Chemical composition and photochemical formation of hydroxyl radicals in aqueous extracts of aerosol particles collected in Okinawa, Japan

Arakaki, Takemitsu; Kuroki, Y.; Okada, Kouichirou; Nakama, Y.; Ikota, Hirotsugu; Kinjo, M.; Higuchi, Tomihiko; Uehara, M.; Tanahara, Akira

doi:10.1016/j.atmosenv.2006.04.035

Cited by 53 publications

(54 citation statements)

References 38 publications

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“…The processing of organic compounds in atmospheric waters can be initiated by numerous oxidizing radicals, including OH, NO 3 , HO 2 , and also radical anions such as O , and finally, non-radical reactants such as ozone and H 2 O 2 . The OH radical is one of the major sinks for organic compounds, and its presence in atmospheric waters has been confirmed in numerous studies (e.g., Faust and Allen, 1993;Arakaki and Faust, 1998;Anastasio and McGregor, 2001;Arakaki et al, 2006). The major sources for aqueous phase OH radicals are highly dependent on the surrounding air masses (Herrmann et al, 2000;Deguillaume et al, 2004).…”

Section: Aqueous Phase Oxidation Of Organic Compoundsmentioning

confidence: 98%

“…Experimental and theoretical studies confirm that dissolved organic compounds play a major role in the cycling of OH radicals to HO 2 /O − 2 radicals and/or H 2 O 2 (Lelieveld and Crutzen, 1990;Arakaki and Faust, 1998;Monod and Carlier, 1999;Blando and Turpin, 2000;Herrmann et al, 2000Herrmann et al, , 2005Anastasio and McGregor, 2001;Herrmann, 2003;Deguillaume et al, 2004;Ervens et al, 2003aErvens et al, , 2004aArakaki et al, 2006;and references therein).…”

Section: Aqueous Phase Oxidation Of Organic Compoundsmentioning

confidence: 98%

“…However, for clouds in the free troposphere this formation pathway is of minor importance compared to the aqueous phase photolysis of nitrate ions (Arakaki et al, 2006) …”

Section: Aqueous Phase Oxidation Of Organic Compoundsmentioning

confidence: 99%

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The formation, properties and impact of secondary organic aerosol: current and emerging issues

et al. 2009

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Abstract. Secondary organic aerosol (SOA) accounts for a significant fraction of ambient tropospheric aerosol and a detailed knowledge of the formation, properties and transformation of SOA is therefore required to evaluate its impact on atmospheric processes, climate and human health. The chemical and physical processes associated with SOA formation are complex and varied, and, despite considerable progress in recent years, a quantitative and predictive understanding of SOA formation does not exist and therefore represents a major research challenge in atmospheric science. This review begins with an update on the current state of knowledge on the global SOA budget and is followed by an overview of the atmospheric degradation mechanisms for SOA precursors, gas-particle partitioning theory and the analytical techniques used to determine the chemical composition of SOA. A survey of recent laboratory, field and modeling studies is also presented. The following topical and emerging issues are highlighted and discussed in detail: molecular characterization of biogenic SOA constituents, condensed phase reactions and oligomerization, the interaction of atmospheric organic components with sulfuric acid, the chemical and photochemical processing of organics in the atmospheric aqueous phase, aerosol formation from real plant emissions, interaction of atmospheric organic components with water, thermodynamics and mixtures in atmospheric models. Finally, the major challenges ahead in laboratory, field and modeling studies of SOA are discussed and recommendations for future research directions are proposed.

