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Simulating the influence of primary biological aerosol particles on clouds by heterogeneous ice nucleation

Hummel, Matthias; Hoose, Corinna; Pummer, Bernhard; Schaupp, Caroline; Fröhlich-Nowoisky, Janine; Möhler, Ottmar

Abstract:
Primary ice formation, which is an important process for mixed-phase clouds with an impact on their lifetime, radiative balance, and hence the climate, strongly depends on the availability of ice-nucleating particles (INPs). Supercooled droplets within these clouds remain liquid until an INP immersed in or colliding with the droplet reaches its activation temperature. Only a few aerosol particles are acting as INPs and the freezing efficiency varies among them. Thus, the fraction of supercooled water in the cloud depends on the specific properties and concentrations of the INPs. Primary biological aerosol particles (PBAPs) have been identified as very efficient INPs at high subzero temperatures, but their very low atmospheric concentrations make it difficult to quantify their impact on clouds.

Here we use the regional atmospheric model COSMO–ART to simulate the heterogeneous ice nucleation by PBAPs during a 1-week case study on a domain covering Europe. We focus on three highly ice-nucleation-active PBAP species, Pseudomonas syringae bacteria cells and spores from the fungi Cladosporium sp. and Mortierella alpina. PBAP emissions ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000087295
Veröffentlicht am 07.11.2018
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1680-7324
urn:nbn:de:swb:90-872957
KITopen-ID: 1000087295
HGF-Programm 12.01.01 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 18
Heft 20
Seiten 15437–15450
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 26.10.2018
Nachgewiesen in Web of Science
Scopus
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