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Title Διερεύνηση επιπέδων ανθρακούχων αερολυμάτων στην Αττική με χρήση τεχνικών υψηλής χρονικής ανάλυσης
Author Καλλιοντζή, Ελένη
Thesis advisor Μιχαλόπουλος, Νικόλαος
Reviewer Λιακάκου, Ελένη
Abstract The necessity to study and investigate the levels of atmospheric pollutants is indisputable, mainly due of their effects on human health. In this study, the concentration levels of carbonaceous aerosols namely total carbon (TC), organic carbon (OC) and elemental carbon (EC) were investigated for the region of Attica with the thermo-optical method TC-BC (Black Carbon) using the Total Carbon Analyzer TCA08 in combination with the 7-λ Aethalometer AE33. Almost near real time measurements of total carbon took place at the Thissio urban background station at the central premises of the National Observatory of Athens and the sampling period lasted approximately one and a half years from November 2019 to May 2021. According to the TC-BC method the equivalent fraction of organic carbon of carbonaceous aerosols (defined as OC = TC - EC) was determined using the TC and EC values of the Total Carbon Analyzer and the Aethalometer respectively, given as equivalent BC (eBC) instead of EC. However, the values obtained for BC and OC were subjected to a correction process by comparison with values from filters for EC and the Aerosol Chemical Speciation Monitor (ACSM) for organic matter OM, as black carbon particles are likely to be coated by other compounds. The application of these corrections (BC to EC conversion with a factor of 0.75) resulted to the extraction of the final time series, and allowed the study of the levels of carbonaceous aerosols on various time scales (eg hourly, daily or seasonal). The final aim was to investigate the factors and sources controlling the variation of OM and the results highlight the crucial role of biomass burning.
Language Greek
Issue date 2022-11-24
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Graduate theses
  Type of Work--Graduate theses
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