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Section: Aqueous Phase Oxidation Of Organic Compoundsmentioning

confidence: 98%

Section: Aqueous Phase Oxidation Of Organic Compoundsmentioning

confidence: 98%

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The formation, properties and impact of secondary organic aerosol: current and emerging issues

et al. 2009

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“…More recently, UV irradiation of particles collected in marine environments has shown that NO 3 À photolysis is a major source of OH radicals in such particles. 55,56 The present studies describe the generation of gaseous NO 2 upon irradiation of deliquesced NaNO 3 compared to mixtures of NaCl and NaNO 3 deposited on a Teflon s substrate. The UV/visible absorption spectra of these mixtures were measured to investigate changes in the NO 3 À absorption in concentrated mixtures of NaCl and NaNO 3 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced surface photochemistry in chloride–nitrate ion mixtures

Wingen

Moskun

Johnson

et al. 2008

Phys. Chem. Chem. Phys.

116

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Heterogeneous reactions of sea salt aerosol with various oxides of nitrogen lead to replacement of chloride ion by nitrate ion. Studies of the photochemistry of a model system were carried out using deliquesced mixtures of NaCl and NaNO 3 on a Teflon s substrate. Varying molar ratios of NaCl to NaNO 3 (1 : 9 Cl À : NO 3 À , 1 : 1 Cl À : NO 3 À , 3 : 1 Cl À : NO 3 À , 9 : 1 Cl À : NO 3 À) and NaNO 3 at the same total concentration were irradiated in air at 299 AE 3 K and at a relative humidity of 75 AE 8% using broadband UVB light (270-380 nm). Gaseous NO 2 production was measured as a function of time using a chemiluminescence NO y detector. Surprisingly, an enhanced yield of NO 2 was observed as the chloride to nitrate ratio increased. Molecular dynamics (MD) simulations show that as the Cl À : NO 3 À ratio increases, the nitrate ions are drawn closer to the interface due to the existence of a double layer of interfacial Cl À and subsurface Na + . This leads to a decreased solvent cage effect when the nitrate ion photodissociates to NO 2 +O À , increasing the effective quantum yield and hence the production of gaseous NO 2 . The implications of enhanced NO 2 and likely OH production as sea salt aerosols become processed in the atmosphere are discussed.

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“…We discuss the seasonal changes of these components and transformations of organic aerosol (OA) during the longrange transport of Asian aerosols. Many studies related to the atmospheric chemistry have been conducted at Cape Hedo (Sato et al, 2009;Wang et al, 2009;Zhang et al, 2003;Jaffe et al, 2005;Verma et al, 2011;Lun et al, 2009;Yamamoto and Kawamura, 2011;Ueda et al, 2011;Arakaki et al, 2006;Handa et al, 2010;Mochida et al, 2010). However, no studies were conducted for a long-term measurement of OC, EC, WSOC, WSTN, WSON and major ions in atmospheric aerosols from Cape Hedo, Okinawa Island.…”

Section: Introductionmentioning

confidence: 99%

One-year observations of carbonaceous and nitrogenous components and major ions in the aerosols from subtropical Okinawa Island, an outflow region of Asian dusts

Kunwar

Kawamura

2014

Atmos. Chem. Phys.

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Abstract. Ambient aerosol samples (TSP, n = 50) were collected for 12 months at subtropical Okinawa Island, Japan, an outflow region of Asian dusts in the western North Pacific and analysed for organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC), water-soluble total nitrogen (WSTN), water-soluble organic nitrogen (WSON) and major ions to better understand the formation and transformation of East Asian aerosols during long-range atmospheric transport. Concentration ranges of these components are; OC: 0.76-7.1 µg m −3 (av. and Ca 2+ play major role in the neutralization of acidic aerosols forming NH 4 HSO 4 , (NH 4 ) 2 SO 4 and CaSO 4 .

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Chemical composition and photochemical formation of hydroxyl radicals in aqueous extracts of aerosol particles collected in Okinawa, Japan

Cited by 53 publications

References 38 publications

The formation, properties and impact of secondary organic aerosol: current and emerging issues

The formation, properties and impact of secondary organic aerosol: current and emerging issues

Enhanced surface photochemistry in chloride–nitrate ion mixtures

One-year observations of carbonaceous and nitrogenous components and major ions in the aerosols from subtropical Okinawa Island, an outflow region of Asian dusts

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