| Isotopic Interpretation of Particulate Nitrate in the Metropolitan City of Karachi, Pakistan: Insight into the Oceanic Contribution to NOx | |
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
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| 发表期刊 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
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| ISSN | 0013-936X |
| 2020-07-07 | |
| 卷号 | 54期号:13页码:7787-7797 |
| 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 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.yic.ac.cn/handle/133337/28622 |
| 专题 | 中国科学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 中国科学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 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. |
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