The 39th AK Klima Annual Meeting was held from 5 to 7 November 2021 in Passau, Germany. In the context of this Meeting, the effects of the city of Berlin on the regional atmospheric boundary layer as they are investigated in the context of the urbisphere Berlin campaign (“Die ‚urbisphere‘ Berlin-Kampagne - Auswirkungen der Stadt Berlin auf die regionale atmosphärische Grenzschicht” in German) were presented by Prof. Dieter Scherer (Technische Universität Berlin).