The levels, sources and reactivity of volatile organic compounds in a typical urban area of Northeast China

Ma, Zhilong; Liu, Chengtang; Zhang, Chenglong; Liu, Peng Fei; Ye, Can; Xue, Chaoyang; Zhao, Di; Sun, Jichen; Du, Yiming; Chai, Fahe; Mu, Yujing

doi:10.1016/j.jes.2018.11.015

Cited by 54 publications

(32 citation statements)

References 49 publications

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“…The main source of radicals was the reaction of O 3 and alkenes throughout the day in winter, while HONO photolysis dominated the source of radicals in the morning and photolysis of carbonyls was dominant at noon in the summer in Tokyo (Kanaya et al, 2007). Previous studies reported that the reaction of OH with NO 2 dominates HO x sinks all day, and the reactions between radicals themselves, e.g., HO 2 + HO 2 and HO 2 + RO 2 , start to be important for the contribution of HO x sinks in the afternoon (Guo et al, 2013;Ling et al, 2014;Mao et al, 2010). Overall, atmospheric oxidation capacity, OH reactivity and HO x budget are three crucial aspects for understanding the complex photochemistry of an urban atmosphere.…”

Section: Introductionmentioning

confidence: 95%

“…The OH chain length can be calculated by Eq. (3) when the reaction between OH and NO 2 is the main termination reaction of radicals (Martinez et al, 2003;Mao et al, 2010):…”

Section: Evaluation Of Aoc and Photochemical Reactivitymentioning

confidence: 99%

“…High temperature and high radiation promote HO x cycling reactions, which is also affected by the abundance of other atmospheric compounds (Coates et al, 2016;Xing et al, 2017). This cycling is closely related to atmospheric photochemical reactivity, especially the generation of ozone, secondary aerosols and other pollutants (Mao et al, 2010;Xue et al, 2016). The radical cycling is terminated by their crossreactions with NO x under high-NO x conditions (e.g., OH + NO 2 , RO 2 + NO and RO 2 + NO 2 ) and RO x under low-NO x conditions (e.g., HO 2 + HO 2 , RO 2 + HO 2 and RO 2 + RO 2 ), which results in the formation of nitric acid, organic nitrates and peroxides (Wood et al, 2009;Liu et al, 2012;Xue et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Zhu

Wang

et al. 2020

Atmos. Chem. Phys.

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Abstract. An observation-based model coupled to the Master Chemical Mechanism (V3.3.1) and constrained by a full suite of observations was developed to study atmospheric oxidation capacity (AOC), OH reactivity, OH chain length and HOx (=OH+HO2) budget for three different ozone (O3) concentration levels in Shanghai, China. Five months of observations from 1 May to 30 September 2018 showed that the air quality level is lightly polluted or worse (Ambient Air Quality Index, AQI, of > 100) for 12 d, of which ozone is the primary pollutant for 10 d, indicating ozone pollution was the main air quality challenge in Shanghai during summer of 2018. The levels of ozone and its precursors, as well as meteorological parameters, revealed the significant differences among different ozone levels, indicating that the high level of precursors is the precondition of ozone pollution, and strong radiation is an essential driving force. By increasing the input JNO2 value by 40 %, the simulated O3 level increased by 30 %–40 % correspondingly under the same level of precursors. The simulation results show that AOC, dominated by reactions involving OH radicals during the daytime, has a positive correlation with ozone levels. The reactions with non-methane volatile organic compounds (NMVOCs; 30 %–36 %), carbon monoxide (CO; 26 %–31 %) and nitrogen dioxide (NO2; 21 %–29 %) dominated the OH reactivity under different ozone levels in Shanghai. Among the NMVOCs, alkenes and oxygenated VOCs (OVOCs) played a key role in OH reactivity, defined as the inverse of the OH lifetime. A longer OH chain length was found in clean conditions primarily due to low NO2 in the atmosphere. The high level of radical precursors (e.g., O3, HONO and OVOCs) promotes the production and cycling of HOx, and the daytime HOx primary source shifted from HONO photolysis in the morning to O3 photolysis in the afternoon. For the sinks of radicals, the reaction with NO2 dominated radical termination during the morning rush hour, while the reactions of radical–radical also contributed to the sinks of HOx in the afternoon. Furthermore, the top four species contributing to ozone formation potential (OFP) were HCHO, toluene, ethylene and m/p-xylene. The concentration ratio (∼23 %) of these four species to total NMVOCs is not proportional to their contribution (∼55 %) to OFP, implying that controlling key VOC species emission is more effective than limiting the total concentration of VOC in preventing and controlling ozone pollution.

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Section: Introductionmentioning

confidence: 95%

“…The OH chain length can be calculated by Eq. (3) when the reaction between OH and NO 2 is the main termination reaction of radicals (Martinez et al, 2003;Mao et al, 2010):…”

Section: Evaluation Of Aoc and Photochemical Reactivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Zhu

Wang

et al. 2020

Atmos. Chem. Phys.

