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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>10</volume_number>
		<issue_number>3</issue_number>
		<publication_year>2010</publication_year>
	</journal>
	<doi>10.5194/acpd-10-6713-2010</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/10/6713/2010/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/10/6713/2010/acpd-10-6713-2010.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/10/6713/2010/acpd-10-6713-2010.pdf</fulltext_pdf>
	<start_page>6713</start_page>
	<end_page>6754</end_page>
	<publication_date>2010-03-10</publication_date>
	<article_title content_type="html">Size distributions of dicarboxylic acids, ketoacids, &amp;alpha;-dicarbonyls, sugars, WSOC, OC, EC and inorganic ions in atmospheric particles over Northern Japan: implication for long-range transport of Siberian biomass burning and East Asian polluted aerosols</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>S. Agarwal</name>
		</author>
		<author numeration="2" affiliations="1,2">
			<name>S. G. Aggarwal</name>
		</author>
		<author numeration="3" affiliations="1,3">
			<name>K. Okuzawa</name>
		</author>
		<author numeration="4" affiliations="1">
			<name>K. Kawamura</name>
			<email>kawamura@lowtem.hokudai.ac.jp</email>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Institute of Low Temperature Science, Hokkaido University, Kita 19, Nishi 8, Sapporo – 0600819, Japan</affiliation>
		<affiliation numeration="2" content_type="html">now at: National Physical Laboratory (Council of Scientific and Industrial Research), Dr. K.S. Krishnan Road, New Delhi – 110012, India</affiliation>
		<affiliation numeration="3" content_type="html">now at: Japan Isotope Analysis Laboratory, Inc., 75-1 Onocho, Tsurumi-ku, Yokohama-city, Kanagawa 230-0046, Japan</affiliation>
	</affiliations>
	<abstract content_type="html">To better understand the size-segregated chemical composition of aged
organic aerosols in the western Pacific rim, day- and night-time aerosol
samples were collected in Sapporo, Japan during summer 2005 using Andersen
impactor sampler with 5 size bins: &amp;lt;1.1, 1.1–2.0, 2.0–3.3, 3.3–7.0,
&amp;gt;7.0 &amp;mu;m. Samples were analyzed for the molecular compositions of
dicarboxylic acids, ketoacids, &amp;alpha;-dicarbonyls, and sugars, together
with water-soluble organic carbon (WSOC), organic carbon (OC), elemental
carbon (EC) and inorganic ions. Based on the analyses of backward trajectory
and chemical tracers, we found that during campaign, the air masses were
arrived from Siberia (biomass burning source region) on 8–9 August, China
(anthropogenic source region) on 9–10 August and from the East China Sea/Sea
of Japan (a mixed source receptor region) on 10–11 August. Most of the
diacids, ketoacids, dicarbonyls, levoglucosan, WSOC, and inorganic ions,
i.e., SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;minus;&lt;/sup&gt;, NH&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2+&lt;/sup&gt; and K&lt;sup&gt;+&lt;/sup&gt; were enriched in fine
particles (PM&lt;sub&gt;1.1&lt;/sub&gt;) whereas Ca&lt;sup&gt;2+&lt;/sup&gt;, Mg&lt;sup&gt;2+&lt;/sup&gt; and Cl&lt;sup&gt;&amp;minus;&lt;/sup&gt; peaked in
coarse sizes (&amp;gt;1.1 &amp;mu;m). Interestingly, OC, most sugar compounds and
NO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&amp;minus;&lt;/sup&gt; showed bimodal distributions on fine and coarse modes.
In PM&lt;sub&gt;1.1&lt;/sub&gt;, diacids in biomass burning-influenced aerosols from Siberia
(mean: 252 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;) were more abundant than those in the aerosols from
China (209 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;) and ocean (142 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;) whereas SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;minus;&lt;/sup&gt;
concentrations maximized in the aerosols from China (mean: 3970 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;)
followed by marine- (2946 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;) and biomass burning-influenced
(1978 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;) aerosols. Higher loadings of WSOC (2428 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;) and OC
(4358 ng m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;) were found on the fine mode, where biomass-burning
products such as levoglucosan is abundant. This paper presents a case study
that biomass burning episodes in Siberian region have a significant
influence on the chemical composition of carbonaceous aerosols in the
western North Pacific rim.</abstract>
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