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

Palm, Brett B.; Sá, Suzane S. de; Day, Douglas A.; Campuzano‐Jost, Pedro; Hu, Weiwei; Seco, Roger; Sjostedt, Steven J.; Park, Jeong‐Hoo; Guenther, Alex; Kim, Saewung; Brito, Joel; Wurm, Florian Μ.; Artaxo, Paulo; Thalman, Ryan; Wang, Jian; Yee, L. D.; Wernis, Rebecca A.; Isaacman-VanWertz, Gabriel; Goldstein, Allen H.; Liu, Yingjun; Springston, Stephen; Souza, Rodrigo Augusto Ferreira de; Newburn, Matt K.; Alexander, M. Lizabeth; Martin, Scot T.; Jimenez, José L.

doi:10.5194/acp-18-467-2018

Cited by 75 publications

(101 citation statements)

References 143 publications

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“…In this work, SO 2 loadings were 5-28 times higher than D 5 . We recognize that for the best estimate of OH exposure, similar concentrations are desired due to the potential for OH suppression in the chamber Peng et al, 2015Peng et al, , 2016. The aerosol yield was calculated from the SMPS particle loss-corrected mass concentration and the reacted D 5 gas measurements (aerosol mass/reacted D 5 gas concentration).…”

Section: Yieldmentioning

confidence: 99%

Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane

et al. 2019

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Cyclic volatile methyl siloxanes (cVMS) are highproduction chemicals present in many personal care products. They are volatile, hydrophobic, and relatively longlived due to slow oxidation kinetics. Evidence from chamber and ambient studies indicates that oxidation products may be found in the condensed aerosol phase. In this work, we use an oxidation flow reactor to produce ∼ 100 µg m −3 of organosilicon aerosol from OH oxidation of decamethylcyclopentasiloxane (D 5 ) with aerosol mass fractions (i.e., yields) of 0.2-0.5. The aerosols were assessed for concentration, size distribution, morphology, sensitivity to seed aerosol, hygroscopicity, volatility and chemical composition through a combination of aerosol size distribution measurement, tandem differential mobility analysis, and electron microscopy. Similar aerosols were produced when vapor from solid antiperspirant was used as the reaction precursor. Aerosol yield was sensitive to chamber OH and to seed aerosol, suggesting sensitivity of lower-volatility species and recovered yields to oxidation conditions and chamber operation. The D 5 oxidation aerosol products were relatively non-hygroscopic, with an average hygroscopicity kappa of ∼ 0.01, and nearly non-volatile up to 190 • C temperature. Parameters for exploratory treatment as a semi-volatile organic aerosol in atmospheric models are provided.Published by Copernicus Publications on behalf of the European Geosciences Union.

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Section: Yieldmentioning

confidence: 99%

Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane

et al. 2019

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“…Journal of Geophysical Research: Atmospheres if any, but not altered in the Go:PAM reactor (Palm et al, 2018). The secondary factors were left unconstrained.…”

Section: /2018jd029904mentioning

confidence: 99%

Characterization of Aerosol Aging Potentials at Suburban Sites in Northern and Southern China Utilizing a Potential Aerosol Mass (Go:PAM) Reactor and an Aerosol Mass Spectrometer

Liu

et al. 2019

JGR Atmospheres

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Aerosol mass spectrometry was used to characterize submicron aerosols before and after aging in a Gothenburg Potential Aerosol Mass (Go:PAM) reactor at two suburban sites in China, one in northern China at Changping (CP), Beijing, and a second in southern China at Hong Kong (HK). Organic aerosol (OA) dominated in the ambient nonrefractory particulate matter <1 μm (NR‐PM1) for both CP (42–71%) and HK (43–61%), with a large contribution from secondary OA factors that were semivolatile oxygenated (SVOOA) and low‐volatility oxygenated (LVOOA). Under constant OH exposure, OA enhancement (78–98%) dominated the NR‐PM1 mass increment at both sites, while nitrate was enhanced the most among the inorganic species (7–9%). Overall, the CP site exhibited higher OA oxidation potential and more enhancement of SVOOA than LVOOA (7.5 vs. 2.7 μg/m3), but the reverse was observed in HK (0.8 vs. 2.6 μg/m3). In CP, more enhancement of the less oxygenated SVOOA suggests that aerosol aging was more sensitive to the abundant locally emitted primary OA and volatile organic compound precursors. On the contrary, the more formation of the highly oxidized LVOOA in HK indicates that aerosol aging mainly escalated the degree of oxygenation of OA as ambient aerosol was already quite aged and there was a lack of volatile organic compound precursors. The comparative measurements using the same oxidation system reveal distinct key factors and mechanisms that influence secondary aerosol formation in two suburban locations in China, providing scientific insights to assist formulation of location‐specific mitigation measures of secondary pollution.

