Molecular composition of organic aerosols in central Amazonia: an ultra-high-resolution mass spectrometry study

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dc.contributor.authorKourtchev, Ivan
dc.contributor.authorGodoi, Ricardo H. M.
dc.contributor.authorConnors, Sarah
dc.contributor.authorLevine, James G.
dc.contributor.authorArchibald, Alex T.
dc.contributor.authorGodoi, Ana F. L.
dc.contributor.authorParalovo, Sarah L.
dc.contributor.authorBarbosa, Cybelli G. G.
dc.contributor.authorSouza, Rodrigo A. F.
dc.contributor.authorManzi, Antonio O.
dc.contributor.authorSeco, Roger
dc.contributor.authorSjostedt, Steve
dc.contributor.authorPark, Jeong-Hoo
dc.contributor.authorGuenther, Alex
dc.contributor.authorKim, Saewung
dc.contributor.authorSmith, James
dc.contributor.authorMartin, Scot T.
dc.contributor.authorKalberer, Markus
dc.contributor.funderEuropean Research Councilen
dc.contributor.funderU.S. Department of Energyen
dc.contributor.funderConselho Nacional de Desenvolvimento Científico e Tecnológicoen
dc.date.accessioned2016-10-21T12:00:19Z
dc.date.available2016-10-21T12:00:19Z
dc.date.issued2016-09-23
dc.description.abstractThe Amazon Basin plays key role in atmospheric chemistry, biodiversity and climate change. In this study we applied nanoelectrospray (nanoESI) ultra-high-resolution mass spectrometry (UHRMS) for the analysis of the organic fraction of PM2.5 aerosol samples collected during dry and wet seasons at a site in central Amazonia receiving background air masses, biomass burning and urban pollution. Comprehensive mass spectral data evaluation methods (e.g. Kendrick mass defect, Van Krevelen diagrams, carbon oxidation state and aromaticity equivalent) were used to identify compound classes and mass distributions of the detected species. Nitrogen- and/or sulfur-containing organic species contributed up to 60 % of the total identified number of formulae. A large number of molecular formulae in organic aerosol (OA) were attributed to later-generation nitrogen- and sulfur-containing oxidation products, suggesting that OA composition is affected by biomass burning and other, potentially anthropogenic, sources. Isoprene-derived organosulfate (IEPOX-OS) was found to be the most dominant ion in most of the analysed samples and strongly followed the concentration trends of the gas-phase anthropogenic tracers confirming its mixed anthropogenic–biogenic origin. The presence of oxidised aromatic and nitro-aromatic compounds in the samples suggested a strong influence from biomass burning especially during the dry period. Aerosol samples from the dry period and under enhanced biomass burning conditions contained a large number of molecules with high carbon oxidation state and an increased number of aromatic compounds compared to that from the wet period. The results of this work demonstrate that the studied site is influenced not only by biogenic emissions from the forest but also by biomass burning and potentially other anthropogenic emissions from the neighbouring urban environments.en
dc.description.sponsorshipU.S. Department of Energy (Grant DE-SC0011122); Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil (Grant 001030/2012-4)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationKourtchev, I., Godoi, R. H. M., Connors, S., Levine, J. G., Archibald, A. T., Godoi, A. F. L., Paralovo, S. L., Barbosa, C. G. G., Souza, R. A. F., Manzi, A. O., Seco, R., Sjostedt, S., Park, J.-H., Guenther, A., Kim, S., Smith, J., Martin, S. T., and Kalberer, M. (2016) 'Molecular composition of organic aerosols in central Amazonia: an ultra-high-resolution mass spectrometry study', Atmospheric Chemistry and Physics, 16, pp. 11899-11913. doi:10.5194/acp-16-11899-2016en
dc.identifier.doi10.5194/acp-16-11899-2016
dc.identifier.endpage11913en
dc.identifier.issn1680-7316
dc.identifier.issued16en
dc.identifier.journaltitleAtmospheric Chemistry and Physicsen
dc.identifier.startpage11899en
dc.identifier.urihttps://hdl.handle.net/10468/3208
dc.language.isoenen
dc.publisherEuropean Geosciences Unionen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP2::ERC/279405/EU/Composition and Sources of Atmospheric Organic Aerosol and their Negative Health Effects/CORANEen
dc.rights© 2016, the Authors. Open Access. This article is distributed under the terms of the Creative Commons Attribution 3.0 Unported License (CC-BY 3.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/en
dc.subjectAmazon Basinen
dc.subjectNanoelectrosprayen
dc.subjectNanoESIen
dc.subjectUltra-high-resolution mass spectrometryen
dc.subjectUHRMSen
dc.subjectIsoprene-derived organosulfateen
dc.subjectIEPOX-OSen
dc.titleMolecular composition of organic aerosols in central Amazonia: an ultra-high-resolution mass spectrometry studyen
dc.typeArticle (peer-reviewed)en
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