Formation of Low Volatility Organic Compounds and Secondary Organic Aerosol from Isoprene Hydroxyhydroperoxide Low-NO Oxidation

Jordan E. Krechmer, Matthew M. Coggon, Paola Massoli, Tran B. Nguyen, John D. Crounse, Weiwei Hu, Douglas A. Day, Geoffrey S. Tyndall, Daven K. Henze, Jean C. Rivera-Rios, John B. Nowak, Joel R. Kimmel, Roy L. Mauldin, Harald Stark, John T. Jayne, Mikko Sipilä, Heikki Junninen, Jason M. St. Clair, Xuan Zhang, Philip A. FeinerLi Zhang, David O. Miller, William H. Brune, Frank N. Keutsch, Paul O. Wennberg, John H. Seinfeld, Douglas R. Worsnop, Jose L. Jimenez, Manjula R. Canagaratna

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112 Scopus citations

Abstract

Gas-phase low volatility organic compounds (LVOC), produced from oxidation of isoprene 4-hydroxy-3-hydroperoxide (4,3-ISOPOOH) under low-NO conditions, were observed during the FIXCIT chamber study. Decreases in LVOC directly correspond to appearance and growth in secondary organic aerosol (SOA) of consistent elemental composition, indicating that LVOC condense (at OA below 1 μg m-3). This represents the first simultaneous measurement of condensing low volatility species from isoprene oxidation in both the gas and particle phases. The SOA formation in this study is separate from previously described isoprene epoxydiol (IEPOX) uptake. Assigning all condensing LVOC signals to 4,3-ISOPOOH oxidation in the chamber study implies a wall-loss corrected non-IEPOX SOA mass yield of ∼4%. By contrast to monoterpene oxidation, in which extremely low volatility VOC (ELVOC) constitute the organic aerosol, in the isoprene system LVOC with saturation concentrations from 10-2 to 10 μg m-3 are the main constituents. These LVOC may be important for the growth of nanoparticles in environments with low OA concentrations. LVOC observed in the chamber were also observed in the atmosphere during SOAS-2013 in the Southeastern United States, with the expected diurnal cycle. This previously uncharacterized aerosol formation pathway could account for ∼5.0 Tg yr-1 of SOA production, or 3.3% of global SOA. (Graph Presented).

Original languageEnglish (US)
Pages (from-to)10330-10339
Number of pages10
JournalEnvironmental Science and Technology
Volume49
Issue number17
DOIs
StatePublished - Sep 1 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

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