The promotion effect of nitrous acid on aerosol formation in wintertime Beijing: possible contribution of traffic-related emission

Liu, Yongchun; Zhang, Yusheng; Lian, Chaofan; Yan, Chao; Feng, Zeming; Zheng, Feixue; Fan, Xiaoliang; Chen, Yan; Wang, Weigang; Chu, Biwu; Wang, Yonghong; Cai, Jun; Du, Yong; Daellenbach, Kaspar R.; Kangasluoma, Juha; Bianchi, Federico; Kujansuu, Joni; Petäj̈ä, Tuukka; Wang, Xuefei; Hu, Bo; Wang, Yuesi; Ge, Maofa; He, Haibo; Kulmala, Markku

doi:10.5194/acp-2020-150

Cited by 2 publications

(1 citation statement)

References 74 publications

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“…This station is located about 150 m away from the nearest road (Zizhuyuan road) and 500 m away from the West Third Ring Road, and it is surrounded by commercial properties and residential dwellings representative of an urban environment. More details on the location can be found in (Liu et al, 2020;Zhou et al, 2020).…”

Section: Measurement Location and Instrumentationsmentioning

confidence: 99%

Rapid mass growth and enhanced light extinction of atmospheric aerosols during the heating season haze episodes in Beijing revealed by aerosol-chemistry-radiation-boundary layer interaction

Lin¹,

Wang²,

Zheng³

et al. 2020

Preprint

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Abstract. Despite the numerous studies investigating haze formation mechanism in China, it is still puzzling that intensive haze episodes could form within hours directly following relatively clean periods. Haze has been suggested to be initiated by the variation of meteorological parameters and then to be substantially enhanced by aerosol-radiation-boundary layer feedback. However, knowledge on the detailed chemical processes and the driving factors for extensive aerosol mass accumulation during the feedback is still scarce. Here, the dependency of the aerosol number size distribution, mass concentration and chemical composition on the daytime mixing layer height (MLH) in urban Beijing is investigated. The size distribution and chemical composition-resolved dry aerosol light extinction is also explored. The results indicate that the aerosol mass concentration and fraction of nitrate increased dramatically when the MLH decreased from high to low conditions, corresponding to relatively clean and polluted conditions, respectively. Particles having their dry diameters in the size of ~ 400–700 nm, and especially particle-phase ammonium nitrate and liquid water, contributed greatly to visibility degradation during the winter haze periods. The dependency of aerosol composition on the MLH revealed that ammonium nitrate and aerosol water content increased the most during low MLH conditions, which may have further triggered enhanced formation of sulphate and organic aerosol via heterogeneous reactions. As a result, more sulphate, nitrate and water soluble organics were formed, leading to an enhanced water uptake ability and increased light extinction by the aerosols. The results of this study contribute towards a more detailed understanding of the aerosol-chemistry-radiation-boundary layer feedback that is likely to be responsible for explosive aerosol mass growth events in urban Beijing.

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Section: Measurement Location and Instrumentationsmentioning

confidence: 99%

Rapid mass growth and enhanced light extinction of atmospheric aerosols during the heating season haze episodes in Beijing revealed by aerosol-chemistry-radiation-boundary layer interaction

Lin¹,

Wang²,

Zheng³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

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Assessment of Daytime HONO Emission Source from Asphalt Surface to Urban Air

Kim

Lee

et al. 2021

Applied Sciences

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Existing studies suggest various potential daytime sources of atmospheric nitrous acid (HONO), including photolysis surface reactions and photo-enhanced NO2 conversion on organic surfaces. However, the understanding of daytime HONO sources is still inadequate. In this study, we report the HONO formation on asphalt surfaces under various NO2, VOCs (toluene and hexane), and UV irradiance conditions using a continuous flow chamber. Although no HONO formation was found without light exposure, the light threshold for HONO formation on the asphalt surface was very low, with a total UV (TUV) of 0.7 W m−2. HONO formation on the asphalt surface was linearly dependent on NO2 up to 300 ppb in the presence of VOCs, but no HONO formation was observed with humified air and NO2. HONO production was saturated at high hydrocarbon concentrations and light intensities. The calculated first-order NO2 conversion rate to HONO on the asphalt surface was 1.2 × 10−4 s −1. The observed mean HONO emission flux was 1.3 × 109 molecules cm−2 s −1 with a similar range of those on other urban covered surfaces. The calculated vertical HONO profile using the measured HONO emission flux and 1-D steady state model revealed that the asphalt surface may account for 13% of daytime HONO in the elevated on-road pollutant concentrations in Seoul. However, we show that its HONO contribution could be much higher on real-life road surfaces directly exposed to much higher NO2 emissions from vehicle exhaust.

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The promotion effect of nitrous acid on aerosol formation in wintertime Beijing: possible contribution of traffic-related emission

Cited by 2 publications

References 74 publications

Rapid mass growth and enhanced light extinction of atmospheric aerosols during the heating season haze episodes in Beijing revealed by aerosol-chemistry-radiation-boundary layer interaction

Rapid mass growth and enhanced light extinction of atmospheric aerosols during the heating season haze episodes in Beijing revealed by aerosol-chemistry-radiation-boundary layer interaction

Assessment of Daytime HONO Emission Source from Asphalt Surface to Urban Air

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