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

doi:10.1021/acs.est.0c00490

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 中科院海岸带环境过程与生态修复重点实验室 > 近岸生态与环境实验室

	Isotopic Interpretation of Particulate Nitrate in the Metropolitan City of Karachi, Pakistan: Insight into the Oceanic Contribution to NOx
	Zong, Zheng 6,8; Tian, Chongguo 6,8; Li, Jun 5,7; Syed, Jabir Hussain 9; Zhang, Wei 4; Fang, Yunting 1; Jiang, Yifan 3; Nasir, Jawad 2; Mansha, Muhammad 2; Rizvi, Syed Hussain Haider 2
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2020-07-07
卷号	54 期号:13 页码:7787-7797
ISSN号	0013-936X
DOI	10.1021/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关键词	REGIONAL BACKGROUND SITE ; SOURCE APPORTIONMENT ; MATTER PM2.5 ; ATMOSPHERIC NITRATE ; FORMATION PATHWAYS ; NITROGEN ISOTOPES ; EMISSIONS ; CHINA ; VEHICLE ; SOIL
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
内容类型	期刊论文
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.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang 110164, Liaoning, Peoples R China 2.Pakistan Space & Upper Atmosphere Res Commiss SUP, Earth Sci Directorate, Karachi 75270, Pakistan 3.Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117575, Singapore 4.Yantai Univ, Sch Environm & Mat Engn, Yantai 264005, Shandong, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Protect, Guangzhou 510640, Peoples R China 6.Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Shandong, Peoples R China 7.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 8.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 9.COMSATS Univ Islamabad CUI, Dept Meteorol, Islamabad 45550, Pakistan
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.