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Naslov:Optical properties of near-surface urban aerosols and their chemical tracing in a Mediterranean city (Athens)
Avtorji:ID Katsanos, Dimitris (Avtor)
ID Bougiatioti, Aikaterini (Avtor)
ID Liakakou, Eleni (Avtor)
ID Kaskaoutis, Dimitris G. (Avtor)
ID Stavroulas, Iasonas (Avtor)
ID Paraskevopoulou, D. (Avtor)
ID Lianou, Maria (Avtor)
ID Psiloglou, Basil E. (Avtor)
ID Gerasopoulos, Evangelos (Avtor)
ID Pilinis, Christodoulos (Avtor), et al.
Datoteke:.pdf aaqr-17-11-ac3-0544.pdf (1,36 MB)
MD5: 8A63A7DAC87EDBBF059E9BEEE013DABE
 
URL http://www.aaqr.org/article/download?articleId=1475&path=/files/article/6790/6_AAQR-17-11-AC3-0544_49-70.pdf
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:One-year measurements (October 2016–September 2017) of aerosol optical properties in the Athens urban environment were analyzed; for closure purposes, the results were supported by data of chemical composition of the non-refractory submicron aerosol fraction acquired with an Aerosol Chemical Speciation Monitor (ACSM). Both the spectral scattering (bsca) and absorption (babs) coefficients exhibit a pronounced annual variability with higher values (63.6 Mm–1 at 550 nm and 41.0 Mm–1 at 520 nm, respectively) in winter, due to domestic heating releasing increased carbonaceous emissions and the shallow mixing layer trapping aerosols near the surface. Much lower values (33.5 Mm–1 and 22.9 Mm–1 for bsca and babs, respectively) are found during summer, indicating rather aged aerosols from regional sources. The estimations of the dry spectral single scattering albedo (SSA), scattering (SAE) and absorption (AAE) Ångström exponents focus on the seasonality of the urban aerosols. The high SAE (~2.0) and low SSA (0.62 ± 0.11) values throughout the year indicate the dominance of fine-absorbing aerosols from fossil-fuel combustion, while the high AAE (~1.5) in winter suggests enhanced presence of biomass-burning aerosols. Pronounced morning and late evening/night peaks are found in both bsca and babs during winter, coinciding with the morning traffic rush hour and increased residential wood burning in the evening, while in the other seasons, the diurnal patterns flatten out. The wind speed strongly affects the aerosol loading and properties in winter, since for winds below 3 m s–1, a high increase in bsca and babs is observed, consistent with low dilution processes and hazy/smoggy conditions. Our closure experiments indicate a good agreement (R2 = 0.91, slope = 1.08) between the reconstructed and measured bsca values and reveal that organic matter contributes about half of the sub-micron mass in winter, followed by sulfate (~40%) and nitrate (10%, only in winter) aerosols.
Ključne besede:urban aerosols, light scattering, absorption, chemical species, wood burning, Athens
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:01.01.2019
Leto izida:2019
Št. strani:str. 49-70
Številčenje:Vol. 12, no. 1
PID:20.500.12556/RUNG-9061 Novo okno
ISSN:1680-8584
COBISS.SI-ID:195092739 Novo okno
UDK:502/504
ISSN pri članku:1680-8584
eISSN:2071-1409
DOI:10.4209/aaqr.2017.11.0544 Novo okno
NUK URN:URN:SI:UNG:REP:RD9DDK9Z
Datum objave v RUNG:10.05.2024
Število ogledov:398
Število prenosov:2
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Gradivo je del revije

Naslov:Aerosol and air quality research
Skrajšan naslov:Aerosol air qual. res.
Založnik:Chinese Association for Aerosol Research in Taiwan
ISSN:1680-8584
COBISS.SI-ID:23501607 Novo okno

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Licenca:CC BY-SA 4.0, Creative Commons Priznanje avtorstva-Deljenje pod enakimi pogoji 4.0 Mednarodna
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