<?xml version="1.0" ?><!DOCTYPE article PUBLIC '-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN' 'http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd'><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" article-type="research-article" dtd-version="3.0" xml:lang="en">
<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACP</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACP</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">Atmos. Chem. Phys.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7324</issn>
<publisher> <publisher-name>Copernicus GmbH</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-14-2383-2014</article-id>
<title-group>
<article-title>Emission factor ratios, SOA mass yields, and the impact of vehicular emissions on SOA formation</article-title>
</title-group>
<contrib-group> <contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Ensberg</surname>
<given-names>J. J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Hayes</surname>
<given-names>P. L.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff8">
<sup>8</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Jimenez</surname>
<given-names>J. L.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Gilman</surname>
<given-names>J. B.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Kuster</surname>
<given-names>W. C.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>de Gouw</surname>
<given-names>J. A.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Holloway</surname>
<given-names>J. S.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Gordon</surname>
<given-names>T. D.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
<xref ref-type="aff" rid="aff9">
<sup>9</sup>
</xref>
<xref ref-type="aff" rid="aff10">
<sup>10</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Jathar</surname>
<given-names>S.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
<xref ref-type="aff" rid="aff11">
<sup>11</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Robinson</surname>
<given-names>A. L.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"> <name name-style="western"> <surname>Seinfeld</surname>
<given-names>J. H.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
</contrib>
</contrib-group> <aff id="aff1">
<label>1</label>
<addr-line>Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>National Oceanic and Atmospheric Administration Earth System Research Laboratory, Chemical Sciences Division, 325 Broadway, Boulder, CO 80304, USA</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA 15213, USA</addr-line>
</aff>
<aff id="aff6">
<label>6</label>
<addr-line>Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, PA 15213, USA</addr-line>
</aff>
<aff id="aff7">
<label>7</label>
<addr-line>Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA</addr-line>
</aff>
<aff id="aff8">
<label>8</label>
<addr-line>now at: Department of Chemistry, University of Montreal, Montreal, Quebec, Canada</addr-line>
</aff>
<aff id="aff9">
<label>9</label>
<addr-line>now at: National Oceanic and Atmospheric Administration Earth System Research Laboratory, Chemical Sciences Division, 325 Broadway, Boulder, CO 80304, USA</addr-line>
</aff>
<aff id="aff10">
<label>10</label>
<addr-line>now at: Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA</addr-line>
</aff>
<aff id="aff11">
<label>11</label>
<addr-line>now at: Department of Civil and Environmental Engineering, University of California at Davis, Davis, CA, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>07</day>
<month>03</month>
<year>2014</year>
</pub-date>
<volume>14</volume>
<issue>5</issue>
<fpage>2383</fpage>
<lpage>2397</lpage>
<permissions>
<license license-type="open-access">
<license-p> This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/3.0/">http://creativecommons.org/licenses/by/3.0/</ext-link> </license-p>
</license>
</permissions>
<self-uri xlink:href="http://www.atmos-chem-phys.net/14/2383/2014/acp-14-2383-2014.html">This article is available from http://www.atmos-chem-phys.net/14/2383/2014/acp-14-2383-2014.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys.net/14/2383/2014/acp-14-2383-2014.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys.net/14/2383/2014/acp-14-2383-2014.pdf</self-uri>
<abstract>
<p>The underprediction of ambient secondary organic aerosol (SOA) levels by
current atmospheric models in urban areas is well established, yet the cause
of this underprediction remains elusive. Likewise, the relative contribution
of emissions from gasoline- and diesel-fueled vehicles to the formation of
SOA is generally unresolved. We investigate the source of these two
discrepancies using data from the 2010 CalNex experiment carried out in the
Los Angeles Basin (Ryerson et al., 2013). Specifically, we use gas-phase
organic mass (GPOM) and CO emission factors in conjunction with measured
enhancements in oxygenated organic aerosol (OOA) relative to CO to quantify
the significant lack of closure between expected and observed organic aerosol
concentrations attributable to fossil-fuel emissions. Two possible
conclusions emerge from the analysis to yield consistency with the ambient
data: (1) vehicular emissions are not a dominant source of anthropogenic
fossil SOA in the Los Angeles Basin, or (2) the ambient SOA mass yields used
to determine the SOA formation potential of vehicular emissions are substantially
higher than those derived from laboratory chamber studies.</p>
</abstract>
<counts> <page-count count="15"/> </counts>
</article-meta>
</front>
<body/>
<back>
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