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| Titel |
Seasonal variations in aerosol particle composition at the puy-de-Dôme research station in France |
| VerfasserIn |
E. J. Freney, K. Sellegri, F. Canonaco, J. Boulon, M. Hervo, R. Weigel, J. M. Pichon, A. Colomb, A. S. H. Prévôt, P. Laj |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 24 ; Nr. 11, no. 24 (2011-12-21), S.13047-13059 |
| Datensatznummer |
250010293
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| Publikation (Nr.) |
 copernicus.org/acp-11-13047-2011.pdf |
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| Zusammenfassung |
| Detailed investigations of the chemical and microphysical properties of
atmospheric aerosol particles were performed at the puy-de-Dôme (pdD)
research station (1465 m) in autumn (September and October 2008), winter
(February and March 2009), and summer (June 2010) using a compact
Time-of-Flight Aerosol Mass Spectrometer (cToF-AMS). Over the three
campaigns, the average mass concentrations of the non-refractory submicron
particles ranged from 10 μg m−3 up to
27 μg m−3. Highest nitrate and ammonium mass
concentrations were measured during the winter and during periods when marine
modified airmasses were arriving at the site, whereas highest concentrations
of organic particles were measured during the summer and during periods when
continental airmasses arrived at the site. The measurements reported in this
paper show that atmospheric particle composition is strongly influenced by
both the season and the origin of the airmass. The total organic mass spectra
were analysed using positive matrix factorisation to separate individual
organic components contributing to the overall organic particle mass
concentrations. These organic components include a low volatility oxygenated
organic aerosol particle (LV-OOA) and a semi-volatile organic aerosol
particle (SV-OOA). Correlations of the LV-OOA components with fragments of
m/z 60 and m/z 73 (mass spectral markers of wood burning)
during the winter campaign suggest that wintertime LV-OOA are related to aged
biomass burning emissions, whereas organic aerosol particles measured during
the summer are likely linked to biogenic sources. Equivalent potential
temperature calculations, gas-phase, and LIDAR measurements define whether
the research site is in the planetary boundary layer (PBL) or in the free
troposphere (FT)/residual layer (RL). We observe that SV-OOA and nitrate
particles are associated with air masses arriving from the PBL where as
particle composition measured from RL/FT airmasses contain high mass
fractions of sulphate and LV-OOA. This study provides unique insights into
the effects of season and airmass variability on regional aerosol particles
measured at an elevated site. |
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