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<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACPD</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics Discussions</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACPD</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7375</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/acpd-12-7453-2012</article-id>
<title-group>
<article-title>Global distribution and climate forcing of marine organic aerosol – Part 2: Effects on cloud properties and radiative forcing</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Gantt</surname>
<given-names>B.</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>Xu</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Meskhidze</surname>
<given-names>N.</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>Zhang</surname>
<given-names>Y.</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>Nenes</surname>
<given-names>A.</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 contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Ghan</surname>
<given-names>S. J.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Liu</surname>
<given-names>X.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Easter</surname>
<given-names>R.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Zaveri</surname>
<given-names>R.</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 Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Chinese Research Academy of Environment Sciences, No. 8 Dayangfang, Beiyuan, Chaoyang District, Beijing 100012, China</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Atmospheric Sciences &amp; Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>15</day>
<month>03</month>
<year>2012</year>
</pub-date>
<volume>12</volume>
<issue>3</issue>
<fpage>7453</fpage>
<lpage>7474</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>In the first part of this paper series (Meskhidze et al., 2011), a treatment
of marine organic aerosols (including primary organic aerosol, secondary
organic aerosols, and methane sulfonate) was implemented into the Community
Atmosphere Model version 5 (CAM5) with a 7-mode Modal Aerosol Module. A
series of simulations was conducted to quantify the changes in aerosol and
cloud condensation nuclei concentrations in the marine boundary layer. In
this study, changes in the cloud microphysical properties and radiative
forcing resulting from marine organic aerosols are assessed. Model
simulations show that the anthropogenic aerosol indirect forcing (AIF)
predicted by CAM5 is decreased in absolute magnitude by up to ~0.10 W m&lt;sup&gt;−2&lt;/sup&gt; (8%)
when marine organic aerosols are included. Changes in the
AIF from marine organic aerosols are associated with small global increases
in low-level in-cloud droplet number concentration and liquid water path of
~1.3 cm&lt;sup&gt;−3&lt;/sup&gt; (~1.6%) and 0.2 g m&lt;sup&gt;−2&lt;/sup&gt; (0.5%),
respectively. Areas especially sensitive to changes in cloud properties due
to marine organic aerosol include the Southern Ocean, North Pacific Ocean,
and North Atlantic Ocean, all of which are characterized by high marine
organic emission rates. As climate models are particularly sensitive to the
background aerosol concentration, this small but non-negligible change in
the AIF due to marine organic aerosols provides a notable link for
ocean-ecosystem marine low-level cloud interactions and may be a candidate
for consideration in future earth system models.</p>
</abstract>
<counts><page-count count="22"/></counts>
</article-meta>
</front>
<body/>
<back>
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