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DOI	10.5194/acp-23-2379-2023
	Elucidate the formation mechanism of particulate nitrate based on direct radical observations in the Yangtze River Delta summer 2019
	Zhai, Tianyu; Lu, Keding; Wang, Haichao; Lou, Shengrong; Chen, Xiaorui; Hu, Renzhi; Zhang, Yuanhang
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2379
结束页码	2391
卷号	23 期号:4 页码:13
英文摘要	Particulate nitrate (NO3-) is one of the dominant components of fine particles in China, especially during pollution episodes, and has a significant impact on human health, air quality, and climate. Here a comprehensive field campaign that focuses on the atmospheric oxidation capacity and aerosol formation and their effects in the Yangtze River Delta (YRD) was conducted from May to June 2019 at a regional site in Changzhou, Jiangsu Province in China. The concentrations of NO3- , OH radicals, N2O5, NO2, O-3, and relevant parameters were measured simultaneously. We showed a high NO3- mass concentration with 10.6 +/- 8.9 mu g m(-3) on average, which accounted for 38.3 % of total water-soluble particulate components and 32.0 % of total PM2.5, followed by the proportion of sulfate, ammonium, and chloride by 26.0 %, 18.0 %, and 2.0 %, respectively. This result confirmed that the heavy nitrate pollution in eastern China happened not only in winter, but also in summer. This study's high nitrate oxidation ratio (NOR) emphasized the solid atmospheric oxidation and fast nitrate forma-tion capacity in the YRD. It was found that OH + NO2 during daytime dominated nitrate formation on clean days, while N2O5 hydrolysis vastly enhanced and became comparable with that of OH + NO2 during polluted days (67.2 % and 30.2 %, respectively). The updated observed-constraint Empirical Kinetic Modeling Approach (EKMA) was used to assess the kinetic controlling factors of both local O(3 )and NO3- productions, which indicated that the O-3-targeted scheme (VOCs : NOx = 2 : 1) is adequate for mitigating the O-3 and nitrate pollution coordinately during summertime in this region. Our results promote the understanding of nitrate pollution mechanisms and mitigation based on field observation and model simulation and call for more attention to nitrate pollution in the summertime.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000936839400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273600
作者单位	Nanjing University of Information Science & Technology; Sun Yat Sen University; Chinese Academy of Sciences; Hong Kong Polytechnic University
推荐引用方式 GB/T 7714	Zhai, Tianyu,Lu, Keding,Wang, Haichao,et al. Elucidate the formation mechanism of particulate nitrate based on direct radical observations in the Yangtze River Delta summer 2019[J],2023,23(4):13.
APA	Zhai, Tianyu.,Lu, Keding.,Wang, Haichao.,Lou, Shengrong.,Chen, Xiaorui.,...&Zhang, Yuanhang.(2023).Elucidate the formation mechanism of particulate nitrate based on direct radical observations in the Yangtze River Delta summer 2019.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(4),13.
MLA	Zhai, Tianyu,et al."Elucidate the formation mechanism of particulate nitrate based on direct radical observations in the Yangtze River Delta summer 2019".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.4(2023):13.