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Studies of propane flame soot acting as heterogeneous ice nuclei in conjunction with single particle soot photometer measurements

Crawford, I.; Möhler, O. 1; Schnaiter, M. ORCID iD icon 1; Saathoff, H. ORCID iD icon 1; Liu, D.; McMeeking, G.; Linke, C. 1; Flynn, M.; Bower, K. N.; Connolly, P. J.; Gallagher, M. W.; Coe, H.
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)


The ice nucleation efficiency of propane flame soot particles with and without a sulphuric acid coating was investigated using the aerosol and cloud chamber facility AIDA (Aerosol Interaction and Dynamics in the Atmosphere). The test soot for cloud formation simulations was produced using a propane flame Combustion Aerosol Standard generator (CAST, Jing-CAST Technologies). The organic carbon content (OC) of the test soot was altered in a reproducible fashion by changing the fuel/air mixture of the generator. The soot content of ice nuclei was subsequently investigated using a combination of a pumped counterflow virtual impactor (PCVI) to separate and evaporate the ice crystals, and a DMT single particle soot photometer (SP2) to examine the mixing state of the BC containing ice residuals. Ice nucleation was found to be most efficient for uncoated soot of low organic carbon content (~5% organic carbon content) where deposition freezing occurred at an ice saturation ratio Sice ~1.22 at a temperature T =226.6K with 25% of the test soot becoming active as ice nuclei. Propane flame soot of higher organic carbon content (~30% and ~70% organic carbon content) showed significantly lower ice nucleation efficiency (an activated fraction of the order of a few percent in the experiments) than the low organic carbon content soot, with water saturation being required for freezing to occur. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000038677
Veröffentlicht am 27.04.2018
DOI: 10.5194/acp-11-9549-2011
Zitationen: 51
Web of Science
Zitationen: 50
Zitationen: 63
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2011
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000038677
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 11
Heft 18
Seiten 9549-9561
Nachgewiesen in Scopus
Web of Science
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