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	<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>7</volume_number>
		<issue_number>1</issue_number>
		<publication_year>2007</publication_year>
	</journal>
	<doi>10.5194/acpd-7-3073-2007</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/7/3073/2007/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/7/3073/2007/acpd-7-3073-2007.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/7/3073/2007/acpd-7-3073-2007.pdf</fulltext_pdf>
	<start_page>3073</start_page>
	<end_page>3112</end_page>
	<publication_date>2007-02-27</publication_date>
	<article_title content_type="html">Fine aerosol bulk composition measured on WP-3D research aircraft in vicinity of the Northeastern United States &amp;ndash; results from NEAQS</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>R. E. Peltier</name>
			<email>rpeltier@eas.gatech.edu</email>
		</author>
		<author numeration="2" affiliations="1,4">
			<name>A. P. Sullivan</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>R. J. Weber</name>
		</author>
		<author numeration="4" affiliations="2">
			<name>C. A. Brock</name>
		</author>
		<author numeration="5" affiliations="2,3">
			<name>A. G. Wollny</name>
		</author>
		<author numeration="6" affiliations="2,3">
			<name>J. S. Holloway</name>
		</author>
		<author numeration="7" affiliations="2,3">
			<name>J. A. de Gouw</name>
		</author>
		<author numeration="8" affiliations="2,3">
			<name>C. Warneke</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA</affiliation>
		<affiliation numeration="2" content_type="html">National Oceanic and Atmospheric Administration, Earth Systems Research Laboratory, Boulder, CO, USA</affiliation>
		<affiliation numeration="3" content_type="html">Cooperative Institute for Research in Environmental Research, University of Colorado, Boulder, CO, USA</affiliation>
		<affiliation numeration="4" content_type="html">now at: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA</affiliation>
	</affiliations>
	<abstract content_type="html">During the New England Air Quality Study (NEAQS) in the summer of 2004,
airborne measurements were made of the major inorganic ions and the
water-soluble organic carbon (WSOC) of the submicron (PM&lt;sub&gt;1.0&lt;/sub&gt;) aerosol.
These and ancillary data are used to describe the overall aerosol chemical
characteristics encountered during the study. Fine particle mass was
estimated from particle volume and a calculated density based on measured
particle composition. Fine particle organic matter (OM) was estimated from
WSOC and a mass balance analysis. The aerosol over the northeastern United
States (U.S.) and Canada was predominately sulfate and associated ammonium,
and organic components, although in unique plumes additional ionic
components were also periodically above detection limits. In power
generation regions, and especially in the Ohio River Valley region, the
aerosol tended to be predominantly sulfate (~60% &amp;mu;g &amp;mu;g&lt;sup&gt;&amp;minus;1&lt;/sup&gt;) and apparently acidic, based on an excess of measured anions
compared to cations. In all other regions where sulfate concentrations were
lower and a smaller fraction of overall mass, the cations and anions were
balanced suggesting a more neutral aerosol. In contrast, the WSOC and
estimated OM were more spatially uniform and the fraction of OM relative to
PM mass largely influenced by sources of sulfate. The study median OM mass
fraction was 40%. Throughout the study region, sulfate and organic
aerosol mass were highest near the surface and decreased rapidly with
increasing altitude. The relative fraction of organic mass to sulfate was
similar within the boundary layer (altitude less than ~2.5 km), but
was significantly higher in the free troposphere (above ~2.5 km). A
number of distinct biomass burning plumes from fires in Alaska and the Yukon
were periodically intercepted, mostly at altitudes between 3 and 4 km. These
plumes were associated with highest aerosol concentrations of the study and
were largely comprised of organic aerosol components (~60%).</abstract>
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</article>

