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Relative effects on stratospheric ozone of halogenated methanes and ethanes of social and industrial interestFour atmospheric modeling groups have calculated relative effects of several halocarbons (chlorofluorocarbons (CFC's)-11, 12, 113, 114, and 115; hydrochlorofluorocarbons (HCFC's) 22, 123, 124, 141b, and 142b; hydrofluorocarbons (HFC's) 125, 134a, 143a, and 152a, carbon tetrachloride; and methyl chloroform) on stratospheric ozone. Effects on stratospheric ozone were calculated for each compound and normalized relative to the effect of CFC-11. These models include the representations for homogeneous physical and chemical processes in the middle atmosphere but do no account for either heterogeneous chemistry or polar dynamics which are important in the spring time loss of ozone over Antarctica. Relative calculated effects using a range of models compare reasonably well. Within the limits of the uncertainties of these model results, compounds now under consideration as functional replacements for fully halogenated compounds have modeled stratospheric ozone reductions of 10 percent or less of that of CFC-11. Sensitivity analyses examined the sensitivity of relative calculated effects to levels of other trace gases, assumed transport in the models, and latitudinal and seasonal local dependencies. Relative effects on polar ozone are discussed in the context of evolving information on the special processes affecting ozone, especially during polar winter-springtime. Lastly, the time dependency of relative effects were calculated.
Document ID
19920006228
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Fisher, Donald A. (Du Pont de Nemours (E. I.) and Co. Wilmington, DE., United States)
Hales, Charles H. (Du Pont de Nemours (E. I.) and Co. Wilmington, DE., United States)
Filkin, David L. (Du Pont de Nemours (E. I.) and Co. Wilmington, DE., United States)
Ko, Malcolm K. W. (Atmospheric and Environmental Research, Inc., Pasadena CA., United States)
Sze, N. Dak (Atmospheric and Environmental Research, Inc., Pasadena CA., United States)
Connell, Peter S. (Lawrence Livermore National Lab. CA., United States)
Wuebbles, Donald J. (Lawrence Livermore National Lab. CA., United States)
Isaksen, Ivar S. A. (Oslo Univ. (Norway).)
Stordal, Frode (Oslo Univ.)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Publication Information
Publication: NASA, Washington, Scientific Assessment of Stratospheric Ozone: 1989, Volume 2. Appendix: AFEAS Report
Subject Category
Environment Pollution
Accession Number
92N15446
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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