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Water uptake of subpollen aerosol particles: Hygroscopic growth, cloud condensation nuclei activation, and liquid-liquid phase separation

Mikhailov, Eugene F.; Pöhlker, Mira L.; Reinmuth-Selzle, Kathrin; Vlasenko, Sergey S.; Krüger, Ovid O.; Fröhlich-Nowoisky, Janine; Pöhlker, Christopher; Ivanova, Olga A.; Kiselev, Alexey A. 1,2; Kremper, Leslie A.; Pöschl, Ulrich
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)
2 Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF), Karlsruher Institut für Technologie (KIT)

Pollen grains emitted from vegetation can release subpollen particles (SPPs) that contribute to the fine fraction of atmospheric aerosols and may act as cloud condensation nuclei (CCN), ice nuclei (IN), or aeroallergens. Here, we investigate and characterize the hygroscopic growth and CCN activation of birch, pine, and rapeseed SPPs. A high-humidity tandem differential mobility analyzer (HHTDMA) was used to measure particle restructuring and water uptake over a wide range of relative humidity (RH) from 2 % to 99.5 %, and a continuous flow CCN counter was used for size-resolved measurements of CCN activation at supersaturations (S) in the range of 0.2 % to 1.2 %. For both subsaturated and supersaturated conditions, effective hygroscopicity parameters, κ, were obtained by Köhler model calculations. Gravimetric and chemical analyses, electron microscopy, and dynamic light scattering measurements were performed to characterize further properties of SPPs from aqueous pollen extracts such as chemical composition (starch, proteins, DNA, and inorganic ions) and the hydrodynamic size distribution of water-insoluble material. All investigated SPP samples exhibited a sharp increase of water uptake and κ above ∼95 % RH, suggesting a liquid–liquid phase separation (LLPS). ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000133564
Veröffentlicht am 03.06.2021
DOI: 10.5194/acp-21-6999-2021
Zitationen: 3
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000133564
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 9
Seiten 6999-7022
Nachgewiesen in Web of Science
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