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

Result code in 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>

Alternative codes found

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

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Atmospheric Environment

ISSN

1352-2310

e-ISSN

1873-2844

Volume of the periodical

319

Issue of the periodical within the volume

15 February

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

120292

UT code for WoS article

001143824000001

EID of the result in the Scopus database

2-s2.0-85180417573