ACTRIS ACSM intercomparison - Part 2: Intercomparison of ME-2 organic source apportionment results from 15 individual, co-located aerosol mass spectrometers
Roman Fröhlich,Vincent Crenn,Ari Setyan,Claudio A. Belis,Francesco Canonaco,Olivier Favez,Véronique Riffault,Jay G. Slowik,Wenche Aas,Mikko Äijälä,Andrés Alastuey,B. Artiñano,Nicolas Bonnaire,Carlo Bozzetti,M. Bressi,C. Carbone,Esther Coz,Philip Croteau,Michael J. Cubison,J. K. Esser-Gietl,David C. Green,Valérie Gros,Liine Heikkinen,Hartmut Herrmann,J. T. Jayne,Chris Rene Lunder,María Cruz Minguillón,Griša Močnik,Colin D. O'Dowd,Jurgita Ovadnevaite,Ettore Petralia,Laurent Poulain,Max Priestman,Anna Ripoll,Roland Sarda-Esteve,A. Wiedensohler,Urs Baltensperger,Jean Sciare,Jean Sciare,André S. H. Prévôt +39 more
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In this article, the authors report on the results from factor analysis source apportionment by positive matrix factorization (PMF) utilising the multilinear engine 2 (ME-2).Abstract:
. Chemically resolved atmospheric aerosol data sets from the largest intercomparison of the Aerodyne aerosol chemical speciation monitors (ACSMs) performed to date were collected at the French atmospheric supersite SIRTA. In total 13 quadrupole ACSMs (Q-ACSM) from the European ACTRIS ACSM network, one time-of-flight ACSM (ToF-ACSM), and one high-resolution ToF aerosol mass spectrometer (AMS) were operated in parallel for about 3 weeks in November and December~2013. Part 1 of this study reports on the accuracy and precision of the instruments for all the measured species. In this work we report on the intercomparison of organic components and the results from factor analysis source apportionment by positive matrix factorisation (PMF) utilising the multilinear engine 2 (ME-2). Except for the organic contribution of mass-to-charge ratio m/z 44 to the total organics (f44), which varied by factors between 0.6 and 1.3 compared to the mean, the peaks in the organic mass spectra were similar among instruments. The m/z 44 differences in the spectra resulted in a variable f44 in the source profiles extracted by ME-2, but had only a minor influence on the extracted mass contributions of the sources. The presented source apportionment yielded four factors for all 15 instruments: hydrocarbon-like organic aerosol (HOA), cooking-related organic aerosol (COA), biomass burning-related organic aerosol (BBOA) and secondary oxygenated organic aerosol (OOA). ME-2 boundary conditions (profile constraints) were optimised individually by means of correlation to external data in order to achieve equivalent / comparable solutions for all ACSM instruments and the results are discussed together with the investigation of the influence of alternative anchors (reference profiles). A comparison of the ME-2 source apportionment output of all 15 instruments resulted in relative standard deviations (SD) from the mean between 13.7 and 22.7 % of the source's average mass contribution depending on the factors (HOA: 14.3 ± 2.2 %, COA: 15.0 ± 3.4 %, OOA: 41.5 ± 5.7 %, BBOA: 29.3 ± 5.0 %). Factors which tend to be subject to minor factor mixing (in this case COA) have higher relative uncertainties than factors which are recognised more readily like the OOA. Averaged over all factors and instruments the relative first SD from the mean of a source extracted with ME-2 was 17.2 %.read more
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European guide on air pollution source apportionment with receptor models.
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