Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart, Germany

Huang, Wei; Saathoff, H.; Shen, Xiaoli; Ramisetty, Ramakrishna; Leisner, Thomas; Mohr, Claudia

doi:10.5194/acp-19-11687-2019

Cited by 48 publications

(57 citation statements)

References 73 publications

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“…One explanation was due to the higher contributions of POA in winter which is generally more volatile than SOA (Huffman et al, 2009). This feature is contrast to that in Germany (Huang et al, 2019), where organics are found to be more volatile in summer. Such discrepancy is likely due to the different OA composition in different chemical environment.…”

Section: Volatility Of Oa Speciesmentioning

confidence: 82%

“…The volatility of OA also presents strong seasonal variations. For example, Huang et al (2019) found that OA in winter is less volatile than that in summer in Germany. The volatility of cooking OA (COA) and hydrocarbon-like OA (HOA) at the same sampling site varied substantially between summer and winter (Saha et al, https://doi.org/10.5194/acp-2020-1105 Preprint.…”

Section: Introductionmentioning

confidence: 99%

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Organic aerosol volatility and viscosity in North China Plain: Contrast between summer and winter

Xu¹,

Chen²,

Qiu³

et al. 2020

Preprint

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Abstract. Volatility and viscosity have substantial impacts on gas-particle partitioning, formation and evolution of aerosol, and hence the predictions of aerosol related air quality and climate effects. Here aerosol volatility and viscosity at a rural site (Gucheng) and an urban site (Beijing) in North China Plain (NCP) in summer and winter were investigated by using a thermodenuder coupled with high resolution aerosol mass spectrometer. The effective saturation concentration (C*) of organic aerosol (OA) in summer was smaller than that in winter (0.55 μg m−3 vs. 0.71–0.75 μg m−3), indicating that OA in winter in NCP is more volatile due to enhanced primary emissions from coal combustion and biomass burning. The volatility distributions varied largely different among different OA factors. In particular, we found that hydrocarbon-like OA (HOA) contained more non-volatile compounds compared to coal combustion related OA. The more oxidized oxygenated OA (MO-OOA) showed overall lower volatility than less oxidized OOA (LO-OOA) in both summer and winter, yet the volatility of MO-OOA was found to be relative humidity (RH) dependent showing more volatile properties at higher RH. Our results demonstrated the different composition and chemical formation pathways of MO-OOA under different RH levels. The glass transition temperature (Tg) and viscosity of OA in summer and winter are estimated using the recently developed parameterization formula. Our results showed that the Tg of OA in summer in Beijing (291.5 K) was higher than that in winter (289.7–290.0 K), while it varied greatly among different OA factors. The viscosity suggested that OA existed mainly as solid in winter in Beijing, but as semi-solids in Beijing in summer and Gucheng in winter. These results have important implications that kinetically limited gas-particle partitioning may need to be considered when simulating secondary OA formation in NCP.

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Section: Volatility Of Oa Speciesmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Organic aerosol volatility and viscosity in North China Plain: Contrast between summer and winter

Xu¹,

Chen²,

Qiu³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…There was no rainfall over the NCP during both periods, so L wetscav was 0. The chemical loss of PM 2.5 (L chem ) has been shown to be two orders of magnitude smaller than the removal rates of ventilation and deposition, especially in winter (Guth et al, 2018;Huang et al, 2019). The simulated mass of PM 2.5 in the boundary layer of the NCP averaged during the clean and polluted periods were 7.3 × 10 16 µg and 1.0 × 10 17 µg, respectively.…”

Section: Simulation Of the Severe Haze Pollution Event Meteorologicalmentioning

confidence: 98%

Emergency Response Measures to Alleviate a Severe Haze Pollution Event in Northern China during December 2015: Assessment of Effectiveness

Huang

et al. 2020

Aerosol Air Qual. Res.

