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Global Climate Change DigestArchives of the
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

PROFESSIONAL PUBLICATIONS...
OZONE DEPLETION: CFC SUBSTITUTES


Item #d96sep45

"Environmental 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.


Item #d96sep46

"Recent 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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