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<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics Discussions</journal_title>
		<journal_url>www.atmos-chem-phys-discuss.net</journal_url>
		<issn>1680-7367</issn>
		<eissn>1680-7375</eissn>
		<volume_number>9</volume_number>
		<issue_number>3</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/acpd-9-11699-2009</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/9/11699/2009/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/9/11699/2009/acpd-9-11699-2009.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/9/11699/2009/acpd-9-11699-2009.pdf</fulltext_pdf>
	<start_page>11699</start_page>
	<end_page>11751</end_page>
	<publication_date>2009-05-12</publication_date>
	<article_title content_type="html">Investigation of ship-plume chemistry using a newly-developed photochemical ship-plume model</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>H. S. Kim</name>
		</author>
		<author numeration="2" affiliations="1">
			<name>R. S. Park</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>C. H. Song</name>
			<email>chsong@gist.ac.kr</email>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea</affiliation>
	</affiliations>
	<abstract content_type="html">A photochemical ship-plume model, which can consider the ship-plume dynamics
and ship-plume chemistry, simultaneously, was developed to gain a better
understanding of atmospheric impact of ship emissions. The model performance
was then evaluated by a comparison with the observation data measured on a
NOAA WP-3D flight during the Intercontinental Transport and Chemical
Transformation 2002 (ITCT 2K2) airborne field campaign. The simulation
conditions and parameters, such as meteorological conditions, emission
rates, and background gas and particulate species concentrations, were
obtained directly and/or inferred indirectly from the ITCT 2K2 observation
data. The model-predicted concentrations showed good agreement with the
observed concentrations of five ambient species (NO&lt;sub&gt;x&lt;/sub&gt;, NO&lt;sub&gt;y&lt;/sub&gt;,
O&lt;sub&gt;3&lt;/sub&gt;, HNO&lt;sub&gt;3&lt;/sub&gt;, and H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;) at the eight plume transects by the
WP-3D flight with strong correlations around the 1:1 line (0.66&amp;le;&lt;i&gt;R&lt;/i&gt;&amp;le;0.85). In addition, a set of tests were carried out to approximate the
magnitude of the reaction probability of HNO&lt;sub&gt;3&lt;/sub&gt; onto sea-salt particles
in the model-observation comparison framework. These results suggest that
the reaction probability of HNO&lt;sub&gt;3&lt;/sub&gt; onto sea-salt particles may be in the
order of 10&lt;sup&gt;&amp;minus;3&lt;/sup&gt; or smaller. The equivalent NO&lt;sub&gt;x&lt;/sub&gt; lifetime throughout
the &quot;entire&quot; plume was also estimated from ship-plume chemistry modeling.
The NO&lt;sub&gt;x&lt;/sub&gt; lifetimes estimated throughout the &quot;entire ship plume&quot; was
3.36 h. The short NO&lt;sub&gt;x&lt;/sub&gt; lifetime over the entire ship plume clearly
shows that the ship-plume chemistry shortens the NO&lt;sub&gt;x&lt;/sub&gt; lifetime
considerably. Therefore, the ship-plume chemistry model should be used to
model the changes in ship-plume chemical compositions and better evaluate
the atmospheric impact of ocean-going ship emissions.</abstract>
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