OA Factors (ACP 2010)
Integrated Analysis: OA Factors
Reference: N.L. Ng, M.R. Canagaratna, Q. Zhang, J.L. Jimenez, J. Tian, I.M. Ulbrich, J.H. Kroll, K.S. Docherty, P.S. Chhabra, R. Bahreini, S.M. Murphy, J.H. Seinfeld, L. Hildebrandt, N.M. Donahue, P.F. DeCarlo, V.A. Lanz, A.S.H. Prevot, E. Dinar, Y. Rudich, and D.R. Worsnop (2009) Organic aerosol components observed in Northern Hemispheric datasets from Aerosol Mass Spectrometry, Atmospheric Chemistry and Physics 10, 10, doi:10.5194/acp-10-4625-2010 PDF.
Figure 1. f44 vs. f43 for all the OOA components from different sites, including Mexico city ground and flight data (Aiken et al., 2009b; Jimenez et al., 2009), as well as various HULIS (humic-like substances) and fulvic acid samples. The dotted lines are added to guide the eye and define the triangular space where ambient OOA components fall. The slope and intercept of the line on the left hand side are -6.0204 and 0.4154; the slope and intercept of the line on the right hand side are −1.8438 and 0.3319, valid for 0.069 ≤ x ≤ 0.18, and y ≤ 0.295.
Figure 2. Example mass spectra of the HOA, total OOA, LV-OOA and SV-OOA components identified from the Pittsburgh dataset (Zhang et al., 2007; Ulbrich et al., 2009). Note that the total OOA spectrum is not the average of the LV-OOA and SV-OOA because LV-OOA accounts for a much larger fraction (59%) of OA than SV-OOA (10%) in Pittsburgh.
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