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Identifier 000428681
Title VOC source apportionment and emission inventory evaluation over the great Athens, comparison with other cities of the Mediterranean basin
Alternative Title Προσδιορισμός πηγών πτητικών οργανικών ενώσεων και αξιολόγηση βάσεων δεδομένων εκπομπών στην ευρύτερη περιοχή των Αθηνών, σύγκριση με άλλες πόλεις της Μεσογείου
Author Πανοπούλου, Αναστασία Π
Thesis advisor Μιχαλόπουλος, Νικόλαος
Locoge, Nadine
Reviewer Κανακίδου, Μαρία
Λιακάκου, Ελένη
Περγαντής, Σπυρίδων
Afif, Charbel
Gros, Valerie
Sauvage, Stephane
Abstract VOC (Volatile Organic Compounds) are key constituents of atmospheric chemistry and pollution as precursors of harmful compounds like ground ozone and secondary organic aerosols, which in turn have a strong impact on local/regional air quality, climate, vegetation and human health. For that reason and in order to design and implement efficient air pollution control measures, there is a growing interest for their better characterization, as well as the identification, speciation and quantification of their respective sources. Mediterranean basin is a complex environment, favoring the development of severe air pollution events. Despite that, there is a lack of VOC studies in the urban areas of the region, while the existing ones have shown significant uncertainties associated with compounds speciation and the contribution from the different emission sources. Considering this, Athens (Greece) is the ideal place for VOC measurements due to the lack of reported levels for NMHCs the last 15 years, the continuous exceedance of O3 and aerosol concentrations and the increasing emissions from specific pollutant sources (e.g. wood burning for residential heating). In this work, we report the results of an 17-month field campaign for NMHCs in Athens (October 2015 – February 2017), under the frame of the international project ChArMEX (The Chemistry – Aerosol Mediterranean Experiment). This was supported by two one-month intensive observation periods (winter and summer) at the same station, and two additional near-source campaigns (tunnel and traffic station). More than 40 VOC with 2 to 16 carbon atoms have been measured giving for the first time a detailed characterization of their temporal and spatial variability on an annual basis, especially for C2 – C3 NMHCs, followed by the determination of its driving parameters. The comparison with other VOC studies in cities worldwide highlighted the role of sources to the observed levels, with significant air pollution for Athens in winter. Furthermore, the analysis indicated that monoterpenes and isoprene, known compounds of biogenic origin, presented a complex variability probably influenced by emissions other than biogenic. The latter provides interesting insights for the assessment of their impact on air quality, as precursors of secondary pollutants. Moreover, the application of the receptor-oriented model Positive Matrix Factorization (PMF) allowed the identification of the main factors related to VOC sources and the quantification of their contribution. Traffic-related emissions and residential heating were determined as the major VOC sources in the city, whereas a second PMF simulation to the intensive observation period gave additional information about sources such as the fuel evaporation from stationary points.
Language English
Subject Athens
ChArMEx project
Mediterranean basin
PMF model
Αtmospheric pollution
Ατμοσφαιρική ρύπανση
Issue date 2020-03-16
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Chemistry--Doctoral theses
  Type of Work--Doctoral theses
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