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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>9</volume_number>
		<issue_number>6</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/acpd-9-24361-2009</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/9/24361/2009/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/9/24361/2009/acpd-9-24361-2009.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/9/24361/2009/acpd-9-24361-2009.pdf</fulltext_pdf>
	<start_page>24361</start_page>
	<end_page>24410</end_page>
	<publication_date>2009-11-16</publication_date>
	<article_title content_type="html">Modelling the reversible uptake of chemical species in the gas phase by ice particles formed in a convective cloud</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>V. Marécal</name>
			<email>virginie.marecal@cnrs-orleans.fr</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>M. Pirre</name>
		</author>
		<author numeration="3" affiliations="2">
			<name>E. D. Rivière</name>
		</author>
		<author numeration="4" affiliations="3">
			<name>N. Pouvesle</name>
		</author>
		<author numeration="5" affiliations="3">
			<name>J. N. Crowley</name>
		</author>
		<author numeration="6" affiliations="4">
			<name>S. R. Freitas</name>
		</author>
		<author numeration="7" affiliations="4">
			<name>K. M. Longo</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Laboratoire de Physique et Chimie de l&apos;Environnement et de l&apos;Espace, CNRS-Université d&apos;Orléans, Orléans, France</affiliation>
		<affiliation numeration="2" content_type="html">Groupe de Spectrométrie Moléculaire et Atmosphérique, Université de Reims-CNRS, Reims, France</affiliation>
		<affiliation numeration="3" content_type="html">Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Mainz, Germany</affiliation>
		<affiliation numeration="4" content_type="html">Center for Weather Forecasts and Climate Studies, INPE, Cachoeira Paulista, Brazil</affiliation>
	</affiliations>
	<abstract content_type="html">The present paper is a preliminary study preparing the introduction of
reversible trace gas uptake by ice particles into a 3-D cloud resolving
model. For this a 3-D simulation of a tropical deep convection cloud was run
with the BRAMS cloud resolving model using a two-moment bulk microphysical
parameterization. Trajectories encountering the convective clouds were
computed from these simulation outputs along which the variations of the
pristine ice, snow and aggregate mixing ratios and size distributions were
extracted. The reversible uptake of 11 trace gases by ice was examined
assuming applicability of Langmuir isotherms using recently evaluated
(IUPAC) laboratory data. The results show that ice uptake is only
significant for HNO&lt;sub&gt;3&lt;/sub&gt;, HCl, CH&lt;sub&gt;3&lt;/sub&gt;COOH and HCOOH. For H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;,
using new results for the partition coefficient results in significant
partitioning to the ice phase for this trace gas also. It was also shown
that the uptake is largely dependent on the temperature for some species.
The adsorption saturation at the ice surface for large gas concentrations is
generally not a limiting factor except for HNO&lt;sub&gt;3&lt;/sub&gt; and HCl for gas
concentration greater than 1 ppbv. For HNO&lt;sub&gt;3&lt;/sub&gt;, results were also obtained
using a trapping theory, resulting in a similar order of magnitude of
uptake, although the two approaches are based on different assumptions. The
results were compared to those obtained using a BRAMS cloud simulation based
on a single-moment microphysical scheme instead of the two moment scheme. We
found similar results with a slightly more important uptake when using the
single-moment scheme which is related to slightly higher ice mixing ratios
in this simulation. The way to introduce these results in the 3-D cloud model
is discussed.</abstract>
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</article>

