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DOI | 10.1002/2016JD026249 |
The concept of apparent polarizability for calculating the extinction of electromagnetic radiation by porous aerosol particles | |
Haspel, C.1; Adler, G.2,3 | |
2017-04-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | Israel; USA |
英文摘要 | In the current study, the electromagnetic properties of porous aerosol particles are calculated in two ways. In the first, a porous target input file is generated by carving out voids in an otherwise homogeneous particle, and the discrete dipole approximation (DDA) is used to compute the extinction efficiency of the particle assuming that the voids are near vacuum dielectrics and assuming random particle orientation. In the second, an effective medium approximation (EMA) style approach is employed in which an apparent polarizability of the voids is defined based on the well-known solution to the problem in classical electrostatics of a spherical cavity within a dielectric. It is found that for porous particles with smaller overall diameter with respect to the wavelength of incident radiation, describing the voids as near vacuum dielectrics within the DDA sufficiently reproduces measured values of extinction efficiency, whereas for porous particles with moderate to larger overall diameters with respect to the wavelength of the radiation, the apparent polarizability EMA approach better reproduces the measured values of extinction efficiency. |
英文关键词 | aerosol porosity organic glassy scattering extinction |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400172000015 |
WOS关键词 | DISCRETE-DIPOLE APPROXIMATION ; OPTICAL-PROPERTIES ; DIELECTRIC-CONSTANT ; INTERSTELLAR GRAINS ; WAVE-PROPAGATION ; LIGHT-SCATTERING ; COMPOSITE ; POROSITY ; SULFATE ; CLOUDS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32509 |
专题 | 气候变化 |
作者单位 | 1.Hebrew Univ Jerusalem, Fredy & Nadine Herrmann Inst Earth Sci, Jerusalem, Israel; 2.NOAA, Chem Sci Div, Earth Syst Res Lab, Boulder, CO USA; 3.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Haspel, C.,Adler, G.. The concept of apparent polarizability for calculating the extinction of electromagnetic radiation by porous aerosol particles[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(7). |
APA | Haspel, C.,&Adler, G..(2017).The concept of apparent polarizability for calculating the extinction of electromagnetic radiation by porous aerosol particles.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(7). |
MLA | Haspel, C.,et al."The concept of apparent polarizability for calculating the extinction of electromagnetic radiation by porous aerosol particles".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.7(2017). |
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