@conference{
author = "Davidovic, Milos and Kleut, Duška and Davidović, Milena and Stojanović, Danka and Jovašević-Stojanović, Milena",
year = "2023",
abstract = "Atmospheric aerosols in urban areas typically consist of particles of different
diameters, which can range in size from a few nanometers to a few micrometers and can have
a strong impact on human health [1,2]. This motivates the need to measure aerosol
concentration accurately, but it is often also necessary to combine results from several
instruments, with fundamentally different measurement principles. In this work, methods
based on the measurement of the electrical mobility of particles, for the range of diameters
from 10nm to 420nm, and the measurement of the equivalent optical diameter, for the range
of diameters from 300nm to 10um, were used. Combining the overlapping region in two size
distribution spectra can be used to infer equivalent optical properties of the ambient aerosol,
and examples of measured and combined spectra in several urban hot spots in Bay of Kotor
are analyzed in some detail. These examples will illustrate several aspects of urban aerosol
properties not readily available in a typical regulatory monitoring setting, such as distribution
of modes in number and mass concentration, as well as optical properties of measured aerosol.
As the main result, examples of combining particle size spectrums are presented. In the
process of combining the particle size spectra, it is possible to modify the distribution
obtained by optical measurements by searching for the optimal value of the refractive index
of the particles to obtain the best possible agreement with the size distribution obtained by
measuring the electrical mobility. An equivalent refractive index as well as the equivalent
shape factor of the ambient aerosol is obtained using Mie scattering theory as a theoretical
framework [3]. The measurement results from the mobile monitoring campaign in Bay of
Kotor in 2017 were used to elucidate the main principles of size spectrum combination, as
well as to showcase diversity of equivalent optical properties of urban aerosols.
Funding for this work has been provided by the EU H2020 Framework Programme for
research and innovation under grant agreement no 952433 (VIDIS); Ministry of Education,
Science and Technological Development of the Republic of Serbia under contract number
451-03-47/2023-01/ 200017 which is being realized in Vinca Institute of Nuclear Sciences.",
journal = "16th Photonics Workshop: Kopaonik, March 12-15",
title = "Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles selected examples from the Bay of Kotor",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3131"
}
