Atmospheric Lifetimes of Halogenated Hydrocarbons: Improved Estimations From an Analysis of Modeling Results

Detailed results of computer modeling of halocarbon removal rates from the atmosphere are analyzed to find simple correlations useful for improving estimations of the atmospheric lifetimes of industrial chemicals based on the rate constants for their reactions with OH and O(1D) and their UV absorpti...

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Bibliographic Details
Published in:Journal of geophysical research. Atmospheres 2020-08, Vol.125 (16), p.n/a
Main Authors: Orkin, Vladimir L., Kurylo, Michael J., Fleming, Eric L.
Format: Article
Language:English
Subjects:
Absorption spectra
atmospheric lifetime
Atmospheric models
CFC
Constants
Correlation analysis
Geophysics
Halogenated hydrocarbons
Halogenation
HCFC
HFC
hydroxyl
methyl chloroform
Modelling
Rate constants
Troposphere
Ultraviolet absorption
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Summary:Detailed results of computer modeling of halocarbon removal rates from the atmosphere are analyzed to find simple correlations useful for improving estimations of the atmospheric lifetimes of industrial chemicals based on the rate constants for their reactions with OH and O(1D) and their UV absorption spectra. This analysis is limited to relatively long‐lived chemicals that are well mixed in the troposphere. Key Points A new semiempirical approach is developed for obtaining total atmospheric lifetimes of halocarbons from their photochemical properties The new approach yields partial lifetimes for methyl chloroform of 6.0 years for OH reaction and 48 years for stratospheric photolysis The methyl chloroform scaling approach is shown to yield total (rather than tropospheric) lifetime estimates for long‐lived halocarbons
ISSN:2169-897X
2169-8996
DOI:10.1029/2019JD032243