Natural and Anthropogenically Influenced Isoprene Oxidation in Southeastern United States and Central Amazon.

Autor: Yee LD; Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720, United States., Isaacman-VanWertz G; Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720, United States., Wernis RA; Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, United States., Kreisberg NM; Aerosol Dynamics Inc., Berkeley, California 94710, United States., Glasius M; Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark., Riva M; Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina 27599, United States., Surratt JD; Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina 27599, United States., de Sá SS; School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 01451, United States., Martin ST; School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 01451, United States.; Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 01451, United States., Alexander ML; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, United States., Palm BB; Department of Chemistry & Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States., Hu W; Department of Chemistry & Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States., Campuzano-Jost P; Department of Chemistry & Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States., Day DA; Department of Chemistry & Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States., Jimenez JL; Department of Chemistry & Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States., Liu Y; School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 01451, United States., Misztal PK; Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720, United States., Artaxo P; Universidade de São Paulo, São Paulo, Brazil 05508-020., Viegas J; Instituto Nacional de Pesquisas da Amazonia, Manaus, Amazonas, Brazil 69060-001., Manzi A; Instituto Nacional de Pesquisas da Amazonia, Manaus, Amazonas, Brazil 69060-001., de Souza RAF; Universidade do Estado do Amazonas, Manaus, Amazonas, Brazil 69735-000., Edgerton ES; Atmospheric Research & Analysis, Inc., Cary, North Carolina 27513, United States., Baumann K; Atmospheric Research & Analysis, Inc., Cary, North Carolina 27513, United States., Goldstein AH; Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720, United States.; Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, United States.
Jazyk: angličtina
Zdroj: Environmental science & technology [Environ Sci Technol] 2020 May 19; Vol. 54 (10), pp. 5980-5991. Date of Electronic Publication: 2020 Apr 27.
DOI: 10.1021/acs.est.0c00805
Abstrakt: Anthropogenic emissions alter secondary organic aerosol (SOA) formation chemistry from naturally emitted isoprene. We use correlations of tracers and tracer ratios to provide new perspectives on sulfate, NO x , and particle acidity influencing isoprene-derived SOA in two isoprene-rich forested environments representing clean to polluted conditions-wet and dry seasons in central Amazonia and Southeastern U.S. summer. We used a semivolatile thermal desorption aerosol gas chromatograph (SV-TAG) and filter samplers to measure SOA tracers indicative of isoprene/HO 2 (2-methyltetrols, C 5 -alkene triols, 2-methyltetrol organosulfates) and isoprene/NO x (2-methylglyceric acid, 2-methylglyceric acid organosulfate) pathways. Summed concentrations of these tracers correlated with particulate sulfate spanning three orders of magnitude, suggesting that 1 μg m -3 reduction in sulfate corresponds with at least ∼0.5 μg m -3 reduction in isoprene-derived SOA. We also find that isoprene/NO x pathway SOA mass primarily comprises organosulfates, ∼97% in the Amazon and ∼55% in Southeastern United States. We infer under natural conditions in high isoprene emission regions that preindustrial aerosol sulfate was almost exclusively isoprene-derived organosulfates, which are traditionally thought of as representative of an anthropogenic influence. We further report the first field observations showing that particle acidity correlates positively with 2-methylglyceric acid partitioning to the gas phase and negatively with the ratio of 2-methyltetrols to C 5 -alkene triols.
Databáze: MEDLINE