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<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>
</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-9-6611-2009</article-id>
<title-group>
<article-title>The impact of MM5 and WRF meteorology over complex terrain on CHIMERE model calculations</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>de Meij</surname>
<given-names>A.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Gzella</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>Cuvelier</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>Thunis</surname>
<given-names>P.</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>Bessagnet</surname>
<given-names>B.</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>Vinuesa</surname>
<given-names>J. F.</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>Menut</surname>
<given-names>L.</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>Kelder</surname>
<given-names>H. M.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>European Commission – DG Joint Research Centre, Institute for Environment and Sustainability, 21020 Ispra, Italy</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>INERIS, Institut National de l&apos;Environnement industriel et des Risques, Parc Technologique ALATA, 60550 Verneuil-en-Halatte, France</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Laboratoire de Météorologie Dynamique, Institut Pierre-Simon Laplace, Ecole Polytechnique, Palaiseau, France</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>now at: Energy, Environment and Water Research Centre, The Cyprus Institute, 20 Kavafi Street, 1645, Nicosia, Cyprus</addr-line>
</aff>
<pub-date pub-type="epub">
<day>11</day>
<month>09</month>
<year>2009</year>
</pub-date>
<volume>9</volume>
<issue>17</issue>
<fpage>6611</fpage>
<lpage>6632</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.net/9/6611/2009/acp-9-6611-2009.html">This article is available from http://www.atmos-chem-phys.net/9/6611/2009/acp-9-6611-2009.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys.net/9/6611/2009/acp-9-6611-2009.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/6611/2009/acp-9-6611-2009.pdf</self-uri>
<abstract>
<p>The objective of this study is to evaluate the impact of meteorological
input data on calculated gas and aerosol concentrations. We use two
different meteorological models (MM5 and WRF) together with the chemistry
transport model CHIMERE. We focus on the Po valley area (Italy) for January
and June 2005.
&lt;br&gt;&lt;br&gt;
Firstly we evaluate the meteorological parameters with observations. The
analysis shows that the performance of both models in calculating surface
parameters is similar, however differences are still observed.
&lt;br&gt;&lt;br&gt;
Secondly, we analyze the impact of using MM5 and WRF on calculated PM&lt;sub&gt;10&lt;/sub&gt; and
O&lt;sub&gt;3&lt;/sub&gt; concentrations. In general CHIMERE/MM5 and CHIMERE/WRF underestimate
the PMv concentrations for January. The difference in PM&lt;sub&gt;10&lt;/sub&gt; concentrations
for January between CHIMERE/MM5 and CHIMERE/WRF is around a factor 1.6 (PM&lt;sub&gt;10&lt;/sub&gt;
higher for CHIMERE/MM5). This difference and the larger underestimation in
PM&lt;sub&gt;10&lt;/sub&gt; concentrations by CHIMERE/WRF are related to the differences in heat
fluxes and the resulting PBL heights calculated by WRF. In general the PBL
height by WRF meteorology is a factor 2.8 higher at noon in January than
calculated by MM5. This study showed that the difference in microphysics
scheme has an impact on the profile of cloud liquid water (CLW) calculated
by the meteorological driver and therefore on the production of SO&lt;sub&gt;4&lt;/sub&gt;
aerosol.
&lt;br&gt;&lt;br&gt;
A sensitivity analysis shows that changing the Noah Land Surface Model (LSM)
in our WRF pre-processing for the 5-layer soil temperature model,
calculated monthly mean PMv concentrations increase by 30%, due to the
change in the heat fluxes and the resulting PBL heights.
&lt;br&gt;&lt;br&gt;
For June, PM&lt;sub&gt;10&lt;/sub&gt; calculated concentrations by CHIMERE/MM5 and CHIMERE/WRF are
similar and agree with the observations. Calculated O&lt;sub&gt;3&lt;/sub&gt; values for June
are in general overestimated by a factor 1.3 by CHIMERE/MM5 and CHIMERE/WRF.
High temporal correlations are found between modeled and observed O&lt;sub&gt;3&lt;/sub&gt;
concentrations.</p>
</abstract>
<counts><page-count count="22"/></counts>
</article-meta>
</front>
<body/>
<back>
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