Retrieval of aerosol optical constants from angular light-scattering measurement signals using principal component analysis approach

作     者：Zhenzong He Junkui Mao Xingsi Han Hao Wang 

作者机构：Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2019年第17卷第2期

页      面：210-218页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the Jiangsu Provin-cial Natural Science Foundation (grant numbers BK20170800, BK20160794) the Fundamental Research Funds for the Central Universities (grant number 1022-YAH16051) and the National Natural Science Foundation of China (grant number 51606095). 

主　　题：Angular light-scattering measurement method Aerosol optical constant Ant colony optimization algorithm Principal comp orient analysis Inverse radiation problem 

摘      要：An angular light-scattering measurement (ALSM) method combined with the probability density function-bmsed ant colony optimization algorithm (PDF-ACO) is proposed for retrieval of aerosol optical constants. An optimal measurement angle selection method using a principal component analysis (PCA) approach is developed to improve retrieval accuracy. Results indicate that optimized angle selection can ensure retrieval accuracy. The aerosol optical constants over Beijing, China, which are available from the Aerosol Robotic Network (AERONET), are then rec on structed. The ALSM method s con vergence properties are also studied via comparison w让h those of the light reflection-transmittance measurement (LRTM) method. Results retrieved using the ALSM method show better convergence speed and accuracy than those retrieved using the LRTM method because the ALSM method does not require solution of the radiative transfer equation and allows more useful signals to be obtained. Additionally, the inverse accuracy of the refractive index results is better than that of the absorption index results;this is attributed to differences between the monodromic characteristics of the refractive index and absorption index retrieval results. All results confirm that the combination of the ALSM method w让h the PDF-ACO algorithm and the optimal measurement angle selection method provides effective and reliable aerosol optical constant reconstructio n.