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Modified analytic expression for the single-scattering phase function
Cheng Chen1,2; Shi Ze-Lin3; Cui Sheng-Cheng1; Xu Qing-Shan1
2017-09-20
发表期刊ACTA PHYSICA SINICA
卷号66期号:18页码:1-13
摘要In electromagnetic radiative transfer calculation, the accuracy and the computation time are usually determined by the representation of single-scattering phase function. Accurate calculation is time consuming even for spherical particle, thus, an analytic representation is commonly adopted to approximate the exact phase function and then accelerate the calculation. Most widely used single-scattering phase functions are the Henyey-Greenstein phase function and modified Henyey-Greenstein phase function (Henyey-Greenstein*). Although the Henyey-Greenstein phase function and the Henyey-Greenstein* phase function can represent the forward-scattering peak of Mie-scattering phase function well, they fail to reproduce the backscattering behavior, limiting the accuracy of the calculation. In order to better fit exact calculations and simulate the backward-scattering peak, we develop a new analytic expression based on the fundamental theory of electromagnetic scattering and radiation transmission. This phase function is an algebraic expression with one single free parameter (asymmetry factor), and can be expanded into Legendre polynomials. The new phase function converges to the Rayleigh phase function when the asymmetry factor approximates to 0, and it can approach to the Henyey-Greenstein phase function as the asymmetry factor is about 1. We compare the Henyey-Greenstein phase function, the Henyey-Greenstein* phase function, and the new phase function for different asymmetry factors, and find that the new phase function provides a more realistic description for the unpolarized light scattering from small particles. Furthermore, the calculated value for the ratio of the scattering intensity at 90 degree to that in the backward direction is more reasonable. We also investigate the effectiveness by approximating the scattering from polydispersed particles through comparing the new phase function, the Henyey-Greenstein* phase function, and the Mie-scattering phase function for three types of Derimendjian's polydispersions. Results show that the new phase function fits the Mie-scattering phase function much better than the Henyey-Greenstein* phase function. For the new phase function, the root-mean-square error is small for 73.3% data. By contrast, only 26.7% data fit the Mie-scattering phase function well for the Henyey-Greenstein* phase function. Similarly, the effectiveness of new function is most significant when calculating the ratio of the scattering intensity at 90 degree to that in the backward direction. In summary, the new Henyey-Greenstein* phase function provides a more accurate calculation for the scattering intensity in the backward direction, and is conducive to electromagnetic radiative transfer calculation. Furthermore, because the proposed phase function has the same basic form as the Heny-Greenstein phase function, reformatting radiative transfer model in terms of the new phase function should require relatively little effort.
文章类型Article
关键词Scattering Phase Function Henyey-greenstein Phase Function New Henyey-greenstein Phase Function
WOS标题词Science & Technology ; Physical Sciences
资助者China Special Fund for Meteorological Research in the Public Interest(GYHY201106002-03) ; National Natural Science Foundation of China(41576185) ; China Special Fund for Meteorological Research in the Public Interest(GYHY201106002-03) ; National Natural Science Foundation of China(41576185)
DOI10.7498/aps.66.180201
关键词[WOS]ATMOSPHERIC AEROSOL
收录类别SCI
语种英语
资助者China Special Fund for Meteorological Research in the Public Interest(GYHY201106002-03) ; National Natural Science Foundation of China(41576185) ; China Special Fund for Meteorological Research in the Public Interest(GYHY201106002-03) ; National Natural Science Foundation of China(41576185)
WOS研究方向Physics
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000412844500001
引用统计
文献类型期刊论文
条目标识符http://ir.hfcas.ac.cn:8080/handle/334002/33797
专题中科院安徽光学精密机械研究所
作者单位1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Atmospher Composit & Opt Radiat, Hefei 230031, Anhui, Peoples R China
2.Univ Sci & Technol China, Grad Sch, Sci Isl Branch, Hefei 230031, Anhui, Peoples R China
3.Chinese Acad Sci, Shenyang Inst Automat, Shenyang 110016, Liaoning, Peoples R China
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GB/T 7714
Cheng Chen,Shi Ze-Lin,Cui Sheng-Cheng,et al. Modified analytic expression for the single-scattering phase function[J]. ACTA PHYSICA SINICA,2017,66(18):1-13.
APA Cheng Chen,Shi Ze-Lin,Cui Sheng-Cheng,&Xu Qing-Shan.(2017).Modified analytic expression for the single-scattering phase function.ACTA PHYSICA SINICA,66(18),1-13.
MLA Cheng Chen,et al."Modified analytic expression for the single-scattering phase function".ACTA PHYSICA SINICA 66.18(2017):1-13.
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