Side Event at 25th UN Climate Change Conferenz in Madrid, 2 to 13 December 2019


"German Science Hour", Prof. Dr. Andreas Macke and Cristofer Jimenez (TROPOS)


Title: "Aerosol-cliud interaction in a changing climate: chance or threat"

Climate change is complex and by far not just about greenhouse gases! We need to raise awareness about the relevance of human-made and natural airborne particles, called aerosols, for global warming - especially given their role in cloud and precipitation processes, a weak spot in current climate models. In the context of the implementation of the Paris Agreement, the global aerosol mix will change. We need to start documenting this change and its effects to put climate projections on a more solid basis. The international observation network ACTRIS was established for this purpose.

At the side event the underlying physical processes are explained. Experts at measuring stations of key locations on different continents and at the research vessel "Polarstern" in the Arctic will be connected via live streams to discuss the influence of changing air pollution on local weather and global climate change.



Welcome to the German Pavilion
Open and communicative – that is how the German pavilion is presenting itself at the 25th United Nations Climate Change Conference (COP 25) in Madrid, Spain. Germany's information stand has been jointly organized by the Federal Environment Ministry and the Federal Ministry for Economic Cooperation and Development.

Event programme:

Side event "Aerosol-cloud interaction in a changing climate: chance or threat?"


  • Measurements of the Atmosphere in Punta Arenas, Chile (DACAPO-PESO), Foto: Martin Radenz / TROPOS

  • Installation of a PollyXT-lidar device in Dushanbe, Tajiikistan, Foto: Dietrich Althausen / TROPOS

  • Measurements of the Atmosphere in Limassol, Cyprus (CyCARE), Foto: TROPOS

  • One year drift of the research icebreaker "Polarstern" in the Arctic (MOSAiC), Foto: Ronny Engelmann / TROPOS