气候变化领域集成服务门户(CCPortal): Laboratory investigation of aerosol coating and capillarity effects on particle ice nucleation in deposition and condensation modes

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DOI	10.1016/j.atmosres.2019.104633
	Laboratory investigation of aerosol coating and capillarity effects on particle ice nucleation in deposition and condensation modes
	Belosi F.; Santachiara G.
发表日期	2019
ISSN	0169-8095
卷号	230
英文摘要	In this work, the ice nucleating effectiveness of Arizona Test Dust (ATD), bare and coated with NaCl, not examined in previous published papers, was investigated. The ATD, NaCl coated ATD, and NaCl aerosols were generated by nebulizing water suspensions of bare ATD, ATD-NaCl and NaCl solution. Dried aerosols were sampled on black-gridded cellulose nitrate membrane filters for ice nuclei assessment through a Dynamic Filter Processing Chamber device (DFPC). After water evaporation ATD-NaCl droplets gave rise to ATD particles coated with NaCl. Processing of filters was performed at −22 °C and − 18 °C, under sub- and super-saturated conditions (water saturation ratio Sw < 1 and Sw > 1, respectively). Additional experiments were performed by modifying the storage conditions of the filters to simulate variation of atmospheric conditions, i.e. air temperature and relative humidity. For this purpose, the filters were housed in Petri dishes, with silica gel, at +10 °C and −10 °C. As silica gel can desorb water from the aerosol capillary at low temperatures, storage conditions with and without silica gel can simulate the aerosol pre-activation atmospheric process. The highest activated fraction (AF) and ice-active surface site density (ns) values were obtained for ATD at −22 °C and Sw = 1.02. Results showed a decrease in the AF and ns between bare and ATD coated with NaCl both at Sw = 1.02 and Sw = 0.96 and for filters stored in the presence of silica gel. The results obtained show the great influence exerted by NaCl coated insoluble aerosol on the ice nucleation. © 2019 Elsevier B.V.
英文关键词	Activated fraction; Aerosol aging; Aerosol pre-activation; Ice nucleating particles; Ice nucleating site density
语种	英语
scopus关键词	Aerosols; Atmospheric humidity; Chemical activation; Nucleation; Silica; Silica gel; Sodium chloride; Activated fraction; Active surface sites; Additional experiments; Aerosol aging; Atmospheric conditions; Cellulose nitrate membrane filters; Laboratory investigations; Nucleating sites; Ice; aerosol; atmospheric deposition; condensation; evaporation; ice crystal; laboratory method; saturation; sodium chloride; Aerosols; Ice; Nucleation; Silica Gel; Sodium Chloride
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162010
作者单位	Institute of Atmospheric Sciences and Climate, ISAC-CNR, via Gobetti, Bologna, 40129, Italy
推荐引用方式 GB/T 7714	Belosi F.,Santachiara G.. Laboratory investigation of aerosol coating and capillarity effects on particle ice nucleation in deposition and condensation modes[J],2019,230.
APA	Belosi F.,&Santachiara G..(2019).Laboratory investigation of aerosol coating and capillarity effects on particle ice nucleation in deposition and condensation modes.Atmospheric Research,230.
MLA	Belosi F.,et al."Laboratory investigation of aerosol coating and capillarity effects on particle ice nucleation in deposition and condensation modes".Atmospheric Research 230(2019).