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Seasonal changes in stable carbon isotopic composition in the bulk aerosol and gas phases at a suburban site in Prague.
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SYSNO ASEP 0544985 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Seasonal changes in stable carbon isotopic composition in the bulk aerosol and gas phases at a suburban site in Prague. Author(s) Vodička, Petr (UCHP-M) RID, ORCID, SAI
Kawamura, K. (JP)
Schwarz, Jaroslav (UCHP-M) RID, ORCID, SAI
Ždímal, Vladimír (UCHP-M) RID, ORCID, SAIArticle number 149767 Source Title Science of the Total Environment. - : Elsevier - ISSN 0048-9697
Roč. 803, 10 JAN (2022)Number of pages 9 s. Language eng - English Country NL - Netherlands Keywords carbonaceous aerosol ; stable carbon isotope ; gas phase Subject RIV DI - Air Pollution ; Quality OECD category Environmental sciences (social aspects to be 5.7) R&D Projects EF16_013/0001315 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2018122 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UCHP-M - RVO:67985858 UT WOS 000702878600008 EID SCOPUS 85114681001 DOI https://doi.org/10.1016/j.scitotenv.2021.149767 Annotation Isotope fractionation between the gas and aerosol phases is an important phenomenon for studying atmospheric processes. Here, for the first time, seasonally resolved stable carbon isotope ratio (δ13C) values are systematically used to study phase interactions in bulk aerosol and gaseous carbonaceous samples. Seasonal variations in the δ13C of total carbon (TC, δ13CTC) and water-soluble organic carbon (WSOC, δ13CWSOC) in fine aerosol particles (PM2.5) as well as in the total carbon of part of the gas phase (TCgas, δ13CTCgas) were studied at a suburban site in Prague, Czech Republic, Central Europe. Year-round samples were collected for the main and backup filters from 14 April 2016 to 1 May 2017 every 6 days with a 48 h sampling period (n = 66). During all seasons, the highest 13C enrichment was found in WSOC, followed by particulate TC, whereas the highest 13C depletion was found in gaseous TC. We observed a clear seasonal pattern for all δ13C, with the highest values in winter (avg. δ13CTC = -25.5 ± 0.8‰, δ13CWSOC = -25.0 ± 0.7‰, δ13CTCgas = -27.7 ± 0.5‰) and the lowest values in summer (avg. δ13CTC = -27.2 ± 0.5‰, δ13CWSOC = -26.4 ± 0.3‰, δ13CTCgas = -28.9 ± 0.3‰). This study supports the existence of different aerosol sources at the site during the year. Despite the different seasonal compositions of carbonaceous aerosols, the isotope difference (Δδ13C) between δ13CTC (aerosol) and δ13CTCgas (gas phase) was similar during the seasons (year avg. 1.97 ± 0.50‰). Moreover, Δδ13C between WSOC and TC in PM2.5 showed a difference between spring and winter, but in general, these values were also similar year-round (year avg. 0.71 ± 0.37‰). During the entire period, TCgas and WSOC were the most 13C-depleted and most 13C-enriched fractions, respectively, and although the resulting difference Δ(δ13CWSOC − δ13CTCgas) was significant, it was almost invariant throughout the year (2.67 ± 0.44‰). The present study suggests that the stable carbon isotopic fractionation between the bulk aerosol and gas phases is probably not entirely dependent on the chemical composition of individual carbonaceous compounds from different sources.
Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0048969721048427?via%3Dihub
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