气候变化领域集成服务门户(CCPortal): Water uptake of subpollen aerosol particles: Hygroscopic growth, cloud condensation nuclei activation, and liquid-liquid phase separation

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DOI	10.5194/acp-21-6999-2021
	Water uptake of subpollen aerosol particles: Hygroscopic growth, cloud condensation nuclei activation, and liquid-liquid phase separation
	Mikhailov E.F.; Pöhlker M.L.; Reinmuth-Selzle K.; Vlasenko S.S.; Krüger O.O.; Fröhlich-Nowoisky J.; Pöhlker C.; Ivanova O.A.; Kiselev A.A.; Kremper L.A.; Pöschl U.
发表日期	2021
ISSN	1680-7316
起始页码	6999
结束页码	7022
卷号	21 期号:9
英文摘要	Pollen grains emitted from vegetation can release subpollen particles (SPPs) that contribute to the fine frac tion of atmospheric aerosols and may act as cloud con densation 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 (HHT DMA) was used to measure particle restructuring and wa ter 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 activa tion 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 Köh ler model calculations. Gravimetric and chemical analyses, electron microscopy, and dynamic light scattering measure ments were performed to characterize further properties of SPPs from aqueous pollen extracts such as chemical com position (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). The HHTDMA measure ments at RH > 95 % enable closure between the CCN activation at water vapor supersaturation and hygroscopic growth at subsaturated conditions, which is often not achieved when hygroscopicity tandem differential mobility analyzer (HT DMA) measurements are performed at lower RH where the water uptake and effective hygroscopicity may be limited by the effects of LLPS. Such effects may be important not only for closure between hygroscopic growth and CCN activation but also for the chemical reactivity, allergenic potential, and related health effects of SPPs. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; cloud condensation nucleus; hygroscopicity; separation; size distribution; water uptake; water vapor; Brassica napus
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246908
作者单位	Multiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, Mainz, 55020, Germany; Department of Atmospheric Physics, Saint Petersburg State University, 7/9 Universitetskaya nab., St Petersburg, 199034, Russian Federation; Atmospheric Aerosol Research Department, Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
推荐引用方式 GB/T 7714	Mikhailov E.F.,Pöhlker M.L.,Reinmuth-Selzle K.,et al. Water uptake of subpollen aerosol particles: Hygroscopic growth, cloud condensation nuclei activation, and liquid-liquid phase separation[J],2021,21(9).
APA	Mikhailov E.F..,Pöhlker M.L..,Reinmuth-Selzle K..,Vlasenko S.S..,Krüger O.O..,...&Pöschl U..(2021).Water uptake of subpollen aerosol particles: Hygroscopic growth, cloud condensation nuclei activation, and liquid-liquid phase separation.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(9).
MLA	Mikhailov E.F.,et al."Water uptake of subpollen aerosol particles: Hygroscopic growth, cloud condensation nuclei activation, and liquid-liquid phase separation".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.9(2021).