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Real-Time Determination of Absorptivity of Ambient Particles in Urban Aerosol in Budapest, Hungary

Category: Aerosol Physics and Instrumentation

Volume: 16 | Issue: 1 | Pages: 1-10
DOI: 10.4209/aaqr.2015.05.0356
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Attila Nagy 1, Aladár Czitrovszky1, Attila Kerekes1, Miklós Veres1, Wladyslaw W. Szymanski2

  • 1 Wigner Research Centre for Physics, Konkoly Thege M. st. 29-33. H-1121 Budapest, Hungary
  • 2 Faculty of Physics, University of Vienna, Boltzmanngasse 5, Vienna A-1090, Austria

Highlights

Real-time determination of ambient particles’ absorptivity and size distribution.
Measurement of the absorption properties of urban aerosol with different instruments.
Assessment of light absorption by sub-micrometer particles.
Determination of the absorbing fraction and the refractive index of ambient aerosol.


Abstract

The absorption properties of ambient urban aerosols as well as their size distributions were measured in real-time using a dual wavelength optical particle spectrometer (DWOPS). A photoacoustic spectrometer (PAS) was simultaneously used to directly measure light absorptivity of the particles in question along with an Aethalometer and a commercial optical particle counter (OPC). The sizing performance of the DWOPS was compared with the commercial OPC unit showing very good agreement. The data from DWOPS, PAS and Aethalometer instruments are presented and show the potential of the DWOPS technique for a direct and simple assessment of the absorbing part of the complex refractive index of ambient particles as a function of particle size.

Keywords

Atmospheric particles Light absorption Refractive index Soot aerosol


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