气候变化领域集成服务门户(CCPortal): Laboratory studies of ice nucleation onto bare and internally mixed soot-sulfuric acid particles

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DOI	10.5194/acp-22-5331-2022
	Laboratory studies of ice nucleation onto bare and internally mixed soot-sulfuric acid particles
	Gao, Kunfeng; Zhou, Chong-Wen; Meier, Eszter J. Barthazy; Kanji, Zamin A.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	5331
结束页码	5364
卷号	22 期号:8 页码:34
英文摘要	Soot particles are potential candidates for ice-nucleating particles in cirrus cloud formation, which is known to exert a net-warming effect on climate. Bare soot particles, generally hydrophobic and fractal ones, mainly exist near emission sources. Coated or internally mixed soot particles are more abundant in the atmosphere and have a higher probability of impacting cloud formation and climate. However, the ice nucleation ability of coated soot particles is not as well understood as that of freshly produced soot particles. In this laboratory study, two samples, a propane flame soot and a commercial carbon black, were used as atmospheric soot surrogates and coated with varying wt % of sulfuric acid (H2SO4). The ratio of coating material mass to the mass of bare soot particles was controlled and progressively increased from less than 5 wt % to over 100 wt %. Both bare and coated soot particle ice nucleation activities were investigated with a continuous-flow diffusion chamber operated at mixed-phase and cirrus cloud conditions. The mobility diameter and mass distribution of size-selected soot particles with/without H(2)SO(4 )coating were measured by a scanning mobility particle sizer and a centrifugal particle mass analyser running in parallel. The mixing state and morphology of soot particles were characterized by scanning electron microscopy and transmission electron microscopy. In addition, the evidence of the presence of H(2)SO(4 )on a coated soot particle surface is shown by energy-dispersive X-ray spectroscopy. Our study demonstrates that H(2)SO(4 )coatings suppress the ice nucleation activity of soot particles to varying degrees depending on the coating thickness, but in a non-linear fashion. Thin coatings causing pore filling in the soot aggregate inhibits pore condensation and freezing. Thick coatings promote particle ice activation via droplet homogeneous freezing. Overall, our findings reveal that H2SO4 coatings will suppress soot particle ice nucleation abilities in the cirrus cloud regime, having implications for the fate of soot particles with respect to cloud formation in the upper troposphere.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000785864500001
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/273081
作者单位	Beihang University; Beihang University; Swiss Federal Institutes of Technology Domain; ETH Zurich; Swiss Federal Institutes of Technology Domain; ETH Zurich
推荐引用方式 GB/T 7714	Gao, Kunfeng,Zhou, Chong-Wen,Meier, Eszter J. Barthazy,et al. Laboratory studies of ice nucleation onto bare and internally mixed soot-sulfuric acid particles[J],2022,22(8):34.
APA	Gao, Kunfeng,Zhou, Chong-Wen,Meier, Eszter J. Barthazy,&Kanji, Zamin A..(2022).Laboratory studies of ice nucleation onto bare and internally mixed soot-sulfuric acid particles.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(8),34.
MLA	Gao, Kunfeng,et al."Laboratory studies of ice nucleation onto bare and internally mixed soot-sulfuric acid particles".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.8(2022):34.