Geoscientific Model Development Discussions www.geosci-model-dev-discuss.net 1991-9611 1991-962X 2 1 2009 10.5194/gmdd-2-247-2009 http://www.geosci-model-dev-discuss.net/2/247/2009/ http://www.geosci-model-dev-discuss.net/2/247/2009/gmdd-2-247-2009.html http://www.geosci-model-dev-discuss.net/2/247/2009/gmdd-2-247-2009.pdf 247 278 2009-03-11 Evaluation of the parametrized transport of lead-210 in high-altitude European sites I. Dombrowski-Etchevers ingrid.etchevers@meteo.fr V.-H. Peuch B. Josse M. Legrand CNRM/GAME, Météo-France/CNRS, Toulouse and Grenoble, France Laboratoire de Glaciologie et de Geophysique de l'Environnement, CNRS, Saint-Martin d'Heres, France One important aspect in current climate modelling is to correctly simulate the regional variability of aerosols forcings. A first step to address this issue is to evaluate the tropospheric vertical distribution of submicronic aerosol (including sulfate and organic aerosol) in particular in the free troposphere. <br><br> ²¹⁰Pb is particularly interesting to study the dynamic transport by chemistry and transport models, because it is an excellent passive tracer of atmospheric circulation. Hence, it is a simple representative of atmospheric submicronic aerosol and its transport is well correlated with sulfate aerosol. Indeed, ²¹⁰Pb and ²²²Rn (its radioactive parent) have been widely used for model verification. We present here pluriannual simulations of ²¹⁰Pb made with the multiscale global to regional model MOCAGE of Météo-France, which allows to investigate resolution effects over Europe and specially anomalies in link with the heat wave episode of summer 2003 and associated increased convection. <br><br> Precisely, simulations over Europe over 3 years, 2002 to 2004, are compared with the original dataset gathered in particular over high-altitude sites during the CARBOSOL project. We particularly focus our attention on the vertical unresolved-scale transport parameterisation and analyse the strong seasonality in ²¹⁰Pb concentrations (maximum in summer, minimum in winter), which was exceptionnally marked in 2003. Balkanski, Y. J., Jacob, D. J., Gardner, G. M., Graustein, W. C., and Turekian, K. K.: Transport and residence times of tropospheric aerosols as inferred from a global three-dimensional simulation of $^210$Pb, J. Geophys. Res., 98, (D11), 20573–20586, 1993. 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