气候变化领域集成服务门户(CCPortal): Aerodynamic size-resolved composition and cloud condensation nuclei properties of aerosols in a Beijing suburban region

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DOI	10.5194/acp-22-4375-2022
	Aerodynamic size-resolved composition and cloud condensation nuclei properties of aerosols in a Beijing suburban region
	Yu, Chenjie; Liu, Dantong; Hu, Kang; Tian, Ping; Wu, Yangzhou; Zhao, Delong; Wu, Huihui; Hu, Dawei; Guo, Wenbo; Li, Qiang; Huang, Mengyu; Ding, Deping; Allan, James D.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	4375
结束页码	4391
卷号	22 期号:7 页码:17
英文摘要	The size-resolved physiochemical properties of aerosols determine their atmospheric lifetime, cloud interactions and the deposition rate on the human respiratory system; however most atmospheric composition studies tend to evaluate these properties in bulk. This study investigated size-resolved constituents of aerosols on mass and number basis, and their droplet activation properties, by coupling a suite of online measurements with an aerosol aerodynamic classifier (AAC) based on aerodynamic diameter (D-a) in Pinggu, a suburb of Beijing. While organic matter accounted for a large fraction of mass, a higher contribution of particulate nitrate at larger sizes (D-a > 300 nm) was found under polluted cases. By considering the mixing state of refractory-black-carbon-containing particles (rBCc) and composition-dependent densities, aerosols including rBCc were confirmed to be nearly spherical at D-a > 300 nm. Importantly, the number fraction of rBCc was found to increase with D-a at all pollution levels. The number fraction of refractory black carbon (rBC) is found to increase from similar to 3 % at similar to 90 nm to similar to 15 % at similar to 1000 nm, and this increasing rBC number fraction may be caused by the coagulation during atmospheric ageing. The droplet activation diameter at a water supersaturation of 0.2 % was 112 +/- 6 and 193 +/- 41 nm for all particles with D-a smaller than 1 mu m (PM1) and rBCc respectively. As high as 52 +/- 6 % of rBCc and 50 +/- 4 % of all PM1 particles in number could be activated under heavy pollution due to enlarged particle size, which could be predicted by applying the volume mixing of substance hygroscopicity within rBCc. As rBCc contribute to the quantity of aerosols at larger particle size, these thickly coated rBCc may contribute to the radiation absorption significantly or act as an important source of cloud condensation nuclei (CCN). This size regime may also exert important health effects due to their higher deposition rate.
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:000778127900001
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/273563
作者单位	Zhejiang University; University of Manchester; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC National Centre for Atmospheric Science; University of Manchester
推荐引用方式 GB/T 7714	Yu, Chenjie,Liu, Dantong,Hu, Kang,et al. Aerodynamic size-resolved composition and cloud condensation nuclei properties of aerosols in a Beijing suburban region[J],2022,22(7):17.
APA	Yu, Chenjie.,Liu, Dantong.,Hu, Kang.,Tian, Ping.,Wu, Yangzhou.,...&Allan, James D..(2022).Aerodynamic size-resolved composition and cloud condensation nuclei properties of aerosols in a Beijing suburban region.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(7),17.
MLA	Yu, Chenjie,et al."Aerodynamic size-resolved composition and cloud condensation nuclei properties of aerosols in a Beijing suburban region".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.7(2022):17.