title: The Impact of Iodide-Mediated Ozone Deposition and Halogen Chemistry on Surface Ozone Concentrations Across the Continental United States.
abstract: The air quality of many large coastal areas in the United States is affected by the confluence of polluted urban and relatively clean marine airmasses, each with distinct atmospheric chemistry. In this context, the role of iodide-mediated ozone (O3) deposition over seawater and marine halogen chemistry accounted for in both the lateral boundary conditions and coastal waters surrounding the continental U.S. is examined using the Community Multiscale Air Quality (CMAQ) model. Several nested simulations are conducted in which these halogen processes are implemented separately in the continental U.S. and hemispheric CMAQ domains, the latter providing lateral boundary conditions for the former. Overall, it is the combination of these processes within both the continental U.S. domain and from lateral boundary conditions that lead to the largest reductions in modeled surface O3concentrations. Predicted reductions in surface O3concentrations occur mainly along the coast where CMAQ typically has large overpredictions. These results suggest that a realistic representation of halogen processes in marine regions can improve model prediction of O3concentrations near the coast.
authors.affiliation: Office of Air Quality Planning and Standards, US Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States.
authors.forename: Brett
authors.identifier: 0000-0001-7217-2715
authors.initials: B
authors.lastname: Gantt
authors.affiliation: National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States.
authors.forename: Golam
authors.initials: G
authors.lastname: Sarwar
authors.affiliation: National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States.
authors.forename: Jia
authors.initials: J
authors.lastname: Xing
authors.affiliation: Office of Air Quality Planning and Standards, US Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States.
authors.forename: Heather
authors.initials: H
authors.lastname: Simon
authors.affiliation: National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States.
authors.forename: Donna
authors.initials: D
authors.lastname: Schwede
authors.affiliation: National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States.
authors.forename: William T
authors.initials: WT
authors.lastname: Hutzell
authors.affiliation: National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency , Research Triangle Park, North Carolina 27711, United States.
authors.forename: Rohit
authors.initials: R
authors.lastname: Mathur
authors.affiliation: Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC , Madrid 28006, Spain.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Saiz-Lopez
mesh_terms: D000393:Air Pollutants; D004784:Environmental Monitoring; D006219:Halogens; D007454:Iodides; D008962:Models, Theoretical; D010126:Ozone; D014481:United States
chemical_list: D000393:Air Pollutants; D006219:Halogens; D007454:Iodides; D010126:Ozone