DOI: 10.1016/j.atmosenv.2020.117338
论文题名: Insights into coarse particle optics based on field evidence of particle morphology, chemical composition and internal structure
作者: Goel V. ; Mishra S.K. ; Ahlawat A. ; Kumar P. ; Senguttuvan T.D. ; Sharma C. ; Reid J.S.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 232 语种: 英语
英文关键词: Aerosols
; Atmospheric radiation
; Budget control
; Copper
; Geochemistry
; Ion beams
; Morphology
; Refractive index
; Scanning electron microscopy
; Solar radiation
; Spheres
; Chemical compositions
; Comprehensive assessment
; Energy dispersive x-ray
; Particle morphologies
; Single scattering albedo
; Spaceborne observations
; Spectral refractive indices
; Volumetric composition
; Structure (composition)
; aluminum
; calcium
; carbon
; copper
; iron
; magnesium
; mercury
; nitrogen
; silver
; sulfur
; aerosol
; algorithm
; chemical composition
; instrumentation
; radiative forcing
; refractive index
; solar radiation
; uncertainty analysis
; aerosol
; algorithm
; Article
; chemical composition
; chemical structure
; energy dispersive X ray spectroscopy
; India
; light absorption
; model
; optics
; particle size
; priority journal
; radiative forcing
; refraction index
; scanning electron microscopy
; simulation
; solar radiation
; urban area
; Delhi
; India
; Jaisalmer
; Rajasthan
学科: 3D characterisation
; Aerosol particles
; Core-shell
; FIB-SEM-EDS
; Single scattering albedo
中文摘要: Aerosol particles scatter and absorb solar radiation and affects Earth's radiation budget. The aerosol particles are usually non-spherical in shape and inhomogeneous in chemical composition. For simplicity, these particles are approximated as homogeneous spheres/spheroids in radiative models and in retrieval algorithms of the ground and spaceborne observations. The lack of information on particle morphology (especially shape), chemical composition (that govern their spectral refractive indices) and most importantly internal structure (three Dimensional spatial distribution of chemical species) lead to uncertainty in the numerical estimation of their optical and radiative properties. Here, we present a comprehensive assessment of the particles' volumetric composition. The particles were collected from Jaisalmer (arid environment) and Delhi (urban environment) of India and subjected to Focused Ion-Beam (FIB) coupled with Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscope (EDS). Based on analysis of #2 particles from Jaisalmer, particles were observed to be composed of Fe, Ca, C, Al, Cu and Mg rich shell with Si and O rich core as opposed to those of Delhi particles (no #3) which were observed to be with Cu and S rich core and Hg, Ag, C, S and N rich shell. Based on the homogeneous sphere/spheroid assumption, conventional SEM-EDS and FIB-SEM-EDS results, different particle model shapes [single species homogeneous sphere (SP1) and spheroid (SPH1); multiple species homogeneously mixed sphere (SP2) and spheroid (SPH2); and core-shell (CS)] were considered for simulating their respective optical properties; SSA (Single Scattering Albedo) and g (Asymmetry parameter). The effect of internal structure on SSA was found to be prominent in particles having low value of the imaginary part of refractive index (k). While the same was observed to be low (nearly negligible) for the particle with the high value of k. The particles rich in copper are found to have high light absorbing property which causes positive radiative forcing. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160306
Appears in Collections: 气候变化与战略
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作者单位: Environmental Sciences and Biomedical Metrology Division, CSIR-National Physical Laboratory, New Delhi, 110012, India; Academy of Scientific and Innovative Research, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh 201002, India; Leibniz Institute for Tropospheric Research, Permoserstraße,15 Leipzig, Germany; Global Centre for Clean Air Research (GCARE), Department of Civil and Environmental Engineering, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom; United States Naval Research Laboratory, Washington DC, United States
Recommended Citation:
Goel V.,Mishra S.K.,Ahlawat A.,et al. Insights into coarse particle optics based on field evidence of particle morphology, chemical composition and internal structure[J]. Atmospheric Environment,2020-01-01,232