Other
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.337..535r&link_type=abstract
Nature, Volume 337, Issue 6207, pp. 535-537 (1989).
Other
13
Scientific paper
Concern that emissions of fully halogenated hydrocarbons may deplete stratospheric ozone through chlorine-catalysed destruction1-3 has prompted a search for safer chemicals. CHCIF2 (CFC-22) is a promising substitute as it contains only a single chlorine atom and is partially removed in the troposphere by reactions with hydroxyl radicals (OH) 4. Recognizing these facts, CFC-22 has been excluded from the controls under the Montreal Protocol29. The possibility of rapidly increasing use of CFC-22 suggests a need for careful atmospheric monitoring, especially as the atmospheric lifetime of CFC-22 is long but uncertain (12-28 yr (refs 3, 5)) and absorption by the strong CFC-22 infrared bands could contribute to greenhouse warming6,7. Here we report atmospheric CFC-22 measurements derived from ground-based solar spectra recorded between December 1980 and May 1988 which show that the CFC-22 total column increased at an average annual exponential rate of 7.8% +/- 1.0% (2σ). Compared with other atmospheric data, these measurements indicate that CFC-22 is increasing at a more rapid rate than either CFC-11 or CFC-12, the two most abundant chlorofluorocarbons, but that the rate of CFC-22 increase is likely to have declined over the past few years.
Goldman Aaron
Johnson Douglas W.
Levine Joel S.
Rinsland Curtis P.
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