气候变化领域集成服务门户(CCPortal): Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an

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DOI	10.1016/j.atmosenv.2021.118215
	Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an
	Huige D.; Siwen L.; Yun Y.; Dengxin H.; jianyu W.
发表日期	2021
ISSN	1352-2310
卷号	247
英文摘要	To understand the characteristics of atmospheric pollution in Xi'an, China, the vertical structure of aerosols and meteorological data (temperature and relative humidity) during atmospheric pollution processes were obtained and studied. Lidar and radiosonde data were used for analyses of atmospheric pollution. Polarization lidar was used to study the vertical distribution and optical properties of aerosols during haze and dust processes that occurred in 2015–2016. The planetary boundary layer height (PBLH) and types of aerosol particles were retrieved from polarization lidar. A case study shows that a low PBLH and complex vertical distributions of aerosols, temperature and relative humidity (RH) were the main structural characteristics of haze days. The backscatter coefficient exceeded 0.015 km−1·Sr−1, while the linear particle depolarization ratio was relatively small. A large depolarization ratio above the haze layer, which induces the existence of floating dust, was observed by polarization lidar. Compared with those of haze processes, the vertical aerosol and temperature distributions of dust processes were different. Statistical analyses of the PBLH, temperature inversion, RH and near-surface aerosol concentration were also presented. A lower PBLH, lower average lapse rate of temperature within the PBL, and higher RH were found when haze pollution occurred. An inversion at the top of the boundary layer aggravates ground pollution, while there is not always a temperature inversion when haze occurs in Xi'an. Together, a lower PBLH and lower average lapse rate of temperature weaken the vertical diffusion of pollutants. Decreased vertical diffusion should be the main reason for the formation and persistence of pollution in Xi'an. Increased RH was the catalyst for haze pollution. The aggravation of haze was usually accompanied by an increase in RH, and the decline of haze processes was also accompanied by a decrease or increase (>90%) in RH. © 2021 Elsevier Ltd
关键词	Aerosol Meteorological factors Polarization lidar Pollution
语种	英语
scopus关键词	Aerosols; Atmospheric humidity; Atmospheric structure; Atmospheric temperature; Boundary layer flow; Boundary layers; Climatology; Depolarization; Dust; Optical properties; Optical radar; Particles (particulate matter); Polarization; Backscatter coefficients; Meteorological factors; Optical properties of aerosols; Planetary boundary layers; Structural characteristics; Temperature and relative humidity; Temperature inversions; Vertical distributions; Air pollution; aerosol; aerosol formation; atmospheric pollution; boundary layer; dust; haze; meteorology; observational method; particulate matter; spatiotemporal analysis; vertical distribution; aerosol; article; boundary layer; catalyst; depolarization; diffusion; haze; humidity; observational study; polarization; pollutant; China; Shaanxi; Xian
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/248595
作者单位	School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an, 710048, China; Key Laboratory of Active Opto-Electronics Technology, Chinese Academy of Sciences, Shanghai, 200083, China
推荐引用方式 GB/T 7714	Huige D.,Siwen L.,Yun Y.,et al. Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an[J],2021,247.
APA	Huige D.,Siwen L.,Yun Y.,Dengxin H.,&jianyu W..(2021).Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an.ATMOSPHERIC ENVIRONMENT,247.
MLA	Huige D.,et al."Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an".ATMOSPHERIC ENVIRONMENT 247(2021).