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| Titel |
ACTRIS ACSM intercomparison – Part 2: Intercomparison of ME-2 organic source apportionment results from 15 individual, co-located aerosol mass spectrometers |
| VerfasserIn |
R. Fröhlich, V. Crenn, A. Setyan, C. A. Belis, F. Canonaco, O. Favez, V. Riffault, J. G. Slowik, W. Aas, M. Äijälä, A. Alastuey, B. Artíñano, N. Bonnaire, C. Bozzetti, M. Bressi, C. Carbone, E. Coz, P. L. Croteau, M. J. Cubison, J. K. Esser-Gietl, D. C. Green, V. Gros, L. Heikkinen, H. Herrmann, J. T. Jayne, C. R. Lunder, M. C. Minguillón, G. Mocnik, C. D. O'Dowd, J. Ovadnevaite, E. Petralia, L. Poulain, M. Priestman, A. Ripoll, R. Sarda-Estève, A. Wiedensohler, U. Baltensperger, J. Sciare, A. S. H. Prévôt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 6 ; Nr. 8, no. 6 (2015-06-24), S.2555-2576 |
| Datensatznummer |
250116440
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| Publikation (Nr.) |
 copernicus.org/amt-8-2555-2015.pdf |
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| Zusammenfassung |
| 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 %. |
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