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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>8</volume_number>
		<issue_number>2</issue_number>
		<publication_year>2008</publication_year>
	</journal>
	<doi>10.5194/acpd-8-6603-2008</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/8/6603/2008/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/8/6603/2008/acpd-8-6603-2008.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/8/6603/2008/acpd-8-6603-2008.pdf</fulltext_pdf>
	<start_page>6603</start_page>
	<end_page>6651</end_page>
	<publication_date>2008-04-04</publication_date>
	<article_title content_type="html">Evaluation of a new lightning-produced NO&lt;sub&gt;x&lt;/sub&gt; parameterization for cloud resolving models and its associated uncertainties</article_title>
	<authors>
		<author numeration="1" affiliations="1,2">
			<name>C. Barthe</name>
			<email>christelle.barthe@aero.obs-mip.fr</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>M. C. Barth</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">National Center for Atmospheric Research, Boulder, CO, USA</affiliation>
		<affiliation numeration="2" content_type="html">now at: Laboratoire d&apos;Aérologie, CNRS/Université Paul Sabatier, Toulouse, France</affiliation>
	</affiliations>
	<abstract content_type="html">A new parameterization of the lightning-produced NO&lt;sub&gt;x&lt;/sub&gt; has been developed for cloud-resolving models.
This parameterization is based on three unique characteristics.
First, the cells that can produce lightning are identified using a vertical velocity threshold.
Second, the flash rate in each cell is estimated from the non-precipitation and precipitation ice mass flux product.
Third, the source location is filamentary instead of volumetric as in previous parameterizations.

&lt;br&gt;&lt;br&gt;

This parameterization has been tested on the 10 July 1996 Stratospheric-Tropospheric Experiment: Radiation, Aerosols and Ozone (STERAO) storm.
Comparisons of the simulated flash rate and NO mixing ratio with observations at different locations and stages of the storm show a good agreement.
An individual flash produces on average 121&amp;plusmn;41 moles of NO (7.3&amp;plusmn;2.5&amp;times;10&lt;sup&gt;25&lt;/sup&gt; molecules
NO) for the simulated high cloud base, high shear storm.
Sensitivity tests have been performed to study the impact of the flash rate, the
cloud-to-ground flash ratio, the flash length, the spatial distribution of the NO
molecules, and the production rate per flash on the NO concentration and distribution.
Results show a strong impact from the flash rate, the spatial placement of the
lightning-NO&lt;sub&gt;x&lt;/sub&gt; source and the number of moles produced per flash.</abstract>
	<references>
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</article>

