Source-Receptor Relationships for Acid Deposition: Pure and Simple

TL;DRAbstract

The status of technology for determining the contribution of source emissions to the deposition of acidifying substances at receptors in eastern North America is discussed. Two basic approaches are available for source apportionment. These involve: the interpretation of direct measurement, or the application of theoretically based models accounting for material balance of the acidifiers. The use of direct measurements requires at a minimum either detailed spatial observations or long term historical data taken at sites located in different areas. Analysis of observations to date gives qualitative information about deposition patterns in relation to source regions for sulfur and nitrogen oxides. The analysis of data is enhanced with application of empirical models. Quantitative source apportionment is not possible solely from the measurements; a verified theoretically based model is needed to complete this type of assessment. The current technology of modeling permits estimation of sour

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