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The spectral light-absorbing behavior of carbonaceousaerosols varies depending on the chemical composition and structure of theparticles. A new single-cavity three-wavelength photoacoustic spectrometerwas developed and characterized for measuring absorption coefficients atthree wavelengths across the visible spectral range. In laboratory studies,several types of soot with different organic content were generated by adiffusion flame burner and were investigated for changes in mass-specificabsorption cross section (MAC) values, absorption and scattering Ångströmexponents (αabs and αsca), and single scatteringalbedo (ω). By increasing the organic carbonaceous (OC) content ofthe aerosol from 50 to 90 % of the total carbonaceous mass, for 660 nmnearly no change of MAC was found with increasing OC content. In contrast,for 532 nm a significant increase, and for 445 nm a strong increase of MAC was foundwith increasing OC content of the aerosol. Depending on the OC content, theÅngström exponents of absorption and scattering as well as thesingle scattering albedo increased. These laboratory results were comparedto a field study at a traffic-dominated urban site, which was alsoinfluenced by residential wood combustion. For this site a daily averagevalue of αabs(445–660) of 1.9 was found

A novel single-cavity three-wavelength photoacoustic spectrometer for atmospheric aerosol research