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Comparison of Summer and Winter Highly Time-Resolved Submicron Aerosol Composition Measured at a Suburban Site in Prague
Kubelová, Lucie
We analyzed c-ToF-AMS data from a summer (20. 6.–31. 7. 2012) and winter (8. 1.–19. 2. 2013) measurement campaign at a suburban site Prague-Suchdol. The observed chemical composition with dominating organics in both seasons was in accordance with previous measurements at this site.The modal diameter of size distribution occurred at higher values during episodes of increased total concentration and decreased temperature. Furthermore, we compared the AMS data with organic carbon elemental carbon field analyzer (OC/EC) measurement. This comparison together with analysis of particular organic fragments revealed that winter aerosol was less oxidized and more influenced by biomass burning. Such characteristics point to an influence of local domestic heating in winter.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22015061709390 - PDF
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Aerosol Chemical Composition Studied by the Aerosol Mass Spectrometry – Identification of Aerosol Emerging during New Year´s Celebration
Kubelová, Lucie ; Vodička, Petr ; Schwarz, Jaroslav ; Ždímal, Vladimír
This study focused on finding of a marker of presence of aerosol originating during fireworks using aerosol mass spectrometer c-ToF-AMS. During the 48-hour campaign, we observed 4 episodes characterized by increased mass concentration of aerosol. Nonetheless, the main focus was placed on the episode right after the New Year's celebration.The AMS spectrometer enabled to identify fragments originating from fireworks. We found that presence of fireworks aerosol particles leads to a significant increase of the ratio m/z 39 and total organic mass. Since the increase in the fragment m/z 39 is usually connected with an increase in organic matter (i.e. with their relatively small mutual ratio), it is possible to consider the increased value of such ratio as a marker of presence of aerosol pariticles originating from firewords.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22015022514110 - PDF
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Search for Links between Organic Aerosols Measured by Aerosol Mass Spectrometer and EC/OC Analyzer
Vodička, Petr ; Kubelová, Lucie ; Makeš, Otakar ; Schwarz, Jaroslav
Carbonaceous aerosols form a major part of particulate matter suspended in the atmosphere. The organic part of aerosol represents a diverse group of substances that can be analyzed in different ways. In this work, the possible linkages between organic fractions measured by Compact Time-of-Flight Aerosol Mass Spectrometer (AMS; from Aerodyne) and a semi-online EC/OC analyzer (from Sunset Laboratories) were search. Each of these instruments provides a different kind of information. Organic fractions from EC/OC analyzer provide knowledges about a diferent volatility of organic carbon (OC) while AMS provide informations about a chemical composition of characteristic mass fragments. Thus, the main objective of this work was to determine whether the organic fractions from EC/OC analyzer can indirectly provide also information on the chemical composition or somehow more characterize type of aerosol.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22014102013551 - PDF
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Changes in Composition of Submicron Particular Matter of Atmospheric Aerosol During 2013 New Year´s Celebration
Kubelová, Lucie ; Vodička, Petr ; Schwarz, Jaroslav
In this work we investigated rapid changes in chemical composition of PM1 fraction during the celebrations of New Year 2013. The measurements were carried out at the urban background site Prague-Suchdol. The compact Time-of-Flight Aerosol Mass Spectrometer (c-ToF-AMS, Aerodyne), Drewnick et al. (2005), was used to analyze highly time-resolved samples of non-refractory aerosol components. We focused on four episodes with significantly elevated total aerosol mass concentration. We assume that the increased concentrations are due to: smoke plume from wood burning in Episode 1, fireworks in Episode 2, arrival of another air mass in Episode 3, and an uncategorized source of poly-aromatic hydrocarbons in Episode 4. The highest attention was given to the time interval between 00:20 and 2:20 a.m. on the New Year (marked in Figure 1 as Episode 2) as the aerosol composition was significantly affected by the occurring annual celebrations. In this period, the most significant increase in mass concentration was observed by sulfate, chlorides, and potassium (involved in the mass spectra for fragment 39). At the same time, nitrate and ammonium were unaffected. Those trends were compared to other measurements with c-ToF-AMS during annual celebrations, Drewnick et al.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22013101814584 - PDF
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