Simultaneous estimation of aerosol optical constants and size distribution from angular light-scattering measurement signals

doi:10.1088/1674-1056/27/5/059101

Abstract The angular light-scattering measurement (ALSM) method combined with an improved artificial bee colony algorithm is introduced to determine aerosol optical constants and aerosol size distribution (ASD) simultaneously. Meanwhile, an optimized selection principle of the ALSM signals based on the sensitivity analysis and principle component analysis (PCA) is proposed to improve the accuracy of the retrieval results. The sensitivity analysis of the ALSM signals to the optical constants or characteristic parameters in the ASD is studied first to find the optimized selection region of measurement angles. Then, the PCA is adopted to select the optimized measurement angles within the optimized selection region obtained by sensitivity analysis. The investigation reveals that, compared with random selection measurement angles, the optimized selection measurement angles can provide more useful measurement information to ensure the retrieval accuracy. Finally, the aerosol optical constants and the ASDs are reconstructed simultaneously. The results show that the retrieval accuracy of refractive indices is better than that of absorption indices, while the characteristic parameters in ASDs have similar retrieval accuracy. Moreover, the retrieval accuracy in studying L-N distribution is a little better than that in studying Gamma distribution for the difference of corresponding correlation coefficient matrixes of the ALSM signals. All the results confirm that the proposed technique is an effective and reliable technique in estimating the aerosol optical constants and ASD simultaneously.

Keywords: angular light-scattering measurement method aerosol optical constants aerosol size distribution inverse radiation problem

Received: 26 December 2017
Revised: 15 January 2018
Accepted manuscript online:

PACS:	91.67.gp	(Aerosols and particles)
	65.80.-g	(Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)
	92.60.Mt	(Particles and aerosols)
	43.20.Ye	(Measurement methods and instrumentation)

Fund: Project supported by the Jiangsu Provincial Natural Science Foundation,China (Grant Nos.BK20170800 and BK20160794) and the National Natural Science Foundation of China (Grant No.51606095).

Corresponding Authors: Jun-Kui Mao
E-mail: mjkpe@nuaa.edu.cn

Cite this article:

Zhen-Zong He(贺振宗), Dong Liang(梁栋), Jun-Kui Mao(毛军逵), Xing-Si Han(韩省思) Simultaneous estimation of aerosol optical constants and size distribution from angular light-scattering measurement signals 2018 Chin. Phys. B 27 059101

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Simultaneous estimation of aerosol optical constants and size distribution from angular light-scattering measurement signals

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