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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>9</volume_number>
		<issue_number>2</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/acpd-9-6657-2009</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/9/6657/2009/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/9/6657/2009/acpd-9-6657-2009.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/9/6657/2009/acpd-9-6657-2009.pdf</fulltext_pdf>
	<start_page>6657</start_page>
	<end_page>6690</end_page>
	<publication_date>2009-03-10</publication_date>
	<article_title content_type="html">Regional differences in organic composition of submicron and single particles during INTEX-B 2006</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>D. A. Day</name>
		</author>
		<author numeration="2" affiliations="1">
			<name>S. Takahama</name>
		</author>
		<author numeration="3" affiliations="1,2">
			<name>S. G. Gilardoni</name>
		</author>
		<author numeration="4" affiliations="1">
			<name>L. M. Russell</name>
			<email>lmrussell@ucsd.edu</email>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Scripps Inst. of Oceanography, University of California, San Diego, La Jolla, California, USA</affiliation>
		<affiliation numeration="2" content_type="html">now at: European Commission, Institute for Environment and Sustainability, Ispra (VA), Italy</affiliation>
	</affiliations>
	<abstract content_type="html">Organic functional group and elemental concentrations were measured with
Fourier transform infrared (FTIR) spectroscopy and X-ray fluorescence (XRF)
from an aircraft platform as part of the Intercontinental Chemical Transport
Experiment – Phase B (INTEX-B) conducted over the Eastern Pacific and
Western North America. Single particle spectra were obtained using scanning
transmission X-ray microscopy-near edge X-ray absorption fine structure
spectrometry (STXM-NEXAFS). Organic mass (OM) concentrations ranged from 1 to
7 μg m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; and averaged 2.4–4.1 μg m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;. Alkane functional
groups were the largest fraction of OM, averaging 1.9–2.1 μg m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; or
50–76% of OM. Alcohol functional groups comprised the second largest
fraction of OM (0.35–0.39 μg m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;, 9–14%). Organic and elemental
concentrations are compared within and among geographical air mass regions:
&quot;Pacific&quot; free troposphere, &quot;Continental&quot; free troposphere, &quot;Seattle&quot;
metropolitan region, and the California &quot;Central Valley&quot;. OM concentrations
were highest and most variable in the Central Valley (3.5&amp;plusmn;2 μg m&lt;sup&gt;&amp;minus;3&lt;/sup&gt;).
Alcohol functional group concentrations were highest in the
Continental and Central Valley and lowest in the Pacific and Seattle air
masses. Oxygen-to-carbon ratios were relatively constant in the Central
Valley but variable for the Continental air masses. Most elemental
concentrations did not show large variations among or within air mass
categories. Overall, the OM concentrations showed greater variability within
air mass categories as compared to averages among them, suggesting sampled
air mass regions included a variety of sources, processing, and losses of
organic aerosol. Single particle spectra obtained by STXM-NEXAFS were
classified into metaclasses associated with different sources and atmospheric
processing. Particles with spectra indicative of secondary organic aerosol
production and combustion sources were found at several locations and a range
of altitudes. At lower altitudes, particles with spectra resembling soil dust
and biomass burning fingerprints were commonly observed. Single particle
spectra provided evidence that condensation and surface-limited oxidation
contributed to particle growth.</abstract>
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