气候变化领域集成服务门户(CCPortal): Constructing Shapes and Mixing Structures of Black Carbon Particles With Applications to Optical Calculations

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DOI	10.1029/2021JD034620
	Constructing Shapes and Mixing Structures of Black Carbon Particles With Applications to Optical Calculations
	Wang Y.; Pang Y.; Huang J.; Bi L.; Che H.; Zhang X.; Li W.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	Black carbon (BC) aerosols strongly absorb the solar radiation, affecting the regional and global climate through direct and indirect radiative forcing. The optical properties of BC are critical factors to estimate their radiative forcing. However, the optical absorption of BC is still under controversy partially due to the weakness in quantifying their complex morphology and mixing structures. Although a Discrete Dipole Approximation (DDA) can calculate optical properties of fine particles with arbitrary shapes, an appropriate definition of realistic BC shape models for optical simulation is essentially required. Here we present a novel Electron-Microscope-to-BC-Simulation (EMBS) tool to construct realistic BC shape models with various morphology and mixing structures for optical calculation using DDA. The optical properties of BC particles with different particle morphology, coating thickness, and embedded fraction (F) are estimated based on electron microscope. We find that absorption enhancement (Eabs) of the realistic irregular model is larger than that of the present commonly used spherical model (i.e., BC aggregate with spherical coating). The BC core morphology greatly influences Eabs of the embedded BC particles with irregular coating when the volume-equivalent-diameter ratio of particle to core (Dp/Dc) is larger than 1.8. The F significantly influences Eabs of BC particles, suggesting that the mixing structure between coating and core is an important factor to determine the optical absorption of aged BC particles. The study highlights that the BC core morphology, coating shape, coating thickness, and mixing structures influence their optical properties and should be considered as important variables in climate models. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	absorption enhancement; black carbon; Discrete Dipole Approximation (DDA); fractal dimension; mixing state
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185187
作者单位	Department of Atmospheric Science, School of Earth Sciences, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, Zhejiang University, Hangzhou, China; School of Computer Sciences, State Key Lab of CAD&CG, Zhejiang University, Hangzhou, China; Key Laboratory of Atmospheric Chemistry of CMA, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing, China
推荐引用方式 GB/T 7714	Wang Y.,Pang Y.,Huang J.,et al. Constructing Shapes and Mixing Structures of Black Carbon Particles With Applications to Optical Calculations[J],2021,126(10).
APA	Wang Y..,Pang Y..,Huang J..,Bi L..,Che H..,...&Li W..(2021).Constructing Shapes and Mixing Structures of Black Carbon Particles With Applications to Optical Calculations.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Wang Y.,et al."Constructing Shapes and Mixing Structures of Black Carbon Particles With Applications to Optical Calculations".Journal of Geophysical Research: Atmospheres 126.10(2021).