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Iodine - Its possible role in tropospheric photochemistryA detailed study of the photochemistry of iodine and its oxides indicates that iodine species may play an important role in the tropospheric photochemical system. Methyl iodide, often observed in the marine troposphere with an average concentration of 5-10 ppt, is photolyzed and thereby produces I atoms. Chemical interactions with O3, HxOy, and NOx cause I to be converted to other inorganic compounds such as IO, HOI, IONO2, and I2. The production of these species and their subsequent recycling back to I can lead to the catalytic removal of tropospheric O3, the enhancement of the NO2/NO ratio, the destruction of HxOy free radicals, and the conversion of HO2 to OH. Ultimately, tropospheric inorganic iodine is removed by heterogeneous processes. Calculations using a numerical model to simulate tropospheric photochemistry indicate that iodine may have a strong impact upon the atmospheric O3-NOx-HxOy system. The magnitude of these effects is dependent upon the value of several uncertain rate constants and the primary source distributions of CH3I and other organic and inorganic iodine compounds.
Document ID
19810033754
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chameides, W. L.
(Florida, University Gainesville, Fla., United States)
Davis, D. D.
(Georgia Institute of Technology Atlanta, Ga., United States)
Date Acquired
August 11, 2013
Publication Date
December 20, 1980
Publication Information
Publication: Journal of Geophysical Research
Volume: 85
Subject Category
Geophysics
Accession Number
81A18158
Funding Number(s)
CONTRACT_GRANT: NSG-1600
CONTRACT_GRANT: NSF ATM-76-81487
CONTRACT_GRANT: NSF ATM-78-23598
CONTRACT_GRANT: NSF ATM-77-20179
Distribution Limits
Public
Copyright
Other

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