Herman, JayMentall, J. E.2023-07-062023-07-061985-10Herman, Jay and J. E. Mentall. "Photolysis rates based on Schumann-Runge band approximations and irradiance measurements." Geophysical Research Letters 12, no. 10 (October 1985): 659-662. https://doi.org/10.1029/GL012i010p00659.https://doi.org/10.1029/GL012i010p00659http://hdl.handle.net/11603/28422The photolysis rate (J₃) for CF₂Cℓ₂, (F-12) in the stratosphere has been computed for three altitudes using measured solar fluxes from a balloon borne spectrometer. The rate is compared with that obtained by computing the attenuated flux using effective cross sections appropriate for the Schumann-Runge bands (J₁) [Allen and Frederick, 1982]. The result shows that the error in the F-12 photolysis rate caused by using the Allen and Frederick approximation is about 10% (J₁ < J₃) for altitudes between 32 and 38 km with solar zenith angles less than about 62 degrees. For species other than O₂, this implies that the discrepancy in photolysis rates associated with the Schumann-Runge band approximations are not likely to be important. Within the Schumann-Runge band region the computed errors for F-12 photolysis are about 10.5% at 38.13 km and increase with decreasing altitude. If this error applies to O₂ photolysis, there may be the possibility of an incorrect calculation of net odd oxygen production in photochemical models.4 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domain Mark 1.0http://creativecommons.org/publicdomain/mark/1.0/Text