Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-17177-2018 |
Two years of online measurement of fine particulate nitrate in the western Yangtze River Delta: influences of thermodynamics and N2O5 hydrolysis | |
Sun, Peng1; Nie, Wei1,2; Chi, Xuguang1,2; Xie, Yuning1; Huang, Xin1,2; Xu, Zheng1,2; Qi, Ximeng1,2; Xu, Zhengning1; Wang, Lei1; Wang, Tianyi1; Zhang, Qi3; Ding, Aijun1,2 | |
2018-12-05 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:23页码:17177-17190 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Particulate nitrate contributes a large fraction of secondary aerosols. Despite understanding of its important role in regional air quality and global climate, long-term continuous measurements are rather limited in China. In this study, we conducted online measurement of PM2.5 (particulate matter with diameters less than 2.5 mu m) nitrate for 2 years from March 2014 to February 2016 using the Monitor for AeRosols and Gases in ambient Air (MARGA) in the western Yangtze River Delta (YRD), eastern China, and investigate the main factors that influenced its temporal variations and formation pathways. Compared to other sites in China, an overall high concentration of particulate nitrate was observed, with a mean value of 15.8 mu g m(-3) (0.5 to 92.6 mu g m(-3)). Nitrate on average accounted for 32 % of the total mass of water-soluble ions and the proportion increased with PM loading, indicating that nitrate is a major driver of haze pollution episodes in this region. Sufficient ammonia drove most nitrate into the particle phase in the form of ammonium nitrate. A typical seasonal cycle of nitrate was observed, with the concentrations in winter on average 2 times higher than those in summer mainly due to different meteorological conditions. In summer, the diurnal variation of particulate nitrate was determined by thermodynamic equilibrium, resulting in a much lower concentration during daytime despite a considerable photochemical production. Air masses from the polluted YRD and biomass burning region contributed to the high nitrate concentration during summer. In winter, particulate nitrate did not reveal an evident diurnal variation. Regional transport from northern China played an important role in enhancing nitrate concentration. A total of 18 nitrate episodes were selected to understand the processes that drive the formation of high concentration of nitrate. Rapid nitrate formation was observed during the pre-episode (the day before nitrate episode day) nights, and dominated the increase of total water-soluble ions. Calculated nitrate from N2O5 hydrolysis was highly correlated to and accounted for 80 % of the observed nitrate, suggesting that N2O5 hydrolysis was a major contributor to the nitrate episodes. Our results suggested that rapid formation of nitrate could be a main cause for extreme aerosol pollution events in the YRD during winter, and illustrated the urgent need to control NOx emission. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000452160300003 |
WOS关键词 | NORTH CHINA PLAIN ; CHEMICAL-COMPOSITION ; AEROSOL CHEMISTRY ; SIZE-DISTRIBUTION ; POLLUTION EVENTS ; HAZE POLLUTION ; AIR-QUALITY ; RURAL SITE ; HONG-KONG ; EVOLUTION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/30888 |
专题 | 地球科学 |
作者单位 | 1.Nanjing Univ, Sch Atmospher Sci, Joint Int Res Lab Atmospher & Earth Syst Sci, Nanjing 210023, Jiangsu, Peoples R China; 2.Jiangsu Prov Collaborat Innovat Ctr Climate Chang, Nanjing 210023, Jiangsu, Peoples R China; 3.Univ Calif Davis, Dept Environm Toxicol, Davis, CA 95616 USA |
推荐引用方式 GB/T 7714 | Sun, Peng,Nie, Wei,Chi, Xuguang,et al. Two years of online measurement of fine particulate nitrate in the western Yangtze River Delta: influences of thermodynamics and N2O5 hydrolysis[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(23):17177-17190. |
APA | Sun, Peng.,Nie, Wei.,Chi, Xuguang.,Xie, Yuning.,Huang, Xin.,...&Ding, Aijun.(2018).Two years of online measurement of fine particulate nitrate in the western Yangtze River Delta: influences of thermodynamics and N2O5 hydrolysis.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(23),17177-17190. |
MLA | Sun, Peng,et al."Two years of online measurement of fine particulate nitrate in the western Yangtze River Delta: influences of thermodynamics and N2O5 hydrolysis".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.23(2018):17177-17190. |
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