Observation and simulation of HOx radicals in an urban area in Shanghai, China

doi:10.1016/j.scitotenv.2021.152275

	Observation and simulation of HOx radicals in an urban area in Shanghai, China
	Zhang, Guoxian 1,2; Hu, Renzhi 2; Xie, Pinhua 1,2,5,7; Lou, Shengrong 6; Wang, Fengyang 2; Wang, Yihui 2; Qin, Min 2; Li, Xin 4; Liu, Xiaoyan 3; Wang, Yue 2
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2022-03-01
卷号	810
关键词	FAGE-LIF OH and HO2 radicals ROx budget Atmospheric oxidation
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2021.152275
通讯作者	Hu, Renzhi(rzhu@aiofm.ac.cn) ; Xie, Pinhua(phxie@aiofm.ac.cn)
英文摘要	A continuous wintertime observation of ambient OH and HO2 radicals was first carried out in Shanghai, in 2019. This effort coincided with the second China International Import Expo (CIIE), during which strict emission controls were implemented in Shanghai, resulting in an average PM2.5 concentration of less than 35 mu g/m3. The self-developed instrument based on the laser-induced fluorescence (LIF) technique reported that the average OH radical concentration at noontime (11:00-13:00) was 2.7 x 106 cm-3, while the HO2 concentration was 0.8 x 108 cm-3. A chemical box model utilizing the Regional Atmospheric Chemical Mechanism 2 (RACM2), which is used to simulate pollutant reactions and other processes in the troposphere and which incorporates the Leuven isoprene mechanism (LIM1), reproduced the OH concentrations on most days. The HO2 concentration was underestimated, and the observed-tomodelled ratio demonstrated poor performance by the model, especially during the elevated photochemistry period. Missing primary peroxy radical sources or unknown behaviors of RO2 for high-NOx regimes are possible reasons for the discrepancy. The daytime ROx production was controlled by various sources. HONO photolysis accounted for more than one half (0.83 ppb/h), and the contribution from formaldehyde, OVOCs and ozone photolysis was relatively similar. Active oxidation paths accelerated the rapid ozone increase in winter. The average ozone production rate was 15.1 ppb/h, which is comparable to that of a Beijing suburb (10 ppb/h for the 'BEST-ONE') but much lower than that of Beijing's center (39 ppb/h in 'PKU' and 71 ppb/h in 'APHH') in wintertime. Cumulative local ozone based on observed peroxy radicals was five times higher than the value simulated by the current model due to the underprediction of HO2 and RO2 under the high-NOx regime. This analysis provides crucial information for subsequent pollution control pol- icies in Shanghai.
资助项目	National Natural Science Foundation of China[U19A2044] ; National Natural Science Foundation of China[61905003] ; National Natural Science Foundation of China[91644107] ; Cultivating Project of Strategic Priority Research Program of Chinese Academy of Sciences[XDPB1901] ; Natural Science Foundation of Anhui Province[2008085J20] ; National Key R&D Program of China[2017YFC0209401]
WOS关键词	ATMOSPHERIC OXIDATION CAPACITY ; HAZE EVENTS ; OH ; CHEMISTRY ; AIR ; PHOTOCHEMISTRY ; INTERFERENCES ; WINTERTIME ; MECHANISM ; POLLUTION
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000740225200010
资助机构	National Natural Science Foundation of China ; Cultivating Project of Strategic Priority Research Program of Chinese Academy of Sciences ; Natural Science Foundation of Anhui Province ; National Key R&D Program of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/127261]
专题	中国科学院合肥物质科学研究院
通讯作者	Hu, Renzhi; Xie, Pinhua
作者单位	1.Univ Sci & Technol China, Hefei, Peoples R China 2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, HFIPS, Hefei, Peoples R China 3.Anhui Med Univ, Coll Pharm, Hefei, Peoples R China 4.Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing, Peoples R China 5.Chinese Acad Sci, CAS Ctr Excellence Urban Atmospher Environm, Inst Urban Environm, Xiamen, Peoples R China 6.Shanghai Acad Environm Sci, State Environm Protect Key Lab Format & Prevent U, Shanghai, Peoples R China 7.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Guoxian,Hu, Renzhi,Xie, Pinhua,et al. Observation and simulation of HOx radicals in an urban area in Shanghai, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,810.
APA	Zhang, Guoxian.,Hu, Renzhi.,Xie, Pinhua.,Lou, Shengrong.,Wang, Fengyang.,...&Liu, Wenqing.(2022).Observation and simulation of HOx radicals in an urban area in Shanghai, China.SCIENCE OF THE TOTAL ENVIRONMENT,810.
MLA	Zhang, Guoxian,et al."Observation and simulation of HOx radicals in an urban area in Shanghai, China".SCIENCE OF THE TOTAL ENVIRONMENT 810(2022).