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Lab experiments on the complex microphysics controlling PMC formation

Duft, Denis; Nachbar, Mario; Dresch, Thomas; Wilms, Henrike; Rapp, Markus; Leisner, Thomas ORCID iD icon

Abstract (englisch):

Until recently it was believed that surface properties which determine the contact parameter of ice on the ice nuclei surface are the major uncertainty in the description of mesospheric ice particle formation processes. However, the combination of laboratory experiments and numerical simulation studies on Polar Mesospheric Cloud (PMC) formation showed that other parameters such as the absorption coefficient for solar and infrared radiation, atmospheric dynamics and the kinetics of ice particle growth may play a comparably important role in the PMC formation process. Key properties influencing cloud formation such as desorption energy, contact parameter and light absorption coefficient of the materials that are presumed as Meteoric Smoke Particle (MSP) constituents as well as type and saturation vapor pressure of the possible ice phases of PMC particles are insufficiently known at mesospheric conditions. To tackle these issues we performed laboratory experiments using the mesospheric ice cloud chamber MICE-TRAPS on artificially produced MSP analogues of variable iron silicate composition. We present measurements of the desorption energy and contact parameter of the investigated materials. ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Vortrag
Publikationsdatum 18.09.2017
Sprache Englisch
Identifikator KITopen-ID: 1000076443
HGF-Programm 12.04.02 (POF III, LK 01) Cirrus Clouds
Veranstaltung 13th International Workshop on Layered Phenomena in the Mesopause Region (LPMR) , Kühlungsborng, 18. - 22. September 2017
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