Fine particulate matter transport driven by circulation types in autumn and winter over Beijing area
LIN Ting-kun1,2, QU Kun1, YAN Yu1, WANG Xue-song1, ZHAO Ning2
1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; 2. China Southern Power Grid Technology Co., Ltd., Guangzhou, Guangdong 510080, China
Abstract：Models-3/CMAQ was applied to simulate fine particulate matter (PM2.5) during autumn and winter (Nov.-Feb., 2013~2018) in Beijing, and was used to calculate PM2.5 transport flux on four cross sections around Beijing, which can combine with flow field and concentration to investigate PM2.5 transport characteristics in 11 atmospheric circulation types in Beijing. In heavy polluted southwest (SW) and west (W) circulation types, PM2.5 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 PM2.5 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 PM2.5 transport from eastern and southern areas of Beijing-Tianjin-Hebei region in different altitude ranges affect PM2.5 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 PM2.5 input and output phenomena.
林廷坤, 屈坤, 严宇, 王雪松, 赵宁. 北京市秋冬季环流型下的细颗粒物传输[J]. 中国环境科学, 2021, 41(2): 548-557.
LIN Ting-kun, QU Kun, YAN Yu, WANG Xue-song, ZHAO Ning. Fine particulate matter transport driven by circulation types in autumn and winter over Beijing area. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 548-557.
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