Regional Influence of Aerosol Emissions from Wildfires Driven by Combustion Efficiency: Insights from the BBOP Campaign.

Autor: Collier S; Department of Environmental Toxicology, University of California , Davis, California 95616, United States., Zhou S; Department of Environmental Toxicology, University of California , Davis, California 95616, United States., Onasch TB; Aerodyne Research Inc., Billerica, Massachusetts 01821, United States., Jaffe DA; 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., Kleinman L; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States., Sedlacek AJ 3rd; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States., Briggs NL; 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., Hee J; School of Science and Technology, University of Washington , Bothell, Washington 98011, United States., Fortner E; Aerodyne Research Inc., Billerica, Massachusetts 01821, United States., Shilling JE; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States., Worsnop D; Aerodyne Research Inc., Billerica, Massachusetts 01821, United States., Yokelson RJ; Department of Chemistry, University of Montana , Missoula, Montana 59812, United States., Parworth C; Department of Environmental Toxicology, University of California , Davis, California 95616, United States., Ge X; Department of Environmental Toxicology, University of California , Davis, California 95616, United States., Xu J; Department of Environmental Toxicology, University of California , Davis, California 95616, United States., Butterfield Z; Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Chand D; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States., Dubey MK; Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Pekour MS; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States., Springston S; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States., Zhang Q; Department of Environmental Toxicology, University of California , Davis, California 95616, United States.
Jazyk: angličtina
Zdroj: Environmental science & technology [Environ Sci Technol] 2016 Aug 16; Vol. 50 (16), pp. 8613-22. Date of Electronic Publication: 2016 Jul 26.
DOI: 10.1021/acs.est.6b01617
Abstrakt: 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.
Databáze: MEDLINE