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| Titel |
Fourteen months of on-line measurements of the non-refractory submicron aerosol at the Jungfraujoch (3580 m a.s.l.) – chemical composition, origins and organic aerosol sources |
| VerfasserIn |
R. Fröhlich, M. J. Cubison, J. G. Slowik, N. Bukowiecki, F. Canonaco, P. L. Croteau, M. Gysel, S. Henne, E. Herrmann, J. T. Jayne, M. Steinbacher, D. R. Worsnop, U. Baltensperger, A. S. H. Prévôt |
| 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 ; 15, no. 19 ; Nr. 15, no. 19 (2015-10-14), S.11373-11398 |
| Datensatznummer |
250120095
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| Publikation (Nr.) |
 copernicus.org/acp-15-11373-2015.pdf |
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| Zusammenfassung |
| Chemically resolved (organic, nitrate, sulfate, ammonium) data of non-refractory submicron (NR-PM1) aerosol
from the first long-term deployment (27 July 2012 to 02 October 2013) of
a time-of-flight aerosol chemical speciation monitor (ToF-ACSM) at the Swiss
high-altitude site Jungfraujoch (JFJ; 3580 m a.s.l.) are presented. Besides
total mass loadings, diurnal variations and relative species contributions
during the different meteorological seasons, geographical origin and sources
of organic aerosol (OA) are discussed. Backward transport simulations show
that the highest (especially sulfate) concentrations of NR-PM1 were
measured in air masses advected to the station from regions south of the JFJ,
while lowest concentrations were seen from western regions. OA source
apportionment for each season was performed using the Source Finder (SoFi)
interface for the multilinear engine (ME-2). OA was dominated in all seasons
by oxygenated OA (OOA, 71–88 %), with lesser contributions from
local tourism-related activities (7–12 %) and hydrocarbon-like OA
related to regional vertical transport (3–9 %). In summer the OOA
can be separated into a background low-volatility OA (LV-OOA I, possibly
associated with long-range transport) and a slightly less oxidised
low-volatility OA (LV-OOA II) associated with regional vertical transport.
Wood burning-related OA associated with regional transport was detected
during the whole winter 2012/2013 and during rare events in summer 2013, in
the latter case attributed to small-scale transport for the surrounding
valleys. Additionally, the data were divided into periods with free
tropospheric (FT) conditions and periods with planetary boundary layer (PBL)
influence, enabling the assessment of the composition for each. Most nitrate
and part of the OA are injected from the regional PBL, while sulfate is
mainly produced in the FT. The south/north gradient of sulfate is also
pronounced in FT air masses (sulfate mass fraction from the south:
45 %; from the north: 29 %). Furthermore, a detailed
investigation of specific marker fragments of the OA spectra (f43,
f44, f55, f57, f60) showed different degrees of ageing
depending on season. |
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