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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>
<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 Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-14-9925-2014</article-id>
<title-group>
<article-title>Aviation 2006 NO&lt;sub&gt;x&lt;/sub&gt;-induced effects on atmospheric ozone and HO&lt;sub&gt;x&lt;/sub&gt; in Community Earth System Model (CESM)</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Khodayari</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>Tilmes</surname>
<given-names>S.</given-names>
<ext-link>https://orcid.org/0000-0002-6557-3569</ext-link>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Olsen</surname>
<given-names>S. C.</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>Phoenix</surname>
<given-names>D. 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>Wuebbles</surname>
<given-names>D. J.</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>Lamarque</surname>
<given-names>J.-F.</given-names>
<ext-link>https://orcid.org/0000-0002-4225-5074</ext-link>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Chen</surname>
<given-names>C.-C.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>National Center for Atmospheric Research, Boulder, CO, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>19</day>
<month>09</month>
<year>2014</year>
</pub-date>
<volume>14</volume>
<issue>18</issue>
<fpage>9925</fpage>
<lpage>9939</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2014 A. Khodayari et al.</copyright-statement>
<copyright-year>2014</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://acp.copernicus.org/articles/14/9925/2014/acp-14-9925-2014.html">This article is available from https://acp.copernicus.org/articles/14/9925/2014/acp-14-9925-2014.html</self-uri>
<self-uri xlink:href="https://acp.copernicus.org/articles/14/9925/2014/acp-14-9925-2014.pdf">The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/9925/2014/acp-14-9925-2014.pdf</self-uri>
<abstract>
<p>The interaction between atmospheric chemistry and ozone (O&lt;sub&gt;3&lt;/sub&gt;) in the
upper troposphere–lower stratosphere (UTLS) presents a major uncertainty
in understanding the effects of aviation on climate. In this study, two
configurations of the atmospheric model from the Community Earth System
Model (CESM), Community Atmosphere Model with Chemistry,
Version 4 (CAM4) and Version 5 (CAM5), are used to evaluate the effects of aircraft
nitrogen oxide (NO&lt;sub&gt;x&lt;/sub&gt; = NO + NO&lt;sub&gt;2&lt;/sub&gt;) emissions on ozone and the background
chemistry in the UTLS. CAM4 and CAM5 simulations were both performed with
extensive tropospheric and stratospheric chemistry including 133 species and
330 photochemical reactions. CAM5 includes direct and indirect aerosol
effects on clouds using a modal aerosol module (MAM), whereby CAM4 uses a
bulk aerosol module, which can only simulate the direct effect. To examine
the accuracy of the aviation NO&lt;sub&gt;x&lt;/sub&gt;-induced ozone distribution in the two
models, results from the CAM5 and CAM4 simulations are compared to
ozonesonde data. Aviation NO&lt;sub&gt;x&lt;/sub&gt; emissions for 2006 were obtained from the AEDT
(Aviation Environmental Design Tool) global commercial aircraft emissions
inventory. Differences between simulated O&lt;sub&gt;3&lt;/sub&gt; concentrations and
ozonesonde measurements averaged at representative levels in the troposphere
and different regions are 13% in CAM5 and 18% in CAM4. Results show a
localized increase in aviation-induced O&lt;sub&gt;3&lt;/sub&gt; concentrations at aviation
cruise altitudes that stretches from 40° N to the North Pole. The
results indicate a greater and more disperse production of aviation
NO&lt;sub&gt;x&lt;/sub&gt;-induced ozone in CAM5, with the annual tropospheric mean O&lt;sub&gt;3&lt;/sub&gt;
perturbation of 1.2 ppb (2.4%) for CAM5 and 1.0 ppb (1.9%) for CAM4.
The annual mean O&lt;sub&gt;3&lt;/sub&gt; perturbation peaks at about 8.2 ppb (6.4%) and
8.8 ppb (5.2%) in CAM5 and CAM4, respectively. Aviation emissions also
result in increased hydroxyl radical (OH) concentrations and methane (CH&lt;sub&gt;4&lt;/sub&gt;) loss rates,
reducing the tropospheric methane lifetime in CAM5 and CAM4 by 1.69 and
1.40%, respectively. Aviation NO&lt;sub&gt;x&lt;/sub&gt; emissions are associated with an
instantaneous change in global mean short-term O&lt;sub&gt;3&lt;/sub&gt; radiative forcing
(RF) of 40.3 and 36.5 mWm&lt;sup&gt;−2&lt;/sup&gt; in CAM5 and CAM4, respectively.</p>
</abstract>
<counts><page-count count="15"/></counts>
</article-meta>
</front>
<body/>
<back>
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