Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020
Haze is a majorly disastrous type of weather in China, especially central and eastern of China. The development of haze is mainly caused by highly concentrated fine particles (PM<sub>2.5</sub>) on a regional scale. Here, we present the results from an autumn and winter study conducted fr...
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MDPI AG
2022-01-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/13/1/134 |
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| author | Qi Jiang Hengde Zhang Fei Wang Fei Wang |
| author_facet | Qi Jiang Hengde Zhang Fei Wang Fei Wang |
| author_sort | Qi Jiang |
| collection | DOAJ |
| description | Haze is a majorly disastrous type of weather in China, especially central and eastern of China. The development of haze is mainly caused by highly concentrated fine particles (PM<sub>2.5</sub>) on a regional scale. Here, we present the results from an autumn and winter study conducted from 2013 to 2020 in seven highly polluted areas (27 representative stations) in central and eastern China to analyze the growth mechanism of PM<sub>2.5</sub>. At the same time, taking Beijing Station as an example, the characteristics of aerosol composition and particle size in the growth phase are analyzed. Taking into account the regional and inter-annual differences of fine particles (PM<sub>2.5</sub>) distribution, the local average PM<sub>2.5</sub> growth value of the year is used as the boundary value for dividing slow, rapid, and explosive growth (only focuses on the hourly growth rate greater than 0). The average value of PM<sub>2.5</sub> in the autumn and winter of each regional representative station shows a decreasing trend as a whole, especially after 2017, whereby the decreasing trend was significant. The distribution value of +ΔPM<sub>2.5</sub> (PM<sub>2.5</sub> hourly growth rate) in the north of the Huai River is lower than that in the south of the Huai River, and both of the +ΔPM<sub>2.5</sub> after 2017 showed a significant decreasing trend. The average PM<sub>2.5</sub> threshold before the explosive growth is 70.8 µg m<sup>−3</sup>, and the threshold that is extremely prone to explosive growth is 156 µg m<sup>−3</sup> to 277 µg m<sup>−3</sup> in north of the Huai River. For the area south of the Huai River, the threshold for PM<sub>2.5</sub> explosive growth is relatively low, as a more stringent threshold also puts forward stricter requirements on atmospheric environmental governance. For example, in Beijing, the peak diameters gradually shift to larger sizes when the growth rate increases. The number concentration increasing mainly distributed in Aitken mode (AIM) and Accumulation mode (ACM) during explosive growth. Among the various components of submicron particulate matter (PM<sub>1</sub>), organic aerosol (OA), especially primary OA (POA), have become one of the most critical components for the PM<sub>2.5</sub> explosive growth in Beijing. During the growth period, the contribution of secondary particulate matter (SPM) to the accumulated pollutants is significantly higher than that of primary particulate matter (PPM). However, the proportion of SPM gradually decreases when the growth rate increases. The contribution of the PPM can reach 48% in explosive growth. Compared to slow and rapid growth, explosive growth mainly occurs in the stable atmosphere of higher humidity, lower pressure, lower temperature, small winds, and low mixed layers. |
| first_indexed | 2024-03-10T01:55:45Z |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-10T01:55:45Z |
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| spelling | doaj.art-33f20dbe9fdb401596288922ea5196762023-11-23T12:57:44ZengMDPI AGAtmosphere2073-44332022-01-0113113410.3390/atmos13010134Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020Qi Jiang0Hengde Zhang1Fei Wang2Fei Wang3National Meteorological Centre, Beijing 100081, ChinaNational Meteorological Centre, Beijing 100081, ChinaChinese Academy of Meteorological Sciences, Beijing 100081, ChinaBeijing Municipal Weather Modification Office, Beijing 100089, ChinaHaze is a majorly disastrous type of weather in China, especially central and eastern of China. The development of haze is mainly caused by highly concentrated fine particles (PM<sub>2.5</sub>) on a regional scale. Here, we present the results from an autumn and winter study conducted from 2013 to 2020 in seven highly polluted areas (27 representative stations) in central and eastern China to analyze the growth mechanism of PM<sub>2.5</sub>. At the same time, taking Beijing Station as an example, the characteristics of aerosol composition and particle size in the growth phase are analyzed. Taking into account the regional and inter-annual differences of fine particles (PM<sub>2.5</sub>) distribution, the local average PM<sub>2.5</sub> growth value of the year is used as the boundary value for dividing slow, rapid, and explosive growth (only focuses on the hourly growth rate greater than 0). The average value of PM<sub>2.5</sub> in the autumn and winter of each regional representative station shows a decreasing trend as a whole, especially after 2017, whereby the decreasing trend was significant. The distribution value of +ΔPM<sub>2.5</sub> (PM<sub>2.5</sub> hourly growth rate) in the north of the Huai River is lower than that in the south of the Huai River, and both of the +ΔPM<sub>2.5</sub> after 2017 showed a significant decreasing trend. The average PM<sub>2.5</sub> threshold before the explosive growth is 70.8 µg m<sup>−3</sup>, and the threshold that is extremely prone to explosive growth is 156 µg m<sup>−3</sup> to 277 µg m<sup>−3</sup> in north of the Huai River. For the area south of the Huai River, the threshold for PM<sub>2.5</sub> explosive growth is relatively low, as a more stringent threshold also puts forward stricter requirements on atmospheric environmental governance. For example, in Beijing, the peak diameters gradually shift to larger sizes when the growth rate increases. The number concentration increasing mainly distributed in Aitken mode (AIM) and Accumulation mode (ACM) during explosive growth. Among the various components of submicron particulate matter (PM<sub>1</sub>), organic aerosol (OA), especially primary OA (POA), have become one of the most critical components for the PM<sub>2.5</sub> explosive growth in Beijing. During the growth period, the contribution of secondary particulate matter (SPM) to the accumulated pollutants is significantly higher than that of primary particulate matter (PPM). However, the proportion of SPM gradually decreases when the growth rate increases. The contribution of the PPM can reach 48% in explosive growth. Compared to slow and rapid growth, explosive growth mainly occurs in the stable atmosphere of higher humidity, lower pressure, lower temperature, small winds, and low mixed layers.https://www.mdpi.com/2073-4433/13/1/134PM<sub>2.5</sub>explosive growthchemical compositionsdiameterthreshold |
| spellingShingle | Qi Jiang Hengde Zhang Fei Wang Fei Wang Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020 Atmosphere PM<sub>2.5</sub> explosive growth chemical compositions diameter threshold |
| title | Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020 |
| title_full | Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020 |
| title_fullStr | Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020 |
| title_full_unstemmed | Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020 |
| title_short | Research on the Growth Mechanism of PM<sub>2.5</sub> in Central and Eastern China during Autumn and Winter from 2013–2020 |
| title_sort | research on the growth mechanism of pm sub 2 5 sub in central and eastern china during autumn and winter from 2013 2020 |
| topic | PM<sub>2.5</sub> explosive growth chemical compositions diameter threshold |
| url | https://www.mdpi.com/2073-4433/13/1/134 |
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