| Title: | Molekularna karakterizacija lebdećih čestica slobodne troposfere sa Opservatorija Pico planine |
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| Authors: | ID Džepina, Katja (Author)
ID Mazzoleni, Claudio (Author)
ID Fialho, Paulo (Author)
ID China, Swarup (Author)
ID Zhang, B. (Author)
ID Owen, R. Chris (Author)
ID Helmig, D. (Author)
ID Hueber, J. (Author)
ID Kumar, Sumit (Author)
ID Perlinger, J. A. (Author) |
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| Files: |
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| Language: | Slovenian |
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| Work type: | Unknown |
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| Typology: | 1.12 - Published Scientific Conference Contribution Abstract |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Long-range transported free tropospheric aerosol was sampled at the PMO (38°28’15’’N, 28°24’14’’W; 2225 m amsl) on Pico Island of the Azores in the North Atlantic. Filter-collected aerosol during summer 2012 was analysed for organic and elemental carbon, and inorganic ions. The average aerosol ambient concentration was 0.9 µg m-3. Organic aerosol contributed the majority of mass (57%), followed by sulphate (21%) and nitrate (17%). Filter-collected aerosol was positively correlated with on-line aerosol measurements of black carbon, light scattering and number concentration. Water-soluble organic compounds (WSOC) from 9/24 and 9/25 samples collected during a pollution event were analysed with ultrahigh-resolution FT-ICR MS. FLEXPART analysis showed the air masses were very aged (>12 days). ~4000 molecular formulas were assigned to each of the mass spectra between m/z 100-1000. The majority of the assigned molecular formulas have unsaturated structures with CHO and CHNO elemental compositions. WSOC have an average O/C of ~0.45, relatively low compared to O/C of other aged aerosol, which might be the result of evaporation and fragmentation during long-range transport. The increase in aerosol loading during 9/24 was linked to biomass burning emissions from North America by FLEXPART and MODIS fire counts. This was confirmed with WSOC biomass burning markers and with the morphology and mixing state of particles as determined by SEM. The presence of markers characteristic of aqueous-phase reactions of biomass burning phenolic species suggests that the aerosol collected at Pico had undergone cloud processing. The air masses on 9/25 were more aged (~15 days) and influenced by marine emissions, as indicated by organosulphates and species characteristic for marine aerosol (e.g. fatty acids). The change in air masses for the two samples was corroborated by the changes in ozone, ethane, propane, morphology of particles, as well as by FLEXPART. In this presentation we will presents the first detailed molecular characterization of free tropospheric aged aerosol intercepted at the PMO. |
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| Keywords: | Atmospheric aerosol, Free troposphere, Mass spectrometry, Pico mountain observatory |
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| Year of publishing: | 2017 |
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| Number of pages: | Str. 63-64 |
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| PID: | 20.500.12556/RUNG-6556 |
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| COBISS.SI-ID: | 64751107 |
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| UDC: | 54 |
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| NUK URN: | URN:SI:UNG:REP:FIZA3IMH |
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| Publication date in RUNG: | 26.05.2021 |
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| Views: | 3947 |
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| Downloads: | 0 |
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