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Measurement of tropospheric 300 nm solar ultraviolet flux for determination of O/1D/ photoproduction rateThe tropospheric importance of the OH radical, and the reaction scheme that leads to its formation, are now being widely investigated. Ozone photolysis at wavelengths no greater than 318 nm produces O(1D), a small fraction of which then reacts with water vapor to yield OH. Although experimental data are available for the O(1D) quantum yield, as well as the O3 absorption cross section, all previous tropospheric photochemical models have had to use theoretical calculations to determine the UV flux. Discussed in this paper are aircraft spectral measurements of the solar UV flux at two altitudes - 2 and 6 km. These results have been compared with three theoretical approaches. The measured experimental fluxes have been combined here with recent quantum yield data to calculate the O(1D) photoproduction rate for various albedo values. This rate is larger than that used in models by about a factor of 2 for reasonable values of assumed albedo.
Document ID
19780054926
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sellers, B.
(Parametrics, Inc. Waltham, MA, United States)
Hanser, F. A.
(Parametrics, Inc. Waltham, Mass., United States)
Date Acquired
August 9, 2013
Publication Date
May 1, 1978
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 35
Subject Category
Geophysics
Accession Number
78A38835
Funding Number(s)
CONTRACT_GRANT: NSF ENV-76-23902
CONTRACT_GRANT: NAS3-20472
CONTRACT_GRANT: N00014-73-C-0316
Distribution Limits
Public
Copyright
Other

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