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

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.

Keywords: nonspherical aerosol light scattering pseudo-spectral time domain atmospheric radiative transfer

Received: 17 August 2017
Revised: 28 November 2017
Accepted manuscript online:

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

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.41575025 and 41575024).

Corresponding Authors: Taichang Gao
E-mail: 2009gaotc@gmail.com

Cite this article:

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 2018 Chin. Phys. B 27 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

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