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Isotopic Interpretation of Particulate Nitrate in the Metropolitan City of Karachi, Pakistan: Insight into the Oceanic Contribution to NOx

文献类型：期刊论文

作者Zong, Zheng2,3; Tian, Chongguo2,3; Li, Jun4,5; Syed, Jabir Hussain6; Zhang, Wei7; Fang, Yunting8; Jiang, Yifan9; Nasir, Jawad1; Mansha, Muhammad1; Rizvi, Syed Hussain Haider1
刊名ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期2020-07-07
卷号54期号:13页码:7787-7797
ISSN号0013-936X
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.
WOS关键词REGIONAL BACKGROUND SITE ; SOURCE APPORTIONMENT ; MATTER PM2.5 ; ATMOSPHERIC NITRATE ; FORMATION PATHWAYS ; NITROGEN ISOTOPES ; EMISSIONS ; CHINA ; VEHICLE ; SOIL
资助项目Natural Scientific Foundation of China (NSFC)[41977190] ; Natural Scientific Foundation of China (NSFC)[41907198] ; NSFC-Shandong Joint Fund[U1906215] ; Guangdong Foundation for Program of Science and Technology Research[2017B030314057] ; International Partnership Program of Chinese Academy of Sciences[132744KYSB20170002]
WOS研究方向Engineering ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000548584900011
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
源URL[http://ir.yic.ac.cn/handle/133337/28621]  
专题烟台海岸带研究所_近岸生态与环境实验室
烟台海岸带研究所_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.Pakistan Space & Upper Atmosphere Res Commiss SUP, Earth Sci Directorate, Karachi 75270, Pakistan
2.Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Shandong, Peoples R China
3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
5.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Protect, Guangzhou 510640, Peoples R China
6.COMSATS Univ Islamabad CUI, Dept Meteorol, Islamabad 45550, Pakistan
7.Yantai Univ, Sch Environm & Mat Engn, Yantai 264005, Shandong, Peoples R China
8.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110164, Liaoning, Peoples R China
9.Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117575, Singapore
推荐引用方式
GB/T 7714		 Zong, 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.
APA Zong, 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.
MLA Zong, 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.

入库方式： OAI收割

来源：烟台海岸带研究所

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