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

0572498 - ÚVGZ 2024 GR eng A - Abstract
Suchánková, Lenka - Mbengue, Saliou - Zíková, Naděžda - Ondráček, Jakub - Holubová Šmejkalová, A. - Holoubek, Ivan - Ždímal, Vladimír - Prokeš, Roman
A seven-years based characterisation of aerosol light scattering properties at Central European
rural site: Variability and Source apportionment.
11th INTERNATIONAL AEROSOL CONFERENCE (IAC) Abstract book. Athens: Convin, 2022 - (Mihalopoulos, N.). s. 1084-1084
[11th INTERNATIONAL AEROSOL CONFERENCE (IAC). 04.09.2022-09.09.2022, Athens]
R&D Projects: GA MŠMT(CZ) LM2018123; GA MŠMT(CZ) LO1415
Institutional support: RVO:86652079 ; RVO:67985858
Keywords : aerosols * light scattering * climate change * long-range transport * source apportionment * temporal variability * naok
OECD category: Meteorology and atmospheric sciences
https://iac2022.gr/abstracts/

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 aerosol-cloud 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., the height of planetary boundary layer), 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.
Permanent Link: https://hdl.handle.net/11104/0343155