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  4. 中科院安徽光学精密机械研究所
On the summertime air quality and related photochemical processes in the megacity Shanghai, China

文献类型：期刊论文

作者Chan, Ka Lok1,2; Wang, Shanshan1,3,6; Liu, Cheng4,5,6; Zhou, Bin1; Wenig, Mark O.2; Saiz-Lopez, Alfonso1,3
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2017-02-15
卷号580期号:无页码:974-983
关键词Hono Pm2.5 O-3 Photochemistry Doas
DOI10.1016/j.scitotenv.2016.12.052
文献子类Article
英文摘要Summertime surface ozone (O-3) and related secondary formation of fine particles are the major air quality concerns in the megacity of Shanghai. We performed mobile Cavity Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) measurements to investigate the spatial distribution of on-road nitrogen dioxide (NO2) concentrations along the Inner Ring Elevated Road (IRER) in Shanghai. The observations show a ratio of 4 between CE-DOAS averaged on -road NO2 and the in -situ ambient measurements, illustrating the strong impact of vehicle emissions over the urban area. The air mass transport analysis suggests that the observed episodic ozone events arise from both the abundance of volatile organic compounds (VOCs) precursors in the sampled plume and the regional transport of ozone-rich air masses. Analysis of the sources of PM2.5 shows that the secondary heterogeneous gas-to-particle conversion of sulfate and nitrate from sulfur dioxide (SO2) and nitrogen oxides (N0x) is the largest source of PM25 contributing 44.8 +/- 9.2% of the total PM2.5. Ozone-related photochemical formation of fine particles is estimated to contribute about 22.5 +/- 11.9% of the total PM25, which is strongly facilitated by solar radiation in summer. According to our results, nitrous acid (HONO) is the major precursor of hydroxyl radicals (OH) accounting for 40% to 80% of the total OH production during daytime. A significant correlation is found between the HONO levels in the early morning and the daily 03 and PM2.5 levels. The summertime measurements indicate that the photolytic reaction of HONO after sunrise increased the abundance of daytime OH and oxidative capacity, resulting in an enhancement of ground level ozone and secondary organic aerosol formation. This study provides quantitative information to better understand photochemical formation of ozone and fine particles in Shanghai during summertime, which is useful for designing collaborative strategies to mitigate emissions of precursor pollutants. (C) 2016 Published by Elsevier B.V.
WOS关键词ABSORPTION CROSS-SECTIONS ; PEARL RIVER DELTA ; TEMPERATURE-DEPENDENCE ; EMISSION INVENTORY ; NM REGION ; OZONE ; POLLUTION ; AEROSOL ; MODEL ; OH
WOS研究方向Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000395353600096
资助机构National Natural Science Foundation of China(41405117 ; National Natural Science Foundation of China(41405117 ; National Natural Science Foundation of China(41405117 ; National Natural Science Foundation of China(41405117 ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; 21477021) ; 21477021) ; 21477021) ; 21477021) ; National Natural Science Foundation of China(41405117 ; National Natural Science Foundation of China(41405117 ; National Natural Science Foundation of China(41405117 ; National Natural Science Foundation of China(41405117 ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Project of Key Laboratory in Environmental Optics & Technology of Chinese Academy of Sciences(2005DP173065-2014-02) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; Marie Curie Initial Training Network of the European Seventh Framework Programme(607905) ; 21477021) ; 21477021) ; 21477021) ; 21477021)
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/31757]  
专题合肥物质科学研究院_中科院安徽光学精密机械研究所
作者单位1.Fudan Univ, Shanghai Key Lab Atmospher Particle Pollut & Prev, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China
2.Ludwig Maximilians Univ Munchen, Inst Meteorol, D-80333 Munich, Germany
3.CSIC, Dept Atmospher Chem & Climate, Inst Phys Chem Rocasolano, E-28006 Madrid, Spain
4.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Urban Atmospher Environm, Inst Urban Environm, Xiamen 361021, Peoples R China
6.Chinese Acad Sci, Key Lab Environm Opt & Technol, Anhui Inst Opt & Fine Mech, Hefei 230031, Peoples R China
推荐引用方式
GB/T 7714		 Chan, Ka Lok,Wang, Shanshan,Liu, Cheng,et al. On the summertime air quality and related photochemical processes in the megacity Shanghai, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,580(无):974-983.
APA Chan, Ka Lok,Wang, Shanshan,Liu, Cheng,Zhou, Bin,Wenig, Mark O.,&Saiz-Lopez, Alfonso.(2017).On the summertime air quality and related photochemical processes in the megacity Shanghai, China.SCIENCE OF THE TOTAL ENVIRONMENT,580(无),974-983.
MLA Chan, Ka Lok,et al."On the summertime air quality and related photochemical processes in the megacity Shanghai, China".SCIENCE OF THE TOTAL ENVIRONMENT 580.无(2017):974-983.

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来源：合肥物质科学研究院

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