Empirical Expression of Phase Function for Non-Spherical Particles | |
Cheng Chen1; Xu Qing-shan1; Zhu Lin1,2 | |
刊名 | SPECTROSCOPY AND SPECTRAL ANALYSIS |
2019 | |
卷号 | 39期号:1页码:1-7 |
关键词 | Non-spherical particle Phase function Empirical expression Backward scattering |
ISSN号 | 1000-0593 |
DOI | 10.3964/j.issn.1000-0593(2019)01-0001-07 |
英文摘要 | In electromagnetic radiative transfer calculations, the accuracy and the computation time are usually determined by the representation of scattering phase function. Accurate calculations are time consuming even for non-spherical particles. In order to get a better fit to exact calculations and simulate the backward-scattering peak of non-spherical particles, we developed a new empirical expression of non-spherical based on the fundamental theory of electromagnetic scattering and radiation transmission. This empirical expression of phase function is an algebraic expression with one single free parameter(asymmetry factor), and can be expanded into Legendre polynomials. We compared the Henyey-Greenstein* phase function and the new empirical expression with the T-matrix method for dustlike aerosol with different geometric shape, and found the new empirical expression provided a more realistic description for the scattering of non-spherical particles. Furthermore, the calculated value for ratio of scattering intensity at 90 degree to the scattered intensity in the backward direction is more reasonable when the ratio of the horizontal to rotational axes and the diameter-to-length ratio is larger than 0.5. We also investigated the effectiveness in approximating scattering from polydispersed particles by comparison between the new empirical expression, the Henyey-Greenstein* phase function and the T-matrix method for four of the log normal distribution polydispersions. The results show that the new empirical expression fits the T-matrix method much better than the Henyey-Greenstein* phase function. For the new empirical expression, the RMSE is small for 100% data except for the ellipsoidal oceanic aerosol at the wavelength of 633 nm. Similarly, the effectiveness of the new empirical expression is significant when we calculate the ratio of scattered intensity at 90 degree to the scattered intensity in the backward direction of non-spherical aerosol. In summary, the new empirical expression provides more accurate calculation for scattered intensity of non-spherical particles in the backward direction, and is helpful in electromagnetic radiative transfer calculations, and the reformatting radiative transfer models in terms of the new empirical expression should require relatively less effort. |
WOS研究方向 | Spectroscopy |
语种 | 英语 |
出版者 | OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS |
WOS记录号 | WOS:000456357000001 |
内容类型 | 期刊论文 |
源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/41506] |
专题 | 合肥物质科学研究院_中科院安徽光学精密机械研究所 |
通讯作者 | Xu Qing-shan |
作者单位 | 1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Ctr Fundamental Sci, Lab Photoelect Detect, Hefei 230031, Anhui, Peoples R China 2.Univ Sci & Technol China, Grad Sch, Sci Isl Branch, Hefei 230031, Anhui, Peoples R China |
推荐引用方式 GB/T 7714 | Cheng Chen,Xu Qing-shan,Zhu Lin. Empirical Expression of Phase Function for Non-Spherical Particles[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2019,39(1):1-7. |
APA | Cheng Chen,Xu Qing-shan,&Zhu Lin.(2019).Empirical Expression of Phase Function for Non-Spherical Particles.SPECTROSCOPY AND SPECTRAL ANALYSIS,39(1),1-7. |
MLA | Cheng Chen,et al."Empirical Expression of Phase Function for Non-Spherical Particles".SPECTROSCOPY AND SPECTRAL ANALYSIS 39.1(2019):1-7. |
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