Do local urban emissions influence ambient meteorology?

The WRF-Chem model was used to analyze three different 14-day periods during 2016–2017 in Prague, Czech Republic. Specifically a summertime high-level ozone episode, a summertime convective episode and a wintertime episode with high concentrations of aerosol pollutants have been analyzed in great detail. Simulations were run on a 2 km grid domain covering the center of the Czech Republic with the capital Prague, which was nested into a 10 km domain covering Central Europe. For the analysis of the meteorological impact of the reduction of urban induced emissions, two model simulations were performed for each episode; one simulation with full anthropogenic emissions and a second idealized simulation where emissions over the Prague urban area were reduced to the background level. In this presentation we discuss the differences and similarities between these simulations for chemical species (gas and particle pollutants) but also meteorological variables (e.g., downward solar radiation, temperature, boundary layer height).