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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-11-11993-2011</article-id>
<title-group>
<article-title>Transpacific transport of benzo[a]pyrene emitted from Asia</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Zhang</surname>
<given-names>Y.</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>Tao</surname>
<given-names>S.</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>Ma</surname>
<given-names>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>Simonich</surname>
<given-names>S.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Air Quality Research Division, Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, Ontario M3H 5T4, Canada</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Department of Chemistry, Oregon State University, Corvallis, Oregon, USA</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon, USA</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>now at: Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>02</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>11</volume>
<issue>23</issue>
<fpage>11993</fpage>
<lpage>12006</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>
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<abstract>
<p>A global-scale three dimensional atmospheric transport and chemistry model
was applied to simulate transpacific transport of Benzo[a]pyrene (BaP)
emitted from Asia. The model results were compared with observations at six
monitoring sites. The annual mean and seasonal variation of transport
patterns and the contributions of different Asian source regions to
transpacific transport flux were investigated. The episodic nature of
transpacific transport was also systematically explored. Interannual
variability of transpacific transport of BaP was also assessed during the
period of 1948–2007. Results showed that strong enhancements of modeled BaP
occurred in an area bounded by 70–80° E and 100–120° E. Air
containing these elevated BaP concentrations was then delivered eastward by
westerly winds. When approaching the West Coast of North America, the
descending atmospheric motion carried BaP-laden air into the lower
atmosphere. The transpacific transport flux was 1.6 times higher in the
winter than in the summer. East Asian emission dominates the transpacific
transport flux with a contribution of about 97%. Near ground
concentration of BaP induced by Asian sources in North America varied
between 1–20 pg m&lt;sup&gt;−3&lt;/sup&gt;. A case study for observation at Cheeka Peak
Observatory during March 2002–May 2002 reveals the importance of warm
conveyor belt for transpacific transport. The number of days with
transpacific transport flux with a factor of 0.5, 1.0, 1.5, and 2.0 larger
than the running mean were 9.4%, 0.72%, 0.06% and 0.01%,
respectively, implying a mild contribution of episodic transport to the
long-term mean transport flux. Significant interannual fluctuation of
transpacific transport of BaP was found, including a general decreasing
trend during 1948–2007, and especially after the 1970s. The transpacific
transport was found to be positively correlated with the Southern
Oscillation Index.</p>
</abstract>
<counts><page-count count="14"/></counts>
</article-meta>
</front>
<body/>
<back>
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