title: Modeling the Current and Future Roles of Particulate Organic Nitrates in the Southeastern United States.
abstract: Organic nitrates are an important aerosol constituent in locations where biogenic hydrocarbon emissions mix with anthropogenic NOx sources. While regional and global chemical transport models may include a representation of organic aerosol from monoterpene reactions with nitrate radicals (the primary source of particle-phase organic nitrates in the Southeast United States), secondary organic aerosol (SOA) models can underestimate yields. Furthermore, SOA parametrizations do not explicitly take into account organic nitrate compounds produced in the gas phase. In this work, we developed a coupled gas and aerosol system to describe the formation and subsequent aerosol-phase partitioning of organic nitrates from isoprene and monoterpenes with a focus on the Southeast United States. The concentrations of organic aerosol and gas-phase organic nitrates were improved when particulate organic nitrates were assumed to undergo rapid (τ = 3 h) pseudohydrolysis resulting in nitric acid and nonvolatile secondary organic aerosol. In addition, up to 60% of less oxidized-oxygenated organic aerosol (LO-OOA) could be accounted for via organic nitrate mediated chemistry during the Southern Oxidants and Aerosol Study (SOAS). A 25% reduction in nitrogen oxide (NO + NO2) emissions was predicted to cause a 9% reduction in organic aerosol for June 2013 SOAS conditions at Centreville, Alabama.
authors.affiliation: National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States.
authors.forename: Havala O T
authors.initials: HO
authors.lastname: Pye
authors.affiliation: National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States.
authors.forename: Deborah J
authors.initials: DJ
authors.lastname: Luecken
authors.affiliation: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
authors.forename: Lu
authors.initials: L
authors.lastname: Xu
authors.affiliation: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Boyd
authors.affiliation: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.|School of Earth and Atmospheric Sciences, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
authors.forename: Nga L
authors.initials: NL
authors.lastname: Ng
authors.affiliation: Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States.
authors.forename: Kirk R
authors.initials: KR
authors.lastname: Baker
authors.affiliation: Department of Chemistry, Reed College , Portland, Oregon 97202, United States.
authors.forename: Benjamin R
authors.initials: BR
authors.lastname: Ayres
authors.affiliation: National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States.
authors.forename: Jesse O
authors.initials: JO
authors.lastname: Bash
authors.affiliation: Atmospheric Research and Analysis, Inc., Cary, North Carolina 27513, United States.
authors.forename: Karsten
authors.initials: K
authors.lastname: Baumann
authors.affiliation: College of Engineering, Center for Environmental Research and Technology, University of California at Riverside , Riverside, California 92512, United States.
authors.forename: William P L
authors.initials: WP
authors.lastname: Carter
authors.affiliation: Atmospheric Research and Analysis, Inc., Cary, North Carolina 27513, United States.
authors.forename: Eric
authors.initials: E
authors.lastname: Edgerton
authors.affiliation: Department of Chemistry, Reed College , Portland, Oregon 97202, United States.
authors.forename: Juliane L
authors.initials: JL
authors.lastname: Fry
authors.affiliation: National Exposure Research Laboratory, U.S. 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, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States.
authors.forename: Donna B
authors.initials: DB
authors.lastname: Schwede
authors.affiliation: Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States.
authors.forename: Paul B
authors.initials: PB
authors.lastname: Shepson
mesh_terms: D000336:Aerosols / Q000032:analysis* / Q000737:chemistry*; D000393:Air Pollutants / Q000032:analysis*; D000407:Alabama; D002070:Butadienes / Q000737:chemistry; D045782:Hemiterpenes / Q000737:chemistry; D008956:Models, Chemical; D008962:Models, Theoretical; D039821:Monoterpenes / Q000737:chemistry; D009566:Nitrates / Q000032:analysis* / Q000737:chemistry; D009589:Nitrogen Oxides / Q000032:analysis / Q000737:chemistry; D010420:Pentanes / Q000737:chemistry; D015144:Southeastern United States
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D002070:Butadienes; D045782:Hemiterpenes; D039821:Monoterpenes; D009566:Nitrates; D009589:Nitrogen Oxides; D010420:Pentanes; C005059:isoprene