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Naslov:In situ identification of aerosol types in Athens, Greece, based on long-term optical and on online chemical characterization
Avtorji:ID Kaskaoutis, Dimitris G. (Avtor)
ID Grivas, Georgios (Avtor)
ID Stavroulas, Iasonas (Avtor)
ID Liakakou, Eleni (Avtor)
ID Dumka, Umesh Chandra (Avtor)
ID Dimitriou, Konstantinos (Avtor)
ID Gerasopoulos, Evangelos (Avtor)
ID Mihalopoulos, Nikolaos (Avtor)
Datoteke:URL https://doi.org/10.1016/j.atmosenv.2020.118070
 
URL https://api.elsevier.com/content/article/PII:S1352231020308025?httpAccept=text/plain
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Absorption Ångström Exponent (AAE) and Scattering Ångström Exponent (SAE) values, derived from aethalometer and nephelometer measurements during a period of 3 years at an urban background site in Athens, are combined for the first aerosol type classification using in situ measurements in the eastern Mediterranean. In addition, single scattering albedo (SSA) and its wavelength dependence (dSSA), as well as the chemical composition of fine aerosols and precursor gases from collocated measurements, are utilized to provide further insights on the optical-chemical characterization and related sources of seven identified aerosol types. Urban aerosols are mostly characterized as Black Carbon (BC)-dominated (76.3%), representing a background atmosphere where fossil-fuel combustion is dominant throughout the year, while 14.3% of the cases correspond to the mixed Brown Carbon (BrC)-BC type, with a higher frequency in winter. The BrC type is associated with the highest scattering and absorption coefficients during winter nights, representing the impact from residential wood-burning emissions. Dust mixed with urban pollution (1.2%) and large particles mixed with BC (5.3%) have a higher frequency in spring. Furthermore, aging processes and BC coating with organic and inorganic species with weak spectral absorption (AAE<1) account for 2.2%, with a differentiation between small and large particles. dSSA is recognized as a useful parameter for aerosol characterization, since fine aerosols are associated with negative dSSA values. The identified aerosol types are examined on a seasonal, monthly, hourly basis and by potential source areas, as well as in comparison with fine-aerosol chemical composition and apportioned organic aerosol source contributions, in an attempt to explore the linkage between optical, physical and chemical aerosol properties. Chemical analysis indicates high organic fraction (60–68%) for the BrC and BrC/BC, 20–30% larger compared to other types. The results are essential for parametrization in chemical transport models and for reducing the uncertainty in the assessment of aerosol radiative effects.
Ključne besede:aerosol types, classification, AAE, SAE, dSSA, chemical composition, sources, Athens
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:01.02.2021
Leto izida:2021
Št. strani:str. 1-18
Številčenje:Vol. 246, [article no.] ǂ118070
PID:20.500.12556/RUNG-9042 Novo okno
ISSN:1352-2310
COBISS.SI-ID:195057155 Novo okno
UDK:53
ISSN pri članku:1352-2310
DOI:10.1016/j.atmosenv.2020.118070 Novo okno
NUK URN:URN:SI:UNG:REP:QO5ICN3M
Datum objave v RUNG:10.05.2024
Število ogledov:350
Število prenosov:2
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Gradivo je del revije

Naslov:Atmospheric environment
Skrajšan naslov:Atmos. environ.
Založnik:Pergamon
ISSN:1352-2310
COBISS.SI-ID:16086277 Novo okno

Licence

Licenca:Drugo
Opis:https://www.elsevier.com/tdm/userlicense/1.0/
Začetek licenciranja:01.02.2021

Licenca:Drugo
Opis:http://www.elsevier.com/open-access/userlicense/1.0/
Začetek licenciranja:21.01.2022

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