Measurement of optical properties of black carbon aerosols with the photoacoustic technique

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For the understanding and the prediction of the climate change, it is essential to measure the light absorption, or the atmospheric heating, by black carbon aerosols (BC). Although the BC light absorption can be enhanced with the coating of other material, high-precision measurement of BC light absorption and the enhancement with the coating is impossible with conventional techniques. This study succeeded in them by adopting photoacoustic technique measuring. In a laboratory experiment using artificial BC, the BC light absorption and the enhancement with the coating have been precisely measured to show that it increased by a factor between 1.5 and 2.0 with the thickness of the coating. In this study, the BC light absorption and the coating effect have also been measured.