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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

by J S Craven, L D Yee, N L Ng, M R Canagaratna, C L Loza, K A Schilling, R L N Yatavelli, J A Thornton, P J Ziemann, R C Flagan, J H Seinfeld show all authors
Atmos. Chem. Phys. Discuss. ()

Abstract

Positive matrix factorization (PMF) of high-resolution laboratory 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 5 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 10 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

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