Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-9597-2009 http://www.atmos-chem-phys-discuss.net/9/9597/2009/ http://www.atmos-chem-phys-discuss.net/9/9597/2009/acpd-9-9597-2009.html http://www.atmos-chem-phys-discuss.net/9/9597/2009/acpd-9-9597-2009.pdf 9597 9645 2009-04-16 Parameterization of vertical diffusion and the atmospheric boundary layer height determination in the EMEP model A. Jeričević jericevic@cirus.dhz.hr L. Kraljević B. Grisogono H. Fagerli Meteorological and Hydrological Service of Croatia, Zagreb, Croatia Andrija Mohorovičić Geophysical Institute, Department of Geophysics, Faculty of Science, University of Zagreb, Croatia Norwegian Meteorological Institute, Oslo, Norway A new vertical diffusion scheme, called Grisogono, has been implemented in the Unified EMEP (European Monitoring and Evaluation Programme) model. It is shown based on Large Eddy Simulation (LES) that the Grisogono method performs better than the operational O'Brien's polynomial, especially in the stable conditions. In this work, the operational and proposed new parameterization for eddy diffusivity <i>K(z)</i> have been validated against observed daily surface nitrogen dioxide (NO<sub>2</sub>), sulphur dioxide (SO<sub>2</sub>) and sulphate (SO<sub>4</sub><sup>&minus;2</sup>) concentrations at different EMEP stations during year 2001. Moderate improvement in the correlation coefficient and bias for NO<sub>2</sub> and SO<sub>2</sub> and slight improvement for sulphate is found for most of the analyzed stations with the Grisogono <i>K(z)</i> scheme, which is recommended for further application due to its scientific and technical advantages. Special emphasis is given to the representation of the atmospheric boundary layer (ABL) in order to capture vertical transport and dispersion of atmospheric air pollution. 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