| Title: | Long-term brown carbon spectral characteristics in a Mediterranean city (Athens) |
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| Authors: | ID Liakakou, Eleni (Author)
ID Kaskaoutis, Dimitris G. (Author)
ID Grivas, Georgios (Author)
ID Stavroulas, Iasonas (Author)
ID Tsagkaraki, M. (Author)
ID Paraskevopoulou, D. (Author)
ID Bougiatioti, Aikaterini (Author)
ID Dumka, Umesh Chandra (Author)
ID Gerasopoulos, Evangelos (Author)
ID Mihalopoulos, Nikolaos (Author) |
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| Files: |  https://www.sciencedirect.com/science/article/pii/S0048969719350119?via%3Dihub
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | This study analyses 4-years of continuous 7-λ Aethalometer (AE-33) measurements in an urban-background environment of Athens, to resolve the spectral absorption coefficients (babs) for black carbon (BC) and brown carbon (BrC). An important BrC contribution (23.7 ± 11.6%) to the total babs at 370 nm is estimated for the period May 2015–April 2019, characterized by a remarkable seasonality with winter maximum (33.5 ± 13.6%) and summer minimum (18.5 ± 8.1%), while at longer wavelengths the BrC contribution is significantly reduced (6.8 ± 3.6% at 660 nm). The wavelength dependence of the total babs gives an annual-mean AAE370-880 of 1.31, with higher values in winter night-time. The BrC absorption and its contribution to babs presents a large increase reaching up to 39.1 ± 13.6% during winter nights (370 nm), suggesting residential wood burning (RWB) emissions as a dominant source for BrC. This is supported by strong correlations of the BrC absorption with OC, EC, the fragment ion m/z 60 derived from ACSM and PMF-analyzed organic fractions related to biomass burning (e.g. BBOA). In contrast, BrC absorption decreases significantly during daytime as well as in the warm period, reaching to a minimum during the early-afternoon hours in all seasons due to photo-chemical degradation. Estimated secondary BrC absorption is practically evident only during winter night-time, implying the fast oxidation of BrC species from RWB emissions. Changes in mixing-layer height do not significantly affect the BrC absorption in winter, while they play a major role in summer. |
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| Keywords: | spectral aerosol absorption, brown carbon, wood burning, organic aerosols, chemical composition, Athens |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.03.2020 |
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| Year of publishing: | 2020 |
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| Number of pages: | str. 1-14 |
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| Numbering: | Vol. 708, [article no.] 135019 |
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| PID: | 20.500.12556/RUNG-9052  |
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| COBISS.SI-ID: | 195079171 |
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| ISSN: | 0048-9697 |
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| UDC: | 53 |
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| ISSN on article: | 1879-1026 |
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| DOI: | 10.1016/j.scitotenv.2019.135019 |
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| NUK URN: | URN:SI:UNG:REP:4TJXEMYL |
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| Publication date in RUNG: | 10.05.2024 |
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| Views: | 152 |
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| Downloads: | 1 |
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