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 2, FEBRUARY 1994
- OF GENERAL INTEREST: OZONE DEPLETION
Hydrofluorocarbons [HFCs] Destroy Stratospheric Ozone?" A.R.
Ravishankara (Aeronomy Lab., NOAA, 325 Broadway, Boulder CO
80303), A.A. Turnipseed et al., Science, 71(5143),
71-75, Jan. 7, 1994.
Some scientists have voiced concern that HFCs and even some
HCFCs, now gaining wide acceptance as substitutes for
chlorofluorocarbons (CFCs), may also be capable of destroying
stratospheric ozone. However, laboratory measurements of reaction
rates and subsequent modeling reported here confirm, for the
first time, that this is not the case.
1993 Ozone Decrease over the United States from Dobson
Spectrophotometer Observation," W.D. Komhyr (CIRES, Univ.
Colorado, Boulder CO 80309), R.D. Grass et al., Geophys. Res.
Lett., 21(3), 201-204, Feb. 1, 1993.
Observations, conducted since the 1960s at five locations and
since 1983 at one additional location, show an ozone decrease of
12.6% below the long-term normal during the winter and spring
months of 1993, implying a possible average increase in UV
erythemal radiation at that time of 16-25%. UV erythemal
radiation may have been 11-17% higher than normal at these
stations during the summer of 1993.
Cancer and UV Radiation," S. Madronich (NCAR, POB 3000,
Boulder CO 80307), F.R. de Gruijl, Nature, 366(6450),
23, Nov. 4, 1993.
Updates 1992 estimates of the increases in UV radiation doses
and skin cancer due to stratospheric ozone depletion, using new
satellite data and new data on skin cancer induction by UV
radiation. Compared to the first estimate, the high-latitude
trend toward increased cancer persists, and the uncertainty of
the estimate is considerably lower.
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