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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>GÃ¶ttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-12-1737-2012</article-id>
<title-group>
<article-title>Impact of lightning-NO on eastern United States photochemistry during the summer of 2006 as determined using the CMAQ model</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Allen</surname>
<given-names>D. 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>Pickering</surname>
<given-names>K. E.</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>Pinder</surname>
<given-names>R. W.</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>Henderson</surname>
<given-names>B. H.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Appel</surname>
<given-names>K. W.</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>Prados</surname>
<given-names>A.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Atmospheric Chemistry and Dynamics Laboratory, Code 614 NASA-Goddard, Greenbelt, MD, USA</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Atmospheric Modeling and Analysis Division, US EPA, Research Triangle Park, NC, USA</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>University of North Carolina Chapel Hill, NC, USA</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Joint Center for Earth Sciences Technology (JCET), University of Maryland Baltimore County, Baltimore, MD, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>16</day>
<month>02</month>
<year>2012</year>
</pub-date>
<volume>12</volume>
<issue>4</issue>
<fpage>1737</fpage>
<lpage>1758</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/12/1737/2012/acp-12-1737-2012.html">This article is available from http://www.atmos-chem-phys.net/12/1737/2012/acp-12-1737-2012.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys.net/12/1737/2012/acp-12-1737-2012.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/1737/2012/acp-12-1737-2012.pdf</self-uri>
<abstract>
<p>A lightning-nitrogen oxide (NO) algorithm is implemented in the Community
Multiscale Air Quality Model (CMAQ) and used to evaluate the impact of
lightning-NO emissions (LNO&lt;sub&gt;x&lt;/sub&gt;) on tropospheric photochemistry over the
United States during the summer of 2006.
&lt;br&gt;&lt;br&gt;
For a 500 mole per flash lightning-NO source, the mean summertime
tropospheric NO&lt;sub&gt;2&lt;/sub&gt; column agrees with satellite-retrieved columns to
within âˆ’5 to +13%. Temporal fluctuations in the column are moderately
well simulated; however, the addition of LNO&lt;sub&gt;x&lt;/sub&gt; does not lead to a better
simulation of day-to-day variability. The contribution of lightning-NO to
the model column ranges from &amp;sim;10% in the northern US to &gt;45%
in the south-central and southeastern US. Lightning-NO adds up to 20 ppbv to
upper tropospheric model ozone and 1.5â€“4.5 ppbv to 8-h maximum surface
layer ozone, although, on average, the contribution of LNO&lt;sub&gt;x&lt;/sub&gt; to model
surface ozone is 1â€“2 ppbv less on poor air quality days. LNO&lt;sub&gt;x&lt;/sub&gt; increases
wet deposition of oxidized nitrogen by 43% and total deposition of
nitrogen by 10%. This additional deposition reduces the mean magnitude of
the CMAQ low-bias in nitrate wet deposition with respect to National
Atmospheric Deposition monitors to near zero.
&lt;br&gt;&lt;br&gt;
Differences in urban/rural biases between model and satellite-retrieved
NO&lt;sub&gt;2&lt;/sub&gt; columns were examined to identify possible problems in model
chemistry and/or transport. CMAQ columns were too large over urban areas.
Biases at other locations were minor after accounting for the impacts of
lightning-NO emissions and the averaging kernel on model columns.
&lt;br&gt;&lt;br&gt;
In order to obtain an upper bound on the contribution of uncertainties in
NO&lt;sub&gt;y&lt;/sub&gt; chemistry to upper tropospheric NO&lt;sub&gt;x&lt;/sub&gt; low biases, sensitivity
calculations with updated chemistry were run for the time period of the
Intercontinental Chemical Transport Experiment (INTEX-A) field campaign
(summer 2004). After adjusting for possible interferences in NO&lt;sub&gt;2&lt;/sub&gt;
measurements and averaging over the entire campaign, these updates reduced
7â€“9 km biases from 32 to 17% and 9â€“12 km biases from 57 to 46%. While
these changes lead to better agreement, a considerable unexplained NO&lt;sub&gt;2&lt;/sub&gt;
low-bias remains in the uppermost troposphere.</p>
</abstract>
<counts><page-count count="22"/></counts>
</article-meta>
</front>
<body/>
<back>
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