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Using the WRF-Chem model, we simulated the surface PM 2.5 concentrations on the North China Plain (NCP) during a severe winter haze episode (December 6-10, 2015) with the goal of assessing the effectiveness of the implemented emergency response measures (ERMs) in alleviating the pollution. We estimated that the ERMs decreased the anthropogenic pollutant emissions, with the exception of NH 3 , by 8-48% during this event. Inputting these reduced emission estimates, our simulations reproduced the observed PM 2.5 concentrations and compositions. Stagnant regional meteorological conditions increased the lifetime of the PM 2.5 in the NCP boundary layer from 1 day during the clean period to 5 days during the haze episode. Additionally, local emissions accounted for approximately only 20% of the surface PM 2.5 in Beijing but more than 62% over the rest of the NCP. We found that the ERMs achieved a modest reduction in the mean surface PM 2.5 concentrations during the event, decreasing them by 7% and 4% in Beijing and across the rest of the NCP, respectively. The limited effect was due to the duration of the ERMs being much shorter than the lifetime of the PM 2.5 , which prevented the concentrations of the latter from fully reflecting the reduction in emissions. We conclude that anthropogenic emissions on the NCP during severe winter haze episodes must be reduced by a much larger percentage to substantially abate the PM 2.5 concentrations.

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“…The residence time (RT) of aerosol particles in TD was 7.4 s in the summer of 2018 and 10 s in the winters of 2018 and 2019 due to different plug flow rate. The TD loss (90 %) was calibrated using aerosolized NaCl following the methods described by Huffman et al (2008).…”

Section: Measurementsmentioning

confidence: 99%

Organic aerosol volatility and viscosity in the North China Plain: contrast between summer and winter

Chen

Qiu

et al. 2021

Atmos. Chem. Phys.

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Abstract. Volatility and viscosity have substantial impacts on gas–particle partitioning, formation and evolution of aerosol and hence the predictions of aerosol-related air quality and climate effects. Here aerosol volatility and viscosity at a rural site (Gucheng) and an urban site (Beijing) in the North China Plain (NCP) in summer and winter were investigated by using a thermodenuder coupled with a high-resolution aerosol mass spectrometer. The effective saturation concentration (C*) of organic aerosol (OA) in summer was smaller than that in winter (0.55 µg m−3 vs. 0.71–0.75 µg m−3), indicating that OA in winter in the NCP is more volatile due to enhanced primary emissions from coal combustion and biomass burning. The volatility distributions varied and were largely different among different OA factors. In particular, we found that hydrocarbon-like OA (HOA) contained more nonvolatile compounds compared to coal-combustion-related OA. The more oxidized oxygenated OA (MO-OOA) showed overall lower volatility than less oxidized OOA (LO-OOA) in both summer and winter, yet the volatility of MO-OOA was found to be relative humidity (RH) dependent showing more volatile properties at higher RH. Our results demonstrated the different composition and chemical formation pathways of MO-OOA under different RH levels. The glass transition temperature (Tg) and viscosity of OA in summer and winter are estimated using the recently developed parameterization formula. Our results showed that the Tg of OA in summer in Beijing (291.5 K) was higher than that in winter (289.7–290.0 K), while it varied greatly among different OA factors. The viscosity suggested that OA existed mainly as solid in winter in Beijing (RH = 29 ± 17 %), but as semisolids in Beijing in summer (RH = 48 ± 25 %) and Gucheng in winter (RH = 68 ± 24 %). These results have the important implication that kinetically limited gas–particle partitioning may need to be considered when simulating secondary OA formation in the NCP.

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Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart, Germany

Cited by 48 publications

References 73 publications

Organic aerosol volatility and viscosity in North China Plain: Contrast between summer and winter

Organic aerosol volatility and viscosity in North China Plain: Contrast between summer and winter

Emergency Response Measures to Alleviate a Severe Haze Pollution Event in Northern China during December 2015: Assessment of Effectiveness

Organic aerosol volatility and viscosity in the North China Plain: contrast between summer and winter

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