title: Regional Influence of Aerosol Emissions from Wildfires Driven by Combustion Efficiency: Insights from the BBOP Campaign.
abstract: Wildfires are important contributors to atmospheric aerosols and a large source of emissions that impact regional air quality and global climate. In this study, the regional and nearfield influences of wildfire emissions on ambient aerosol concentration and chemical properties in the Pacific Northwest region of the United States were studied using real-time measurements from a fixed ground site located in Central Oregon at the Mt. Bachelor Observatory (∼2700 m a.s.l.) as well as near their sources using an aircraft. The regional characteristics of biomass burning aerosols were found to depend strongly on the modified combustion efficiency (MCE), an index of the combustion processes of a fire. Organic aerosol emissions had negative correlations with MCE, whereas the oxidation state of organic aerosol increased with MCE and plume aging. The relationships between the aerosol properties and MCE were consistent between fresh emissions (∼1 h old) and emissions sampled after atmospheric transport (6-45 h), suggesting that biomass burning organic aerosol concentration and chemical properties were strongly influenced by combustion processes at the source and conserved to a significant extent during regional transport. These results suggest that MCE can be a useful metric for describing aerosol properties of wildfire emissions and their impacts on regional air quality and global climate.
authors.affiliation: Department of Environmental Toxicology, University of California , Davis, California 95616, United States.
authors.forename: Sonya
authors.initials: S
authors.lastname: Collier
authors.affiliation: Department of Environmental Toxicology, University of California , Davis, California 95616, United States.
authors.forename: Shan
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Aerodyne Research Inc., Billerica, Massachusetts 01821, United States.
authors.forename: Timothy B
authors.initials: TB
authors.lastname: Onasch
authors.affiliation: School of Science and Technology, University of Washington , Bothell, Washington 98011, United States.|Department of Atmospheric Sciences, University of Washington , Seattle, Washington 98195, United States.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Jaffe
authors.affiliation: Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States.
authors.forename: Lawrence
authors.initials: L
authors.lastname: Kleinman
authors.affiliation: Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States.
authors.forename: Arthur J
authors.initials: AJ
authors.lastname: Sedlacek
authors.affiliation: School of Science and Technology, University of Washington , Bothell, Washington 98011, United States.|Department of Atmospheric Sciences, University of Washington , Seattle, Washington 98195, United States.|Gradient, Seattle Washington 98101, United States.
authors.forename: Nicole L
authors.initials: NL
authors.lastname: Briggs
authors.affiliation: School of Science and Technology, University of Washington , Bothell, Washington 98011, United States.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Hee
authors.affiliation: Aerodyne Research Inc., Billerica, Massachusetts 01821, United States.
authors.forename: Edward
authors.initials: E
authors.lastname: Fortner
authors.affiliation: Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.
authors.forename: John E
authors.initials: JE
authors.lastname: Shilling
authors.affiliation: Aerodyne Research Inc., Billerica, Massachusetts 01821, United States.
authors.forename: Douglas
authors.initials: D
authors.lastname: Worsnop
authors.affiliation: Department of Chemistry, University of Montana , Missoula, Montana 59812, United States.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Yokelson
authors.affiliation: Department of Environmental Toxicology, University of California , Davis, California 95616, United States.
authors.forename: Caroline
authors.initials: C
authors.lastname: Parworth
authors.affiliation: Department of Environmental Toxicology, University of California , Davis, California 95616, United States.
authors.forename: Xinlei
authors.initials: X
authors.lastname: Ge
authors.affiliation: Department of Environmental Toxicology, University of California , Davis, California 95616, United States.
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Xu
authors.affiliation: Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
authors.forename: Zachary
authors.initials: Z
authors.lastname: Butterfield
authors.affiliation: Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.
authors.forename: Duli
authors.initials: D
authors.lastname: Chand
authors.affiliation: Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
authors.forename: Manvendra K
authors.initials: MK
authors.lastname: Dubey
authors.affiliation: Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.
authors.forename: Mikhail S
authors.initials: MS
authors.lastname: Pekour
authors.affiliation: Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States.
authors.forename: Stephen
authors.initials: S
authors.lastname: Springston
authors.affiliation: Department of Environmental Toxicology, University of California , Davis, California 95616, United States.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D018533:Biomass; D004784:Environmental Monitoring; D005390:Fires; D009922:Oregon
chemical_list: D000336:Aerosols; D000393:Air Pollutants