气候变化领域集成服务门户(CCPortal): Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution

CCPortal

DOI	10.5194/acp-20-14917-2020
	Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution
	Wang Z.; Liu C.; Xie Z.; Hu Q.; Andreae M.O.; Dong Y.; Zhao C.; Liu T.; Zhu Y.; Liu H.; Xing C.; Tan W.; Ji X.; Lin J.; Liu J.
发表日期	2020
ISSN	1680-7316
起始页码	14917
结束页码	14932
卷号	20 期号:23
英文摘要	Persistent wintertime heavy haze incidents caused by anthropogenic aerosols have repeatedly shrouded North China in recent years, while natural dust from the west and northwest of China also frequently affects air quality in this region. Through continuous observation by a multi-wavelength Raman lidar, here we found that wintertime aerosols in North China are typically characterized by a pronounced vertical stratification, where scattering nonspherical particles (dust or mixtures of dust and anthropogenic aerosols) dominated above the planetary boundary layer (PBL), and absorbing spherical particles (anthropogenic aerosols) prevailed within the PBL. This stratification is governed by meteorological conditions that strong northwesterly winds usually prevailed in the lower free troposphere, and southerly winds dominated in the PBL, producing persistent and intense haze pollution. With the increased contribution of elevated dust to the upper aerosols, the proportion of aerosol and trace gas at the surface in the whole column increased. Model results show that, besides directly deteriorating air quality, the key role of the elevated dust is to depress the development of PBL and weaken the turbulent exchange, mostly by lower level cooling and upper level heating, and it is more obvious during the dissipation stage, thus inhibiting the dissipation of heavy surface anthropogenic aerosols. The interactions of natural dust and anthropogenic aerosols under the unique topography of North China increase the surface anthropogenic aerosols and precursor gases, which may be one of the reasons why haze pol-lution in North China is heavier than that in other heavily polluted areas in China. © 2020 BMJ Publishing Group. All rights reserved.
英文关键词	aerosol; air quality; anthropogenic source; atmospheric pollution; boundary layer; dust; haze; China
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168919
作者单位	Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China; Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, 230026, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230026, China; Anhui Province Key Laboratory of Polar Environment and Global Change, University of Science and Technology of China, Hefei, 230026, China; Max Planck Institute for Chemist...
推荐引用方式 GB/T 7714	Wang Z.,Liu C.,Xie Z.,et al. Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution[J],2020,20(23).
APA	Wang Z..,Liu C..,Xie Z..,Hu Q..,Andreae M.O..,...&Liu J..(2020).Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution.Atmospheric Chemistry and Physics,20(23).
MLA	Wang Z.,et al."Elevated dust layers inhibit dissipation of heavy anthropogenic surface air pollution".Atmospheric Chemistry and Physics 20.23(2020).