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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-11-6063-2011</article-id>
<title-group>
<article-title>Improvement and evaluation of simulated global biogenic soil NO emissions in an AC-GCM</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Steinkamp</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Lawrence</surname>
<given-names>M. G.</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-group><aff id="aff1">
<label>1</label>
<addr-line>Max-Planck-Institute for Chemistry, Department of Atmospheric Chemistry, Mainz, Germany</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>University of Mainz, Institute for Physics of the Atmosphere, Mainz, Germany</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>now at: LOEWE – Biodiversity and Climate Research Centre (BiK-F), Frankfurt/Main, Germany</addr-line>
</aff>
<pub-date pub-type="epub">
<day>28</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>11</volume>
<issue>12</issue>
<fpage>6063</fpage>
<lpage>6082</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/11/6063/2011/acp-11-6063-2011.html">This article is available from http://www.atmos-chem-phys.net/11/6063/2011/acp-11-6063-2011.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys.net/11/6063/2011/acp-11-6063-2011.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/6063/2011/acp-11-6063-2011.pdf</self-uri>
<abstract>
<p>Biogenic NO emissions from soils (SNO&lt;sub&gt;x&lt;/sub&gt;) play important direct and indirect
  roles in tropospheric chemistry. The most widely applied algorithm to
  calculate SNO&lt;sub&gt;x&lt;/sub&gt; in global models was published 15 years ago by Yienger and Levy
(1995), and was based on very few measurements. Since then, numerous new measurements
  have been published, which we used to build up a compilation of world wide
  field measurements covering the period from 1978 to 2010. Recently, several
  satellite-based top-down approaches, which recalculated the different sources
  of NO&lt;sub&gt;x&lt;/sub&gt; (fossil fuel, biomass burning, soil and lightning), have shown an
  underestimation of SNO&lt;sub&gt;x&lt;/sub&gt; by the algorithm of Yienger and Levy
  (1995). Nevertheless, to our knowledge no general improvements of this
  algorithm, besides suggested scalings of the total source magnitude, have yet
  been published. Here we present major improvements to the algorithm, which
  should help to optimize the representation of SNO&lt;sub&gt;x&lt;/sub&gt; in atmospheric-chemistry
  global climate models, without modifying the underlying principals or
  mathematical equations. The changes include: (1) using a new landcover map,
  with twice the number of landcover classes, and using annually varying
  fertilizer application rates; (2) adopting a fraction of 1.0 % for the applied
  fertilizer lost as NO, based on our compilation of measurements; (3) using the
  volumetric soil moisture to distinguish between the wet and dry states; and
  (4) adjusting the emission factors to reproduce the measured emissions in our
  compilation (based on either their geometric or arithmetic mean
  values). These steps lead to increased global annual SNO&lt;sub&gt;x&lt;/sub&gt;, and our total
  above canopy SNO&lt;sub&gt;x&lt;/sub&gt; source of 8.6 Tg yr&lt;sup&gt;−1&lt;/sup&gt; (using the geometric mean)
  ends up being close to one of the satellite-based top-down approaches (8.9 Tg yr&lt;sup&gt;−1&lt;/sup&gt;). 
The above canopy SNO&lt;sub&gt;x&lt;/sub&gt; source using the arithmetic mean
  is 27.6 Tg yr&lt;sup&gt;−1&lt;/sup&gt;, which is higher than all previous estimates, but
  compares better with a regional top-down study in eastern China. This
  suggests that both top-down and bottom-up approaches will be needed in future
  attempts to provide a better calculation of SNO&lt;sub&gt;x&lt;/sub&gt;.</p>
</abstract>
<counts><page-count count="20"/></counts>
</article-meta>
</front>
<body/>
<back>
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