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<article language="en">
	<journal>
		<journal_title>Geoscientific Model Development Discussions</journal_title>
		<journal_url>www.geosci-model-dev-discuss.net</journal_url>
		<issn>1991-9611</issn>
		<eissn>1991-962X</eissn>
		<volume_number>3</volume_number>
		<issue_number>2</issue_number>
		<publication_year>2010</publication_year>
	</journal>
	<doi>10.5194/gmdd-3-769-2010</doi>
	<article_url>http://www.geosci-model-dev-discuss.net/3/769/2010/</article_url>
	<abstract_html>http://www.geosci-model-dev-discuss.net/3/769/2010/gmdd-3-769-2010.html</abstract_html>
	<fulltext_pdf>http://www.geosci-model-dev-discuss.net/3/769/2010/gmdd-3-769-2010.pdf</fulltext_pdf>
	<start_page>769</start_page>
	<end_page>817</end_page>
	<publication_date>2010-06-01</publication_date>
	<article_title content_type="html">The Lagrangian chemistry and transport model ATLAS: simulation and validation of stratospheric chemistry and ozone loss in the winter 1999/2000</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>I. Wohltmann</name>
			<email>ingo.wohltmann@awi.de</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>R. Lehmann</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>M. Rex</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany</affiliation>
	</affiliations>
	<abstract content_type="html">ATLAS is a new global Lagrangian Chemistry and Transport Model
      (CTM), which includes a stratospheric chemistry scheme with 46
      active species, 171 reactions, heterogeneous chemistry on
      polar stratospheric clouds and a Lagrangian denitrification
      module.  Lagrangian (trajectory-based) models have several
      important advantages over conventional Eulerian models,
      including the absence of spurious numerical diffusion,
      efficient code parallelization and no limitation of the
      largest time step by the Courant-Friedrichs-Lewy
      criterion. This work describes and validates the stratospheric
      chemistry scheme of the model.  Stratospheric chemistry is
      simulated with ATLAS for the Arctic winter 1999/2000, with
      a focus on polar ozone depletion and denitrification. The
      simulations are used to validate the chemistry module in
      comparison with measurements of the SOLVE/THESEO 2000
      campaign.  A Lagrangian denitrification module, which is based
      on the simulation of the nucleation, sedimentation and growth
      of a large number of polar stratospheric cloud particles, is
      used to model the substantial denitrification that occured in
      this winter.</abstract>
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