DOI: 10.1016/j.atmosenv.2020.117329
论文题名: Aerosol vertical profile variations with seasons, air mass movements and local PM2.5 levels in three large China cities
作者: Wang L. ; Lyu B. ; Bai Y.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 224 语种: 英语
英文关键词: Air quality
; Light extinction
; Aerosol extinction coefficient
; Aerosol profiles
; Aerosol vertical profiles
; Backward trajectory
; CALIOP
; Extinction coefficients
; Meteorological condition
; PM2.5
; Atmospheric aerosols
; aerosol
; air mass
; air quality
; atmospheric pollution
; concentration (composition)
; extinction coefficient
; lidar
; public health
; seasonal variation
; urban area
; vertical profile
; aerosol
; air pollution
; altitude
; article
; China
; city
; human
; meteorology
; seasonal variation
; velocity
; China
学科: Aerosol profile
; Backward trajectory
; CALIOP
; PM2.5
中文摘要: High atmospheric aerosol densities in China have significant influence on air quality and human health. It is critical to understand their variations with seasons, air qualities and regional meteorological conditions, not only in the horizontal dimension but also in the vertical dimension. In this study, we discussed aerosol vertical profiles from spaceborne lidar in different seasons, regional air mass movement patterns and ground-level PM2.5 concentrations in three large China cities of Beijing, Shanghai and Guangzhou. The extinction coefficient profiles exhibited apparent seasonal variations due to varied emission and meteorological conditions. Characterized by backward trajectories, the air mass movements, especially the moving speeds and their source regions, have strong impacts on both extinction coefficient values and its relative profile structures. The aerosol extinction coefficient values had positive correlation with ground-level PM2.5 concentrations within the altitude below 700 m, while the relationship in higher altitudes was inapparent. As the altitude increased, the mean extinction coefficient values of high PM2.5 clusters sharply decreased, while the extinction coefficient values of low PM2.5 clusters declined in a linear pattern with a gentle slope. This study provided insightful analysis to understand the vertical distributions of aerosol extinction coefficients under different scenarios, which is helpful for better understanding air pollution episodes. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160932
Appears in Collections: 气候变化与战略
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作者单位: The Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, 100084, China; Joint Center for Global Change Studies, Beijing, 100875, China; Huayun Sounding Meteorology Technology Corporation, Beijing, 100081, China
Recommended Citation:
Wang L.,Lyu B.,Bai Y.. Aerosol vertical profile variations with seasons, air mass movements and local PM2.5 levels in three large China cities[J]. Atmospheric Environment,2020-01-01,224