气候变化领域集成服务门户(CCPortal): Scattering matrices of mineral dust aerosols: A refinement of the refractive index impact

CCPortal

DOI	10.5194/acp-20-2865-2020
	Scattering matrices of mineral dust aerosols: A refinement of the refractive index impact
	Huang Y.; Liu C.; Yao B.; Yin Y.; Bi L.
发表日期	2020
ISSN	1680-7316
起始页码	2865
结束页码	2876
卷号	20 期号:5
英文摘要	Mineral dust, as one of the most important aerosols, plays a crucial role in the atmosphere by directly interacting with radiation, while there are significant uncertainties in determining dust optical properties to quantify radiative effects and to retrieve their properties. Laboratory and in situ measurements of the refractive indices (RIs) of dust differ, and different RIs have been applied in numerical studies used for model developments, aerosol retrievals, and radiative forcing simulations. This study reveals the importance of the dust RI for the development of a model of dust optical properties. The Koch-fractal polyhedron is used as the modeled geometry, and the pseudospectral time domain method and improved geometric-optics method are combined for optical property simulations over the complete size range. We find that the scattering matrix elements of different kinds of dust particles are reasonably reproduced by choosing appropriate RIs, even when using a fixed particle geometry. The uncertainty of the RI would greatly affect the determination of the geometric model, as a change in the RI, even in the widely accepted RI range, strongly affects the shape parameters used to reproduce the measured dust scattering matrix elements. A further comparison shows that the RI influences the scattering matrix elements in a different way than geometric factors, and, more specifically, the P11, P12, and P22 elements seem more sensitive to the RI of dust. In summary, more efforts should be devoted to account for the uncertainties on the dust RI in modeling its optical properties, and the development of corresponding optical models can potentially be simplified by considering only variations over different RIs. Considerably more research, especially from direct measurements, should be carried out to better constrain the uncertainties related to the dust aerosol RIs. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; aerosol composition; computer simulation; mineral dust; optical depth; radiative forcing; radiative transfer; refractive index; scattering
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/141492
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; Department of Atmospheric Sciences, Zhejiang University, Hangzhou, 310027, China
推荐引用方式 GB/T 7714	Huang Y.,Liu C.,Yao B.,et al. Scattering matrices of mineral dust aerosols: A refinement of the refractive index impact[J],2020,20(5).
APA	Huang Y.,Liu C.,Yao B.,Yin Y.,&Bi L..(2020).Scattering matrices of mineral dust aerosols: A refinement of the refractive index impact.Atmospheric Chemistry and Physics,20(5).
MLA	Huang Y.,et al."Scattering matrices of mineral dust aerosols: A refinement of the refractive index impact".Atmospheric Chemistry and Physics 20.5(2020).