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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-11-12649-2011</article-id>
<title-group>
<article-title>Possible catalytic effects of ice particles on the production of NO&lt;sub&gt;x&lt;/sub&gt; by lightning discharges</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Peterson</surname>
<given-names>H. 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>Beasley</surname>
<given-names>W. H.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>National Aeronautics and Space Administration, Marshall Space Flight Center, National Space Science and Technology Center, 320 Sparkman Drive, Huntsville, AL 35805, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>University of Oklahoma, School of Meteorology, 120 David L Boren Blvd Suite 5900, Norman, OK 73072, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>21</day>
<month>04</month>
<year>2011</year>
</pub-date>
<volume>11</volume>
<issue>4</issue>
<fpage>12649</fpage>
<lpage>12670</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>It is well known that lightning produces NO&lt;sub&gt;x&lt;/sub&gt; as a result of the high
temperatures in discharge channels. Since most viable proposed
electrification mechanisms involve ice crystals, it is reasonable to assume
that lightning discharge channels frequently pass through fields of ice
particles of various kinds. We address the question of whether ice crystals
may serve as catalysts for the production of NO&lt;sub&gt;x&lt;/sub&gt; by lightning
discharges. If so, and if the effect is large, it would need to be taken
into account in estimates of global NO&lt;sub&gt;x&lt;/sub&gt; production by lightning. In
this study, we make a series of plausible assumptions about the temperature
and concentration of reactant species in the environment of discharges and
we postulate a mechanism by which ice crystals are able to adsorb nitrogen
atoms. We then compare production rates between uncatalyzed and catalyzed
reactions at 2000 K, 3000 K, and 4000 K, which are reasonable temperatures
in lightning channels as they cool down. Catalyzed NO production rates are
greater at 2000 K, whereas uncatalyzed production rates are greater at 4000 K. This effect may be relevant to the question of the relative importance of
cloud-to-ground and in-cloud lightning for NO&lt;sub&gt;x&lt;/sub&gt; production.</p>
</abstract>
<counts><page-count count="22"/></counts>
</article-meta>
</front>
<body/>
<back>
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