TY - JOUR A1 - Chan, Arthur Wing Hong A1 - Kautzman, Kathryn E. A1 - Chhabra, Puneet Singh A1 - Surratt, Jason D. A1 - Chan, Man N. A1 - Crounse, John D. A1 - Kürten, Christoph Andreas A1 - Wennberg, Paul O. A1 - Flagan, Richard C. A1 - Seinfeld, John H. T1 - Secondary organic aerosol formation from photooxidation of naphthalene and alkylnaphthalenes: implications for oxidation of intermediate volatility organic compounds (IVOCs) T2 - Atmospheric chemistry and physics / Discussions N2 - Current atmospheric models do not include secondary organic aerosol (SOA) production from gas-phase reactions of polycyclic aromatic hydrocarbons (PAHs). Recent studies have shown that primary semivolatile emissions, previously assumed to be inert, undergo oxidation in the gas phase, leading to SOA formation. This opens the possibility that low-volatility gas-phase precursors are a potentially large source of SOA. In this work, SOA formation from gas-phase photooxidation of naphthalene, 1-methylnaphthalene (1-MN), 2-methylnaphthalene (2-MN), and 1,2-dimethylnaphthalene (1,2-DMN) is studied in the Caltech dual 28-m3 chambers. Under high-NOx conditions and aerosol mass loadings between 10 and 40 μg m, the SOA yields (mass of SOA per mass of hydrocarbon reacted) ranged from 0.19 to 0.30 for naphthalene, 0.19 to 0.39 for 1-MN, 0.26 to 0.45 for 2-MN, and constant at 0.31 for 1,2-DMN. Under low-NOx conditions, the SOA yields were measured to be 0.73, 0.68, and 0.58, for naphthalene, 1-MN, and 2-MN, respectively. The SOA was observed to be semivolatile under high-NOx conditions and essentially nonvolatile under low-NOx conditions, owing to the higher fraction of ring-retaining products formed under low-NOx conditions. When applying these measured yields to estimate SOA formation from primary emissions of diesel engines and wood burning, PAHs are estimated to yield 3–5 times more SOA than light aromatic compounds. PAHs can also account for up to 54% of the total SOA from oxidation of diesel emissions, representing a potentially large source of urban SOA. Y1 - 2009 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/29251 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-292518 SN - 1680-7367 SN - 1680-7375 N1 - © Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License. VL - 9 SP - 1873 EP - 1905 PB - European Geosciences Union CY - Katlenburg-Lindau ER -