Multi-wavelength measurements of aerosol optical absorption coefficients using a photoacoustic spectrometer
Liu Qiang (刘强)a b, Huang Hong-Hua (黄宏华)b, Wang Yao (王尧)c, Wang Gui-Shi (王贵师)b d, Cao Zhen-Song (曹振松)b, Liu Kun (刘锟)b d, Chen Wei-Dong (陈卫东)e, Gao Xiao-Ming (高晓明)b d
a Department of Optics & Optical Engineering, University of Science and Technology of China, Hefei 230026, China; b Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences, Hefei 230031, China; c Institute for Environmental Reference Materials, Ministry of Environmental Protection, Beijing 100029, China; d Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; e Laboratoire de Physicochimie del'Atmosphére, Université du Littoral Côte d'Opale, 189A, Av, Maurice Schumann, 59140 Dunkerque, France
Abstract The atmospheric aerosol absorption capacity is a critical parameter determining its direct and indirect effects on climate. Accurate measurement is highly desired for the study of the radiative budget of the Earth. A multi-wavelength (405 nm, 532 nm, 780 nm) aerosol absorption meter based on photoacoustic spectroscopy (PAS) invovling a single cylindrical acoustic resonator is developed for measuring the aerosol optical absorption coefficients (OACs). A sensitivity of 1.3 Mm-1 (at 532 nm) is demonstrated. The aerosol absorption meter is successfully tested through measuring the OACs of atmospheric nigrosin and ambient aerosols in the suburbs of Hefei city. The absorption cross section and absorption Ångström exponent (AAE) for ambient aerosol are determined for characterizing the component of the ambient aerosol.
Fund: Project supported by the Open Research Fund of Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences, and the National Natural Science Foundation of China (Grant Nos. 41175036 and 41205120).
Liu Qiang (刘强), Huang Hong-Hua (黄宏华), Wang Yao (王尧), Wang Gui-Shi (王贵师), Cao Zhen-Song (曹振松), Liu Kun (刘锟), Chen Wei-Dong (陈卫东), Gao Xiao-Ming (高晓明) Multi-wavelength measurements of aerosol optical absorption coefficients using a photoacoustic spectrometer 2014 Chin. Phys. B 23 064205
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