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Effective Photodissociation Cross Sections for Molecular Oxygen and Nitric Oxide in the Schumann-Runge Bands

Allen, Mark and Frederick, John E. (1982) Effective Photodissociation Cross Sections for Molecular Oxygen and Nitric Oxide in the Schumann-Runge Bands. Journal of the Atmospheric Sciences, 39 (9). pp. 2066-2075. ISSN 0022-4928. doi:10.1175/1520-0469(1982)039<2066:EPCSFM>2.0.CO;2.

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Simple polynomial representations of the altitude and zenith angle dependence of effective photodissociation cross sections for molecular oxygen and nitric oxide in the Schumann-Runge band region are presented. Longward of ∼202 nm, the atmosphere is optically thin and the effective cross sections are well correlated with local temperature. Atmospheric transmission values and O2 and NO photodissociation rates calculated using the parameterized effective cross sections are in good agreement with the results of the high spectral resolution computations of Frederick and Hudson. The effective cross section approach allows the use of different solar spectra and avoids the assumption of previous work that ray paths at different solar zenith angles, but with the same O2 absorbing column, have the same opacity and dissociation rates. The errors resulting from this assumption can exceed 20% at optical depths greater than 2.

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Additional Information:© 1982 American Meteorological Society. Manuscript received September 22, 1981, in final form June 7, 1982. We thank Y. L. Yung and L. Froidevaux for their helpful comments. This research was supported by JPL 49-649-20320-0-3270 to the California Institute of Technology. Contribution number 3621 of the Division of Geological and Planetary Sciences, California Institute of Technology.
Issue or Number:9
Record Number:CaltechAUTHORS:ALLjas82
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6604
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Deposited On:14 Dec 2006
Last Modified:08 Nov 2021 20:35

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