Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-5889-2009 http://www.atmos-chem-phys-discuss.net/9/5889/2009/ http://www.atmos-chem-phys-discuss.net/9/5889/2009/acpd-9-5889-2009.html http://www.atmos-chem-phys-discuss.net/9/5889/2009/acpd-9-5889-2009.pdf 5889 5928 2009-03-04 Regional modelling of tracer transport by tropical convection – Part 1: Sensitivity to convection parameterization J. Arteta Joaquim.Arteta@cnrs-orleans.fr V. Marécal E. D. Rivière Laboratoire de Physique et Chimie de l'Environnement, CNRS and Université d'Orléans, 3A avenue de la recherche scientifique, 45071 Orléans cedex 2, France Groupe de Spectroscopie Moléculaire et Atmosphérique, Université de Reims, Moulin de la Housse, B.P. 1039, 51687 Reims Cedex, France The general objective of this series of papers is to evaluate long duration limited area simulations with idealised tracers as a tool to assess tracer transport in chemistry-transport models (CTMs). In this first paper, we analyse the results of six simulations using different convection parameterizations. The simulations are using the Grell and Dévényi (2002) mass-flux framework for the convection parameterization with different closures (Grell=GR, Arakawa-Shubert=AS, Kain-Fritch=KF, Low omega=LO, Moisture convergence=MC) and an ensemble parameterization (EN) based on the other five closures. The simulations are run for one month during the SCOUT-O3 field campaign lead from Darwin (Australia) and have a 60 km horizontal resolution and a fine vertical resolution in the upper troposphere/lower stratosphere. Meteorological results are compared with satellite products, radiosoundings and SCOUT-O3 aircraft campaign data. They show that the model is generally in good agreement with the measurements with less variability in the model. Except for the precipitation field the differences between the six simulations are small with respect to the differences with the meteorological observations. The comparison with TRMM rainrates shows that the six simulations have two different behaviours with the EN, AS and KF parameterizations (Group 1) providing better rain fields than LO, MC and GR (Group 2). 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