干旱区生态环境知识资源中心(Arid): Evolution of Aerosols in the Atmospheric Boundary Layer and Elevated Layers during a Severe, Persistent Haze Episode in a Central China Megacity

Arid

DOI	10.3390/atmos12020152
	Evolution of Aerosols in the Atmospheric Boundary Layer and Elevated Layers during a Severe, Persistent Haze Episode in a Central China Megacity
	Zhang, Yunfei; Zhang, Yunpeng; Yu, Changming; Yi, Fan
通讯作者	Zhang, YF (corresponding author), Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R China. ; Zhang, YF (corresponding author), Minist Educ, Key Lab Geospace Environm & Geodesy, Wuhan 430072, Peoples R China. ; Zhang, YF (corresponding author), State Observ Atmospher Remote Sensing, Wuhan 430072, Peoples R China.
来源期刊	ATMOSPHERE
EISSN	2073-4433
出版年	2021
卷号	12 期号:2
英文摘要	Aerosol vertical profiling is crucial to understand the formation mechanism and evolution processes of haze, which have not yet been comprehensively clarified. In this study, we investigated a severe, persistent haze event in Wuhan (30.5 degrees N, 114.4 degrees E), China during 5-18 January 2013 by the use of a polarization lidar, a Cimel sun photometer, meteorological datasets, and the hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) model, focusing on the time-height evolution of aerosols in both the atmospheric boundary layer (ABL) and elevated layers. During the haze period, the integrated particle depolarization ratio was 0.05 +/- 0.02, and the fine mode fraction reached 0.91 +/- 0.03, indicating haze particles were rather spherical and predominately submicron, that is, of anthropogenic nature. Compared with the clear period, columnar aerosol optical depth at 500 nm tripled to 1.32 +/- 0.31, and the strongest enhancement in aerosol concentration occurred from near the ground to an altitude of 1.2 km during the haze period. The daytime evolution of aerosol vertical distribution in the ABL exhibited a distinct pattern under haze weather. Abundant particles accumulated below 0.5 km in the morning hours due to stable meteorological conditions, including a strong surface-based inversion (4.4-8.1 degrees C), late development (from 1000-1100 LT) of the convective boundary layer, and weak wind (<4 m.s(-1)) in the lowermost troposphere. In the afternoon, improved ventilation delivered an overall reduction in boundary layer aerosols but was insufficient to eliminate haze. Particularly, the morning residual layer had an optical depth of 0.29-0.56. It influenced air quality indirectly by weakening convective activities in the morning and directly through the fumigation process around noon, suggesting it may be an important element in aerosol-ABL interactions during consecutive days with haze. Our lidar also captured the presence of the elevated aerosol layers (EALs) embodying regional/long-range transport. Most of the EALs were observed to subside to <1.2 km and exacerbate the pollution level. Backward trajectory analysis and lidar data revealed the EALs originated from the transport of anthropogenic pollutants from the Sichuan Basin, China, and of dust from the deserts in the northwest. They were estimated to contribute similar to 19% of columnar aerosol-loading, pointing to a non-negligible role of transport during the intense pollution episode. The results could benefit the complete understanding of aerosol-ABL interactions under haze weather and air quality forecasting and control in Wuhan.
英文关键词	haze lidar atmospheric boundary layer elevated aerosol layer
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000622137500001
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349606
作者单位	[Zhang, Yunfei; Zhang, Yunpeng; Yu, Changming; Yi, Fan] Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R China; [Zhang, Yunfei; Zhang, Yunpeng; Yu, Changming; Yi, Fan] Minist Educ, Key Lab Geospace Environm & Geodesy, Wuhan 430072, Peoples R China; [Zhang, Yunfei; Zhang, Yunpeng; Yu, Changming; Yi, Fan] State Observ Atmospher Remote Sensing, Wuhan 430072, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yunfei,Zhang, Yunpeng,Yu, Changming,et al. Evolution of Aerosols in the Atmospheric Boundary Layer and Elevated Layers during a Severe, Persistent Haze Episode in a Central China Megacity[J],2021,12(2).
APA	Zhang, Yunfei,Zhang, Yunpeng,Yu, Changming,&Yi, Fan.(2021).Evolution of Aerosols in the Atmospheric Boundary Layer and Elevated Layers during a Severe, Persistent Haze Episode in a Central China Megacity.ATMOSPHERE,12(2).
MLA	Zhang, Yunfei,et al."Evolution of Aerosols in the Atmospheric Boundary Layer and Elevated Layers during a Severe, Persistent Haze Episode in a Central China Megacity".ATMOSPHERE 12.2(2021).