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“…following equation is used to calculate the OFP for each VOC species (Schmitz et al, 2000;Ma et al, 2019),…”

mentioning

confidence: 99%

“…Due to the different composition profile of VOCs, the contribution of VOC to OFP is quite different in the other areas of China. For example, in Shenyang the top three contributors were aromatics (31.2%), alkenes (25.7%) and OVOCs (25.6%)(Ma et al, 2019); OVOCs (34.0-50.8%) dominated OFP in Guangzhou(Yuan et al, 2012); alkenes (48.34%) was the main contributor in Wuhan(Hui et al, 2018), while alkanes, 395 alkenes, and aromatics accounted for 57%, 23%, and 20% in Lanzhou, respectively(Jia et al, 2016).The top 12 NMVOCs in OFP and their average concentrations during the three cases are shown inFig. 8.…”

mentioning

confidence: 99%

Observationally constrained modelling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Zhu¹,

Wang²,

Wang³

et al. 2019

Preprint

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An observation-based model coupled to the Master Chemical Mechanism (V3.3.1) and constrained by a full suite of observations was developed to study atmospheric oxidation capacity (AOC), OH reactivity, OH chain length, and HOx (= OH + HO2) budget for three different ozone (O3) concentration levels in Shanghai, China. Five months of observation from 1 May to 30 September 2018 showed that 10 days with ozone as the primary pollutant occurred and the days with good air quality 20 (AQI < 100) accounted for 92.2% during this spring-summer time. The levels of ozone and its precursors, as well as meteorological parameters revealed the significant differences among different ozone levels, indicating that the high level of precursors is the premise of ozone pollution, and strong radiation is an essential driving force. By increasing the input JNO 2 value by 40%, the simulated O3 level increased by 30-40% correspondingly under the same level of precursors. The simulation results show that AOC, dominated by reactions involving OH radical during the daytime, has a positive correlation with ozone 25 levels. The reactions with non-methane volatile organic compounds (NMVOCs) (30%-36%), carbon monoxide (CO) (26%-31%), and nitrogen dioxide (NO2) (21%-29%) dominated the OH reactivity under different ozone levels in Shanghai. Among the NMVOCs, alkenes and oxygenated VOCs (OVOCs) played a key role in OH reactivity defined as the inverse of OH lifetime. A longer OH chain length was found in clean condition primarily due to low NO2 in the atmosphere. The high level of radical precursors (e.g., O3, HONO, and OVOCs) promotes the production and cycling of HOx, and the daytime HOx primary 30 source shifted from the HONO photolysis in the morning to the O3 photolysis in the afternoon. For the sinks of radicals, the reaction with NO2 completely dominated radicals termination during the morning rush hour, while the reactions of radicalradical also contributed to the sinks of HOx in the afternoon. Furthermore, the top four species contributing to ozone formation potential (OFP) were HCHO, toluene, ethylene, and m/p-xylene. The concentration ratio (~23%) of these four species is not proportional to their contribution (~55%) to OFP, implying that controlling key VOC species emission is more effective than 35 https://doi.

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Formation potential and source contribution of secondary organic aerosol from volatile organic compounds

et al. 2022

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Secondary organic aerosol (SOA), a key constituent of fine particulate matter, can be formed through the oxidation of volatile organic compounds (VOCs). However, information on its relevant emission sources remains limited in many cities, especially concerning different types of land use. In this study, VOC concentration in Bangkok Metropolitan Region (BMR), Thailand, was continuously collected for 24 h by 6-L evacuated canister and analyzed by gas chromatography/mass spectrophotometry following USEPA TO15, and the formation of SOA was evaluated through the comprehensive direct measurements and speciation of ambient VOCs. Finally, source contribution of VOCs to SOA formation was characterized using the Positive Matrix Factorization (PMF) model. The results revealed the abundant group of VOCs species in the overall BMR was oxygenated VOCs, accounting for 49.97-57.37%. The SOA formation potential (SOAP) ranged from 1,134.33 to 3,143.74 μg m −3 . The VOC species contributing to the highest SOAP was toluene. Results from the PMF model revealed the dominant emission source of VOCs that greatly contributed to SOA was vehicle exhaust emission. Industrial combustion was the main source of VOC emission contributing to SOA in industrial areas. Sources of fuel evaporation, biomass burning, and cooking were also found in the study areas but in small quantities. The results of this study elucidated that different emission sources of VOCs contribute to SOA with respect to different types of land use. Findings of this study highlight the necessity to identify the contribution of potential emission sources of SOA precursors to effectively manage urban air pollution.

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The levels, sources and reactivity of volatile organic compounds in a typical urban area of Northeast China

Cited by 54 publications

References 49 publications

Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Observationally constrained modelling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Formation potential and source contribution of secondary organic aerosol from volatile organic compounds

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