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Journal article

Analysis of secondary organic aerosol formation and aging using positive matrix factorization of high-resolution aerosol mass spectra: application to the dodecane low-NOx system

Craven J, Yee L, Ng N, Canagaratna M, Loza C, Schilling K, Yatavelli R, Thornton J, Ziemann P, Flagan R, Seinfeld J ...see all

Atmospheric Chemistry and Physics Discussions, vol. 12, issue 7 (2012) pp. 16647-16699

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Abstract

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-NOx 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-NOx 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.

Author-supplied keywords

  • air-pollution sources
  • chamber
  • factor-analytic models
  • gas
  • hydrocarbons
  • oh oxidation
  • photooxidation
  • soa
  • source apportionment
  • spectrometer

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Authors

  • J. S. Craven

  • L. D. Yee

  • N. L. Ng

  • M. R. Canagaratna

  • C. L. Loza

  • K. a. Schilling

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