Clouds are still one of the largest uncertainties in climate modelling. Aerosol particles interact with clouds in several ways: Water condenses on pre-existing aerosol particles (cloud condensation nuclei) to form clouds, but cloud processing also alters the composition and mixing state of the aerosol particles that remain in the air after the cloud droplets have evaporated. Ice formation in clouds depends strongly on the availability of ice nuclei. This talk will present measurements of the chemical composition of cloud residual particles from liquid droplets and from ice crystals. The sampling locations include the Caribbean (Puerto Rico), Central Germany (Schmücke) and high altitude Alpine sites (Zugspitze and Jungfraujoch). Two types of aerosol mass spectrometers were used: Single particle laser ablation MS and thermal desorption, electron impact ionization MS (Aerodyne AMS). The results show the high variability of ice residuals particle composition, reflecting air mass origin and cloud formation conditions. In liquid cloud droplets a change of mixing state caused by cloud processing as well as the uptake of nitric acid in cloud droplets were detected.

This event is part of the eventgroup Meteorology Colloquium Karlsruhe

Speaker
Dr. Johannes Schneider

Max Plank Institut für Chemie in Mainz
Abt. Partikelchemie

Organizer
Institut für Meteorologie und Klimaforschung
Karlsruher Institut für Technologie (KIT)
Hermann von Helmholtz Platz 1
76344 Eggenstein-Leopoldshafen
Tel: 0721-608-0
Mail: sekretariat ∂does-not-exist.imk-asf kit edu

Targetgroup
Scientific Staff