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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-10-7185-2010</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/10/7185/2010/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/10/7185/2010/acpd-10-7185-2010.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/10/7185/2010/acpd-10-7185-2010.pdf</fulltext_pdf>
	<start_page>7185</start_page>
	<end_page>7214</end_page>
	<publication_date>2010-03-17</publication_date>
	<article_title content_type="html">HULIS in emissions of fresh rice straw burning and in ambient aerosols in the pearl river delta region, China</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>P. Lin</name>
		</author>
		<author numeration="2" affiliations="2">
			<name>G. Engling</name>
		</author>
		<author numeration="3" affiliations="1,3,4">
			<name>J. Z. Yu</name>
			<email>chjianyu@ust.hk</email>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China</affiliation>
		<affiliation numeration="2" content_type="html">Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan</affiliation>
		<affiliation numeration="3" content_type="html">Department of Chemistry, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China</affiliation>
		<affiliation numeration="4" content_type="html">Atmospheric Research Center, HKUST Fok Ying Tung Graduate School, Nansha, Guangzhou 511458, China</affiliation>
	</affiliations>
	<abstract content_type="html">HUmic-LIke Substances (HULIS) are an abundant unresolved mixture of organic
compounds present in atmospheric samples. Biomass burning (BB) has been
recognized as an important primary source of HULIS, but measurements of
HULIS in various fresh BB particles are lacking. In this work, HULIS in
emissions of rice straw burning in a number of field and chamber experiments
was measured. The HULIS/OC ratio was 0.34&amp;plusmn;0.05 in &amp;mu;g/&amp;mu;gC,
showing small variance among emissions under different burning conditions.
The influence of BB on ambient HULIS levels was investigated by examining
the spatial and temporal variation of HULIS and other aerosol constituents
and interspecies relations in ambient PM&lt;sub&gt;2.5&lt;/sub&gt; collected at an urban and a
suburban location in the Pearl River Delta (PRD), China over a period of one
year. The HULIS concentrations in the ambient PM&lt;sub&gt;2.5&lt;/sub&gt; were significantly
higher in air masses originating from regions influenced by BB. Significant
correlations between HULIS and water-soluble K&lt;sup&gt;+&lt;/sup&gt; concentrations at both
sites further support that BB was an important source of HULIS. HULIS also
correlated well with sulfate, oxalate, and oxidant (the sum of O&lt;sub&gt;3&lt;/sub&gt; and
NO&lt;sub&gt;2&lt;/sub&gt;). The HULIS/OC ratios in BB-influenced ambient aerosols (~0.6) were much higher than those in the fresh BB emissions (0.34), implying
that secondary formation was also an important source of HULIS in the
atmosphere. The annual average HULIS concentrations were 4.9 &amp;mu;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; at the urban site and 7.1 &amp;mu;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; at the suburban site
while the annual average concentrations of elemental carbon were
3.3 &amp;mu;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; and 2.4 &amp;mu;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;, respectively. The urban-suburban spatial
gradient of HULIS was opposite to that of elemental carbon, negating
vehicular emissions as a significant source of HULIS.</abstract>
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