Abstract
The chapter discusses the physico-chemical behavior of aerosols and Cloud Condensation Nuclei (CCN) during cloud formation at Jungfraujoch, Switzerland. High-elevation mountain sites are particularly suited to study cloud droplet along with the ice nucleation process in mixed phase clouds, as they are in the cloud during most of the precipitation events. Therefore, the high-alpine research station Jungfraujoch, Switzerland was chosen to conduct in-cloud scavenging experiments, aiming at the investigation of interactions between aerosol particles, cloud droplets, and ice crystals. In-cloud scavenging experiments were conducted at a high-altitude site to investigate the aerosol–cloud relationship. Cloud events were characterized by a nearly complete activation of accumulation mode aerosol particles in the period of cloud formation. This was reflected in the fraction of activated sulfate, which was often close to 1. The median cloud liquid water content was 0.085 g m-3 with no significant seasonality. In combination with a strong seasonality of the aerosol concentration with much higher values in summer, it can be assumed that cloud droplet sizes are smaller in the warmer season.
Published Version
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