0601381 - ÚCHP 2025 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Suchánková, Lenka - Ondráček, Jakub - Roztočil, Petr - Prokeš, R. - Holoubek, I. - Ždímal, Vladimír
AN INNOVATIVE APPROACH TO MEASURE AEROSOL HYGROSCOPICITY USING SINGLE NEPHELOMETER SET-UP SYSTEM.
PROCEEDINGS OF 23rd Annual Conference of the Czech Aerosol Society OVZDUŠÍ V ČASe. Prague: Czech Aerosol Society, 2024, s. 42-44. ISBN 978-80-908653-2-7.
[SBORNÍK XXIII. výroční konference České aerosolové společnosti OVZDUŠÍ V ČASe. Milovy (CZ), 11.11.2024-13.11.2024]
Grant CEP: GA MŠMT(CZ) LM2023030
Institucionální podpora: RVO:67985858
Klíčová slova: scattering enhancement * aerosol optical properties * relative humidity
Obor OECD: Meteorology and atmospheric sciences

Hygroscopicity can be defined as the ability of aerosol particles to take up water molecules from the surrounding environment. This property affects the size, refractive index, chemical composition, and optical properties of the particles, as well as the formation and properties of clouds. The dependence of certain types of particles on relative humidity (RH) represents a critical factor in estimating the uncertainty of the direct and indirect effects of aerosols on the climate. One of the conventional methods for measuring aerosol hygroscopicity of aerosols is the observation of changes in light scattering properties with RH using an integrating nephelometer (IN). It is common practice to utilize a setup comprising one IN at dry and another at humidified conditions in parallel or in series. The outcome of such a measurement is the enhancement factor f(RH), defined as the ratio of the scattering coefficient σsp under humidified (>80%) and under dry conditions (<40%). However, the use of multiple instruments in such setups may lead to over- or underestimation of the f(RH). Furthermore, there is a lack of information about aerosol hygroscopic properties at European urban sites.
Trvalý link: https://hdl.handle.net/11104/0358538