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<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACPD</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics Discussions</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACPD</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7375</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/acpd-11-5043-2011</article-id>
<title-group>
<article-title>Urban organic aerosols measured by single particle mass spectrometry in the megacity of London</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Dall&apos;Osto</surname>
<given-names>M.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Harrison</surname>
<given-names>R. M.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>National Centre for Atmospheric Science, Division of Environmental Health &amp; Risk Management, School of Geography, Earth &amp; Environmental Sciences University of Birmingham Edgbaston, Birmingham B15 2TT, UK</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>now at: Institute of Environmental Assessment and Water Research (IDǼA) Consejo Superior de Investigaciones Científicas (CSIC) C/LLuis Solé i Sabarís S/N 08028 Barcelona, Spain</addr-line>
</aff>
<pub-date pub-type="epub">
<day>10</day>
<month>02</month>
<year>2011</year>
</pub-date>
<volume>11</volume>
<issue>2</issue>
<fpage>5043</fpage>
<lpage>5078</lpage>
<permissions>
<license xlink:type="simple">
<license-p>This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
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<abstract>
<p>During the month of October 2006, as part of the
REPARTEE-I experiment (Regent&apos;s Park and Tower Environmental Experiment) an
Aerosol Time-Of-Flight Mass Spectrometer (ATOFMS) was deployed at an urban
background location in the city of London, UK. Fifteen particle types were
classified, some of which were accompanied by Aerosol Mass Spectrometer
(AMS) quantitative aerosol mass loading measurements (Dall&apos;Osto et al.,
2009a, b). In this manuscript the origins and properties of four particle
types associated with locally generated aerosols, independent of the air
mass type advected into London, are examined. One particle type, originating
from lubricating oil (referred to as Ca-EC), was associated with morning
rush hour traffic emissions. A second particle type, composed of both
inorganic and organic species (called Na-EC-OC), was found enhanced in
particle number concentration during evening time periods, and is likely to
originate from a source operating at this time of day, or more probably from
condensation of semi-volatile species, and contains both primary and
secondary components. A third class, internally mixed with organic carbon
and sulphate (called OC), was found to spike both in the morning and
evenings. The fourth class (SOA-PAH) exhibited maximum frequency during the
warmest part of the day, and a number of factors point towards secondary
production from traffic-related volatile aromatic compounds. Single particle
mass spectra of this particle type showed an oxidized polycyclic aromatic
compound signature. Finally, a comparison of ATOFMS particle class data is
made with factors obtained by Positive Matrix Factorization from AMS data..
Both the Ca-EC and OC particle types correlate with the AMS HOA primary
organic fraction (&lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt; = 0.65 and 0.50 respectively), and Na-EC-OC, but not
SOA-PAH, which correlates weakly with the AMS OOA secondary organic aerosol
factor (&lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt; = 0.35). A detailed analysis was conducted to identify ATOFMS
particle type(s) representative of the AMS COA cooking aerosol factor, but
no convincing associations were found.</p>
</abstract>
<counts><page-count count="36"/></counts>
</article-meta>
</front>
<body/>
<back>
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