气候变化领域集成服务门户(CCPortal): Laboratory study of the heterogeneous ice nucleation on black-carbon-containing aerosol

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DOI	10.5194/acp-19-12175-2019
	Laboratory study of the heterogeneous ice nucleation on black-carbon-containing aerosol
	Nichman L.; Wolf M.; Davidovits P.; Onasch T.B.; Zhang Y.; Worsnop D.R.; Bhandari J.; Mazzoleni C.; Cziczo D.J.
发表日期	2019
ISSN	16807316
起始页码	12175
结束页码	12194
卷号	19 期号:19
英文摘要	Soot and black carbon (BC) particles are generated in the incomplete combustion of fossil fuels, biomass, and biofuels. These airborne particles affect air quality, human health, aerosol-cloud interactions, precipitation formation, and climate. At present, the climate effects of BC particles are not well understood. Their role in cloud formation is obscured by their chemical and physical variability and by the internal mixing states of these particles with other compounds. Ice nucleation in field studies is often difficult to interpret. Nonetheless, most field studies seem to suggest that BC particles are not efficient ice-nucleating particles (INPs). On the other hand, laboratory measurements show that in some cases, BC particles can be highly active INPs under certain conditions. By working with well-characterized BC particles, our aim is to systematically establish the factors that govern the ice nucleation activity of BC. The current study focuses on laboratory measurements of the effectiveness of BC-containing aerosol in the formation of ice crystals in temperature and ice supersaturation conditions relevant to cirrus clouds. We examine ice nucleation on BC particles under watersubsaturated cirrus cloud conditions, commonly understood as deposition-mode ice nucleation. We study a series of wellcharacterized commercial carbon black particles with varying morphologies and surface chemistries as well as ethylene flame-generated combustion soot. The carbon black particles used in this study are proxies for atmospherically relevant BC aerosols. These samples were characterized by electron microscopy, mass spectrometry, and optical scattering measurements. Ice nucleation activity was systematically examined in temperature and saturation conditions in the ranges of 217 ≤ T ≤ 235 K and 1:0 ≤ Sice ≤ 1:5 and 0:59 ≤ Swater ≤ 0:98, respectively, using a SPectrometer for Ice Nuclei (SPIN) instrument, which is a continuous-flow diffusion chamber coupled with instrumentation to measure light scattering and polarization. To study the effect of coatings on INPs, the BC-containing particles were coated with organic acids found in the atmosphere, namely stearic acid, cis-pinonic acid, and oxalic acid. The results show significant variations in ice nucleation activity as a function of size, morphology, and surface chemistry of the BC particles. The measured ice nucleation activity dependencies on temperature, supersaturation conditions, and the physicochemical properties of the BC particles are consistent with an ice nucleation mechanism of pore condensation followed by freezing. Coatings and surface oxidation modify the initial formation efficiency of pristine ice crystals on BC-containing aerosol. Depending on the BC mate rial and the coating, both inhibition and enhancement in INP activity were observed. Our measurements at low temperatures complement published data and highlight the capability of some BC particles to nucleate ice under low ice supersaturation conditions. These results are expected to help refine theories relating to soot INP activation in the atmosphere. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; black carbon; ice crystal; laboratory method; nucleation; soot
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/144756
作者单位	Department of Chemistry, Boston College, Chestnut Hill, MA 02467, United States; Aerodyne Research Inc., Billerica, MA 01821, United States; Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, United States; Department of Physics and Atmospheric Sciences, Michigan Technological University, Houghton, MI 49931, United States; Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Flight Research Laboratory, National Research Council of Canada, Ottawa, ON K1V-9B4, Canada
推荐引用方式 GB/T 7714	Nichman L.,Wolf M.,Davidovits P.,et al. Laboratory study of the heterogeneous ice nucleation on black-carbon-containing aerosol[J],2019,19(19).
APA	Nichman L..,Wolf M..,Davidovits P..,Onasch T.B..,Zhang Y..,...&Cziczo D.J..(2019).Laboratory study of the heterogeneous ice nucleation on black-carbon-containing aerosol.Atmospheric Chemistry and Physics,19(19).
MLA	Nichman L.,et al."Laboratory study of the heterogeneous ice nucleation on black-carbon-containing aerosol".Atmospheric Chemistry and Physics 19.19(2019).