At large solar zenith angles, volcanic aerosols can have the surprising
effect of increasing the flux of UV-B reaching the surface, because of
scattering. This paper provides the first rigorous and complete explanation of
how this occurs, and how it is important in the Antarctic spring because of the
combined effects of the spring ozone hole and the large zenith angles at that
time of year.
"Atmospheric Ozone Trends and Other Factors of Surface Ultraviolet
Radiation Variability," K.Y. Kondratyev (Ctr. Ecol. Safety, Russian Acad.
Sci., 18 Korpusnaya St., 197042 St. Petersburg, Russia), O.M. Pokrovsky, C.A.
Varotsos, Environ. Conserv., 22(3), 259-261, Autumn 1995.
Surveys the potential effects of total ozone variability and related UV-B
radiation changes, with the ultimate goal of medium-range prediction of both
quantities by, for instance, statistical techniques. Summarizes research needed
to achieve this goal.
"Consequences of Climate Warming and Lake Acidification for UV-B
Penetration in North American Boreal Lakes," D.W. Schindler (Dept. Biol.
Sci., Univ. Alberta, Edmonton AB T6G 2E9, Can.), P.J. Curtis et al., Nature,
379(6567), 705-707, Feb. 22, 1996.
Observations from 20 years of whole-lake acidification experiments in
northwestern Ontario show that climate warming and lake acidification both lead
to declines in the dissolved organic content of lake waters, allowing increased
penetration of solar radiation. Some changes in aquatic ecosystems that have
been attributed to lake acidification may in fact have involved increased
exposure to UV light. In clear, shallow waters, climate warming and/or
acidification can be more effective than stratospheric ozone depletion in
raising the exposure of aquatic organisms to biologically effective UV
"Ozone Depletion: A View from the Grass Roots," N.D. Paul
(Inst. Environ. & Biol. Sci., Lancaster Univ., Lancaster LA1 4YQ, UK), Atmos.
Environ., 30(14), i-ii, July 1996. (A contribution to the journal's "New
Directions" section. Submissions, 1000 words or less, can be e-mailed to
A biologist decries the lack of understanding of the ecological effects of
increased levels of UV-B. Without such information, how can scientists hope to
continue to convince legislators (or themselves) that the only safe option is
the no-risk strategy of phasing out ozone-depleting substances?
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