Models for the optical simulations of fractal aggregated soot particles thinly coated with non-absorbing aerosols

	Models for the optical simulations of fractal aggregated soot particles thinly coated with non-absorbing aerosols
	Wu, Yu; Cheng, Tianhai; Zheng, Lijuan; Chen, Hao
刊名	Journal of Quantitative Spectroscopy and Radiative Transfer
	2016
卷号	182 页码:1-11
关键词	DISCRETE-DIPOLE APPROXIMATION SINGLE SCATTERING PROPERTIES T-MATRIX METHOD LIGHT-SCATTERING RADIATIVE PROPERTIES FRACTAL DIMENSION PRIMARY PARTICLE ABSORPTION AEROSOLS SIZE
通讯作者	Cheng, Tianhai (chength@radi.ac.cn)
英文摘要	Light absorption enhancement of aged soot aerosols is highly sensitive to the morphologies and mixing states of soot aggregates and their non-absorbing coatings, such as organic materials. The quantification of these effects on the optical properties of thinly coated soot aerosols is simulated using an effective model with fixed volume fractions. Fractal aggregated soot was simulated using the diffusion limited aggregation (DLA) algorithm and discretized into soot dipoles. The dipoles of non-absorbing aerosols, whose number was fixed by the volume fraction, were further generated from the neighboring random edge dipoles. Their optical properties were calculated using the discrete dipole approximation (DDA) method and were compared with other commonly used models. The optical properties of thinly coated soot calculated using the fixed volume fraction model are close to (less than ~10% difference) the results of the fixed coating thickness model, except their asymmetry parameters (up to ~25% difference). In the optical simulations of thinly coated soot aerosols, this relative difference of asymmetry parameters and phase functions between these realistic models may be notable. The realizations of the fixed volume fraction model may introduce smaller variation of optical results than those of the fixed coating thickness model. Moreover, the core-shell monomers model and homogeneous aggregated spheres model with the Maxwell-Garnett (MG) theory may underestimate (up to ~20%) the cross sections of thinly coated soot aggregates. The single core-shell sphere model may largely overestimate (up to ~150%) the cross sections and single scattering albedo of thinly coated soot aggregates, and it underestimated (up to ~60%) their asymmetry parameters. It is suggested that the widely used single core-shell sphere approximation may not be suitable for the single scattering calculations of thinly coated soot aerosols. © 2016 Elsevier Ltd.
学科主题	Optics; Spectroscopy
类目[WOS]	Optics ; Spectroscopy
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:20162202431317
内容类型	期刊论文
源URL	[http://ir.radi.ac.cn/handle/183411/39251]
专题	遥感与数字地球研究所_SCI/EI期刊论文_期刊论文
作者单位	State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, China
推荐引用方式 GB/T 7714	Wu, Yu,Cheng, Tianhai,Zheng, Lijuan,et al. Models for the optical simulations of fractal aggregated soot particles thinly coated with non-absorbing aerosols[J]. Journal of Quantitative Spectroscopy and Radiative Transfer,2016,182:1-11.
APA	Wu, Yu,Cheng, Tianhai,Zheng, Lijuan,&Chen, Hao.(2016).Models for the optical simulations of fractal aggregated soot particles thinly coated with non-absorbing aerosols.Journal of Quantitative Spectroscopy and Radiative Transfer,182,1-11.
MLA	Wu, Yu,et al."Models for the optical simulations of fractal aggregated soot particles thinly coated with non-absorbing aerosols".Journal of Quantitative Spectroscopy and Radiative Transfer 182(2016):1-11.