Simulation of secondary organic aerosol over the Yangtze River Delta region: The impacts from the emissions of intermediate volatility organic compounds and the SOA modeling framework

Huang, Ling; Wang, Qian; Wang, Yangjun; Emery, Chris; Zhu, Aimei; Zhu, Yun; Yin, Sijia; Yarwood, Greg; Zhang, Kun; Li, Li

doi:10.1016/j.atmosenv.2020.118079

Cited by 40 publications

(30 citation statements)

References 63 publications

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“…The formation of SOAs from VOCs may experience a few reaction generations (Kroll and Seinfeld, 2008) and could interact with other sources of species during the process (Shrivastava et al, 2017), thereby complicating the goal of identifying the key precursors in contributing to the consequent SOAs. In addition, some primary gases somehow already have low volatility and may not require a long reaction chain to become condensable; for example, some primarily emitted intermediate volatility organic compounds (IVOCs) may substantially contribute to the SOAs (Robinson et al, 2007;Huang et al, 2021). An understanding of the source profiles of primary emissions in both gas and aerosol phases is therefore important for ruling out the source-dependent production of SOAs.…”

Section: Introductionmentioning

confidence: 99%

Evolution of source attributed organic aerosols and gases in a megacity of central China

Liu

Liu²,

Kong³

et al. 2022

Atmos. Chem. Phys.

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Abstract. The secondary production of oxygenated organic aerosol (OOA) impacts air quality, climate, and human health. The importance of various sources in contributing to the OOA loading and associated different ageing mechanisms remains to be elucidated. Here we present a concurrent observation and factorization analysis on the mass spectra of organic aerosol (OA) by a high-resolution aerosol mass spectrometer and volatile organic compounds (VOCs) by a proton transfer reaction mass spectrometer in Wuhan, a megacity in central China, during autumn. The full mass spectra of organics with two principle anthropogenic sources were identified as the traffic and cooking sources, for their primary emission profiles in aerosol and gas phases, the evolutions, and their respective roles in producing OOA and secondary VOCs. Primary emissions in gas and aerosol phases both contributed to the production of OOA. The photooxidation of traffic sources from the morning rush hour caused a 2.5 fold increase in OOA mass in a higher oxidation state (oxygen-to-carbon ratio as O/C =0.72), co-producing gas phase carboxylic acids, while, at night, cooking aerosols and VOCs (particularly acrolein and hexanal) importantly caused the nocturnal formation of oxygenated intermediate VOCs, increasing OOA mass by a factor of 1.7 (O/C =0.42). The daytime and nighttime formation of secondary aerosols, as contributed by different sources, was found to be modulated by solar radiation and air moisture, respectively. The environmental policy should, therefore, consider the primary emissions and their respective ageing mechanisms influenced by meteorological conditions.

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Section: Introductionmentioning

confidence: 99%

Evolution of source attributed organic aerosols and gases in a megacity of central China

Liu

Liu²,

Kong³

et al. 2022

Atmos. Chem. Phys.

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“…Smog chamber studies involving individual IVOCs species, like higher n-alkanes and 2-ring aromatics, have confirmed their significantly higher SOA formation potentials (Chan et al, 2009;Presto et al, 2010;Liu et al, 2015). In addition, recent model simulations including IVOCs as SOA precursors revealed that 30% ~ 80% of ambient SOA could be explained by IVOCs (Ots et al, 2016;Zhao et al, 2016;Yang et al, 2019;Lu et al, 2020;Huang et al, 2020). However, due to lack of direct measurements, these model simulations used the ratios of IVOCs to other species like primary organic aerosol (POA) or non-methane hydrocarbons (NMHCs) to estimate IVOCs emissions.…”

Section: Introductionmentioning

confidence: 96%

“…Although previous chassis dynamometer tests used limited numbers of vehicles to characterize IVOCs emission (Zhao et al, 2015(Zhao et al, , 2016Tang et al, 2021), the results obtained from the tests were widely applied to recent models and emission inventories (Liu et al, 2017;Lu et al, 2018;Wu et al, 2019;Huang et al, 2020). However, driving conditions were recently found to significantly influence vehicular IVOCs emissions (Drozd et al, 2018;Tang et al, 2021), highlighting the importance of conducting on-road measurements of vehicle-emitted IVOCs under real-world driving condition, which could further narrow the uncertainty of vehicular IVOCs estimates in models and emission inventories.…”

Section: Introductionmentioning

confidence: 99%

“…As organic matters are often the most abundant components in PM2.5 and SOA pollution is increasingly standing out with the intensified primary emission control (Guo et al, 2020), understanding IVOC emissions from on-road vehicles is of great importance given that vehicleemitted IVOCs contribute greatly to urban SOA formation (Gentner et al, 2012;Wu et al, 2019;Huang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Measurement report: Emissions of intermediate-volatility organic compounds from vehicles under real-world driving conditions in an urban tunnel

