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Naslov:Molecular characterization of free tropospheric aerosol collected at the Pico Mountain Observatory : a case study with a long-range transported biomass burning plume
Avtorji:ID Džepina, Katja (Avtor)
ID Mazzoleni, Claudio (Avtor)
ID Fialho, Paulo (Avtor)
ID China, Swarup (Avtor)
ID Zhang, Bo (Avtor)
ID Owen, R. Chris (Avtor)
ID Helmig, D. (Avtor)
ID Hueber, J. (Avtor)
ID Kumar, Sumit (Avtor)
ID Perlinger, J. A. (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Free tropospheric aerosol was sampled at the Pico Mountain Observatory located at 2225 m above mean sea level on Pico Island of the Azores archipelago in the North Atlantic. The observatory is located ∼ 3900 km east and downwind of North America, which enables studies of free tropospheric air transported over long distances. Aerosol samples collected on filters from June to October 2012 were analyzed to characterize organic carbon, elemental carbon, and inorganic ions. The average ambient concentration of aerosol was 0.9 ± 0.7 µg m−3 . On average, organic aerosol components represent the largest mass fraction of the total measured aerosol (60 ± 51 %), followed by sulfate (23 ± 28 %), nitrate (13 ± 10 %), chloride (2 ± 3 %), and elemental carbon (2 ± 2 %). Water-soluble organic matter (WSOM) extracted from two aerosol samples (9/24 and 9/25) collected consecutively during a pollution event were analyzed using ultrahigh-resolution electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Approximately 4000 molecular formulas were assigned to each of the mass spectra in the range of m/z 100–1000. The majority of the assigned molecular formulas had unsaturated structures with CHO and CHNO elemental compositions. FLEXPART retroplume analyses showed the sampled air masses were very aged (average plume age > 12 days). These aged aerosol WSOM compounds had an average O /C ratio of ∼ 0.45, which is relatively low compared to O /C ratios of other aged aerosol. The increase in aerosol loading during the measurement period of 9/24 was linked to biomass burning emissions from North America by FLEXPART retroplume analysis and Moderate Resolution Imaging Spectroradiometer (MODIS) fire counts. This was confirmed with biomass burning markers detected in the WSOM and with the morphology and mixing state of particles as determined by scanning electron microscopy. The presence of markers characteristic of aqueous-phase reactions of phenolic species suggests that the aerosol collected at the Pico Mountain Observatory had undergone cloud processing before reaching the site. Finally, the air masses of 9/25 were more aged and influenced by marine emissions, as indicated by the presence of organosulfates and other species characteristic of marine aerosol. The change in the air masses for the two samples was corroborated by the changes in ethane, propane, and ozone, morphology of particles, as well as by the FLEXPART retroplume simulations. This paper presents the first detailed molecular characterization of free tropospheric aged aerosol intercepted at a lower free troposphere remote location and provides evidence of low oxygenation after long-range transport. We hypothesize this is a result of the selective removal of highly aged and polar species during long-range transport, because the aerosol underwent a combination of atmospheric processes during transport facilitating aqueous-phase removal (e.g., clouds processing) and fragmentation (e.g., photolysis) of components.
Ključne besede:organic aerosol, ultrahigh-resolution FT-ICR MS, electron microscopy, remote marine atmosphere, Pico Mountain Observatory
Leto izida:2015
Št. strani:str. 5047-5068
Številčenje:Vol. 15, iss. 9
PID:20.500.12556/RUNG-6451 Novo okno
COBISS.SI-ID:59042563 Novo okno
UDK:54
ISSN pri članku:1680-7316
DOI:10.5194/acp-15-5047-2015 Novo okno
NUK URN:URN:SI:UNG:REP:FDGQV8QA
Datum objave v RUNG:11.04.2021
Število ogledov:3669
Število prenosov:0
Metapodatki:XML DC-XML DC-RDF
:
DŽEPINA, Katja, MAZZOLENI, Claudio, FIALHO, Paulo, CHINA, Swarup, ZHANG, Bo, OWEN, R. Chris, HELMIG, D., HUEBER, J., KUMAR, Sumit in PERLINGER, J. A., 2015, Molecular characterization of free tropospheric aerosol collected at the Pico Mountain Observatory : a case study with a long-range transported biomass burning plume. Atmospheric chemistry and physics [na spletu]. 2015. Vol. 15, no. 9, p. 5047–5068. [Dostopano 8 april 2025]. DOI 10.5194/acp-15-5047-2015. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=6451
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Gradivo je del revije

Naslov:Atmospheric chemistry and physics
Skrajšan naslov:Atmos. chem. phys.
Založnik:European Geophysical Society, Copernicus GmbH
ISSN:1680-7316
COBISS.SI-ID:23215911 Novo okno

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