Light-scattering model for aerosol particles with irregular shapes and inhomogeneous compositions using a parallelized pseudo-spectral time-domain technique

doi:10.1088/1674-1056/27/5/054215

中国物理B ›› 2018, Vol. 27 ›› Issue (5): 54215-054215.doi: 10.1088/1674-1056/27/5/054215

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Light-scattering model for aerosol particles with irregular shapes and inhomogeneous compositions using a parallelized pseudo-spectral time-domain technique

Shuai Hu(胡帅), Taichang Gao(高太长), Hao Li(李浩), Lei Liu(刘磊), Ming Chen(陈鸣), Bo Yang(杨波)

1 College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101 China;
2 National Key Laboratory on Electromagnetic Environment and Electro-optical Engineering, PLA University of Science and Technology, Nanjing 210007, China

收稿日期:2017-08-17 修回日期:2017-11-28 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: Taichang Gao E-mail:2009gaotc@gmail.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.41575025 and 41575024).

Light-scattering model for aerosol particles with irregular shapes and inhomogeneous compositions using a parallelized pseudo-spectral time-domain technique

Shuai Hu(胡帅)^1,2, Taichang Gao(高太长)^1,2, Hao Li(李浩)¹, Lei Liu(刘磊)¹, Ming Chen(陈鸣)¹, Bo Yang(杨波)^1,2

1 College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101 China;
2 National Key Laboratory on Electromagnetic Environment and Electro-optical Engineering, PLA University of Science and Technology, Nanjing 210007, China

Received:2017-08-17 Revised:2017-11-28 Online:2018-05-05 Published:2018-05-05
Contact: Taichang Gao E-mail:2009gaotc@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.41575025 and 41575024).

摘要/Abstract

摘要： To improve the modeling accuracy of radiative transfer, the scattering properties of aerosol particles with irregular shapes and inhomogeneous compositions should be simulated accurately. To this end, a light-scattering model for nonspherical particles is established based on the pseudo-spectral time domain (PSTD) technique. In this model, the perfectly matched layer with auxiliary differential equation (ADE-PML), an excellent absorption boundary condition (ABC) in the finite difference time domain generalized for the PSTD, and the weighted total field/scattered field (TF/SF) technique is employed to introduce the incident light into 3D computational domain. To improve computational efficiency, the model is further parallelized using the OpenMP technique. The modeling accuracy of the PSTD scheme is validated against Lorenz-Mie, Aden-Kerker, T-matrix theory and DDA for spheres, inhomogeneous particles and nonspherical particles, and the influence of the spatial resolution and thickness of ADE-PML on the modeling accuracy is discussed as well. Finally, the parallel computational efficiency of the model is also analyzed. The results show that an excellent agreement is achieved between the results of PSTD and well-tested scattering models, where the simulation errors of extinction efficiencies are generally smaller than 1%, indicating the high accuracy of our model. Despite its low spatial resolution, reliable modeling precision can still be achieved by using the PSTD technique, especially for large particles. To suppress the electromagnetic wave reflected by the absorption layers, a six-layer ADE-PML should be set in the computational domain at least.

关键词: nonspherical aerosol, light scattering, pseudo-spectral time domain, atmospheric radiative transfer

Abstract: To improve the modeling accuracy of radiative transfer, the scattering properties of aerosol particles with irregular shapes and inhomogeneous compositions should be simulated accurately. To this end, a light-scattering model for nonspherical particles is established based on the pseudo-spectral time domain (PSTD) technique. In this model, the perfectly matched layer with auxiliary differential equation (ADE-PML), an excellent absorption boundary condition (ABC) in the finite difference time domain generalized for the PSTD, and the weighted total field/scattered field (TF/SF) technique is employed to introduce the incident light into 3D computational domain. To improve computational efficiency, the model is further parallelized using the OpenMP technique. The modeling accuracy of the PSTD scheme is validated against Lorenz-Mie, Aden-Kerker, T-matrix theory and DDA for spheres, inhomogeneous particles and nonspherical particles, and the influence of the spatial resolution and thickness of ADE-PML on the modeling accuracy is discussed as well. Finally, the parallel computational efficiency of the model is also analyzed. The results show that an excellent agreement is achieved between the results of PSTD and well-tested scattering models, where the simulation errors of extinction efficiencies are generally smaller than 1%, indicating the high accuracy of our model. Despite its low spatial resolution, reliable modeling precision can still be achieved by using the PSTD technique, especially for large particles. To suppress the electromagnetic wave reflected by the absorption layers, a six-layer ADE-PML should be set in the computational domain at least.

Key words: nonspherical aerosol, light scattering, pseudo-spectral time domain, atmospheric radiative transfer

中图分类号: (Scattering, polarization)

42.68.Mj

42.68.Ay (Propagation, transmission, attenuation, and radiative transfer) 42.25.Bs (Wave propagation, transmission and absorption) 95.30.Jx (Radiative transfer; scattering)

胡帅, 高太长, 李浩, 刘磊, 陈鸣, 杨波. Light-scattering model for aerosol particles with irregular shapes and inhomogeneous compositions using a parallelized pseudo-spectral time-domain technique[J]. 中国物理B, 2018, 27(5): 54215-054215.

Shuai Hu(胡帅), Taichang Gao(高太长), Hao Li(李浩), Lei Liu(刘磊), Ming Chen(陈鸣), Bo Yang(杨波). Light-scattering model for aerosol particles with irregular shapes and inhomogeneous compositions using a parallelized pseudo-spectral time-domain technique[J]. Chin. Phys. B, 2018, 27(5): 54215-054215.

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Light-scattering model for aerosol particles with irregular shapes and inhomogeneous compositions using a parallelized pseudo-spectral time-domain technique

Light-scattering model for aerosol particles with irregular shapes and inhomogeneous compositions using a parallelized pseudo-spectral time-domain technique

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