Su, Tao1,4; Li, Jun1; Zhang, Gan1; Tian, Chongguo2
; Zong, Zheng2; Chen, Duohong3发表期刊ATMOSPHERIC ENVIRONMENT
ISSN1352-2310
2020-06-15
卷号231页码:117563
关键词Pearl River DeltaNitrateIsotopeSource apportionment
DOI10.1016/j.atmosenv.2020.117563
英文摘要NOx is an important precursor of fine particulate matter (PM2.5) and O-3 and its oxidation product NO3- may be the main driver of PM2.5. In this study, 76 daily fine particle samples were collected from a site in South China, and the characteristics of NO3- were studied using an improved Bayesian mixing model based on delta N-15-delta O-18 compositions and online trace gas analysis. NO3- concentrations ranged from 0.60 to 21.7 mu g/m(3), accounting for 6.0 +/- 3.3% of total PM2.5 on average. delta N-15-NO3- values varied from -3.6 to 15.4 parts per thousand (average: 7.5 +/- 3.3 parts per thousand). Driven by changes in chemical pathways and environmental parameters, including equilibrium fractionation and thermodynamic effects, delta N-15-NO3- values were lowest in spring and highest in winter. delta O-18-NO3- values varied from 21.0 to 90.1 parts per thousand (average: 62.4 +/- 14.0 parts per thousand). In spring, the lowest delta O-18-NO(3)(-)values were observed due to high proportions originating from center dot HO2 and center dot OH reaction pathways, as well as changes in other parameters. In winter, the highest delta O-18-NO3- values were observed due to cold and dry weather, along with the lowest proportion from the center dot OH pathway. Moreover, the trace gases CO, O-3, NOx, SO2, and N2O5 were measured seasonally to determine the main drivers of seasonality in delta N-15-delta O-18 composition. Monte Carlo simulation was used to estimate the relative contributions of the gas-phase reactions of NO2 and center dot OH radicals and the hydrolysis of N2O5. The results showed that the center dot OH generation pathway was predominant throughout the year, with relative contributions of 72 +/- 18%, 76 +/- 16%, 63 +/- 17% and 39 +/- 15% in spring, summer, fall and winter, respectively. Coal combustion (50.1 +/- 13.8%) was the predominant source of NO3- identified using the Bayesian model, and originated from central and southern Guangdong Province, as indicated by potential source contribution function analysis.
资助机构Natural Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC) [41977177]; National Key R&D Program of China [2017YFC0212000]; Guangdong Foundation for Program of Science and Technology Research [2017B030314057]
收录类别SCI
语种英语
关键词[WOS]PEARL RIVER DELTA; REGIONAL BACKGROUND SITE; SOURCE APPORTIONMENT; THEORETICAL CALCULATION; CHEMICAL-COMPOSITIONS; FRACTIONATION FACTORS; NITROUS-OXIDE; NOX EMISSIONS; PM2.5; CHEMISTRY
研究领域[WOS]Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
WOS记录号WOS:000541247800022
引用统计被引频次：3[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/133337/30478
专题中科院海岸带环境过程与生态修复重点实验室
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China;
2.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China;
3.Guangdong Environm Monitoring Ctr, Guangzhou 510308, Peoples R China;
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714Su, Tao,Li, Jun,Zhang, Gan,et al. Source and formation of fine particulate nitrate in South China: Constrained by isotopic modeling and online trace gas analysis[J]. ATMOSPHERIC ENVIRONMENT,2020,231:117563.
APASu, Tao,Li, Jun,Zhang, Gan,Tian, Chongguo,Zong, Zheng,&Chen, Duohong.(2020).Source and formation of fine particulate nitrate in South China: Constrained by isotopic modeling and online trace gas analysis.ATMOSPHERIC ENVIRONMENT,231,117563.
MLASu, Tao,et al."Source and formation of fine particulate nitrate in South China: Constrained by isotopic modeling and online trace gas analysis".ATMOSPHERIC ENVIRONMENT 231(2020):117563.
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