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 12, DECEMBER 1993
ULTRAVIOLET INCREASE OBSERVED
Canadian scientists have published
the first strong evidence that decreasing levels of stratospheric ozone are
causing the intensity of ultraviolet radiation to increase at the Earth's
surface in middle latitudes. (See: "Evidence for Large Upward Trends of Ultraviolet-B Radiation Linked
to Ozone Depletion," J.B. Kerr, C.T. McElroy, Science, 262(5136),
1032-1034, Nov. 12, 1993). The measurements were made in such a way that the
complicating influences of clouds and low-level atmospheric pollution were
A news report in the same issue of Science (pp. 990-991) explains
how this finding addresses an argument used by a small, vocal group of
dissenters on the ozone problem. Previously, there had been no evidence that
ultraviolet radiation has increased at the Earth's surface in response to the
long-term decrease in ozone levels observed at temperate latitudes.
The U.S. Environmental Protection Agency and National Weather Service have
been developing a program to monitor trends in surface ultraviolet radiation,
and inform the public daily of potential health risks from exposure. The program
will be modeled after one started in Canada in 1992. Modifications, such as the
manner of communicating information to the public, are still being developed.
(See Chem. Eng. News, pp. 7-8, Nov. 29 1993).
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