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Naslov:Long-term variability, source apportionment and spectral properties of black carbon at an urban background site in Athens, Greece
Avtorji:ID Liakakou, Eleni (Avtor)
ID Stavroulas, Iasonas (Avtor)
ID Kaskaoutis, Dimitris G. (Avtor)
ID Grivas, Georgios (Avtor)
ID Paraskevopoulou, D. (Avtor)
ID Dumka, Umesh Chandra (Avtor)
ID Tsagkaraki, M. (Avtor)
ID Bougiatioti, Aikaterini (Avtor)
ID Oikonomou, K. (Avtor)
ID Sciare, J. (Avtor), et al.
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:This study aims to delineate the characteristics of Black Carbon (BC) in the atmosphere over Athens, Greece, using 4-year (May 2015–April 2019) Aethalometer (AE-33) measurements. The average BC concentration is 1.9 ± 2.5 μg m−3 (ranging from 0.1 to 32.7 μg m−3; hourly values), with a well-defined seasonality from 1.3 ± 1.1 μg m−3 in summer to 3.0 ± 4.0 μg m−3 in winter. Pronounced morning and evening/night peaks are found in the BC concentrations in winter, while during the rest of the seasons, this diurnal cycle appears to flatten out, with the exception of the morning traffic peak. On an annual basis, the biomass-burning fraction (BB%) of BC accounts for 22 ± 12%, while the fossil-fuel combustion (BCff) component (traffic emissions and domestic heating) dominates during summer (83%) and in the morning hours. BCwb exhibits higher contribution in winter (32%), especially during the night hours (39%). BC levels are effectively reduced by precipitation, while they significantly build-up for wind speeds <3 m s−1 and mixing-layer height (MLH) < 500 m. Normalizing the BC diurnal course by the MLH variations on a seasonal basis reveals that the residential wood-burning emissions are mostly responsible for the large BC increase during winter nights, whereas the low BC levels during daytime in the warm season are mainly attributed to dilution into a deeper MLH. BCwb is highly correlated with other BB tracers during winter nights (e.g. levoglucosan, non-sea-salt-K+, m/z 60 fragment), as well as with the fine fraction (PM2.5) OC and EC. The Delta-C, which represents the spectral dependence of BC as the absorption difference between 370 and 880 nm, is analyzed for the first time in Athens. It exhibits a pronounced seasonality with maximum values in winter night-time, and it appears as a valid qualitative marker for wood combustion.
Ključne besede:black carbon, wood burning, source apportionment, mixing layer, biomass burning tracers, Athens
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:01.02.2020
Leto izida:2020
Št. strani:str. 1-14
Številčenje:Vol. 222, [article no.] ǂ117137
PID:20.500.12556/RUNG-9054 Novo okno
COBISS.SI-ID:195088387 Novo okno
ISSN pri članku:1352-2310
DOI:10.1016/j.atmosenv.2019.117137 Novo okno
Datum objave v RUNG:10.05.2024
Število ogledov:362
Število prenosov:1
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Gradivo je del revije

Naslov:Atmospheric environment
Skrajšan naslov:Atmos. environ.
COBISS.SI-ID:16086277 Novo okno


Začetek licenciranja:01.02.2020

Začetek licenciranja:19.01.2021