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| Titel |
Source apportionment of the summer time carbonaceous aerosol at Nordic rural background sites |
| VerfasserIn |
K. E. Yttri, D. Simpson, J. K. Nøjgaard, K. Kristensen, J. Genberg, K. Stenström, E. Swietlicki, R. Hillamo, M. Aurela, H. Bauer, J. H. Offenberg, M. Jaoui, C. Dye, S. Eckhardt, J. F. Burkhart, A. Stohl, M. Glasius |
| 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 (2011-12-22), S.13339-13357 |
| Datensatznummer |
250010306
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| Publikation (Nr.) |
 copernicus.org/acp-11-13339-2011.pdf |
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| Zusammenfassung |
| In the present study, natural and anthropogenic sources of particulate
organic carbon (OCp) and elemental carbon (EC) have been quantified
based on weekly filter samples of PM10 (particles with aerodynamic
diameter <10 μm) collected at four Nordic rural background sites
[Birkenes (Norway), Hyytiälä (Finland), Vavihill (Sweden), Lille
Valby, (Denmark)] during late summer (5 August–2 September 2009). Levels
of source specific tracers, i.e. cellulose, levoglucosan, mannitol and the
14C/12C ratio of total carbon (TC), have been used as input for
source apportionment of the carbonaceous aerosol, whereas Latin Hypercube
Sampling (LHS) was used to statistically treat the multitude of possible
combinations resulting from this approach.
The carbonaceous aerosol (here: TCp; i.e. particulate TC) was totally
dominated by natural sources (69–86%), with biogenic secondary organic
aerosol (BSOA) being the single most important source (48–57%).
Interestingly, primary biological aerosol particles (PBAP) were the second
most important source (20–32%). The anthropogenic contribution was mainly
attributed to fossil fuel sources (OCff and ECff) (10–24%),
whereas no more than 3–7% was explained by combustion of biomass
(OCbb and ECbb) in this late summer campaign i.e. emissions from
residential wood burning and/or wild/agricultural fires. Fossil fuel sources
totally dominated the ambient EC loading, which accounted for 4–12% of
TCp, whereas <1.5% of EC was attributed to combustion of biomass.
The carbonaceous aerosol source apportionment showed only minor variation
between the four selected sites. However, Hyytiälä and Birkenes
showed greater resemblance to each other, as did Lille Valby and Vavihill,
the two latter being somewhat more influenced by anthropogenic sources.
Ambient levels of organosulphates and nitrooxy-organosulphates in the Nordic
rural background environment are reported for the first time in the present
study. The most abundant organosulphate compounds were an organosulphate of
isoprene and nitrooxy-organosulphates of α- and β-pinene and
limonene. |
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