Secondary organic aerosol formation from ambient air in an oxidation flow reactor in central Amazonia

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dc.contributor.authorPalm, Brett B.en
dc.contributor.authorde Sa, Suzane S.en
dc.contributor.authorDay, Douglas A.en
dc.contributor.authorCampuzano-Jost, Pedroen
dc.contributor.authorHu, Weiweien
dc.contributor.authorSeco, Rogeren
dc.contributor.authorSjostedt, Steven J.en
dc.contributor.authorPark, Jeong-Hooen
dc.contributor.authorGuenther, Alex B.en
dc.contributor.authorKim, Saewungen
dc.contributor.authorBrito, Joelen
dc.contributor.authorWurm, Florianen
dc.contributor.authorArtaxo, Pauloen
dc.contributor.authorThalman, Ryanen
dc.contributor.authorWang, Jianen
dc.contributor.authorYee, Lindsay D.en
dc.contributor.authorWernis, Rebecca A.en
dc.contributor.authorIsaacman-VanWertz, Gabrielen
dc.contributor.authorGoldstein, Allen H.en
dc.contributor.authorLiu, Yingjunen
dc.contributor.authorSpringston, Stephen R.en
dc.contributor.authorSouza, Rodrigoen
dc.contributor.authorNewburn, Matt K.en
dc.contributor.authorAlexander, M. Lizabethen
dc.contributor.authorMartin, Scot T.en
dc.contributor.authorJimenez, Jose L.en
dc.contributor.departmentCivil and Environmental Engineeringen
dc.date.accessioned2019-11-21T14:35:34Zen
dc.date.available2019-11-21T14:35:34Zen
dc.date.issued2018-01-17en
dc.description.abstractSecondary organic aerosol (SOA) formation from ambient air was studied using an oxidation flow reactor (OFR) coupled to an aerosol mass spectrometer (AMS) during both the wet and dry seasons at the Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5) field campaign. Measurements were made at two sites downwind of the city of Manaus, Brazil. Ambient air was oxidized in the OFR using variable concentrations of either OH or O-3, over ranges from hours to days (O-3) or weeks (OH) of equivalent atmospheric aging. The amount of SOA formed in the OFR ranged from 0 to as much as 10 mu g m(-3), depending on the amount of SOA precursor gases in ambient air. Typically, more SOA was formed during nighttime than daytime, and more from OH than from O-3 oxidation. SOA yields of individual organic precursors under OFR conditions were measured by standard addition into ambient air and were confirmed to be consistent with published environmental chamber-derived SOA yields. Positive matrix factorization of organic aerosol (OA) after OH oxidation showed formation of typical oxidized OA factors and a loss of primary OA factors as OH aging increased. After OH oxidation in the OFR, the hygroscopicity of the OA increased with increasing elemental O : C up to O : C similar to 1.0, and then decreased as O : C increased further. Possible reasons for this decrease are discussed. The measured SOA formation was compared to the amount predicted from the concentrations of measured ambient SOA precursors and their SOA yields. While measured ambient precursors were sufficient to explain the amount of SOA formed from O-3, they could only explain 10-50% of the SOA formed from OH. This is consistent with previous OFR studies, which showed that typically unmeasured semivolatile and intermediate volatility gases (that tend to lack C=C bonds) are present in ambient air and can explain such additional SOA formation. To investigate the sources of the unmeasured SOA-forming gases during this campaign, multilinear regression analysis was performed between measured SOA formation and the concentration of gas-phase tracers representing different precursor sources. The majority of SOA-forming gases present during both seasons were of biogenic origin. Urban sources also contributed substantially in both seasons, while biomass burning sources were more important during the dry season. This study enables a better understanding of SOA formation in environments with diverse emission sources.en
dc.description.notesInstitutional support was provided by the Central Office of the Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA), the National Institute of Amazonian Research (INPA), and Amazonas State University (UEA). We acknowledge support from the Atmospheric Radiation Measurement (ARM) Climate Research Facility, a user facility of the United States Department of Energy (DOE), Office of Science, sponsored by the Office of Biological and Environmental Research, and support from the Atmospheric System Research (ASR) program of that office. Additional funding was provided by the Amazonas State Research Foundation (FAPEAM), the Sao Paulo State Research Foundation (FAPESP), the USA National Science Foundation (NSF), and the Brazilian Scientific Mobility Program (CsF/CAPES). The research was conducted under scientific license 001030/2012-4 of the Brazilian National Council for Scientific and Technological Development (CNPq). This research was supported by the U.S. Department of Energy's (DOE) Atmospheric Science Program (Office of Science, BER, grant nos. DE-SC0016559 and DE-SC0011105), and the DOE SBIR program (DE-SC0011218), as well as NSF AGS-1360834 and EPA STAR 83587701-0. Brett B. Palm is grateful for an EPA STAR graduate fellowship (FP-91761701-0). This manuscript has not been reviewed by EPA and no endorsement should be inferred. A portion of this research was performed using EMSL, a DOE Office of Science User Facility sponsored by the office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. We thank Francesco Canonaco for providing the SoFi software. Gabriel Isaacman-VanWertz was supported by the NSF Graduate Research Fellowship (no. DGE 1106400). SV-TAG data collection was made possible by NSF Atmospheric Chemistry Program 1332998, with instrument development supported by U.S. Department of Energy (DOE) SBIR grant DE-SC0004698. We thank Demetrios Pagonis for assistance in the use of his tubing delay model.en
dc.description.sponsorshipAtmospheric Radiation Measurement (ARM) Climate Research Facility; Amazonas State Research Foundation (FAPEAM); Sao Paulo State Research Foundation (FAPESP)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); USA National Science Foundation (NSF)National Science Foundation (NSF); Brazilian Scientific Mobility Program (CsF/CAPES); Brazilian National Council for Scientific and Technological Development (CNPq)National Council for Scientific and Technological Development (CNPq) [001030/2012-4]; U.S. Department of Energy's (DOE) Atmospheric Science Program (Office of Science, BER) [DE-SC0016559, DE-SC0011105]; DOE SBIR programUnited States Department of Energy (DOE) [DE-SC0011218]; NSFNational Science Foundation (NSF) [AGS-1360834]; EPA STARUnited States Environmental Protection Agency [83587701-0]; EPA STAR graduate fellowshipUnited States Environmental Protection Agency [FP-91761701-0]; office of Biological and Environmental Research; NSF Graduate Research FellowshipNational Science Foundation (NSF) [DGE 1106400]; NSF Atmospheric Chemistry ProgramNational Science Foundation (NSF) [1332998]; U.S. Department of Energy (DOE) SBIR grant [DE-SC0004698]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.5194/acp-18-467-2018en
dc.identifier.eissn1680-7324en
dc.identifier.issn1680-7316en
dc.identifier.issue1en
dc.identifier.urihttp://hdl.handle.net/10919/95827en
dc.identifier.volume18en
dc.language.isoenen
dc.publisherEuropean Geophysical Unionen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleSecondary organic aerosol formation from ambient air in an oxidation flow reactor in central Amazoniaen
dc.title.serialAtmospheric Chemistry and Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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