气候变化领域集成服务门户(CCPortal): Heterogeneous ice nucleation properties of natural desert dust particles coated with a surrogate of secondary organic aerosol

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DOI	10.5194/acp-19-5091-2019
	Heterogeneous ice nucleation properties of natural desert dust particles coated with a surrogate of secondary organic aerosol
	Kanji Z.A.; Sullivan R.C.; Niemand M.; DeMott P.J.; Prenni A.J.; Chou C.; Saathoff H.; Möhler O.
发表日期	2019
ISSN	16807316
起始页码	5091
结束页码	5110
卷号	19 期号:7
英文摘要	Ice nucleation abilities of surface collected mineral dust particles from the Sahara (SD) and Asia (AD) are investigated for the temperature (T) range 253-233 K and for supersaturated relative humidity (RH) conditions in the immersion freezing regime. The dust particles were also coated with a proxy of secondary organic aerosol (SOA) from the dark ozonolysis of α-pinene to better understand the influence of atmospheric coatings on the immersion freezing ability of mineral dust particles. The measurements are conducted on polydisperse particles in the size range 0.01-3 μm with three different ice nucleation chambers. Two of the chambers follow the continuous flow diffusion chamber (CFDC) principle (Portable Ice Nucleation Chamber, PINC) and the Colorado State University CFDC (CSU-CFDC), whereas the third was the Aerosol Interactions and Dynamics in the Atmosphere (AIDA) cloud expansion chamber. From observed activated fractions (AFs) and ice nucleation active site (INAS) densities, it is concluded within experimental uncertainties that there is no significant difference between the ice nucleation ability of the particular SD and AD samples examined. A small bias towards higher INAS densities for uncoated versus SOA-coated dusts is found but this is well within the 1σ (66% prediction bands) region of the average fit to the data, which captures 75% of the INAS densities observed in this study. Furthermore, no systematic differences are observed between SOA-coated and uncoated dusts in both SD and AD cases, regardless of coating thickness (3-60 nm). The results suggest that any differences observed are within the uncertainty of the measurements or differences in cloud chamber parameters such as size fraction of particles sampled, and residence time, as well as assumptions in using INAS densities to compare polydisperse aerosol measurements which may show variable composition with particle size. Coatings with similar properties to that of the SOA in this work and with coating thickness up to 60 nm are not expected to impede or enhance the immersion mode ice nucleation ability of mineral dust particles. © Author(s) 2019.
语种	英语
scopus关键词	aerosol; desert; dust; ice crystal; mineral; nucleation; particle size; relative humidity; Asia; Sahara
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/144481
作者单位	Department of Environmental System Sciences, Institute for Atmospheric and Climate Science, ETH Zürich, Zurich, 8092, Switzerland; Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, United States; Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA 15213, United States; Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Germany; Air Resources Division, National Park Service, Lakewood, CO 80228, United States
推荐引用方式 GB/T 7714	Kanji Z.A.,Sullivan R.C.,Niemand M.,et al. Heterogeneous ice nucleation properties of natural desert dust particles coated with a surrogate of secondary organic aerosol[J],2019,19(7).
APA	Kanji Z.A..,Sullivan R.C..,Niemand M..,DeMott P.J..,Prenni A.J..,...&Möhler O..(2019).Heterogeneous ice nucleation properties of natural desert dust particles coated with a surrogate of secondary organic aerosol.Atmospheric Chemistry and Physics,19(7).
MLA	Kanji Z.A.,et al."Heterogeneous ice nucleation properties of natural desert dust particles coated with a surrogate of secondary organic aerosol".Atmospheric Chemistry and Physics 19.7(2019).