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 2, NUMBER 5, MAY 1989
ULTRAVIOLET INCREASE MEASURED IN ANTARCTIC
Late last year American
researchers for the first time measured increased levels of ultraviolet
radiation corresponding to the decreased levels of stratospheric ozone observed
in the Antarctic spring. Although ultraviolet measurements were not made during
the most intense ozone hole observed so far in the Antarctic spring of 1987,
based on the 1988 data ultraviolet levels were five times as high as normal
then, and twice as high as the normal summer maximum. Research by Scripps
Institution of Oceanography's Osmund Holm-Hansen leads him to conclude that
increased ultraviolet does not pose a significant threat to the phytoplankton in
Antarctic ocean waters, an important part of the food chain. Other researchers
are less confident of this conclusion. See Science, pp. 288-289, Apr.
21, 1989; New Scientist, p. 18, Apr. 15.
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