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DOI10.1029/2018JD028602
Microscopic Observations of Core-Shell Particle Structure and Implications for Atmospheric Aerosol Remote Sensing
Unga, Florin1,2; Choel, Marie2; Derimian, Yevgeny1; Deboudt, Karine3; Dubovik, Oleg1; Goloub, Philippe1
通讯作者Unga, Florin ; Derimian, Yevgeny
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2018
卷号123期号:24页码:13944-13962
英文摘要

Although atmospheric aerosol particles can have complex heterogeneous microstructure, simplified homogeneous particle models are often used in remote sensing applications. In this study, the internal structure of individual atmospheric particles was imaged with the aim of parameterizing particle structural heterogeneity. To this end, ambient urban pollution, desert dust, and biomass burning particles were sampled in northern Europe and western Africa and analyzed by transmission electron microscopy coupled with energy dispersive X-ray spectroscopy. Among 8,441 observed particles, about 60% of urban and 20% of desert dust particles presented residuals of coating compounds in the form of a halo surrounding a solid core. Graphic outlining of core and halo areas by image analysis revealed a dependence between halo and core dimensions as well as a greater ratio of halos thickness to total particle diameter (core plus halo) for smaller cores than for larger ones. In the case of urban pollution, the mean ratio for submicrometer and supermicrometer size fractions was 0.25 and 0.19, respectively. The corresponding mean values in the desert dust case were somewhat lower (0.22 and 0.14, respectively), but show a similar decreasing trend. Under the assumption that the halo dimension is proportional to the thickness of the particle shell, the obtained core versus shell dependencies were implemented in numerical calculations of aerosol optical characteristics. Different scenarios of the core-shell dependencies were analyzed with respect to the influence on aerosol optical characteristics, bringing insights into sensitivity to parameterization of the core-shell particle model in remote sensing algorithms.


英文关键词optical properties of core-shell aerosol particles core-shell aerosols parameterization in remote sensing algorithms microphysical properties and chemical composition of aerosols urban pollution desert dust TEM EDX
类型Article
语种英语
国家France
收录类别SCI-E
WOS记录号WOS:000455876300018
WOS关键词ATOMIC-FORCE MICROSCOPY ; MINERAL DUST PARTICLES ; OPTICAL-PROPERTIES ; BLACK-CARBON ; INDIVIDUAL-PARTICLE ; MIXING STATE ; CHEMICAL-COMPOSITION ; LIGHT-SCATTERING ; HETEROGENEOUS CHEMISTRY ; HYGROSCOPIC PROPERTIES
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210990
作者单位1.Univ Lille, CNRS, UMR 8518, LOA, Lille, France;
2.Univ Lille, CNRS, UMR 8516, LASIR,Lab Spectrochim Infrarouge & Raman, Lille, France;
3.Univ Littoral Cote dOpale, CNRS, EA 4493, LPCA, Dunkerque, France
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Unga, Florin,Choel, Marie,Derimian, Yevgeny,et al. Microscopic Observations of Core-Shell Particle Structure and Implications for Atmospheric Aerosol Remote Sensing[J],2018,123(24):13944-13962.
APA Unga, Florin,Choel, Marie,Derimian, Yevgeny,Deboudt, Karine,Dubovik, Oleg,&Goloub, Philippe.(2018).Microscopic Observations of Core-Shell Particle Structure and Implications for Atmospheric Aerosol Remote Sensing.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(24),13944-13962.
MLA Unga, Florin,et al."Microscopic Observations of Core-Shell Particle Structure and Implications for Atmospheric Aerosol Remote Sensing".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.24(2018):13944-13962.
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