气候变化领域集成服务门户(CCPortal): Assessing the pollutant evolution mechanisms of heavy pollution episodes in the Yangtze-Huaihe valley: A multiscale perspective

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DOI	10.1016/j.atmosenv.2020.117986
	Assessing the pollutant evolution mechanisms of heavy pollution episodes in the Yangtze-Huaihe valley: A multiscale perspective
	Jia W.; Zhang X.; Wang Y.
发表日期	2021
ISSN	13522310
卷号	244
英文摘要	The Yangtze-Huaihe (YH) region experiences heavy aerosol pollution, characterized by high PM2.5 concentration. To unravel the pollutant evolution mechanism during the heavy pollution episodes (HPEs), this study combined observational data analysis and three-dimensional WRF-Chem simulations. From December 2, 2016 to January 15, 2017, YH region experienced 4 HPEs under the control by synoptic system, normally associated with a transport stage (TS) and a cumulative stage (CS). During the TS, pollutants are transported to the north of YH region through the near-surface, and then transported to the “mountain corridor” through the residual layer (RL) under the influence of prevailing wind. For the RL transport mechanism, the change of pollutant concentration cannot only consider the net flux in the horizontal direction, but also the role of the vertical movement is extremely important and cannot be ignored. By analyzing the mass conservation equation of pollutant, the results show that the advection transport and turbulent diffusion have a synergistic effect on the change of pollutant in the CS of three HPEs. The change of turbulence characteristics also affected by topography. For the “mountain corridors”, which is accompanied by variable wind direction and turbulence diffusion is easily affected by wind shear. In addition, the turbulence characteristics are different during the TS and CS, especially the strong stable conditions in the CS at nighttime. The turbulence is intermittent, and the model has insufficient performance for turbulence, which will lead to differences for the simulation of pollutant concentration. In short, as the PM2.5 concentration linearly increases, the friction velocity (turbulent diffusion coefficient) decreases 63% (80%), 61% (78%) and 45% (68%), respectively. Therefore, the change of pollutants is less sensitive to the change of turbulence during the HPEs. The contribution of regional transport (local emissions) reaches 43% (47%), thus we need pay attention to the contribution of each part during the HPEs, which will help us to build a certain foundation for the emission reduction work in the future. © 2020 Elsevier Ltd
英文关键词	Contribution of emissions; Residual layer; Transport and cumulative stages; Turbulent characteristics; Yangtze-Huaihe region
语种	英语
scopus关键词	Atmospheric turbulence; Diffusion; Emission control; Landforms; Topography; Advection transports; Mass conservation equations; Pollutant concentration; Transport mechanism; Turbulence characteristics; Turbulence diffusion; Turbulent diffusion; Turbulent diffusion coefficients; Air pollution; aerosol composition; air quality; atmospheric pollution; concentration (composition); emission control; pollutant transport; pollution incidence; seasonality; turbulence; advection; article; attention; case report; clinical article; data analysis; eddy diffusivity; friction; net flux; particulate matter 2.5; simulation; synergistic effect; topography; China; Huai Basin; Yangtze Valley
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/144819
作者单位	Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Center for Excellence in Regional Atmospheric Environment, IUE, Chinese Academy of Sciences, Xiamen, 361021, China
推荐引用方式 GB/T 7714	Jia W.,Zhang X.,Wang Y.. Assessing the pollutant evolution mechanisms of heavy pollution episodes in the Yangtze-Huaihe valley: A multiscale perspective[J],2021,244.
APA	Jia W.,Zhang X.,&Wang Y..(2021).Assessing the pollutant evolution mechanisms of heavy pollution episodes in the Yangtze-Huaihe valley: A multiscale perspective.Atmospheric Environment,244.
MLA	Jia W.,et al."Assessing the pollutant evolution mechanisms of heavy pollution episodes in the Yangtze-Huaihe valley: A multiscale perspective".Atmospheric Environment 244(2021).