Study of the influence of various vertical turbulent diffusion profiles on the concentrations of secondary inorganic aerosol and their gas precursors over Central Europe

<p><span>U</span><span>ncertainties associated with the determination of </span><span>model </span><span>vertical turbulent diffusion profiles are generally considered to be one of the main causes of the </span><span>discrepancies</span><span> between modeled and measured pollutant concentrations. </span> In this work, we performed four two-year long offline simulations, specifically for the period 2018&#8211;2019, using the WRF-CAMx model system over Central Europe with a horizontal resolution of 9 km x 9 km in which we used various methods of calculation of vertical turbulent diffusion coefficients (based on WRF meteorology) while the other meteorological fields we kept the same. <span>F</span><span>urther, </span><span>w</span><span>e analyzed the effects of these perturbations on spatio-temporal changes in concentration</span><span>s</span><span> of some components of the fine fraction of inorganic aerosols (ammonium, sul</span><span>f</span><span>ates and nitrates) and their gaseous precursors (ammonia, NO</span>_{<span>x</span>}<span>, sulfur dioxide). </span><span>We also validated the surface concentrations of the mentioned pollutants using </span><span>the </span><span>AirBase and EMEP data</span><span>set</span><span>s</span><span>.</span></p>