Vol. 24, issue 04, article # 9

Kozlov V. S., Panchenko M. V., Tikhomirov A. B., Tikhomirov B. A., Shmargunov V. P. Influence of the relative air humidity on results of photoacoustic measurements of aerosol absorption in atmospheric air. // Optika Atmosfery i Okeana. 2011. V. 24. No. 04. P. 323-327 [in Russian].
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Abstract:

The paper discusses results of synchronous near-surface measurements of the aerosol absorption coefficient at wavelengths of 532 and 1064 nm and the mass concentration of Black Carbon by the methods of pulsed photoacoustic (PA) spectroscopy and optical aethalometry in the winter period. It has been found that as the relative air humidity increases from 30 to 90%, the signal of the pulsed PA spectrometer decreases monotonously, on the average, by 30-40%. The analysis of the data obtained has shown that the PA method is efficient for investigations of the laser radiation absorption in the range of low humidity values, that is, for mea-surements of the aerosol absorption coefficient of "dry" carbonaceous particles. For correct measurements of the aerosol absorption at an increased relative humidity of air (60-90%), the correction of the sensitivity (additional calibration) of PA spectrometers is necessary.

Keywords:

atmospheric submicron aerosol, soot, optical-acoustical spectrometer, aethalometer, relative humidity of air