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| Titel |
Carbonaceous aerosols in Norwegian urban areas |
| VerfasserIn |
K. E. Yttri, C. Dye, O.-A. Braathen, D. Simpson, E. Steinnes |
| 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 ; 9, no. 6 ; Nr. 9, no. 6 (2009-03-20), S.2007-2020 |
| Datensatznummer |
250007090
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| Publikation (Nr.) |
 copernicus.org/acp-9-2007-2009.pdf |
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| Zusammenfassung |
Little is known regarding levels and source strength of carbonaceous
aerosols in Scandinavia. In the present study, ambient aerosol (PM10
and PM2.5) concentrations of elemental carbon (EC), organic carbon
(OC), water-insoluble organic carbon (WINSOC), and water-soluble organic
carbon (WSOC) are reported for a curbside site, an urban background site,
and a suburban site in Norway in order to investigate their spatial and
seasonal variations. Aerosol filter samples were collected using tandem
filter sampling to correct for the positive sampling artefact introduced by
volatile and semivolatile OC. Analyses were performed using the thermal
optical transmission (TOT) instrument from Sunset Lab Inc., which corrects
for charring during analysis. Finally, we estimated the relative
contribution of OC from wood burning based on the samples content of
levoglucosan.
Levels of EC varied by more than one order of magnitude between sites,
likely due to the higher impact of vehicular traffic at the curbside and the
urban background sites. In winter, the level of particulate organic carbon
(OCp) at the suburban site was equal to (for PM10) or even higher
(for PM2.5) than the levels observed at the curbside and the urban
background sites. This finding was attributed to the impact of residential
wood burning at the suburban site in winter, which was confirmed by a high
mean concentration of levoglucosan (407 ng m−3). This finding indicates
that exposure to primary combustion derived OCp could be equally high
in residential areas as in a city center. It is demonstrated that OCp
from wood burning (OCwood) accounted for almost all OCp at the
suburban site in winter, allowing a new estimate of the ratio
TCp/levoglucosan for both PM10 and PM2.5. Particulate
carbonaceous material (PCM=Organic matter+Elemental matter) accounted
for 46–83% of PM10 at the sites studied, thus being the major
fraction. |
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