The paper discusses wintertime synchronous near-ground measurements of the aerosol absorption coefficient at wavelengths of 532 and 1064 nm and the black carbon mass concentration by pulsed photoacoustic (PA) spectroscopy and optical aethalometry, respectively. It was found that the signal of the pulsed PA spectrometer decreases monotonically, by 30–40% on average, as the relative air humidity increases from 30 to 90%. Analysis of the data has shown that the PA method is efficient for studying the absorption of laser radiation in the range of low humidity values, i.e., for measurements of the aerosol absorption coefficient of “dry” carbonaceous particles. Correctness of the aerosol absorption measurements for increased relative air humidity (60–90%) can be improved through a sensitivity correction (additional calibration) of PA spectrometers.
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Original Russian Text © V.S. Kozlov, M.V. Panchenko, A.B. Tikhomirov, B.A. Tikhomirov, V.P. Shmargunov, 2011, published in Optica Atmosfery i Okeana.
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Kozlov, V.S., Panchenko, M.V., Tikhomirov, A.B. et al. Effect of relative air humidity on photoacoustic aerosol absorption measurements in the near-ground atmospheric layer. Atmos Ocean Opt 24, 487 (2011). https://doi.org/10.1134/S1024856011050101
- Black Carbon
- Atmospheric Aerosol
- Aerosol Absorption
- Aerosol Filter
- Water Vapor Molecule