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Comparison of stratospheric ozone destruction by fluorocarbons 11, 12, 21, and 22Measured photoabsorption cross sections for fluorocarbons (FC) 11, 12, 21, and 22 are presented for the wavelength region from 1740 A to about 2200 A. Solar radiation in this region dissociates these molecules in the stratosphere releasing atomic chlorine which participates in catalytic reactions that destroy ozone. Photolysis by solar UV is the only known loss mechanism for FC11 and FC12. However, FC21, and FC22 also react with OH in the troposphere reducing the amount of ground level releases which reach the stratosphere. Calculations comparing the steady state stratospheric C1X due to equal release rates of fluorocarbons 11, 12, 21, and 22 are presented using a range of OH profiles and eddy diffusion coefficients. These calculations indicate approximately a factor of 20 to 450 less C1X in the stratosphere for FC21 and a factor of 40 to 130 for FC22, compared to an equal release rate of FC11 and FC12.
Document ID
19770029256
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Robbins, D. E.
(NASA Johnson Space Center Houston, Tex., United States)
Stolarski, R. S.
(NASA Goddard Space Flight Center Laboratory for Planetary Atmospheres, Greenbelt, Md., United States)
Date Acquired
August 8, 2013
Publication Date
October 1, 1976
Publication Information
Publication: Geophysical Research Letters
Volume: 3
Subject Category
Environment Pollution
Accession Number
77A12108
Distribution Limits
Public
Copyright
Other

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