Potential Sources of Pesticides, PCBs, and PAHs to the Atmosphere of the Great Lakes

• Published in: Environmental science & technology 2003-09, Vol.37 (17), p.3764-3773
• Main Authors: Hafner, William D, Hites, Ronald A
• Format: Article
• Language: English
• Subjects: Air Movements; Air Pollutants - analysis; Applied sciences; Atmosphere; Atmospheric pollution; Environmental Monitoring; Environmental Pollutants - analysis; Exact sciences and technology; Freshwater; Great Lakes Region; Lakes; Models, Statistical; PCB; Pesticides; Pesticides - analysis; Pollutants physicochemistry study: properties, effects, reactions, transport and distribution; Pollution; Polychlorinated biphenyls; Polychlorinated Biphenyls - analysis; Polycyclic Aromatic Hydrocarbons - analysis
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es034021f

A probabilistic model called the potential source contribution function (PSCF) has been used to estimate atmospheric source regions of polycyclic aromatic hydrocarbons (PAHs), chlorinated pesticides, and polychlorinated biphenyls (PCBs) to the Great Lakes. This model allows us to map each compound's source region on a 0.5° × 0.5° latitude/longitude grid centered over the Great Lakes basin. PCBs primarily have urban sources, the strengths of which vary. Like PCBs, PAHs show a strong urban signature, but these compounds also seem to come from rural sites. The source regions of PAH become less distinct as the molecular weight of the compound increases. Since reactivity increases with PAH size, this diminishing trend may be an indication that atmospheric degradation plays a large role in PAH transport. The pesticides have the strongest source regions and are typically transported the farthest, often from areas distant from the Great Lakes basin.