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Ice nucleation ability of ammonium sulfate aerosol particles internally mixed with secondary organics

Bertozzi, Barbara 1; Wagner, Robert 1; Song, Junwei 1; Höhler, Kristina ORCID iD icon 1; Pfeifer, Joschka; Saathoff, Harald ORCID iD icon 1; Leisner, Thomas ORCID iD icon 1; Möhler, Ottmar 1
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The abundance of aerosol particles and their abil-ity to catalyze ice nucleation are key parameters to correctlyunderstand and describe the aerosol indirect effect on the cli-mate. Cirrus clouds strongly influence the Earth’s radiativebudget, but their effect is highly sensitive to their formationmechanism, which is still poorly understood. Sulfate and or-ganics are among the most abundant aerosol components inthe troposphere and have also been found in cirrus ice crys-tal residuals. Most of the studies on ice nucleation at cirruscloud conditions looked at either purely inorganic or purelyorganic particles. However, particles in the atmosphere aremostly found as internal mixtures, the ice nucleation abilityof which is not yet fully characterized.In this study, we investigated the ice nucleation ability ofinternally mixed particles composed of crystalline ammo-nium sulfate (AS) and secondary organic material (SOM)at temperatures between−50 and−65◦C. The SOM wasgenerated from the ozonolysis ofα-pinene. The experimentswere conducted in a large cloud chamber, which also al-lowed us to simulate various aging processes that the par-ticles may experience during their transport in the atmo-sphere, like cloud cycling and redistribution of the organicmatter. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000135922
Veröffentlicht am 28.07.2021
DOI: 10.5194/acp-21-10779-2021
Zitationen: 5
Web of Science
Zitationen: 5
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF)
Institut für Meteorologie und Klimaforschung (IMK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000135922
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 21
Heft 13
Seiten 10779–10798
Projektinformation CLOUD-MOTION (EU, H2020, 764991)
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 16.07.2021
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