♦MODELLING ATMOSPHERIC TRANSMITTANCE OF UV RADIATION 



ALEX E.S. GREEN 



ICAAS-SSRB 

 University of Florida 

 Gainsville, FL 32611 



♦Abstract taken from Green, A.E.S., 1983. 

 radiation to the ground. Physiol. Plant. 



The penetration of ultraviolet 

 58: 351-359. 



ABSTRACT: The evolution of analytic formulas for characterizing the ultraviolet 

 spectral irradiance penetrating to the ground is briefly described. Analytic 

 spectral functions for the extraterrestrial solar spectral irradiance, the ozone 

 absorption coefficients, Rayleigh scattering coefficients and aerosol scattering 

 and absorption coefficients, which are used as basic inputs, are given. With 

 Beer's law, these give immediately the direct solar spectral irradiance. A 

 ratio technique described in quantitative detail gives a procedure for 

 calculating the skylight component of the UV radiation reaching the ground. The 

 influence of ground reflectivity, clouds and a possible connection between 

 photobiology and radiological physics are discussed. Finally the advantages of 

 multiwavelength monitoring are described, using monochromators similar to those 

 used in satellite ozone sounding to serve the needs of the photobiology and the 

 atmospheric science communities. 



REFERENCES: 



Bjorn, L.O. and T.M. Murphy, 1985. Computer calculation of solar ultraviolet 

 radiation at ground level. Physiol. Veq. 23(5): 555-561. 



Dave, J.V. and P. Halpern, 1976. Effect of changes in ozone amount on the 

 ultraviolet radiation received at sea level of a model atmosphere. Atmos. 

 Environ. 10: 547-555. 



Green, A.E.S., 1966. The Middle Ultraviolet: Its Science and Technology. Wiley, 

 New York, 371 pp. 



Green, A.E.S., 1983. The penetration of ultraviolet radiation to the ground. 

 Physiol. Plant. 58: 351-359. 



Green, A.E.S., K.R. Cross and L.A. Smith, 1980. Improved analytic 

 characterization of ultraviolet skylight. Photochem. Photobiol. 31: 59-65. 



Green, A.E.S., T. Sawada and E.P. Shettle, 1974. The middle ultraviolet reaching 

 the ground. Photochem. Photobiol. 19: 251-259. 



Nack, M.L. and A. E.S. Green, 1974. Influence of clouds, haze, and smog on the 

 middle ultraviolet reaching the ground. Appl . Opt. 13: 2405-2415. 



Schippnick, P.F. and A. E.S. Green, 1982. Analytical characterization of spectral 

 actinic flux and spectral irradiance in the middle ultraviolet. Photochem. 

 Photobiol. 35: 89-101. 



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