2016~2020年北京城区和郊区PM<sub>2.5</sub>爆发性增长特征对比研究

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Abstract The difference of pollution characteristics between urban and rural stations in Beijing from 2016 to 2020 was analysed using PM_2.5 concentration, meteorological observational data, NCEP and ECMWF reanalysis dataset. Explosive growth processes were defined based on multiple threshold metrics, focusing on the analysis of atmospheric circulation and different sources of pollutants in the process of explosive growth. The results showed that the number of air pollution days had decreased year by year, while the proportion of pollution days in autumn and winter decreased from 2016 to 2017. In addition, the proportion of pollution days increased from 2018 to 2020. The pollution improvement at urban stations was slower than that at rural stations. The duration of pollution were generally less than or equal to 3d from 2016 to 2020. The number of air pollution days at urban stations were more than that at rural stations when the duration of pollution were more or equal to 2d, and the frequency of air pollution days had decreased year by year. There were obvious mutual influence characteristics of fine particulate pollution at urban stations and rural stations, and the impact of urban stations on rural stations was more significant. The number of explosive growth and the proportion of explosive pollution at urban stations and rural stations first decreased and then increased. The number of explosive growth process at urban stations was more than that at rural stations, however, the proportion of explosive pollution in urban areas was lower than that in suburbs. Most of the explosive growth processes occurred under types of uniform pressure field, such as the front of high pressure, zonal circulation and behind trough (the frequency of explosive growth were ≥10%).The transmission during explosive growth processes at urban station occurred most frequently under the weather type of behind trough and the front of high pressure, with an occurrence frequency of 37.0%. The transmission during explosive growth processes at rural station occurred most frequently under the weather type of zonal circulation and the front of high pressure, with an occurrence frequency of 31.6%. The local explosive growth at urban and rural stations occured most frequently under the weather type of zonal circulation and uniform pressure field, with the exceeding ratio of 34.5% and 56.5% respectively.

Key words： explosive growth PM_2.5 circulation situation transmission type local type

Received: 29 July 2022

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X513

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	YOU Yuan
	ZHANG Bi-hui
	LI Si-teng
	JIANG Qi
	AN Lin-chang

Cite this article:

YOU Yuan,ZHANG Bi-hui,LI Si-teng等. The contrast study of the characteristics of PM_2.5 explosive growth at urban and rural stations in Beijing from 2016 to 2020[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1489-1498.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1489

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