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<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics Discussions</journal_title>
		<journal_url>www.atmos-chem-phys-discuss.net</journal_url>
		<issn>1680-7367</issn>
		<eissn>1680-7375</eissn>
		<volume_number>8</volume_number>
		<issue_number>6</issue_number>
		<publication_year>2008</publication_year>
	</journal>
	<doi>10.5194/acpd-8-19487-2008</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/8/19487/2008/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/8/19487/2008/acpd-8-19487-2008.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/8/19487/2008/acpd-8-19487-2008.pdf</fulltext_pdf>
	<start_page>19487</start_page>
	<end_page>19525</end_page>
	<publication_date>2008-11-17</publication_date>
	<article_title content_type="html">Carbonaceous aerosols at urban influenced sites in Norway</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>K. E. Yttri</name>
			<email>key@nilu.no</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>C. Dye</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>O.-A. Braathen</name>
		</author>
		<author numeration="4" affiliations="2,3">
			<name>D. Simpson</name>
		</author>
		<author numeration="5" affiliations="4">
			<name>E. Steinnes</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway</affiliation>
		<affiliation numeration="2" content_type="html">Norwegian Meteortological Institute, P.B. 43 Blindern, 0313 Oslo, Norway</affiliation>
		<affiliation numeration="3" content_type="html">Dept. of Radio and Space Science, Chalmers University of Technology, Gothenburg, Sweden</affiliation>
		<affiliation numeration="4" content_type="html">Dept. of Chemistry, Norwegian University of Science and Technology, 7491 Trondheim, Norway</affiliation>
	</affiliations>
	<abstract content_type="html">Little is known regarding levels and source strength of carbonaceous
aerosols in Scandinavia. In the present study, ambient aerosol (PM&lt;sub&gt;10&lt;/sub&gt;
and PM&lt;sub&gt;2.5&lt;/sub&gt;) 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
semi volatile 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.
&lt;br&gt;&lt;br&gt;
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
(OC&lt;sub&gt;p&lt;/sub&gt;) at the suburban site was equal to (for PM&lt;sub&gt;10&lt;/sub&gt;) or even higher
(for PM&lt;sub&gt;2.5&lt;/sub&gt;) 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&lt;sup&gt;&amp;minus;3&lt;/sup&gt;). This finding indicates
that exposure to primary combustion derived OC&lt;sub&gt;p&lt;/sub&gt; could be equally high
in residential areas as in a city center. It is demonstrated that OC&lt;sub&gt;p&lt;/sub&gt;
from wood burning (OC&lt;sub&gt;wood&lt;/sub&gt;) accounted for almost all OC&lt;sub&gt;p&lt;/sub&gt; at the
suburban site in winter, allowing a new estimate of the ratio
TC&lt;sub&gt;p&lt;/sub&gt;/levoglucosan for both PM&lt;sub&gt;10&lt;/sub&gt; and PM&lt;sub&gt;2.5&lt;/sub&gt;. Particulate
carbonaceous material (PCM = Organic matter + Elemental matter) accounted
for 46–83% of PM&lt;sub&gt;10&lt;/sub&gt; at the sites studied when considering the
positive artefact of semi volatile OC, thus being the major contributor to
PM.</abstract>
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