Testing a Statistical Long-Range Transport Model on European and North American Observations
A statistical long-range transport model of sulphur oxides was applied to Europe and compared with observations of SO2 and sulphate in air and the wet deposition of sulphate. A sensitivity analysis indicated that SO2 wet removal is an efficient process and SO2 oxidation in dry conditions is generally slow. The model was then applied to North America and the same choice of parameter values describing the main removal processes gives acceptable agreement in spite of the markedly different source density. This is evidence that the total sulphur system contains two components one of which depends roughly linearly on source strength and one related to a background concentration of sulphate in precipitation which is not directly related to sources within the regions modelled. Source-receptor matrices for both regions are presented and show that the background can be important at receptors remote from major emissions in areas of high precipitation.
KeywordsDeposition Velocity Sulphur Deposition Grid Area High Deposition Velocity Rain System
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