A seven-year-based characterization of aerosol light scattering properties at a rural Central European site

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F24%3A00579252" target="_blank" >RIV/67985858:_____/24:00579252 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/86652079:_____/24:00579944 RIV/00216224:14310/24:00135725

Výsledek na webu

<a href="https://hdl.handle.net/11104/0348098" target="_blank" >https://hdl.handle.net/11104/0348098</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.atmosenv.2023.120292" target="_blank" >10.1016/j.atmosenv.2023.120292</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A seven-year-based characterization of aerosol light scattering properties at a rural Central European site

Popis výsledku v původním jazyce

Our study investigates the temporal variability of aerosol light scattering properties measured at three wavelengths (total scattering coefficient, backscattering coefficient, Ångström scattering exponent, hemispheric backscattering ratio and asymmetry parameter) at the rural background site of the National Atmospheric Observatory Košetice over a period of over seven years (2012-2019). The influence of fog and cloudiness on aerosol light scattering properties (ASP), together with their comparison to particle number size distribution was also investigated. The overall medians of total scattering (σsp) and backscattering coefficient (σbsp), hemispheric backscattering ratio (b) and asymmetry parameter (g) measured at 550 nm and Ångström scatteringnexponent (SAE_450/700) were 35.20 Mm-1, 5.07 Mm-1, 0.14 and 0.57 and 1.82, respectively. σsp and g decreased by 2.05 Mm-1/year, and 0.009/year, respectively, whereas b increased by 0.004/year. The selected aerosol properties were strongly correlated with particle number, mass, area and volume concentrations in the 200-800 nm mode. A decrease in SAE_450/700 implies a shift towards larger particle sizes, and evolutions in b and g suggest a higher backscattering portion to total scattering. The highest σsp and σbsp levels were observed in the cold seasons together with higher concentrations of air pollutants (carbonaceous aerosol, SO2 and NOx). This could be explained by enhanced emissions from human activities such as domestic heating combined with the higher stability of the atmosphere (poor atmospheric dispersion). In the summer, decreases in particle size and higher rates of backscatter fraction were attributed to secondary organic aerosol (SOA) formation. The accumulation mode showed the strongest aerosol scattering potential, with SAE_450/700 values < 2. Aerosol light scattering was significantly higher during overcast and foggy days compared to fine, cloudy, partly cloudy and no-fog days possibly due to the particle hygroscopic growth and size distribution. Aerosol backscattering fraction was weaker during overcast and foggy days due to enhanced particle growth. Source identification linked the changes in ASP to the synoptic situation over Europe rather than to specificnsources of pollution.

Název v anglickém jazyce

A seven-year-based characterization of aerosol light scattering properties at a rural Central European site

Popis výsledku anglicky

Our study investigates the temporal variability of aerosol light scattering properties measured at three wavelengths (total scattering coefficient, backscattering coefficient, Ångström scattering exponent, hemispheric backscattering ratio and asymmetry parameter) at the rural background site of the National Atmospheric Observatory Košetice over a period of over seven years (2012-2019). The influence of fog and cloudiness on aerosol light scattering properties (ASP), together with their comparison to particle number size distribution was also investigated. The overall medians of total scattering (σsp) and backscattering coefficient (σbsp), hemispheric backscattering ratio (b) and asymmetry parameter (g) measured at 550 nm and Ångström scatteringnexponent (SAE_450/700) were 35.20 Mm-1, 5.07 Mm-1, 0.14 and 0.57 and 1.82, respectively. σsp and g decreased by 2.05 Mm-1/year, and 0.009/year, respectively, whereas b increased by 0.004/year. The selected aerosol properties were strongly correlated with particle number, mass, area and volume concentrations in the 200-800 nm mode. A decrease in SAE_450/700 implies a shift towards larger particle sizes, and evolutions in b and g suggest a higher backscattering portion to total scattering. The highest σsp and σbsp levels were observed in the cold seasons together with higher concentrations of air pollutants (carbonaceous aerosol, SO2 and NOx). This could be explained by enhanced emissions from human activities such as domestic heating combined with the higher stability of the atmosphere (poor atmospheric dispersion). In the summer, decreases in particle size and higher rates of backscatter fraction were attributed to secondary organic aerosol (SOA) formation. The accumulation mode showed the strongest aerosol scattering potential, with SAE_450/700 values < 2. Aerosol light scattering was significantly higher during overcast and foggy days compared to fine, cloudy, partly cloudy and no-fog days possibly due to the particle hygroscopic growth and size distribution. Aerosol backscattering fraction was weaker during overcast and foggy days due to enhanced particle growth. Source identification linked the changes in ASP to the synoptic situation over Europe rather than to specificnsources of pollution.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Atmospheric Environment

ISSN

1352-2310

e-ISSN

1873-2844

Svazek periodika

319

Číslo periodika v rámci svazku

15 February

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

120292

Kód UT WoS článku

001143824000001

EID výsledku v databázi Scopus

2-s2.0-85180417573