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Modelling heterogeneous ice nucleation on mineral dust and soot with parameterizations based on laboratory experiments

Hoose, C. ORCID iD icon; Hande, L. B.; Möhler, O.; Niemand, M.; Paukert, M.; Reichardt, I.; Ullrich, R. ORCID iD icon

Abstract (englisch):

Between 0 and -37°C, ice formation in clouds is triggered by aerosol particles acting as heterogeneous ice nuclei. At lower temperatures, heterogeneous ice nucleation on aerosols can occur at lower supersaturations than homogeneous freezing of solutes. In laboratory experiments, the ability of different aerosol species (e.g. desert dusts, soot, biological particles) has been studied in detail and quantified via various theoretical or empirical parameterization approaches. For experiments in the AIDA cloud chamber, we have quantified the ice nucleation efficiency via a temperature- and supersaturation dependent ice nucleation active site density. Here we present a new empirical parameterization scheme for immersion and deposition ice nucleation on desert dust and soot based on these experimental data. The application of this parameterization to the simulation of cirrus clouds, deep convective clouds and orographic clouds will be shown, including the extension of the scheme to the treatment of freezing of rain drops. The results are compared to other heterogeneous ice nucleation schemes. Furthermore, an aerosol-dependent parameterization of contact ice nucleation is presented.

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF)
Institut für Meteorologie und Klimaforschung – Forschungsbereich Troposphäre (IMK-TRO)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Vortrag
Publikationsjahr 2016
Sprache Englisch
Identifikator KITopen-ID: 1000065064
HGF-Programm 12.01.01 (POF III, LK 01) Clouds in a pertubed atmosphere
Veranstaltung AGU Fall Meeting, San Francicso, USA, 12.-16. December 2016
Bemerkung zur Veröffentlichung A52C-01
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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