Growth of fluoroform (CHF3, HFC-23) in the background atmosphere

Details Growth of fluoroform (CHF3, HFC-23) in the background atmosphere Growth of fluoroform (CHF3, HFC-23) in the background atmosphere

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25...35o&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 1, p. 35-38

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12

Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Constituent Sources And Sinks

Scientific paper

There is growing concern over the emission and accumulation of very long-lived fluorinated trace gases in the atmosphere, due to their large global warming potentials (GWPs). Unlike CFCs and other ozone-depleting, chlorinated and brominated chemicals, consumption of these fluorinated compounds is not controlled by the Montreal Protocol or any other international agreement. Of all the known and potential trace `greenhouse' gases, the two with the highest GWPs are sulfur hexafluoride (SF6) and fluoroform (CHF3, HFC-23). Whereas several studies have reported the detection and accumulation of SF6 in the atmosphere, the presence of HFC-23 has remained unreported. We have found that present-day HFC-23 concentrations (c. 11 pptv in late 1995) exceed those of SF6 by a factor of three. Concentrations have steadily increased in the atmosphere since at least 1978, and are continuing to do so at a present rate of 5% per year. Furthermore, HFC-23 appears to be long-lived in the atmosphere, with a stratospheric lifetime of at least 1000 years, and a modelled tropospheric lifetime of 230 years. In terms of global warming, the cumulative emissions of HFC-23 up to, and including, 1995 are equivalent to 1.6 billion tonnes of CO2.

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