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<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics</journal_title>
		<journal_url>www.atmos-chem-phys.net</journal_url>
		<issn>1680-7316</issn>
		<eissn>1680-7324</eissn>
		<volume_number>7</volume_number>
		<issue_number>14</issue_number>
		<publication_year>2007</publication_year>
	</journal>
	<doi>10.5194/acp-7-3811-2007</doi>
	<article_url>http://www.atmos-chem-phys.net/7/3811/2007/</article_url>
	<abstract_html>http://www.atmos-chem-phys.net/7/3811/2007/acp-7-3811-2007.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys.net/7/3811/2007/acp-7-3811-2007.pdf</fulltext_pdf>
	<start_page>3811</start_page>
	<end_page>3821</end_page>
	<publication_date>2007-07-24</publication_date>
	<article_title content_type="html">Ozonolysis of α-pinene: parameterization of secondary organic aerosol mass fraction</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>R. K. Pathak</name>
		</author>
		<author numeration="2" affiliations="1">
			<name>A. A. Presto</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>T. E. Lane</name>
		</author>
		<author numeration="4" affiliations="2">
			<name>C. O. Stanier</name>
		</author>
		<author numeration="5" affiliations="1">
			<name>N. M. Donahue</name>
		</author>
		<author numeration="6" affiliations="1,3">
			<name>S. N. Pandis</name>
			<email>spyros@andrew.cmu.edu</email>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, USA</affiliation>
		<affiliation numeration="2" content_type="html">Chemical &amp; Biochemical Engineering and IIHR Hydroscience and Engineering Department, Univ. of Iowa, Iowa City, USA</affiliation>
		<affiliation numeration="3" content_type="html">Department of Chemical Engineering, University of Patras, Patra, Greece</affiliation>
	</affiliations>
	<abstract content_type="html">Existing parameterizations tend to underpredict the α-pinene aerosol
mass fraction (AMF) or yield by a factor of 2&amp;ndash;5 at low organic aerosol
concentrations (&amp;lt;5 &amp;micro;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;). A wide range of smog chamber results
obtained at various conditions (low/high NO&lt;sub&gt;x&lt;/sub&gt;, presence/absence of UV
radiation, dry/humid conditions, and temperatures ranging from 15&amp;ndash;40&amp;deg;C)
collected by various research teams during the last decade are used to
derive new parameterizations of the SOA formation from α-pinene
ozonolysis. Parameterizations are developed by fitting experimental data to
a basis set of saturation concentrations (from 10&lt;sup&gt;&amp;minus;2&lt;/sup&gt; to 10&lt;sup&gt;4&lt;/sup&gt; &amp;micro;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;)
using an absorptive equilibrium partitioning model. Separate
parameterizations for α-pinene SOA mass fractions are developed for:
1) Low NO&lt;sub&gt;x&lt;/sub&gt;, dark, and dry conditions, 2) Low NO&lt;sub&gt;x&lt;/sub&gt;, UV, and dry conditions, 3)
Low NO&lt;sub&gt;x&lt;/sub&gt;, dark, and high RH conditions, 4) High NO&lt;sub&gt;x&lt;/sub&gt;, dark, and dry
conditions, 5) High NO&lt;sub&gt;x&lt;/sub&gt;, UV, and dry conditions. According to the proposed
parameterizations the &amp;alpha;-pinene SOA mass fractions in an atmosphere
with 5 &amp;micro;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; of organic aerosol range from 0.032 to 0.1 for
reacted α-pinene concentrations in the 1 ppt to 5 ppb range.</abstract>
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</article>

