Vertical profiles of the transport fluxes of aerosol and its precursors between Beijing and its southwest cities

doi:10.1016/j.envpol.2022.119988

	Vertical profiles of the transport fluxes of aerosol and its precursors between Beijing and its southwest cities
	Hu, Qihou 2; Liu, Cheng 2,3,4,7; Li, Qihua 5; Liu, Ting 6; Ji, Xiangguang 2; Zhu, Yizhi 2; Xing, Chengzhi 2; Liu, Haoran 5; Tan, Wei 2; Gao, Meng 1
刊名	ENVIRONMENTAL POLLUTION
	2022-11-01
卷号	312
关键词	Aerosol Gaseous pollutant Regional transport Vertical profile Flux
ISSN号	0269-7491
DOI	10.1016/j.envpol.2022.119988
通讯作者	Liu, Cheng(chliu81@ustc.edu.cn)
英文摘要	The influence of regional transport on aerosol pollution has been explored in previous studies based on numerical simulation or surface observation. Nevertheless, owing to inhomogeneous vertical distribution of air pollutants, vertical observations should be conducted for a comprehensive understanding of regional transport. Here we obtained the vertical profiles of aerosol and its precursors using ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) at the Nancheng site in suburban Beijing on the southwest transport pathway of the Beijing-Tianjin-Hebei (BTH) region, China, and then estimated the vertical profiles of transport fluxes in the southwest-northeast direction. The maximum net transport fluxes per unit cross-sectional area, calculated as pollutant concentration multiply by wind speed, of aerosol extinction coefficient (AEC), NO2, SO2 and HCHO were 0.98 km(-1) m s(-1), 24, 14 and 8.0 mu g m(-2) s(-1) from southwest to northeast, which occurred in the 200-300 m, 100-200 m, 500-600 m and 500-600 m layers, respectively, due to much higher pollutant concentrations during southwest transport than during northeast transport in these layers. The average net column transport fluxes were 1200 km(-1 )m(2) s(-1), 38, 26 and 15 mg m(-1) s(-1) from southwest to northeast for AEC, NO2, SO2 and HCHO, respectively, in which the fluxes in the surface layer (0-100 m) accounted for only 2.3%-4.2%. Evaluation only based on surface observation would underestimate the influence of the transport from southwest cities to Beijing. Northeast or weak southwest transports dominated in clean conditions with PM2.5 <75 mu g m(-3) and intense southwest transport dominated in polluted conditions with PM2.5 >75 mu g m(-3). Southwest transport through the middle boundary layer was a trigger factor for aerosol pollution events in urban Beijing, because it not only directly bringing air pollutants, but also induced an inverse structure of aerosols, which resulted in stronger atmospheric stability and aggravated air pollution in urban Beijing.
资助项目	National Natural Science Foundation of China[41977184] ; National Natural Science Foundation of China[U21A2027] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23020301] ; Key Research and Development Project of Anhui Province[202104i07020002] ; Major Projects of High Resolution Earth Observation Systems of National Science and Technology[05-Y30B01-9001-19/20-3] ; Youth Innovation Promotion Association of CAS[2021443] ; Young Talent Project of the Center for Excel-lence in Regional Atmospheric Environment, CAS[CERAE202004] ; Cultivating Project of Strategic Priority Research Program of Chinese Academy of Sciences[XDPB1901]
WOS关键词	MAX-DOAS OBSERVATIONS ; HEAVY POLLUTION EPISODES ; REGIONAL TRANSPORT ; BOUNDARY-LAYER ; PARTICULATE MATTER ; AIR-POLLUTION ; CLEAN-AIR ; CHINA ; HAZE ; DISTRIBUTIONS
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000864074000007
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research and Development Project of Anhui Province ; Major Projects of High Resolution Earth Observation Systems of National Science and Technology ; Youth Innovation Promotion Association of CAS ; Young Talent Project of the Center for Excel-lence in Regional Atmospheric Environment, CAS ; Cultivating Project of Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/129472]
专题	中国科学院合肥物质科学研究院
通讯作者	Liu, Cheng
作者单位	1.Hong Kong Baptist Univ, Dept Geog, State Key Lab Environm & Biol Anal, Hong Kong, Peoples R China 2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Hefei Inst Phys Sci, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China 3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China 4.Univ Sci & Technol China, Anhui Higher Educ Inst, Key Lab Precis Sci Instrumentat, Hefei 230026, Peoples R China 5.Anhui Univ, Inst Phys Sci & Informat Technol, Hefei, Peoples R China 6.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China 7.Univ Sci & Technol China, Dept Precis Machinery & Precis Instrumentat, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Hu, Qihou,Liu, Cheng,Li, Qihua,et al. Vertical profiles of the transport fluxes of aerosol and its precursors between Beijing and its southwest cities[J]. ENVIRONMENTAL POLLUTION,2022,312.
APA	Hu, Qihou.,Liu, Cheng.,Li, Qihua.,Liu, Ting.,Ji, Xiangguang.,...&Gao, Meng.(2022).Vertical profiles of the transport fluxes of aerosol and its precursors between Beijing and its southwest cities.ENVIRONMENTAL POLLUTION,312.
MLA	Hu, Qihou,et al."Vertical profiles of the transport fluxes of aerosol and its precursors between Beijing and its southwest cities".ENVIRONMENTAL POLLUTION 312(2022).