气候变化领域集成服务门户(CCPortal): Budget of nitrous acid and its impacts on atmospheric oxidative capacity at an urban site in the central Yangtze River Delta region of China

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DOI	10.1016/j.atmosenv.2020.117725
	Budget of nitrous acid and its impacts on atmospheric oxidative capacity at an urban site in the central Yangtze River Delta region of China
	Shi X.; Ge Y.; Zheng J.; Ma Y.; Ren X.; Zhang Y.
发表日期	2020
ISSN	1352-2310
卷号	238
英文摘要	In this study, we used a wet chemistry based long-path absorption spectroscopy method to measure HONO in Changzhou, in the central Yangtze River Delta region (YRD) of China, from April 3–24, 2017. During the observation period, the average HONO mixing ratio was 1.55 ± 1.21 ppbv. In addition, the average OH formation rates of the photolysis of HONO, O3, HCHO and H2O2 along with ozonolysis of alkenes were 7.84 × 106, 2.02 × 107, 7.41 × 105, 3.79 × 105 and 1.51 × 106 molecules cm−3 s−1, respectively. At nighttime, the average conversion rate from NO2 to HONO was determined to be ~0.018 h−1. In this work, the primary emission rate of HONO was determined by the ratios of HONO to nitrogen oxides (NOx = NO + NO2) within freshly emitted plumes (NO/NOx > 0.85) and a value of ~0.69% was obtained. The sources of HONO were further investigated through a box model utilizing the Master Chemical Mechanism. The simulation results show that primary emissions contributed only ~12.3% of the total HONO budget during daytime but a substantial portion (31.4%) at night. Comparing to heterogeneous HONO sources, the gas-phase NO + OH reaction was the less important HONO source, with a contribution of 14.2% at night and 28.7% during the daytime. Heterogeneous reactions of NO2 on various surfaces (mostly the ground surface) were responsible for most of the observed HONO, i.e., 34.7% during the day and 54.4% at night. Overall, nighttime HONO can be reasonably explained by aforementioned mechanisms. However, daytime HONO cannot be fully accounted for without the consideration of nitrate photolysis, which contributed ~24.1% of the daytime HONO according to the model simulation. Our findings highlight that photolysis of particulate nitrate could be an important source of daytime HONO, providing a channel to cycle NO and OH radical back into the photochemical system and further enhancing the atmospheric oxidative capacity within the air shed of a typical industrial zone of China. © 2020 Elsevier Ltd
关键词	Atmospheric oxidative capacity Heterogeneous chemistry HONO OH radical Photolysis of nitrate
语种	英语
scopus关键词	Absorption spectroscopy; Atmospheric chemistry; Budget control; Free radicals; Nitrates; Nitrogen oxides; Ozone; Particulate emissions; Photolysis; Spectroscopic analysis; Urban growth; Heterogeneous reactions; Master chemical mechanism; Observation Period; Oxidative capacity; Particulate nitrate; Photochemical systems; Primary emissions; Yangtze river delta; Inorganic acids; alkene derivative; hydrogen peroxide; hydroxyl group; hydroxyl radical; nitrate; nitrogen dioxide; nitrogen oxide; nitrous acid; atomic absorption spectroscopy; industrial emission; mixing ratio; nitrous acid; oxidation; photolysis; urban pollution; absorption spectroscopy; air pollutant; air pollution; Article; atmosphere; atmospheric deposition; budget; carbon footprint; chemical reaction; chemistry; China; controlled study; environmental impact; environmental monitoring; molecule; Monte Carlo method; oxidation; ozonolysis; particulate matter; photolysis; plume; priority journal; river; simulation; surface property; urban area; Changzhou; China; Jiangsu; Yangtze Basin
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249024
作者单位	Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing, 210044, China; NUIST Reading Academy, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Air Resources Laboratory, National Oceanic and Atmospheric Administration, College Park, MD, United States; Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, United States; Cooperative Institute for Satellite Earth System Studies, University of Maryland, College Park, MD, United States
推荐引用方式 GB/T 7714	Shi X.,Ge Y.,Zheng J.,et al. Budget of nitrous acid and its impacts on atmospheric oxidative capacity at an urban site in the central Yangtze River Delta region of China[J],2020,238.
APA	Shi X.,Ge Y.,Zheng J.,Ma Y.,Ren X.,&Zhang Y..(2020).Budget of nitrous acid and its impacts on atmospheric oxidative capacity at an urban site in the central Yangtze River Delta region of China.ATMOSPHERIC ENVIRONMENT,238.
MLA	Shi X.,et al."Budget of nitrous acid and its impacts on atmospheric oxidative capacity at an urban site in the central Yangtze River Delta region of China".ATMOSPHERIC ENVIRONMENT 238(2020).