北京市秋冬季环流型下的细颗粒物传输

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Abstract Models-3/CMAQ was applied to simulate fine particulate matter (PM_2.5) during autumn and winter (Nov.-Feb., 2013~2018) in Beijing, and was used to calculate PM_2.5 transport flux on four cross sections around Beijing, which can combine with flow field and concentration to investigate PM_2.5 transport characteristics in 11 atmospheric circulation types in Beijing. In heavy polluted southwest (SW) and west (W) circulation types, PM_2.5 strong transport suffered Beijing, the input flux from the southern plain had very strong input accumulation effect below 0.6km, which increased the pollution level of PM_2.5 in Beijing. In heavy polluted south (S) circulation type, the input flux of the eastern plain below 0.6km and the input flux of the southern plain above 0.6km had strong input accumulation effect, so PM_2.5 transport from eastern and southern areas of Beijing-Tianjin-Hebei region in different altitude ranges affect PM_2.5 level in Beijing. In uniform pressure fields (UM) and cyclone (C) circulation types, transport in all directions had no obvious input accumulation effect, so the reduction of local emissions was particularly important for pollution control. In moderately polluted east (E) and southeast (SE) circulation types, Beijing had a large output flux below 0.2km to the northern cities such as Baoding through the southern plain section, which had strong output dissipation effect on Beijing pollution. In clean northern (N), northeast (NE) and northwest (NW) circulation types, Beijing had a very large output flux below 1km to the eastern cities such as Langfang and Tianjin through the eastern plain section, which had very strong output dissipation effect on Beijing pollution. In clean polluted anticyclone (A) circulation type, Beijing had no obvious PM_2.5 input and output phenomena.

Key words： circulation type fine particulate matter CMAQ transport flux Beijing

Received: 22 June 2020

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X513

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	Articles by authors
	LIN Ting-kun
	QU Kun
	YAN Yu
	WANG Xue-song
	ZHAO Ning

Cite this article:

LIN Ting-kun,QU Kun,YAN Yu等. Fine particulate matter transport driven by circulation types in autumn and winter over Beijing area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 548-557.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/548

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