气候变化领域集成服务门户(CCPortal): Exploration of the atmospheric chemistry of nitrous acid in a coastal city of southeastern China: results from measurements across four seasons

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DOI	10.5194/acp-22-371-2022
	Exploration of the atmospheric chemistry of nitrous acid in a coastal city of southeastern China: results from measurements across four seasons
	Hu, Baoye; Duan, Jun; Hong, Youwei; Xu, Lingling; Li, Mengren; Bian, Yahui; Qin, Min; Fang, Wu; Xie, Pinhua; Chen, Jinsheng
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	371
结束页码	393
卷号	22 期号:1 页码:23
英文摘要	Because nitrous acid (HONO) photolysis is a key source of hydroxyl (OH) radicals, identifying the atmospheric sources of HONO is essential to enhance the understanding of atmospheric chemistry processes and improve the accuracy of simulation models. We performed seasonal field observations of HONO in a coastal city of southeastern China, along with measurements of trace gases, aerosol compositions, photolysis rate constants (J), and meteorological parameters. The results showed that the average observed concentration of HONO was 0.54 +/- 0.47 ppb. Vehicle exhaust emissions contributed an average of 1.45 % to HONO, higher than the values found in most other studies, suggesting an influence from diesel vehicle emissions. The mean conversion frequency of NO2 to HONO in the nighttime was the highest in summer due to water droplets evaporating under high-temperature conditions. Based on a budget analysis, the rate of emission from unknown sources (R-unknown) was highest around midday, with values of 4.51 ppb h(-1) in summer, 3.51 ppb h(-1) in spring, 3.28 ppb h(-1) in autumn, and 2.08 ppb h(-1) in winter. Unknown sources made up the largest proportion of all sources in summer (81.25 %), autumn (73.99 %), spring (70.87 %), and winter (59.28 %). The photolysis of particulate nitrate was probably a source in spring and summer while the conversion from NO2 to HONO on BC enhanced by light was perhaps a source in autumn and winter. The variation of HONO at night can be exactly simulated based on the HONO / NOx ratio, while the J(NO3-_R) x pNO(3)(-) should be considered for daytime simulations in summer and autumn, or 1/4x (J(NO3-_R) x pNO(3)(-)) in spring and winter. Compared with O-3 photolysis, HONO photolysis has long been an important source of OH except for summer afternoons. Observation of HONO across four seasons with various auxiliary parameters improves the comprehension of HONO chemistry in southeastern coastal China.
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:000743986900001
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/273596
作者单位	Chinese Academy of Sciences; Institute of Urban Environment, CAS; Chinese Academy of Sciences; Institute of Urban Environment, CAS; MinNan Normal University; MinNan Normal University; Chinese Academy of Sciences; Anhui Institute of Optics & Fine Mechanics (AIOFM), CAS; Hefei Institutes of Physical Science, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS
推荐引用方式 GB/T 7714	Hu, Baoye,Duan, Jun,Hong, Youwei,et al. Exploration of the atmospheric chemistry of nitrous acid in a coastal city of southeastern China: results from measurements across four seasons[J],2022,22(1):23.
APA	Hu, Baoye.,Duan, Jun.,Hong, Youwei.,Xu, Lingling.,Li, Mengren.,...&Chen, Jinsheng.(2022).Exploration of the atmospheric chemistry of nitrous acid in a coastal city of southeastern China: results from measurements across four seasons.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(1),23.
MLA	Hu, Baoye,et al."Exploration of the atmospheric chemistry of nitrous acid in a coastal city of southeastern China: results from measurements across four seasons".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.1(2022):23.