Zong, Zheng1,2; Tian, Chongguo1,2
; Li, Jun3,4; Syed, Jabir Hussain5; Zhang, Wei6; Fang, Yunting7; Jiang, Yifan8; Nasir, Jawad9; Mansha, Muhammad9; Rizvi, Syed Hussain Haider9; Shafiq, Muhammad9; Bin Farhan, Suhaib9; Zhang, Gan3,4发表期刊ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
2020-07-07
卷号54期号:13页码:7787-7797
DOI10.1021/acs.est.0c00490
通讯作者Tian, Chongguo(cgtian@yic.ac.cn); Li, Jun(junli@gig.ac.cn)
英文摘要Nitrogen oxide (NOx) abatement has become the focus of air quality management strategies. In this study, we examined NOx sources and the atmospheric conversion of NOx in Karachi, Pakistan, a megacity in South Asia with serious particulate pollution problems. Oceanic contributions to NOx were quantified for the first time based on a novel approach using nitrogen/oxygen isotopic analysis in nitrate (delta N-15-NO3-; delta O-18-NO3-) and a Bayesian model. Our results showed that delta N-15-NO3- in Karachi varied between -10.2 parts per thousand and +12.4 parts per thousand. As indicated by the delta O-18-NO3- findings (+66.2 +/- 7.8 parts per thousand), the center dot OH pathway dominated NOx conversion throughout the nearly two-year observation, but high NO3- events were attributed to the O-3 pathway. Coal combustion was the most significant source (32.0 +/- 9.8%) of NOx in Karachi, with higher contributions in the autumn and winter; a similar situation occurred for biomass burning + lightning (30.3 +/- 6.5%). However, mobile sources (25.2 +/- 6.4%) and microbial processes (12.5 +/- 7.5%) exhibited opposite seasonal trends. The oceanic contributions to NOx in Karachi were estimated to be 16.8%, of which lightning, shipping emissions, and microbial processes accounted for 20.3%, 46.3%, and 33.4%, respectively, emphasizing the dominance of shipping emissions as an oceanic NOx source.
资助机构Natural Scientific Foundation of China (NSFC); NSFC-Shandong Joint Fund; Guangdong Foundation for Program of Science and Technology Research; International Partnership Program of Chinese Academy of Sciences
收录类别SCI
语种英语
关键词[WOS]REGIONAL BACKGROUND SITE; SOURCE APPORTIONMENT; MATTER PM2.5; ATMOSPHERIC NITRATE; FORMATION PATHWAYS; NITROGEN ISOTOPES; EMISSIONS; CHINA; VEHICLE; SOIL
研究领域[WOS]Engineering; Environmental Sciences & Ecology
WOS记录号WOS:000548584900011
引用统计被引频次：5[WOS][WOS记录][WOS相关记录]
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/28622
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
中科院海岸带环境过程与生态修复重点实验室
通讯作者Tian, Chongguo; Li, Jun作者单位1.Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Shandong, Peoples R China
2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Protect, Guangzhou 510640, Peoples R China
5.COMSATS Univ Islamabad CUI, Dept Meteorol, Islamabad 45550, Pakistan
6.Yantai Univ, Sch Environm & Mat Engn, Yantai 264005, Shandong, Peoples R China
7.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110164, Liaoning, Peoples R China
8.Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117575, Singapore
9.Pakistan Space & Upper Atmosphere Res Commiss SUP, Earth Sci Directorate, Karachi 75270, Pakistan
推荐引用方式
GB/T 7714Zong, Zheng,Tian, Chongguo,Li, Jun,et al. Isotopic Interpretation of Particulate Nitrate in the Metropolitan City of Karachi, Pakistan: Insight into the Oceanic Contribution to NOx[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(13):7787-7797.
APAZong, Zheng.,Tian, Chongguo.,Li, Jun.,Syed, Jabir Hussain.,Zhang, Wei.,...&Zhang, Gan.(2020).Isotopic Interpretation of Particulate Nitrate in the Metropolitan City of Karachi, Pakistan: Insight into the Oceanic Contribution to NOx.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(13),7787-7797.
MLAZong, Zheng,et al."Isotopic Interpretation of Particulate Nitrate in the Metropolitan City of Karachi, Pakistan: Insight into the Oceanic Contribution to NOx".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.13(2020):7787-7797.
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