Heidelberg 2015 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 4: Postersession Atmosphäre

UP 4.19: Poster

Mittwoch, 25. März 2015, 10:45–19:45, G/Foyer

Different dusts in AIDA cloud chamber immersion freezing and deposition ice nucleation experiments — •Romy Ullrich, Naruki Hiranuma, Corinna Hoose, Ottmar Möhler, Monika Niemand, Isabelle Steinke, and Robert Wagner — Karlsruher Institut für Technologie, Karlsruhe, Deutschland

Aerosols are defined as liquid or solid suspended particles in air. Their diverse composition and different sources impede a uniform handling regarding their ice nucleating ability and efficiency. Model studies, in-situ measurements as well as laboratory studies point out the importance of natural dust for heterogeneous ice nucleation. The variety of dust species shows the importance of the source and chemical features for forming ice by heterogeneous nucleation. The AIDA (Aerosol Interactions and Dynamics in the Atmosphere) cloud chamber was used for a series of ice nucleation experiments with among others different natural dust species to investigate the different ice nucleating behavior. These studies result in a comprehensive overview of the ice nucleation efficiency as a function of aerosol, temperature and humidity.

This conference contribution will show recent findings from the AIDA cloud chamber for different dust species including desert dust, soil dust, different clay minerals and volcanic ash particles (Steinke et al. (2011)). Additionally, a comparison of the different dust species regarding ice activity and possible reasons for deviations will be presented.

Steinke, I. (2011) Atmos. Chem. Phys., 11, 12945-12958