The RACLETS (Role of Aerosols and CLouds Enhanced by Topography on Snow) campaign uniquely combines cloud and snow research to improve the understanding of precipitation formation in clouds and snow deposition on the ground.

During the RACLETS field campaign in February/March 2019, an extensive set of instruments were deployed in the Davos regions including aerosol, cloud, precipitation and snow measurements. In a unique cooperation between cloud and snow research, the goal was to observe the complete life cycle of ice crystals:

• Cloud droplet formation and ice nucleation on aerosol particles
• Growth of cloud droplets and ice crystals to precipitation particles
• Ice crystal enhancement by ice multiplication
• Precipitation location and amount on the ground
• Redistribution of snow on the ground

The measurements will be contextualized by using regional numerical weather models for the atmosphere and high-resolution models for snow deposition.