Matthieu Riva

Comment on egusphere-2025-6310

Farhan R. Nursanto, Quanfu He, Sophia van de Wouw, Annika Zanders et autres

Abstract. Oxidation of volatile organic compounds (VOCs) involving hydroxyl radicals (OH.), nitrogen oxides (NOx), or nitrate radicals (NO3.) forms organic nitrates that undergo gas-particle partitioning, changing the lifetime of nitrogen compounds and their deposition on ecosystems. In urban areas, VOC composition is …

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Substantial Iodide Activation during the Dark Freezing of Aqueous Droplets

Junwei Song, Linyu Gao, Matthieu Riva, D. James Donaldson et autres

Molecular iodine (I 2 ) significantly influences atmospheric oxidation capacity, driving new particle formation and contributing to ozone depletion in polar regions. However, its formation mechanisms in these cold environments, particularly at night, remain poorly understood. Here, we present experimental evidence that …

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Comment on egusphere-2025-6310

Farhan R. Nursanto, Quanfu He, Sophia van de Wouw, Annika Zanders et autres

Abstract. Oxidation of volatile organic compounds (VOCs) involving hydroxyl radicals (OH.), nitrogen oxides (NOx), or nitrate radicals (NO3.) forms organic nitrates that undergo gas-particle partitioning, changing the lifetime of nitrogen compounds and their deposition on ecosystems. In urban areas, VOC composition is …

nl, de, cn, gb, us, fr, ch (code pays fourni par la source)

Light-Absorbing Brown Carbon Aerosol Constituents from Combustion of Indonesian Peat and Biomass

Matthieu Riva, Sri Hapsari Budisulistiorini, Mikinori Kuwata, Michael Williams et autres

Light-absorbing brown carbon (BrC) constituents of organic aerosol (OA) have been shown to significantly absorb ultraviolet (UV) and visible light and thus impact radiative forcing. However, molecular identification of the BrC constituents is still limited. In this study, we characterize BrC constituents …

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Multiphase reactivity of gaseous hydroperoxide oligomers produced from isoprene ozonolysis in the presence of acidified aerosols

Jason D. Surratt, B. J. Turpin, Matthieu Riva, Joel A. Thornton et autres

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

Marianne Glasius, David M. Bell, Dan Imre, Alla Zelenyuk et autres

Multiphase chemistry of isomeric isoprene epoxydiols (IEPOX) has been shown to be the dominant source of isoprene-derived secondary organic aerosol (SOA). Recent studies have reported particles composed of ammonium bisulfate (ABS) mixed with model organics exhibit slower rates of IEPOX uptake. In …

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Natural and Anthropogenically Influenced Isoprene Oxidation in Southeastern United States and Central Amazon

Brett B. Palm, J. L. Jiménez, Marianne Glasius, Pedro Campuzano-Jost et autres

Anthropogenic emissions alter secondary organic aerosol (SOA) formation chemistry from naturally emitted isoprene. We use correlations of tracers and tracer ratios to provide new perspectives on sulfate, NOx, and particle acidity influencing isoprene-derived SOA in two isoprene-rich forested environments representing clean to …

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Nitrogen-Containing, Light-Absorbing Oligomers Produced in Aerosol Particles Exposed to Methylglyoxal, Photolysis, and Cloud Cycling

Mathieu Cazaunau, Aline Gratien, Enrico Tapavicza, Matthieu Riva et autres

Aqueous methylglyoxal chemistry has often been implicated as an important source of oligomers in atmospheric aerosol. Here we report on chemical analysis of brown carbon aerosol particles collected from cloud cycling/photolysis chamber experiments, where gaseous methylglyoxal and methylamine interacted with glycine, ammonium, …

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Ambient Gas-Particle Partitioning of Tracers for Biogenic Oxidation

Karsten Baumann, Antonio Manzi, Paulo Artaxo, J. L. Jiménez et autres

Exchange of atmospheric organic compounds between gas and particle phases is important in the production and chemistry of particle-phase mass but is poorly understood due to a lack of simultaneous measurements in both phases of individual compounds. Measurements of particle- and gas-phase …

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Chemical characterization of organosulfates from the hydroxyl radical-initiated oxidation and ozonolysis of cis-3-hexen-1-ol

Jason D. Surratt, Yuzhi Chen, Glauco F. Bauerfeldt, Avram Gold et autres

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Dominant contribution of oxygenated organic aerosol to haze particles from real-time observation in Singapore during an Indonesian wildfire event in 2015

Sri Hapsari Budisulistiorini, Michael Williams, Mikinori Kuwata, Takuma Miyakawa et autres

Recurring transboundary haze from Indonesian wildfires in previous decades significantly elevated particulate matter (PM) concentrations in Southeast Asia. During that event on 10 to 31 October 2015, we conducted a real-time observation of non-refractory submicron PM (NR-PM1) in Singapore using an Aerodyne …

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Modeling the Size Distribution and Chemical Composition of Secondary Organic Aerosols during the Reactive Uptake of Isoprene-Derived Epoxydiols under Low-Humidity Condition

Yue Zhang, Mega Octaviani, Manish Shrivastava, Marianne Glasius et autres

Reactive uptake of isoprene epoxydiols (IEPOX), which are isoprene oxidation products, onto acidic sulfate aerosols is recognized to be an important mechanism for the formation of isoprene-derived secondary organic aerosol (SOA). While a mechanistic understanding of IEPOX-SOA formation exists, several processes affecting …

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