Non-linear response of wet deposition to emissions reduction: A model study |
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| Institution: | 1. Department of Mechanical Power Engineering, Faculty of Engineering, AL-Azhar University, Nasr City, Cairo 11371, Egypt;2. Nuclear Power Plants Authority, 4 El-Nasr Avenue, P.O. Box 8191, Nasr City, Cairo 11371, Egypt;1. Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK;2. Centre for Process Integration, School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, UK |
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| Abstract: | An Eulerian atmospheric model with complex chemistry (Acidic Deposition and Oxidant Model) and a Lagrangian model with linear chemistry (Ontario Ministry of the Environment Trajectory Model) were used to simulate the wet SO42? deposition pattern over eastern North America for 16 days during April 1981.The two model results agree reasonably well with each other when the 16 day average values are compared. They also show reasonable agreement with observed data. Having established the ability of the models to predict deposition patterns for 1981 emissions, reduction scenarios with 50% SOx and 50% SOx and NOx of the 1981 emissions were studied through the Eulerian model. Near the heavy emissions area, the reduction in SO42? wet deposition is only about 30–40%. In this respect the linear Lagrangian model departs significantly from the Eulerian model. This non-linearity in response is attributed to the role of oxidants in controlling the conversion of SO2 to SO42?. |
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