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A two-dimensional photochemical model of the atmosphere. I Chlorocarbon emissions and their effect on stratospheric ozoneA two-dimensional photochemical model is used to examine changes to the ozone layer caused by emissions of CFCl3, CF2Cl2, CH3CCl3 and CCl4. The influence of a possible secular increase in tropospheric methane up to 2 percent per year was found to be small, although it acts to mask decreases in total ozone caused by the chlorocarbons. Increasing NO(x) emissions caused by industralization also tend to mask decreases in total ozone and may have caused total ozone to increase by about 1 percent. The model-calculated ozone decreases are estimated to be about 3 percent by 1980. This estimate is higher than estimates by similar models, although it is noted that CCl4 and CH3CCl3 emissions are included in the model in addition to CFCl3 and CF2Cl2. This is significant because the model indicates that CCl4 has dominated the ozone depletions so far, and knowledge of the historical emission rate of CCl4 to the atmosphere is incomplete. There remain sufficient significant disagreements between theoretical and observed concentrations and variabilities, particularly for odd nitrogen and ClO, to caution against assigning too much confidence in the calculated ozone depletion.
Document ID
19830061627
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gidel, L. T.
(Miami, University Miami, FL, United States)
Crutzen, P. J.
(Max-Planck-Institut fuer Chemie Mainz, Germany)
Fishman, J.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 11, 2013
Publication Date
August 20, 1983
Publication Information
Publication: Journal of Geophysical Research
Volume: 88
ISSN: 0148-0227
Subject Category
Environment Pollution
Accession Number
83A42845
Distribution Limits
Public
Copyright
Other

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