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DOI	10.1016/j.atmosenv.2020.117377
	Impacts of meteorology and emission control on the abnormally low particulate matter concentration observed during the winter of 2017
	Xu X.; Jiang Z.; Li J.; Chu Y.; Tan W.; Li C.
发表日期	2020
ISSN	1352-2310
卷号	225
英文摘要	As the capital of China, Beijing is the subject of great concern regarding atmospheric pollution, especially that of fine particulate matter (PM2.5). In winter 2017 (i.e., November 2017 to February 2018), PM2.5 concentration in Beijing decreased to its lowest value in the past ten years. In this study, we sought to investigate the impacts of meteorology and emission control on this abnormally low pollution phenomenon. Weather Research and Forecasting coupled with Chemistry (WRF-Chem) simulations show that sensitivity to meteorological factors accounts for approximately 51% of the observed change between winters 2016 and 2017 in Beijing. We further compared the pollution dispersion condition of winters 2016 and 2017 in terms of large-scale circulation patterns and local mixing layer heights (MLHs). The meteorological condition in 2017 was characterized by stronger wind speed (WS) and higher MLH. We classified circulation patterns into two types using the obliquely rotated Principal Component Analysis in T-mode (T-PCA) method. Active weather was found to be associated with high MLH, high near-surface WS, and high ventilation coefficient (VC), which favors the dispersion of pollutants. In contrast, the changes of meteorological variables and pollution conditions are almost opposite for stable weather. Active weather amounted to 73 and 85 days for winters 2016 and 2017, respectively. Stable weather conditions prevailed on 46 days in winter 2016, and 32 days in 2017. Less stable weather during winter 2017 compared with that of winter 2016 possibly favored efficient ventilation of boundary-layer pollution. A lack of persistent stable weather also contributed to low PM2.5 concentration in 2017. This research is important for air-pollution assessment and regional environmental management. © 2020 Elsevier Ltd
英文关键词	Beijing; Circulation pattern; Emission control; Mixing layer height; PM2.5; Ventilation coefficient
语种	英语
scopus关键词	Air pollution; Boundary layers; Emission control; Environmental management; Meteorology; Mixing; Particles (particulate matter); Principal component analysis; Ventilation; Wind; Beijing; Circulation patterns; Fine particulate matter (PM2.5); Large-scale circulation patterns; Mixing layer height; PM2.5; Rotated principal components; Weather research and forecasting; Weather forecasting; atmospheric pollution; boundary layer; climate conditions; concentration (composition); emission control; environmental management; meteorology; particulate matter; spatiotemporal analysis; winter; air pollution control; article; boundary layer; China; environmental management; forecasting; meteorology; particulate matter; pollutant; principal component analysis; simulation; weather; wind speed; winter; Beijing [China]; Beijing [China]; China
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129592
作者单位	Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Xu X.,Jiang Z.,Li J.,et al. Impacts of meteorology and emission control on the abnormally low particulate matter concentration observed during the winter of 2017[J],2020,225.
APA	Xu X.,Jiang Z.,Li J.,Chu Y.,Tan W.,&Li C..(2020).Impacts of meteorology and emission control on the abnormally low particulate matter concentration observed during the winter of 2017.Atmospheric Environment,225.
MLA	Xu X.,et al."Impacts of meteorology and emission control on the abnormally low particulate matter concentration observed during the winter of 2017".Atmospheric Environment 225(2020).