Heidelberg 2015 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Atmosphäre

UP 2.19: Vortrag

Mittwoch, 25. März 2015, 15:45–16:00, G/gHS

In situ characterization of small cloud ice particles in mixed phase clouds — •Paul Vochezer, Martin Schnaiter, and Thomas Leisner — IMK, Karlsruhe Institute of Technology, Karlsruhe, Germany

Mixed phase clouds contain liquid droplets as well as ice particles and are a common cloud type in mid-latitudes. The occurrence of ice particles in mixed phase clouds is of importance for their dynamics, lifetime and radiative properties. In order to characterize mixed phase clouds we use the small ice detector (SID) cloud probe in which a light scattering experiment with individual cloud particles is carried out. A careful analysis of the light scattered in 5° - 26° relative to the forward direction allows for a detailed characterization of liquid water droplets and ice particles. In case of a liquid droplet a Mie solution is fitted to the measured profile which allows for a precise size determination and calibration of the instrument. In case of an ice particle a shape factor and a roughness parameter are determined for each individual particle. We present results of measurements on artificial and natural mixed phase clouds. Artificial clouds were generated under well-defined laboratory conditions at the AIDA cloud chamber facility of the Karlsruhe Institute of Technology. The measurements on natural mixed phase clouds were conducted at the High Alpine Research Station Jungfraujoch as well as on board of research aircrafts in the Canadian arctic over the Beaufort Sea.