How do different types of photoacoustic extinctiometers calculate black carbon mass concentration?
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Different types of photoacoustic extinctiometers, such as the Photoacoustic Soot Spectrometer (PASS) and the Photoacoustic Aerosol Absorption Spectrometer (PAAS-4λ) , calculate black carbon (BC) mass concentration by measuring the light absorption coefficient of BC particles. These instruments are designed to be less sensitive to particle light scattering, providing high measurement precision and accuracy. The PASS operates at 880 nm and achieves a 1 σ detection limit of 0.8 µg m−3 for BC measurement, which can be further reduced to 0.1 µg m−3 with longer integration times. On the other hand, the PAAS-4λ has a low detection limit below 0.1 Mm-1 and has been validated for long-term monitoring in the European Arctic. Both instruments offer valuable capabilities for measuring BC mass concentration in real-time and are essential for understanding the impact of BC on climate forcing.
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| Different types of photoacoustic extinctiometers calculate black carbon mass concentration by converting aerosol absorption coefficient (babs) to mass concentrations of black carbon (MBC) using the mass absorption cross section (MAC). | |
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