Effect of clouds on photolysis rates at the surface: A practical method of estimation and its application to a modeling study of the formation of photochemical oxidants |
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| Institution: | 1. Laboratoire de Cinétique et Chimie de la Combustion, Université des Sciences et Techniques de Lille, Flandres-Artois, 59655-Villeneuve d''Ascq, France;2. Ecole Nationale Supériure des Techniques Industrielles et des Mines, 59500-Douai, France;1. Department of Dermatology, University of Michigan, Ann Arbor, Michigan;2. Department of Dermatology, Johns Hopkins University, Baltimore, Maryland;1. School of Medicine, Western Sydney University, New South Wales;1. C-MADE, School of Science and Technology, University of Trás-os-Montes e Alto, Douro 5000-801, Vila Real, Portugal;2. ISISE, Department of Civil Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;3. Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal |
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| Abstract: | Up to now, theoretical parametrization of the influence of clouds on photolytic reactions still meets with difficulties. Thus we developed a practical method relying on measurements of the u.v. flux compared to that expected for cloudless conditions, over a diurnal range, on successive days. The impact of the depletion in the photolytic constants, varying according to five different groups of reactions, has been estimated by a simulation of photochemical smog with various chemical mechanisms. Under current weather conditions, the ozone and PAN decreases varied from 11 to 20%; on the contrary NO2 and HNO2 were found to increase. Limitations of the method are discussed. |
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