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Monthly mean spatial variations of dry deposition velocities of oxides of sulphur and nitrogen

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Abstract

Dry deposition processes play an important role in delivering acidic SOx and NOx to the surface. Modeled regional S and N budgets in North America indicate that about half of the total deposition is dry deposited. Thus, there is advantage to be gained in more accurately representing dry deposition in ‘acid deposition’ model calculations. A scheme, based on a resistance analogy, for estimating areal-average deposition velocities of gaseous and particulate oxides of S and N is used. From a literature review of observations, estimates of surface resistances for gases and near surface resistances for particles are obtained. Boundary layer theory and meteorological data are used to estimate aerodynamic resistances for gases and particulates as well as near surface resistance for gases. Coupled with information on land-use, monthly mean dry deposition velocity fields are obtained. This paper briefly reviews the parameterization schemes and the required data bases. It discusses spatial and temporal variation in dry deposition velocities of the oxides.

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Authors and Affiliations

  1. Environment Canada, 4905 Dufferin Street, M3H 5T4, Ontario, Canada

    E. C. Voldner & A. Sirois

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  1. E. C. Voldner
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  2. A. Sirois
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Voldner, E.C., Sirois, A. Monthly mean spatial variations of dry deposition velocities of oxides of sulphur and nitrogen. Water Air Soil Pollut 30, 179–186 (1986). https://doi.org/10.1007/BF00305187

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  • DOI: https://doi.org/10.1007/BF00305187

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