Loading-dependent elemental composition of α-pinene SOA particles

J. E. Shilling, Q. Chen, S. M. King, T. Rosenoern, J. H. Kroll, D. R. Worsnop, P. F. DeCarlo, A. C. Aiken, D. Sueper, J. L. Jimenez, S. T. Martin
2009 Atmospheric Chemistry and Physics  
OC ratios of primary, secondary, and ambient organic aerosols with high resolution time-of-flight aerosol mass spectrometry, Environ. Sci. Technol., 42, 4478-4485, 2008. : Mass spectrometric analysis and aerodynamic properties of various types of combustion-related aerosol particles, Int. J. Mass Spectrom., 258, 37-49, 2006. Table S1 . SOA particle mass loadings and the measured O/C and H/C atomic ratios used in the basis-set fitting (i.e., entries of Table 2 ). Figure S1. Correlation plots
more » ... rrelation plots between unit-mass-resolution signal intensity and highresolution oxygen-to-carbon atomic ratio. Except for the bottom-left panel, vertical axes show the percent contribution of the signal intensity of the indicated m/z value to the total organic signal. For the bottom-left panel, the vertical axis shows the ratio of the signal intensity at m/z 44 to that at m/z 43. Figure S2. Measured oxygen-to-carbon atomic ratio vs. the 44/org signal for SOA particles produced from the dark ozonolysis of α-pinene. The linear regression through the data is shown in the solid line. The data points and the regression of Aiken et al. (2008) for ambient ground and aircraft measurements during the MILAGRO campaign are also shown. Equations for the linear fits and correlation coefficients are given in the figure. Figure S3. Example of the deconvolution of a high-resolution mass spectrum for fragments at m/z 43. Peaks representing high-resolution model fits of C 2 H 3 O + and C 3 H 7 + are shown in the figure (DeCarlo et al., 2006). Panel i shows the residual between the recorded data and model fits for panel ii (gold), panel iii (grey), and panel iv (red). Panel ii, which was recorded with the AMS chopper open, shows the mass spectrum of the particles and the background. Panel iii, which was recorded with the AMS chopper closed,
doi:10.5194/acp-9-771-2009 fatcat:fsceq75djvaz3izy2phpx3qqym