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J Environ Sci (China)

Title:		Nocturnal atmospheric chemistry of NO(3) and N(2)O(5) over Changzhou in the Yangtze River Delta in China
Author(s):		Lin C; Hu R; Xie P; Lou S; Zhang G; Tong J; Liu J; Liu W;
Address:		"Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, China. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China. Electronic address: rzhu@aiofm.ac.cn. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361000, China. Electronic address: phxie@aiofm.ac.cn. State Environmental Protection Key Laboratory of the Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China. University of Science and Technology of China, Hefei 230026, China"
Journal Title:		J Environ Sci (China)
Year:		2022
Volume:		20220220
Issue:
Page Number:		376 - 390
DOI:		10.1016/j.jes.2021.09.016
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"Comprehensive observations of the nocturnal atmospheric oxidation of NO(3) and N(2)O(5) were conducted at a suburban site in Changzhou in the YRD using cavity ring-down spectroscopy (CRDS) from 27 May to 24 June, 2019. High concentrations of NO(3) precursors were observed, and the nocturnal production rate of NO(3) was determined to be 1.7 +/- 1.2 ppbv/hr. However, the nighttime NO(3) and N(2)O(5) concentrations were relatively low, with maximum values of 17.7 and 304.7 pptv, respectively, illustrating the rapid loss of NO(3) and N(2)O(5). It was found that NO(3) dominated the nighttime atmospheric oxidation, accounting for 50.7%, while O(3) and OH only contributed 34.1% and 15.2%, respectively. For the reactions of NO(3) with volatile organic compounds (VOCs), styrene was found to account for 60.3%, highlighting its dominant role in the NO(3) reactivity. In general, the contributions of the reactions between NO(3) and VOCs and the N(2)O(5) uptake to NO(3) loss were found to be about 39.5% and 60.5%, respectively, indicating that N(2)O(5) uptake also played an important role in the loss of NO(3) and N(2)O(5), especially under the high humidity conditions in China. The formation of nitrate at night mainly originated from N(2)O(5) uptake, and the maximum production rate of NO(3)(-) reached 6.5 ppbv/hr. The average NO(x) consumption rate via NO(3) and N(2)O(5) chemistry was found to be 0.4 ppbv/h, accounting for 47.9% of the total NO(x) removal. The predominant roles of NO(3) and N(2)O(5) in nitrate formation and NOx removal in the YRD region was highlighted in this study"
Keywords:		China Environmental Monitoring *Nitrates/analysis Nitrogen Oxides/chemistry *Rivers Cavity ring-down spectroscopy (CRDS) Dinitrogen pentoxide (N(2)O(5)) N(2)O(5) uptake Nighttime chemistry Nitrate radical (NO(3)) Styrene;
Notes:		"MedlineLin, Chuan Hu, Renzhi Xie, Pinhua Lou, Shengrong Zhang, Guoxian Tong, Jinzhao Liu, Jianguo Liu, Wenqing eng Netherlands 2022/04/24 J Environ Sci (China). 2022 Apr; 114:376-390. doi: 10.1016/j.jes.2021.09.016. Epub 2022 Feb 20"