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    Global and regional models are important tools for understanding the impacts of sulfur dioxide emissions. Models of the sulfur cycle are now being integrated with atmospheric climate models in order to perform self-consistent calculations of sulfate loading, deposition and radiative forcing (e.g., Feichter et al., 1996, Roeckner et al., 1999, Barth et al., 2000).
    Author:Steven J Smith, Steven J Smith, Hugh Pitcher, T.M.L WigleyPublished:2001
  3. sciencedirect.com

    These workers measured sulphur emissions from land at 21 locations of different soil types in awide area of the north-eastern United States. Wide variation in sulphur flux was observed from the different soil types, together with variations of 10- to 100-fold with distances of 10 to 100m at the same sampling location.
    Author:Keith A. BrownPublished:1982
  4. sciencedirect.com

    Although wet S deposition differs considerably between the eastern and western regions of North America, for most of the continent, wet S deposition was lower than 6.0 kgS·ha −1 ·a −1, and most regions of Western Canada and the northern and western regions of the United States of America exhibited the same large areas of low wet S ...
    Author:Yang Gao, Mingzhen Ma, Tao Yang, Weiliang Chen, Tiantian YangPublished:2018
  5. sciencedirect.com

    Further from sources, the wet deposition of sulfate dominates the deposition processes, and routine measurements of sulfate in precipitation show downward trends across North America and Europe Hedin et al., 1994, Nilles and Conley, 2001, Tarrason and Schaug, 2000.Across Europe, the average sulfate concentration in rain has fallen more slowly than emissions, while in the United States, average ...
    Author:J.Neil Cape, David Fowler, Alan DavisonPublished:2003
  6. sciencedirect.com

    A global analysis of the changes since 1990 is beyond the scope of the present effort; however, it was possible to incorporate findings generated by regional assessments in North America and Europe. The 3-year averaging periods were selected to smooth the effects of interannual meteorological variability on the deposition data.
    Author:Robert Vet, Richard S. Artz, Silvina Carou, Mike Shaw, Chul-Un Ro, Wenche Aas, Alex Baker, Van C. Bo...Published:2014
  7. sciencedirect.com

    Range and mean values of sulphur emission reductions estimated by 5 LRT models for the 17 most important source regions and for Canada, the United States and N America. Emission reductions estimated by Monte Carlo model (arrows) are shown for comparison. these two models and the other five which may be resolved after further model development.
  8. sciencedirect.com

    Atmospheric sulfur budgets for the eastern United States, eastern Canada and eastern North America are formulated, based on the fluxes: natural and man-made emissions, wet and dry deposition and atmospheric inflows and outflows. ... Nitrogen, Phosphorus and Sulphur-Global CyclesB.H. Svensson, R. Soderlund (Eds.), SCOPE Rep. 7 (1976), pp. 89-134 ...
  9. sciencedirect.com

    This paper has four main objectives. The first is to develop and describe a spatially resolved model that can calculate geographically differentiated population intake fractions and toxicological impacts in a North American context, covering the following three spatial scales: direct surroundings (indoor or outdoor); local scale (urban or non-urban); and the regional scale (covering North ...
  10. sciencedirect.com

    Past acid deposition studies in North America have demonstrated that SO 2 and NO x emissions from Canada and the United States are transported across the Canada-United States border and deposited in the other country. In this study, we use an observation-based mass balance approach to estimate the percentage contribution of eastern US (EUS) emissions to wet deposition in eastern Canada (EC ...
  11. sciencedirect.com

    The model reproduces the variability of observed ammonium concentrations, both in an annual mean sense (R 2 = 0.88) and in different seasons (R 2 =0.82-0.85) with no apparent bias in an annual mean concentrations (slope=1.1).The R 2 values are consistent with those in the Park et al. (2004) simulation but the regression slopes are closer to unity because of the improved treatment of ammonia ...
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