(1) Atmospheric characteristics in the environment of observed convective cells based on high-resolution model analysis data (2) Einfluss von Aerosolgehalt und atmosphärischen Parametern auf Wolkenbildung und Konvektion (3) The HyMeX IOP16 heavy precipitation event. A sensitivity study using GPS nudging and dynamical downscaling (4) Simulation of secondary particle formation as a result of major volcanic eruptions