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“…Ambient measurements for this study were obtained every other 4 min. The other 4 min was used for an analysis of the output from an oxidation flow reactor as presented in Palm et al (2018).…”

Section: Aerosol Mass Spectrometrymentioning

confidence: 99%

“…Overall, this factor was interpreted as representing highly oxidized PM from multiple processes. Species initially associated with HOA, BBOA, ADOA, IEPOX-SOA, and LO-OOA factors may converge after sufficient atmospheric oxidation to become represented by the MO-OOA factor Palm et al, 2018).…”

Section: Characterization Of Organic Pm By Positive-matrix Factorizationmentioning

confidence: 99%

Urban influence on the concentration and composition of submicron particulate matter in central Amazonia

Palm

Campuzano‐Jost

et al. 2018

Atmos. Chem. Phys.

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Abstract. An understanding of how anthropogenic emissions affect the concentrations and composition of airborne particulate matter (PM) is fundamental to quantifying the influence of human activities on climate and air quality. The central Amazon Basin, especially around the city of Manaus, Brazil, has experienced rapid changes in the past decades due to ongoing urbanization. Herein, changes in the concentration and composition of submicron PM due to pollution downwind of the Manaus metropolitan region are reported as part of the GoAmazon2014/5 experiment.A high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) and a suite of other gas-and particle-phase instruments were deployed at the "T3" research site, 70 km downwind of Manaus, during the wet season. At this site, organic components represented 79±7 % of the non-refractory PM 1 mass concentration on average, which was in the same range as several upwind sites. However, the organic PM 1 was considerably more oxidized at T3 compared to upwind measurements. Positive-matrix factorization (PMF) was applied to the time series of organic mass spectra collected at the Published by Copernicus Publications on behalf of the European Geosciences Union. S. S. de Sá et al.: Urban influence on submicron PM in central AmazoniaT3 site, yielding three factors representing secondary processes (73 ± 15 % of total organic mass concentration) and three factors representing primary anthropogenic emissions (27 ± 15 %). Fuzzy c-means clustering (FCM) was applied to the afternoon time series of concentrations of NO y , ozone, total particle number, black carbon, and sulfate. Four clusters were identified and characterized by distinct air mass origins and particle compositions. Two clusters, Bkgd-1 and Bkgd-2, were associated with background conditions. Bkgd-1 appeared to represent near-field atmospheric PM production and oxidation of a day or less. Bkgd-2 appeared to represent material transported and oxidized for two or more days, often with out-of-basin contributions. Two other clusters, Pol-1 and Pol-2, represented the Manaus influence, one apparently associated with the northern region of Manaus and the other with the southern region of the city. A composite of the PMF and FCM analyses provided insights into the anthropogenic effects on PM concentration and composition. The increase in mass concentration of submicron PM ranged from 25 % to 200 % under polluted compared with background conditions, including contributions from both primary and secondary PM. Furthermore, a comparison of PMF factor loadings for different clusters suggested a shift in the pathways of PM production under polluted conditions. Nitrogen oxides may have played a critical role in these shifts. Increased concentrations of nitrogen oxides can shift pathways of PM production from HO 2 -dominant to NO-dominant as well as increase the concentrations of oxidants in the atmosphere. Consequently, the oxidation of biogenic and anthropogenic precursor gases as well as the oxidative processing of preexi...

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

Cited by 75 publications

References 143 publications

Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane

Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane

Characterization of Aerosol Aging Potentials at Suburban Sites in Northern and Southern China Utilizing a Potential Aerosol Mass (Go:PAM) Reactor and an Aerosol Mass Spectrometer

Urban influence on the concentration and composition of submicron particulate matter in central Amazonia

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