The Effect of Perturbation of the Total Ozone Column Due to CFC on the Spectral Distribution of UV Fluxes and the Damaging UV Doses at the Ocean Surface: A Model Study

Abstract

The amount of ozone in the atmosphere is a key factor in controlling the UV radiation reaching the earth’s surface. A reduction of the ozone layer due to anthropogenic release of chlorofluorocarbons (CFC) will therefore give rise to increased UV radiation. Based on our l-D model estimates of future ozone depletion by CFC’s, and on different action spectra for solar UV radiation, we will estimate the magnitude of the effect of possible future ozone depletions. In these estimates we utilize the detailed solar flux calculation which is included in the chemical model where ozone fluctuations are calculated (Isaksen and Stordal, 1981). The UV radiation model takes into account absorption by ozone and nitrogen dioxide. Rayleigh scattering and multiple scattering is modelled by assuming that half of the scattered light proceeds in the direction of the incoming radiation, the other half in the opposite direction.