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 9, SEPTEMBER 1996
OZONE DEPLETION: CFC SUBSTITUTES
Trifluoroacetate [TFA]," H. Frank (Dept. Environ. Chem., Univ. Bayreuth,
D-95440 Bayreuth, Ger.), A. Klein, D. Renschen,
Nature, 382(6586), 34, July 4, 1996.
HFC 134a is one of the most important alternatives to CFCs. Its expected
annual production by the year 2010 is 230,000 metric tons, 30-40% of which will
be oxidized in the atmosphere to TFA. It has been assumed that there is
presently no TFA in the environment. However, air and water samples collected in
Germany, Switzerland and Israel already contain TFA from other sources, in the
range predicted for 2010 that would result from HFC 134a alone.
Tropospheric Growth Rate and Distribution of HFC-134a (CF3CH1F)," D.E. Oram
(School Environ. Sci., Univ. E. Anglia, Norwich NR4 7TJ, UK (tel: 603 593176;
fax: 603 250588), W.T. Sturges et al., Geophys. Res. Lett., 23(15),
1949-1952, July 15, 1996.
Presents analyses of this CFC replacement in air samples collected at Cape
Grim, Tasmania (1978-1995) and Mace Head, Ireland (1994-1995). Until 1980, the
concentration at Cape Grim was below detectable limits. Between 1992 and
mid-1995, the concentration grew exponentially, reaching 0.43 pptv at the end of
1994. In the absence of industrial production and release estimates for
HFC-134a, the observations were used in conjunction with a 2-D global model to
estimate that significant emissions (250 tons) began in 1991, and increased
rapidly to about 8 ktons in 1994.
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