title: Assessing Model Characterization of Single Source Secondary Pollutant Impacts Using 2013 SENEX Field Study Measurements.
abstract: Aircraft measurements made downwind from specific coal fired power plants during the 2013 Southeast Nexus field campaign provide a unique opportunity to evaluate single source photochemical model predictions of both O3and secondary PM2.5species. The model did well at predicting downwind plume placement. The model shows similar patterns of an increasing fraction of PM2.5sulfate ion to the sum of SO2and PM2.5sulfate ion by distance from the source compared with ambient based estimates. The model was less consistent in capturing downwind ambient based trends in conversion of NOXto NOYfrom these sources. Source sensitivity approaches capture near-source O3titration by fresh NO emissions, in particular subgrid plume treatment. However, capturing this near-source chemical feature did not translate into better downwind peak estimates of single source O3impacts. The model estimated O3production from these sources but often was lower than ambient based source production. The downwind transect ambient measurements, in particular secondary PM2.5and O3, have some level of contribution from other sources which makes direct comparison with model source contribution challenging. Model source attribution results suggest contribution to secondary pollutants from multiple sources even where primary pollutants indicate the presence of a single source.
authors.affiliation: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards 109 TW Alexander Dr., Research Triangle Park, North Carolina 27711, United States.
authors.forename: Kirk R
authors.identifier: 0000-0003-4417-6799
authors.initials: KR
authors.lastname: Baker
authors.affiliation: U.S. Environmental Protection Agency, Office of Research and Development 109 TW Alexander Dr., Research Triangle Park, North Carolina 27711, United States.
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Woody
mesh_terms: D000393:Air Pollutants; D004784:Environmental Monitoring; D008962:Models, Theoretical
chemical_list: D000393:Air Pollutants