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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 of1.3 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 A?ngstro¨m exponent(AAE) for ambient aerosol are determined for characterizing the component of the ambient aerosol.
The atmospheric aerosol absorption capacity is a critical parameter determining its direct and indirect effects on climate. 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. through measuring the OACs of atmospheric nigrosin and ambient aerosols in the suburbs of Hefei city. The absorption cross section and absorption A? ngstro ¨ m exponent (AAE) for ambient aerosol are determined for characterizing the component of the ambient aerosol.