Unpredictable weather, extreme rainfall or snow increasingly leads to challenges for people and nature. Paradoxically, less air pollution and cleaner clouds could lead to more extreme events. To understand how clouds will respond to changes in pollution, and in a post-fossil world is key for the world’s ability to plan for the future. This is at the heart of the EU-funded research project CleanCloud (Clouds and climate transitioning to post-fossil aerosol regime), comprised of 20 European research institutes with expertise in land- and space-based remote sensing, laboratory and in-situ atmospheric aerosol and cloud chamber experiments, and kilometer and large-scale aerosol, cloud, and climate modelling. CleanCloud, aims to quantify and understand regional and temporal effects of ACI-related processes, and how they will evolve in the transition to the post-fossil regime.

The Arctic is warming up to 4 times the global average, leading to rapid ice melting and a drastic change of the sources of aerosols and their impact on clouds. Natural aerosols are also a major driver of these changes. Monitoring of these changes is extremely sparse, especially in the most remote regions where harsh conditions make it difficult to carry out even simple measurements over time. Because of this, models of climate change for this remote region are virtually unconstrained by observations, making predictions highly uncertain. CleanCloud addresses important knowledge gaps, both by providing observations of Arctic aerosols and their interactions with clouds, and by testing algorithms used for remote sensing of aerosols and clouds by satellites and developing new ones.

Here we present a short video documentary with scenes and pictures from the 2024 CLeancloud Arctic VIllum ExpeRiment (CLAVIER) - Spring Phase campaign at Villum, Greenland, showcasing the challenges, extreme conditions that the CleanCloud team had to overcome, but also the beauty and rapidly changing conditions in the Arctic. Villum research station is located in one of the most remote and extreme environments on Earth, which makes it an exceptional site for studying the Arctic climate, atmosphere, and ecosystem.

Media credits: 

• Video: Lionel Favre (EPFL)
• Pictures: Lionel Favre (EPFL), Romanos Foskinis (EPFL), Radiance Calmer (EPFL), Holder Siebert (TROPOS), Michael Schäfer (U.Leipzig), Henrik Skov (Aarhus U),
• Music: Athanasios Nenes (FORTH/EPFL: piano), Alex Dunn (clarinet)
  M.Newmann Terpsichore (main theme); D.Giammar (cello), M.Han (violin)
  J.Brahms (Trio for Clarinet, Cello & Piano, op.114 in A minor. III. Andantino grazioso – Trio; IV: Allegro); Todd Murphy (cello)

Acknowledgments: