Effect of Organic Coatings, Humidity and Aerosol Acidity on Multiphase Chemistry of Isoprene Epoxydiols

Riva, Matthieu; Bell, David M.; Hansen, Anders Kragh; Drozd, Greg T.; Zhang, Zhenfa; Gold, Avram; Imre, Dan G.; Surratt, Jason D.; Glasius, Marianne; Zelenyuk, Alla

doi:10.1021/acs.est.5b06050

Cited by 78 publications

(117 citation statements)

References 72 publications

(171 reference statements)

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“…In other words, RH does not change the partition of IEPOX in our experimental conditions. This is consistent with the result of Riva et al (2016) that water has a weaker impact on IEPOX-derived SOA yield.…”

Section: Isoprene-h 2 O 2 and Isoprene-o 3 Systemssupporting

confidence: 92%

Different roles of water in secondary organic aerosol formation from toluene and isoprene

Jia

2018

Atmos. Chem. Phys.

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Abstract. Roles of water in the formation of secondary organic aerosol (SOA) from the irradiations of toluene-NO 2 and isoprene-NO 2 were investigated in a smog chamber. Experimental results show that the yield of SOA from toluene almost doubled as relative humidity increased from 5 to 85 %, whereas the yield of SOA from isoprene under humid conditions decreased by 2.6 times as compared to that under dry conditions. The distinct difference of RH effects on SOA formation from toluene and isoprene is well explained with our experiments and model simulations. The increased SOA from humid toluene-NO 2 irradiations is mainly contributed by O-H-containing products such as polyalcohols formed from aqueous reactions. The major chemical components of SOA in isoprene-NO 2 irradiations are oligomers formed from the gas phase. SOA formation from isoprene-NO 2 irradiations is controlled by stable Criegee intermediates (SCIs) that are greatly influenced by water. As a result, high RH can obstruct the oligomerization reaction of SCIs to form SOA.

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Section: Isoprene-h 2 O 2 and Isoprene-o 3 Systemssupporting

confidence: 92%

Different roles of water in secondary organic aerosol formation from toluene and isoprene

Jia

2018

Atmos. Chem. Phys.

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“…A recent study by Riva et al . [] utilized single‐particle mass spectrometry and directly demonstrated that IEPOX uptake by pure ammonium bisulfate and ammonium sulfate particles is a volume‐controlled process. Volume‐controlled IEPOX uptake by pure sulfate particles results in particles with uniform concentration of IEPOX‐derived SOA across a wide range of sizes, as shown by Riva et al .…”

Section: Biogenic Emissions and Soa Formationmentioning

confidence: 99%

“…Volume‐controlled IEPOX uptake by pure sulfate particles results in particles with uniform concentration of IEPOX‐derived SOA across a wide range of sizes, as shown by Riva et al . []. One challenge to incorporating IEPOX reactive uptake into models is that the presence of organic coatings may also affect the kinetics.…”

Section: Biogenic Emissions and Soa Formationmentioning

confidence: 99%

Recent advances in understanding secondary organic aerosol: Implications for global climate forcing

Shrivastava

Cappa

Fan

et al. 2017

Reviews of Geophysics

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723

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Anthropogenic emissions and land use changes have modified atmospheric aerosol concentrations and size distributions over time. Understanding preindustrial conditions and changes in organic aerosol due to anthropogenic activities is important because these features (1) influence estimates of aerosol radiative forcing and (2) can confound estimates of the historical response of climate to increases in greenhouse gases. Secondary organic aerosol (SOA), formed in the atmosphere by oxidation of organic gases, represents a major fraction of global submicron‐sized atmospheric organic aerosol. Over the past decade, significant advances in understanding SOA properties and formation mechanisms have occurred through measurements, yet current climate models typically do not comprehensively include all important processes. This review summarizes some of the important developments during the past decade in understanding SOA formation. We highlight the importance of some processes that influence the growth of SOA particles to sizes relevant for clouds and radiative forcing, including formation of extremely low volatility organics in the gas phase, acid‐catalyzed multiphase chemistry of isoprene epoxydiols, particle‐phase oligomerization, and physical properties such as volatility and viscosity. Several SOA processes highlighted in this review are complex and interdependent and have nonlinear effects on the properties, formation, and evolution of SOA. Current global models neglect this complexity and nonlinearity and thus are less likely to accurately predict the climate forcing of SOA and project future climate sensitivity to greenhouse gases. Efforts are also needed to rank the most influential processes and nonlinear process‐related interactions, so that these processes can be accurately represented in atmospheric chemistry‐climate models.

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“…In addition, hydroxyl radical concentrations can also decrease because of titration by NO 2 (Valin et al, 2013;Rohrer et al, 2014). An increase in total organic mass concentration could possibly contribute to a decrease in IEPOX-derived PM production by kinetically limiting the uptake of IEPOX (Gaston et al, 2014;Lin et al, 2014;Riva et al, 2016a). The dominant effect of the urban plume, however, seems to be that of shifting the fate of ISOPOO radicals through the increase in NO, thereby significantly decreasing the production of ISOPOOH (Liu et al, 2016a) (Sect.…”

Section: No As a Modulator Of Iepox-derived Pm Productionmentioning

confidence: 99%

Influence of urban pollution on the production of organic particulate matter from isoprene epoxydiols in central Amazonia

et al. 2017

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Abstract. The atmospheric chemistry of isoprene contributes to the production of a substantial mass fraction of the particulate matter (PM) over tropical forests. Isoprene epoxydiols (IEPOX) produced in the gas phase by the oxidation of isoprene under HO 2 -dominant conditions are subsequently taken up by particles, thereby leading to production of secondary organic PM. The present study investigates possible perturbations to this pathway by urban pollution. The measurement site in central Amazonia was located 4 to 6 h downwind of Manaus, Brazil. Measurements took place from February through March 2014 of the wet season, as part of the GoAmazon2014/5 experiment. Mass spectra of organic PM collected with an Aerodyne Aerosol Mass Spectrometer were analyzed by positive-matrix factorization. One resolved statistical factor ("IEPOX-SOA factor") was associated with PM production by the IEPOX pathway. The IEPOX-SOA factor loadings correlated with independently measured mass concentrations of tracers of IEPOX-derived PM, namely C 5 -alkene triols and 2-methyltetrols (R = 0.96 and 0.78, respectively). The factor loading, as well as the ratio f of the loading to organic PM mass concentration, decreased under polluted compared to background conditions. For an increase in NO y concentration from 0.5 to 2 ppb, the factor loading and f decreased by two to three fold. Overall, sulfate concentration explained 37 % of the variability in the factor loading. After segregation of factor loading into subsets based on NO y concentration, the sulfate concentration explained up to 75 % of the variability. Considering both factors, the data sets show that the suppressing effects of increased NO concentrations dominated over the enhancing effects of higher sulfate concentrations. The pollution from Manaus elevated NO y concentrations more significantly than sulfate concenPublished by Copernicus Publications on behalf of the European Geosciences Union. 6612 S. S. de Sá et al.: Influence of urban pollution on the production of organic particulate matter trations relative to background conditions. In this light, increased emissions of nitrogen oxides, as anticipated for some scenarios of Amazonian economic development, could significantly alter pathways of PM production that presently prevail over the tropical forest, implying changes to air quality and regional climate.

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Effect of Organic Coatings, Humidity and Aerosol Acidity on Multiphase Chemistry of Isoprene Epoxydiols

Cited by 78 publications

References 72 publications

Different roles of water in secondary organic aerosol formation from toluene and isoprene

Different roles of water in secondary organic aerosol formation from toluene and isoprene

Recent advances in understanding secondary organic aerosol: Implications for global climate forcing

Influence of urban pollution on the production of organic particulate matter from isoprene epoxydiols in central Amazonia

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