Assessment of emissions data for the Toronto region using aircraft-based measurements and an air quality model |
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Authors: | D. A. Plummer J. C. McConnell L. Neary J. Kominski R. Benoit J. Drummond J. Narayan V. Young D. R. Hastie |
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Affiliation: | a Centre for Research in Earth and Space Science, York University, Toronto, Ont., Canada M3J 1P3;b Recherche en Prevision Numerique, Environment Canada, 2121 Trans-Canada N., Suite 564, Dorval, Quebec, Canada, H9P 1J3;c Unisearch Associates Inc., 96 Bradwick Dr., Concord, Ont., Canada L4K 1K8;d Centre for Atmospheric Chemistry, York University, Toronto, Ont., Canada M3J 1P3 |
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Abstract: | An aircraft-based measurement campaign was conducted during the summer of 1996 in the vicinity of Toronto, Canada. The objective of the campaign was to assess the errors in a particular emission inventory used by three-dimensional air quality models. Measurements of NO2 and hydrocarbons were made both upwind and downwind of Toronto, on days with strong synoptic-scale flow from a west to northerly direction. The chemical composition of the background airmass on these days was typical of unpolluted continental air. Measurements have been compared with the output from an on-line air quality model (MC2-AQ) run at 5 km resolution and suggest that emissions of NOx from Toronto are well described in the emission database, though evidence that NOx emissions are underestimated for suburban regions surrounding Toronto was found. In general, no significant underestimation of hydrocarbon emissions was found, though emissions of the model propane species, which includes acetylene and benzene, was underestimated by at least a factor of two. |
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Keywords: | Emission inventory Regional air quality Modelling Canada Ontario Toronto |
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