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<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">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-12-10381-2012</article-id>
<title-group>
<article-title>Summer ammonia measurements in a densely populated Mediterranean city</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Pandolfi</surname>
<given-names>M.</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>Amato</surname>
<given-names>F.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Reche</surname>
<given-names>C.</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>Alastuey</surname>
<given-names>A.</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>Otjes</surname>
<given-names>R. P.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Blom</surname>
<given-names>M. J.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Querol</surname>
<given-names>X.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Institute of Environmental Assessment and Water Research  (IDAEA-CSIC), Barcelona, Spain</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>TNO, Built Environment and Geosciences, Dept. of Air Quality and  Climate, Utrecht,  The Netherlands</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Energy Research Centre of the Netherlands, Department of  Environmental Assessment, Petten, The Netherlands</addr-line>
</aff>
<pub-date pub-type="epub">
<day>20</day>
<month>04</month>
<year>2012</year>
</pub-date>
<volume>12</volume>
<issue>4</issue>
<fpage>10381</fpage>
<lpage>10424</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>
<self-uri xlink:href="http://www.atmos-chem-phys-discuss.net/12/10381/2012/acpd-12-10381-2012.html">This article is available from http://www.atmos-chem-phys-discuss.net/12/10381/2012/acpd-12-10381-2012.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys-discuss.net/12/10381/2012/acpd-12-10381-2012.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/12/10381/2012/acpd-12-10381-2012.pdf</self-uri>
<abstract>
<p>Real-time measurements of ambient concentrations of gas-phase ammonia were
  performed in Barcelona (NE Spain) in summer between May and
  September 2011. Two measurement sites were selected: one in an urban
  background traffic-influenced area (UB) and the other in the
  historical city centre (CC). Levels of ammonia were higher at CC
  (5.6 &amp;pm; 2.1 &amp;mu;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; or 7.5 &amp;pm; 2.8 ppbv)
  compared with UB (2.2 &amp;pm; 1.0 &amp;mu;g m&lt;sup&gt;&amp;minus;3&lt;/sup&gt; or 2.9 &amp;pm;
  1.3 ppbv). This difference is attributed to the
  contribution from non-traffic sources such as waste containers,
  sewage systems, humans and open markets more dense in the densely
  populated historical city centre.  Under high temperatures in summer
  these sources had the potential to increase the ambient levels of
  ammonia well above the urban-background-traffic-influenced UB
  measurement station. Measurements were used to assess major local
  emissions, sinks and diurnal evolution of NH&lt;sub&gt;3&lt;/sub&gt;. The measured
  levels of NH&lt;sub&gt;3&lt;/sub&gt;, especially high in the old city, may
  contribute to the high mean annual concentrations of secondary
  sulfate and nitrate measured in Barcelona compared with other cities
  in Spain affected by high traffic intensity. Ancillary measurements,
  including PM&lt;sub&gt;10&lt;/sub&gt;, PM&lt;sub&gt;2.5&lt;/sub&gt;, PM&lt;sub&gt;1&lt;/sub&gt; levels
  (Particulate Matter with aerodynamic diameter smaller than
  10 &amp;mu;m, 2.5 &amp;mu;m, and 1 &amp;mu;m), gases and
  black carbon concentrations and meteorological data, were performed
  during the measurement campaign. The analysis of specific periods (3
  special cases) during the campaign revealed that road traffic was
  a significant source of NH&lt;sub&gt;3&lt;/sub&gt;. However, its effect was more
  evident at UB compared with CC where it was masked given the high
  levels of NH&lt;sub&gt;3&lt;/sub&gt; from non-traffic sources measured in the old
  city. The relationship between SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;minus;&lt;/sup&gt; daily concentrations
  and gas-fraction ammonia (NH&lt;sub&gt;3&lt;/sub&gt;/(NH&lt;sub&gt;3&lt;/sub&gt;+NH&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;+&lt;/sup&gt;))
  revealed that the gas-to-phase partitioning (volatilization or
  ammonium salts formation) also played an important role in the
  evolution of NH&lt;sub&gt;3&lt;/sub&gt; concentration in summer in Barcelona.</p>
</abstract>
<counts><page-count count="44"/></counts>
</article-meta>
</front>
<body/>
<back>
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