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Tropospheric hydroxyl concentrations and the lifetimes of hydrochlorofluorocarbons (HCFCs)Three dimensional fields of modeled tropospheric OH concentrations are used to calculate lifetimes against destruction by OH for many hydrogenated halocarbons, including the CFC alternatives. The OH fields were taken from a 3-D chemical transport model (Spivakovsky et al. 1989) that accurately simulates the global measurements of methyl chloroform (derived lifetime of 5.5 years). The lifetimes of various hydro-halocarbons are shown to be insensitive to possible spatial variations and seasonal cycles. It is possible to scale the HCFC lifetimes to that of methyl chloroform or methane by using the ratio of the rate coefficients for reaction with OH at an appropriate temperature, about 277 K.
Document ID
19920006222
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Prather, Michael J. (NASA Goddard Inst. for Space Studies New York, NY, United States)
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
92N15440
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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