A seven-years based characterisation of aerosol light scattering properties at Central European rural site: Variability and Source apportionment

0572493 - ÚVGZ 2024 CZ eng A - Abstrakt
Suchánková, Lenka - Mbengue, Saliou - Zíková, Naděžda - Ondráček, Jakub - Holubová Šmejkalová, A. - Holoubek, Ivan - Prokeš, Roman - Ždímal, Vladimír
A seven-years based characterisation of aerosol light scattering properties at Central European rural site: Variability and Source apportionment.
SBORNÍK XXI. VÝROČNÍ KONFERENCE ČESKÉ AEROSOLOVÉ SPOLEČNOSTI. Česká aerosolová společnost, 2022 - (Lhotka, R.). s. 17-22. ISBN 978-80-908653-0-3.
[21stANNUAL CONFERENCE OF THE CZECH AEROSOL SOCIETY. 03.10.2022-04.10.2022, Kutná Hora]
Grant CEP: GA MŠMT(CZ) LM2018123; GA MŠMT(CZ) LO1415
Institucionální podpora: RVO:86652079 ; RVO:67985858
Klíčová slova: light scattering * aerosol * climate change * long-term measurement * naok * actris * temporal variability
Obor OECD: Meteorology and atmospheric sciences
http://cas.icpf.cas.cz/cas2022en.php

Atmospheric aerosols have a significant impact on the radiative forcing of Earth's climate, either directly through aerosol radiative interactions (ARIs), i.e., scattering or
absorption of incoming solar and outgoing infrared radiation, or indirectly through aerosolcloud interactions (ACIs) (Boucher, 2015, IPCC, 2013, Luoma et al., 2019, Ramanathan et al.,
2001). The aerosol radiative forcing of the direct effect consists of a warming effect and a cooling effect (Boucher et al., 2013,Charlson et al., 1992, IPCC et al., 2013). The predominant
cooling effect results from the scattering of radiation by certain species of atmospheric aerosols (including sea salts, nitrates, sulfates, mineral and organic matter, etc.) that reduce
the amount of solar radiation reaching the Earth's surface (IPCC, 2013). This phenomenon offsets the greenhouse effect and alters the radiation balance (Pandolfi et al., 2018).
According to a number of studies, radiative forcing by aerosols remains one of the main sources of uncertainty in a climate model estimation due to the strong spatial and
temporal variations in chemical and physical properties, short lifetime compared to greenhouse gasses, and diversity of aerosol sources (Boucher, 2015, Charlson et al., 1992,
Lee et al., 2016, Luoma et al., 2019). These studies are important for a better understanding of local and long-range transport of both anthropogenic pollutants and natural sources and
for unbiased long-term trends. The aim of this study is to focus on the temporal variations of light-scattering properties of aerosols at a rural site in Central Europe. The total light scattering (σsp) and backscattering (σbsp) coefficients and associated calculated optical properties such as the Ångström exponent (SAE), the backscattering ratio (b), and the asymmetry factor (g), are characterized considering different time scales (annual, seasonal, monthly, or diurnal) based on long-term measurement. The optical properties were compared with meteorological conditions (fog, cloudiness), the concentration of gaseous pollutants such as NOx and SO2 was inspected as well as potential sources of atmospheric aerosols. In addition, radiative forcing,and the influence of other meteorological conditions (e.g., height of planetary boundary ayer), chemical composition and particle size distribution at the National Atmospheric Observatory Košetice (NAOK) are being further investigated to better understand the direct effects of aerosols on the local climate.

Trvalý link: https://hdl.handle.net/11104/0343153