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DOI	10.1016/j.atmosenv.2021.118358
	Can light absorption of black carbon still be enhanced by mixing with absorbing materials?
	Feng X.; Wang J.; Teng S.; Xu X.; Zhu B.; Wang J.; Zhu X.; Yurkin M.A.; Liu C.
发表日期	2021
ISSN	1352-2310
卷号	253
英文摘要	Strongly absorbing black carbon (BC) particles are commonly mixed with other aerosols in the ambient atmospheres, resulting in absorption enhancement known as the lensing effect. If other absorbing aerosols such as mineral dust and brown carbons (BrCs) are mixed with BC particles, resulting absorption properties are still less certain. Such mixtures are common due to large amounts of BrC (and tarballs) co-emitted with BC from biomass burning. Thus, this study focuses on mixtures of two absorbing carbonaceous aerosols with different spectral variations of absorption, and reveals the influences of mixing states on their absorption, especially on their spectral variation and enhancement. Three typical mixing states (internally, partially and externally mixed) and complex nonspherical BC structures (fractal aggregates) are considered accurately in the light scattering simulations. The absorption Angstrom exponent (AAE) of internally mixed particles can increase to over 2 when BrC volume fraction is above 70%, but it is systematically smaller (by up to 0.1) than those of the partially mixed and externally mixed particles. Different from non-absorbing coating acting as a lens, internal mixing of BC and BrC may not enhance BC absorption at shorter wavelengths, while the total absorption may even be reduced due to the “protection” of BC by the BrC coating, referred to as a “shielding effect”. Specifically, absorption enhancement in the case of internal mixing is sensitive to coating absorptivity (influenced by both its refractive index and volume fraction), and becomes close to or even smaller than 1 as the coating becomes more absorbing. Furthermore, the mixing states of two absorbing aerosols would surely affect absorption attribution as well as downstream estimations of BC heating effects. Thus, it should be carefully considered in future studies. © 2021 Elsevier Ltd
关键词	Absorbing aerosols Black carbon Brown carbon Light absorption enhancement
语种	英语
scopus关键词	Aerosols; Bromine compounds; Coatings; Light absorption; Light scattering; Mixing; Refractive index; Volume fraction; Absorbing aerosol; Absorption enhancement; Black carbon; Brown carbons; Carbon particle; Internal mixing; Light absorption enhancement; Mixed particles; Mixing state; Spectral variation; Carbon; black carbon; absorption; aerosol; ambient air; biomass burning; black carbon; brown carbon; mineral dust; mixing; spectral analysis; aerosol; Article; light absorption; light scattering; priority journal; refraction index; simulation; volume
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/248474
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Science and Technology on Optical Radiation Laboratory, Beijing, 100854, China; Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Institutskaya str. 3, Novosibirsk, 630090, Russian Federation; Novosibirsk State University, Pirogova Str. 2, Novosibirsk, 630090, Russian Federation; Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China
推荐引用方式 GB/T 7714	Feng X.,Wang J.,Teng S.,et al. Can light absorption of black carbon still be enhanced by mixing with absorbing materials?[J],2021,253.
APA	Feng X..,Wang J..,Teng S..,Xu X..,Zhu B..,...&Liu C..(2021).Can light absorption of black carbon still be enhanced by mixing with absorbing materials?.ATMOSPHERIC ENVIRONMENT,253.
MLA	Feng X.,et al."Can light absorption of black carbon still be enhanced by mixing with absorbing materials?".ATMOSPHERIC ENVIRONMENT 253(2021).