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
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 microg m-3, 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/6542
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-63972
SN  - 1680-7316
SN  - 1680-7324
N1  - © Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License.
VL  - 9
SP  - 3049
EP  - 3060
PB  - European Geosciences Union
CY  - Katlenburg-Lindau
ER  -