Observational Insights into Aerosol Formation from Isoprene

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  • D.R. Worton, University of California, United States
  • J.D. Surratt, University of North Carolina at Chapel Hill, United States
  • B.W. Lafranchi, University of California, United States
  • A.W.H. Chan, University of California, United States
  • Yunliang Zhao, University of California, United States
  • Robin J. Weber, University of California, United States
  • J.-H. Park, University of California, United States
  • J.B. Gilman, University of Colorado, United States
  • J. De Gouw, University of Colorado, United States
  • C. Park, Texas A and M University, United States
  • G. Schade, Texas A and M University, United States
  • M. Beaver, California Institute of Technology, United States
  • J.M.S. Clair, California Institute of Technology, United States
  • J. Crounse, California Institute of Technology, United States
  • P. Wennberg, California Institute of Technology, United States
  • G.M. Wolfe, University of Washington, United States
  • S. Harrold, University of Washington, United States
  • J.A. Thornton, University of Washington, United States
  • D.K. Farmer, University of Colorado, United States
  • K.S. Docherty, University of Colorado, United States
  • M.J. Cubison, University of Colorado, United States
  • J.-L. Jimenez, University of Colorado, United States
  • A.A. Frossard, University of California, San Diego, United States
  • L.M. Russell, University of California, San Diego, United States
  • Kasper Kristensen
  • M. Glasius
  • J. Mao, Princeton University, United States
  • X. Ren, NOAA, United States
  • W. Brune, Pennsylvania State University, United States
  • E.C. Browne, Massachusetts Institute of Technology, United States
  • S.E. Pusede, University of California, United States
  • R.C. Cohen, University of California, United States
  • J.H. Seinfeld, California Institute of Technology, United States
  • A.H. Goldstein, University of California, United States
Atmospheric photooxidation of isoprene is an important source of secondary organic aerosol (SOA) and there is increasing evidence that anthropogenic oxidant emissions can enhance this SOA formation. In this work, we use ambient observations of organosulfates formed from isoprene epoxydiols (IEPOX) and methacrylic acid epoxide (MAE) and a broad suite of chemical measurements to investigate the relative importance of nitrogen oxide (NO/NO) and hydroperoxyl (HO) SOA formation pathways from isoprene at a forested site in California. In contrast to IEPOX, the calculated production rate of MAE was observed to be independent of temperature. This is the result of the very fast thermolysis of MPAN at high temperatures that affects the distribution of the MPAN reservoir (MPAN / MPA radical) reducing the fraction that can react with OH to form MAE and subsequently SOA (F). The strong temperature dependence of F helps to explain our observations of similar concentrations of IEPOX-derived organosulfates (IEPOX-OS; ∼1 ng m) and MAE-derived organosulfates (MAE-OS; ∼1 ng m) under cooler conditions (lower isoprene concentrations) and much higher IEPOX-OS (∼20 ng m) relative to MAE-OS (
Original languageEnglish
JournalEnvironmental Science & Technology (Washington)
Volume47
Issue20
Pages (from-to)11403-11413
Number of pages11
ISSN0013-936X
DOIs
Publication statusPublished - 2013

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