气候变化领域集成服务门户(CCPortal): Wintertime aerosol optical properties in Lanzhou; Northwest China: Emphasis on the rapid increase of aerosol absorption under high particulate pollution

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DOI	10.1016/j.atmosenv.2020.118081
	Wintertime aerosol optical properties in Lanzhou; Northwest China: Emphasis on the rapid increase of aerosol absorption under high particulate pollution
	Guan X.; Wang M.; Du T.; Tian P.; Zhang N.; Shi J.; Chang Y.; Zhang L.; Zhang M.; Song X.; Sun Y.
发表日期	2021
ISSN	1352-2310
卷号	246
英文摘要	The evolution of aerosol absorption and the contribution of absorbing species under different severities of particulate pollution are poorly understood, though absorption is key in aerosol radiative forcing. To resolve the problems, aerosol absorbing properties from low to high particulate pollution were investigated by using intensive observations of aerosol optical properties in the winter of 2019–2020 in Lanzhou, Northwest China. The aerosol scattering coefficient increased linearly with increasing particulate matter <2.5 μm in diameter (PM2.5) and the absorption coefficient increased more rapidly under higher particulate pollution, leading to rapid decline in single scattering albedo (SSA) and sharp increase in mass absorption efficiency of PM2.5 (MAEPM2.5). The SSA (MAEPM2.5) decreased (increased) from 0.87 (0.76) in the lowest PM2.5 bin to 0.82 (1.11) in the highest PM2.5 bin. The linear relationship between the scattering coefficient and PM2.5 was attributed to decreasing aerosol hygroscopicity with increasing PM2.5. Elemental carbon (EC), fine soils (FS), and organic carbon (OC) accounted for 77.4%, 16.6%, and 6.0% of the total aerosol absorption, respectively. From low to high particulate pollution levels, the contribution of EC absorption increased from 68.3% to 80.5% while that of FS decreased from 25.5% to 13.9%. The aerosol radiative forcing efficiency was strongly correlated with SSA. Our results show a unique rapid increase in aerosol absorption under high particulate pollution during winter in Lanzhou, which is opposite to the trends observed in eastern Chinese cities, where SSA increases with increasing PM2.5. © 2020 Elsevier Ltd
英文关键词	Aerosols; Air pollution; Atmospheric radiation; Efficiency; Optical properties; Organic carbon; Absorbing properties; Absorption co-efficient; Aerosol optical property; Aerosol radiative forcing; Aerosol scattering coefficient; Particulate pollution; Scattering co-efficient; Single scattering albedo; Particles (particulate matter)
语种	英语
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169096
作者单位	Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China; Collaborative Innovation Center for Western Ecological Safety, Lanzhou University, Lanzhou, 730000, China; Gansu Province Environmental Monitoring Center, Lanzhou, 730020, China
推荐引用方式 GB/T 7714	Guan X.,Wang M.,Du T.,et al. Wintertime aerosol optical properties in Lanzhou; Northwest China: Emphasis on the rapid increase of aerosol absorption under high particulate pollution[J],2021,246.
APA	Guan X..,Wang M..,Du T..,Tian P..,Zhang N..,...&Sun Y..(2021).Wintertime aerosol optical properties in Lanzhou; Northwest China: Emphasis on the rapid increase of aerosol absorption under high particulate pollution.Atmospheric Environment,246.
MLA	Guan X.,et al."Wintertime aerosol optical properties in Lanzhou; Northwest China: Emphasis on the rapid increase of aerosol absorption under high particulate pollution".Atmospheric Environment 246(2021).