气候变化领域集成服务门户(CCPortal): The effects of morphology; mobility size; and secondary organic aerosol (SOA) material coating on the ice nucleation activity of black carbon in the cirrus regime

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DOI	10.5194/acp-20-13957-2020
	The effects of morphology; mobility size; and secondary organic aerosol (SOA) material coating on the ice nucleation activity of black carbon in the cirrus regime
	Zhang C.; Zhang Y.; Wolf M.J.; Nichman L.; Shen C.; Onasch T.B.; Chen L.; Cziczo D.J.
发表日期	2020
ISSN	1680-7316
起始页码	13957
结束页码	13984
卷号	20 期号:22
英文摘要	There is evidence that black carbon (BC) particles may affect cirrus formation and, hence, global climate by acting as potential ice nucleating particles (INPs) in the troposphere. Nevertheless, the ice nucleation (IN) ability of bare BC and BC coated with secondary organic aerosol (SOA) material remains uncertain. We have systematically examined the IN ability of 100–400 nm size-selected BC particles with different morphologies and different SOA coatings representative of anthropogenic (toluene and n-dodecane) and biogenic (β-caryophyllene) sources in the cirrus regime (−46 to −38 ◦C). Several BC proxies were selected to represent different particle morphologies and oxidation levels. Atmospheric aging was further replicated with the exposure of SOA-coated BC to OH. The results demonstrate that the 400 nm hydrophobic BC types nucleate ice only at or near the homogeneous freezing threshold. Ice formation at cirrus temperatures below homogeneous freezing thresholds, as opposed to purely homogeneous freezing, was observed to occur for some BC types between 100 and 200 nm within the investigated temperature range. More fractal BC particles did not consistently act as superior INPs over more spherical ones. SOA coating generated by oxidizing β-caryophyllene with O3 did not seem to affect BC IN ability, probably due to an SOA-phase state transition. However, SOA coatings generated from OH oxidation of various organic species did exhibit higher IN-onset supersaturation ratio with respect to ice (SSi), compared with bare BC particles, with the toluene-SOA coating showing an increase in SSi of 0.1–0.15 while still below the homogeneous freezing threshold. Slightly oxidized toluene SOA coating seemed to have a stronger deactivation effect on BC IN ability than highly oxidized toluene SOA, which might be caused by oligomer formation and the phase state transition of toluene SOA under different oxidation levels. n-dodecane and β-caryophyllene-derived SOA-coated BC only froze in the homogeneous regime. We attribute the inhibition of IN ability to the filling of the pores on the BC surface by the SOA material coating. OH exposure levels of n-dodecane and β-caryophyllene SOA coating experiments, from an equivalent atmospheric exposure time from 10 to 90 d, did not render significant differences in the IN potential. Our study of selected BC types and sizes suggests that increases in diameter, compactness, and/or surface oxidation of BC particles lead to more efficient IN via the pore condensation freezing (PCF) pathway, and that coatings of common SOA materials can inhibit the formation of ice. © Author(s) 2020. This work is distributed under
英文关键词	black carbon; cirrus; freezing; ice; nucleation; particle size
语种	英语
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/168954
作者单位	School of Energy and Power Engineering, Beihang University, Beijing, China; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, United States; Aerodyne Research Incorporated, Billerica, MA 01821, United States; Department of Chemistry, Boston College, Chestnut Hill, MA 02467, United States; Flight Research Laboratory, National Research Council Canada, Ottawa, ON K1V 9B4, Canada; Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China; Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, MA, Cambridge, 02139, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States; Department of Atmospheric Sciences, Texas A&M University, College Station, TX 778...
推荐引用方式 GB/T 7714	Zhang C.,Zhang Y.,Wolf M.J.,et al. The effects of morphology; mobility size; and secondary organic aerosol (SOA) material coating on the ice nucleation activity of black carbon in the cirrus regime[J],2020,20(22).
APA	Zhang C..,Zhang Y..,Wolf M.J..,Nichman L..,Shen C..,...&Cziczo D.J..(2020).The effects of morphology; mobility size; and secondary organic aerosol (SOA) material coating on the ice nucleation activity of black carbon in the cirrus regime.Atmospheric Chemistry and Physics,20(22).
MLA	Zhang C.,et al."The effects of morphology; mobility size; and secondary organic aerosol (SOA) material coating on the ice nucleation activity of black carbon in the cirrus regime".Atmospheric Chemistry and Physics 20.22(2020).