Influence of urban pollution on the production of organic particulate matter from isoprene epoxydiols in central Amazonia

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  • De Sá, Suzane S.
    • Other Affiliation: School of Engineering and Applied Sciences; Harvard University
  • Palm, Brett B.
    • Other Affiliation: Department of Chemistry and Biochemistry; Cooperative Institute for Research in Environmental Sciences; University of Colorado
  • Campuzano-Jost, Pedro
    • Other Affiliation: Department of Chemistry and Biochemistry; Cooperative Institute for Research in Environmental Sciences; University of Colorado
  • Day, Douglas A.
    • Other Affiliation: Department of Chemistry and Biochemistry; Cooperative Institute for Research in Environmental Sciences; University of Colorado
  • Newburn, Matthew K.
    • Other Affiliation: Environmental Molecular Sciences Laboratory; Pacific Northwest National Laboratory
  • Hu, Weiwei
    • Other Affiliation: Department of Chemistry and Biochemistry; Cooperative Institute for Research in Environmental Sciences; University of Colorado
  • Isaacman-VanWertz, Gabriel
    • Other Affiliation: Dept. of Environmental Science; Policy; and Management; University of California
  • Yee, Lindsay D.
    • Other Affiliation: Dept. of Environmental Science; Policy; and Management; University of California
  • Thalman, Ryan
    • Other Affiliation: Brookhaven National Laboratory
  • Brito, Joel
    • Other Affiliation: Laboratory for Meteorological Physics (LaMP); University Blaise Pascal
  • Carbone, Samara
    • Other Affiliation: Departamento de Física Aplicada; Universidade de São Paulo
  • Artaxo, Paulo
    • Other Affiliation: Departamento de Física Aplicada; Universidade de São Paulo
  • Goldstein, Allen H.
    • Other Affiliation: Dept. of Environmental Science; Policy; and Management; University of California
  • Manzi, Antonio O.
    • Other Affiliation: Instituto Nacional de Pesquisas da Amazonia
  • Souza, Rodrigo A. F.
    • Other Affiliation: Escola Superior de Tecnologia; Universidade do Estado do Amazonas
  • Mei, Fan
    • Other Affiliation: Atmospheric Sciences and Global Change Division; Pacific Northwest National Laboratory
  • Shilling, John E.
    • Other Affiliation: Atmospheric Sciences and Global Change Division; Pacific Northwest National Laboratory
  • Springston, Stephen R.
    • Other Affiliation: Brookhaven National Laboratory
  • Wang, Jian
    • Other Affiliation: Brookhaven National Laboratory
  • Surratt, Jason D.
    • Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
  • Alexander, M. Lizabeth
    • Other Affiliation: Environmental Molecular Sciences Laboratory; Pacific Northwest National Laboratory
  • Jimenez, Jose L.
    • Other Affiliation: Department of Chemistry and Biochemistry; Cooperative Institute for Research in Environmental Sciences; University of Colorado
  • Martin, Scot T.
    • Other Affiliation: School of Engineering and Applied Sciences; Harvard University
Abstract
  • <html>The atmospheric chemistry of isoprene contributes to the production of a substantial mass fraction of the particulate matter (PM) over tropical forests. Isoprene epoxydiols (IEPOX) produced in the gas phase by the oxidation of isoprene under HO<sub>2</sub>-dominant conditions are subsequently taken up by particles, thereby leading to production of secondary organic PM. The present study investigates possible perturbations to this pathway by urban pollution. The measurement site in central Amazonia was located 4 to 6 h downwind of Manaus, Brazil. Measurements took place from February through March 2014 of the wet season, as part of the GoAmazon2014/5 experiment. Mass spectra of organic PM collected with an Aerodyne Aerosol Mass Spectrometer were analyzed by positive-matrix factorization. One resolved statistical factor (<q>IEPOX-SOA factor</q>) was associated with PM production by the IEPOX pathway. The IEPOX-SOA factor loadings correlated with independently measured mass concentrations of tracers of IEPOX-derived PM, namely C<sub>5</sub>-alkene triols and 2-methyltetrols (<i>R</i> = 0. 96 and 0.78, respectively). The factor loading, as well as the ratio <i>f</i> of the loading to organic PM mass concentration, decreased under polluted compared to background conditions. For an increase in NO<sub><i>y</i></sub> concentration from 0.5 to 2 ppb, the factor loading and <i>f</i> decreased by two to three fold. Overall, sulfate concentration explained 37 % of the variability in the factor loading. After segregation of factor loading into subsets based on NO<sub><i>y</i></sub> concentration, the sulfate concentration explained up to 75 % of the variability. Considering both factors, the data sets show that the suppressing effects of increased NO concentrations dominated over the enhancing effects of higher sulfate concentrations. The pollution from Manaus elevated NO<sub><i>y</i></sub> concentrations more significantly than sulfate concentrations relative to background conditions. In this light, increased emissions of nitrogen oxides, as anticipated for some scenarios of Amazonian economic development, could significantly alter pathways of PM production that presently prevail over the tropical forest, implying changes to air quality and regional climate.</html>
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  • Article
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  • In Copyright
Journal title
  • Atmospheric Chemistry and Physics Discussions
Journal volume
  • 17
Journal issue
  • 11
Language
  • English
ISSN
  • 1680-7375
  • 1680-7367

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