Fang¹,

Huang²,

Zhang³

et al. 2021

Preprint

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Abstract. Intermediate-volatility organic compounds (IVOCs) emitted from vehicles are important precursors to secondary organic aerosols (SOA) in urban areas, yet vehicular emission of IVOCs, particularly from on-road fleets, is poorly understood. Here we initiated a field campaign to collect IVOCs with sorption tubes at both the inlet and the outlet in a busy urban tunnel (>30,000 vehicles per day) in south China for characterizing emissions of IVOCs from on-road vehicles. The average emission factor of IVOCs (EFIVOCs) was measured to be 16.77 ± 0.89 mg km-1 (Average ± 95% C.I.) for diesel and gasoline vehicles in the fleets, and based on linear regression the average EFIVOCs was derived to be 62.79 ± 18.37 mg km-1 for diesel vehicles and 13.95 ± 1.13 mg km-1 for gasoline vehicles. The EFIVOCs for diesel vehicles from this study was comparable to that reported previously for non-road engines without after-treatment facilities, while the EFIVOCs for gasoline vehicles from this study was much higher than that recently tested for a China V gasoline vehicle. IVOCs from the on-road fleets did not show significant correlation with the primary organic aerosol (POA) or total non-methane hydrocarbons (NMHCs) as results from previous chassis dynamometer tests. Estimated SOA production from the vehicular IVOCs and VOCs surpassed the POA by a factor of ~ 2.4, and IVOCs dominated over VOCs in estimated SOA production by a factor of ~ 7, suggesting that controlling IVOCs is of greater importance to modulate traffic-related OA in urban areas. The results demonstrated that although on-road gasoline vehicles have much lower EFIVOCs, they contribute more IVOCs than on-road diesel vehicles due to its dominance in the on-road fleets. However, due to greater diesel than gasoline fuel consumption in China, emission of IVOCs from diesel engines would be much larger than that from gasoline engines, signaling the overwhelming contribution of IVOC emissions by non-road diesel engines in China.

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“…The formation of SOA from VOCs may experience a few reaction generations (Knote et al, 2014) and could interact with other sources of species during the process (Shrivastava et al, 2017), hereby complicating the goal of identifying the key precursors in contributing to the consequent SOA. In addition, some primary gases already have somehow low volatility and may not require a long reaction chain to become condensable, such as some primarily emitted intermediate volatility organic compounds (IVOCs) may substantially contribute to the SOA (Robinson et al, 2007;Huang et al, 2021). An understanding of source profiles of primary emissions in both gas and aerosol phases is therefore important to rule out the source-dependant production of SOA.…”

Section: Introductionmentioning

confidence: 99%

Evolution of source attributed organic aerosols and gases in a megacity of central China

Liu

Kong

et al. 2022

Preprint

View full text Add to dashboard Cite

Abstract. The secondary production of the oxygenated organic aerosol (OOA) impacts air quality, climate and human health. The importance of various sources in contributing to the OOA loading and associated different aging mechanisms remains to be elucidated. Here we present concurrent observation and factorization analysis on the mass spectra of organic aerosol (OA) by a high-resolution aerosol mass spectrometer and volatile organic compounds (VOCs) by a proton-transfer-reaction mass spectrometer in Wuhan, a megacity in central China during autumntime. The full mass spectra of organics with two principle anthropogenic sources were identified as the traffic and cooking sources, for their primary emission profiles in aerosol and gas phases, the evolutions, and their respective roles in producing OOA and secondary VOCs. Primary emissions in gas and aerosol phases both contributed to the production of OOA. The photooxidation of traffic sources from morning rush-hour caused 2.5-folds increase of OOA mass in a higher oxidation state (O / C = 0.72), coproducing gas-phase carboxylic acids; while at night, cooking aerosols and VOCs (particularly acrolein and hexanal) importantly caused the nocturnal formation of oxygenated intermediate VOCs, increasing OOA mass by a factor of 1.7 (O / C = 0.42). The daytime and nighttime formation of secondary aerosols as contributed by different sources, was found to be modulated by solar radiation and air moisture respectively. The environmental policy should therefore consider the primary emissions and their respective ageing mechanisms influenced by meteorological conditions.

show abstract

Simulation of secondary organic aerosol over the Yangtze River Delta region: The impacts from the emissions of intermediate volatility organic compounds and the SOA modeling framework

Cited by 40 publications

References 63 publications

Evolution of source attributed organic aerosols and gases in a megacity of central China

Evolution of source attributed organic aerosols and gases in a megacity of central China

Measurement report: Emissions of intermediate-volatility organic compounds from vehicles under real-world driving conditions in an urban tunnel

Evolution of source attributed organic aerosols and gases in a megacity of central China

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