Analysis of secondary organic aerosol formation and aging using positive matrix factorization of high-resolution aerosol mass spectra: application to the dodecane low-NO.sub.x system

Positive matrix factorization (PMF) of high-resolution laboratory chamber aerosol mass spectra is applied for the first time, the results of which are consistent with molecular level MOVI-HRToF-CIMS aerosol-phase and CIMS gas-phase measurements. Secondary organic aerosol was generated by photooxidat...

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Bibliographic Details
Published in:Atmospheric chemistry and physics 2012-12, Vol.12 (24), p.11795
Main Authors: Craven, J. S, Yee, L. D, Ng, N. L, Canagaratna, M. R, Loza, C. L, Schilling, K. A, Yatavelli, R. L. N, Thornton, J. A, Ziemann, P. J, Flagan, R. C, Seinfeld, J. H
Format: Article
Language:English
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Summary:Positive matrix factorization (PMF) of high-resolution laboratory chamber aerosol mass spectra is applied for the first time, the results of which are consistent with molecular level MOVI-HRToF-CIMS aerosol-phase and CIMS gas-phase measurements. Secondary organic aerosol was generated by photooxidation of dodecane under low-NO.sub.x conditions in the Caltech environmental chamber. The PMF results exhibit three factors representing a combination of gas-particle partitioning, chemical conversion in the aerosol, and wall deposition. The slope of the measured high-resolution aerosol mass spectrometer (HR-ToF-AMS) composition data on a Van Krevelen diagram is consistent with that of other low-NO.sub.x alkane systems in the same O : C range. Elemental analysis of the PMF factor mass spectral profiles elucidates the combinations of functionality that contribute to the slope on the Van Krevelen diagram.
ISSN:1680-7316
1680-7324