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**The Chemical Lagrangian Model of the Stratosphere (CLaMS)**
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**CLaMS** (**C**hemical **La**grangian **M**odel of the **S**tratosphere) is a modular chemistry transport model (CTM) system developed at Research Centre Jülich, Germany. CLaMS was first described by !McKenna et al (2000a,b) and was expanded into three dimensions by Konopka et al (2004). CLaMS has been employed in various European aircraft field campaigns over two decades including THESEO, EUPLEX, TROCCINOX, SCOUT-O3, RECONCILE and STRATOCLIM with a focus on simulating ozone depletion and water vapour transport.
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Major strengths of CLaMS in comparison to other CTMs are
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* its low diffusive Lagrangian transport scheme with the ability to reproduce small-scale structures and gradients of trace species
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* its applicability for reverse domain filling studies
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* its anisotropic mixing scheme
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* its integrability with arbitrary observational data
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* its comprehensive chemistry scheme
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**CLaMS Documentation**
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The details of the model CLaMS are well documented and published in the scientific literature.
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* Formulation of advection and mixing by [McKenna et al. (2002a)](http://hdl.handle.net/doi:10.1029/2000JD000114).
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* Formulation of chemistry-scheme and initialisation by [McKenna et al. (2002b)](http://hdl.handle.net/doi:10.1029/2000JD000113).
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* Comparison of the chemistry module with other stratospheric models by [Krämer et al. (2003)](http://hdl.handle.net/doi:10.1023/A:1024056026432).
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* Calculation of photolysis rates by [Becker et al. (2000)](http://hdl.handle.net/doi:10.1023/A:1006468926530).
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* Extension to 3-dimension model version by [Konopka et al. (2004)](http://hdl.handle.net/doi:10.1029/2003JD003792).
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* Lagrangian sedimentation by [Grooß et al. (2005)](http://direct.sref.org/1680-7324/acp/2005-5-1437).
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* Improved sedimentation of NAT by [Grooß et al. (2014)](http://www.atmos-chem-phys.net/14/1055/2014/acp-14-1055-2014.html) and of ice by [Tritscher et al. (2019)](https://www.atmos-chem-phys.net/19/543/2019/).
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* Extension to the (upper) troposphere using hybrid vertical coordinate zeta by [Konopka et al. (2007)](http://www.atmos-chem-phys.net/7/3285/2007/acp-7-3285-2007.html).
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* Incorporation of the concept of air mass origin tracers by [Günther et al. (2008)](http://www.atmos-chem-phys.net/8/3655/2008/acp-8-3655-2008.html).
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* Climatological simulation and simplified chemistry by [Pommrich et al. (2014)](http://www.geosci-model-dev.net/7/2895/2014/gmd-7-2895-2014.html).
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* Integration of Lagrangian transport into the climate model EMAC by [Hoppe et al. (2014)](http://www.geosci-model-dev.net/7/2639/2014/gmd-7-2639-2014.html).
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* Tropospheric mixing and parametrization of unresolved convective updrafts by [Konopka et al. (2019)](https://www.geosci-model-dev.net/12/2441/2019/). |