2018, Knudsen, Erlend M., Heinold, Bernd, Dahlke, Sandro, Bozem, Heiko, Crewell, Susanne, Gorodetskaya, Irina V., Heygster, Georg, Kunkel, Daniel, Maturilli, Marion, Mech, Mario, Viceto, Carolina, Rinke, Annette, Schmithüsen, Holger, Ehrlich, André, Macke, Andreas, Lüpkes, Christof, Wendisch, Manfred

The two concerted field campaigns, Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) and the Physical feedbacks of Arctic planetary boundary level Sea ice, Cloud and AerosoL (PASCAL), took place near Svalbard from 23 May to 26 June 2017. They were focused on studying Arctic mixed-phase clouds and involved observations from two airplanes (ACLOUD), an icebreaker (PASCAL) and a tethered balloon, as well as ground-based stations. Here, we present the synoptic development during the