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Discussion papers | Copyright
https://doi.org/10.5194/gmdd-4-1185-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Development and technical paper 14 Jun 2011

Development and technical paper | 14 Jun 2011

Review status
This discussion paper is a preprint. It has been under review for the journal Geoscientific Model Development (GMD). The revised manuscript was not accepted.

Carbon monoxide as a tracer for tropical troposphere to stratosphere transport in the Chemical Lagrangian Model of the Stratosphere (CLaMS)

R. Pommrich1,4,5, R. Müller1, J.-U. Grooß1, P. Konopka1, G. Günther1, H.-C. Pumphrey2, S. Viciani3, F. D'Amato3, and M. Riese1 R. Pommrich et al.
  • 1IEK-7, Forschungszentrum Jülich, Jülich, Germany
  • 2School of GeoSciences, University of Edinburgh, Edinburgh, UK
  • 3CNR-Istituto Nazionale di Ottica (CNR-INO), L. go E. Fermi 6, 50125 Firenze, Italy
  • 4Laboratoire d'Aérologie, UMR5560, CNRS/INSU-Université de Toulouse 3, 14 Av Edouard Belin, 31400 Toulouse, France
  • 5Groupe d'étude de l'Atmosphère Météorologique, URA 1357, CNRM-GAME, Météo-France, 42 Av Gaspard Coriolis, 31057 Toulouse Cedex 1, France

Abstract. Variations in the mixing ratio of trace gases of tropospheric origin entering the stratosphere in the tropics are of interest for assessing both troposphere to stratosphere transport fluxes in the tropics and the impact on the composition of the tropical lower stratosphere of quasi-horizontal in-mixing into the tropical tropopause layer from the mid-latitude stratosphere. Here, we present a simplified chemistry scheme for the Chemical Lagrangian Model of the Stratosphere (CLaMS) for the simulation, at comparatively low numerical cost, of CO, ozone, and long-lived trace substances (CH4, N2O, CCl3F, and CO2) in the lower tropical stratosphere. The boundary conditions at the ground are represented for the long-lived trace substances CH4, N2O, CCl3F, and CO2 based on ground-based measurements. The boundary condition for CO in the free troposphere is deduced from MOPITT measurements. We find that the zonally averaged tropical CO anomaly patterns simulated by this model version of CLaMS are in good agreement with observations. The introduction of a new scheme in the ECMWF integrated forecast system (Tompkins et al., 2007) for the ice supersaturation after September 2006, results in a somewhat less good agreement between observed and simulated CO patterns in the tropical lower stratosphere after this date.

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