Measurement report: Size distributions of urban aerosols down to 1 nm from long-term measurements,Atmospheric Chemistry and Physics

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Measurement report: Size distributions of urban aerosols down to 1 nm from long-term measurements
Atmospheric Chemistry and Physics ( IF 6.3 ) Pub Date : 2022-06-17 , DOI: 10.5194/acp-2022-414
Chenjuan Deng , Yiran Li , Chao Yan , Jin Wu , Runlong Cai , Dongbin Wang , Yongchun Liu , Juha Kangasluoma , Veli-Matti Kerminen , Markku Kulmala , Jingkun Jiang

Abstract. The size distributions of urban atmospheric aerosols convey important information on their origins and impacts. Their long-term characteristics, especially for sub-3 nm particles, are still limited. In this study, we examined the characteristics of atmospheric aerosol size distributions down to 1 nm based on four-year measurements in urban Beijing. Using cluster analysis, three typical types of number size distributions were identified, i.e., daytime new particle formation (NPF) type, daytime non-NPF type, and nighttime type. Combining a power law distribution and multiple lognormal distributions can well represent the sharp concentration decrease of sub-3 nm particles with increasing size and the modal characteristics for those above 3 nm in the submicron size range. The daytime NPF type exhibits high concentrations of sub-3 nm aerosols together with other three modes. However, both the daytime non-NPF type and the nighttime type have a low abundance of sub-3 nm aerosol particles together with only two distinct modes. In urban Beijing, the concentration of H₂SO₄ monomer during the daytime with NPF is similar to that during the daytime without NPF, while significantly higher than that during the nighttime. The concentration of atmospheric sub-3 nm particles on NPF days has a strong seasonality while their seasonality on non-NPF days is less pronounced. In addition to NPF as the most important source, we show that vehicles can emit sub-3 nm particles as well, although their influence on the measured aerosol population strongly depends on the distance from the road.

更新日期：2022-06-20

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