气候变化领域集成服务门户(CCPortal): Semi-quantitative understanding of source contribution to nitrous acid (HONO) based on 1 year of continuous observation at the SORPES station in eastern China

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DOI	10.5194/acp-19-13289-2019
	Semi-quantitative understanding of source contribution to nitrous acid (HONO) based on 1 year of continuous observation at the SORPES station in eastern China
	Liu Y.; Nie W.; Xu Z.; Wang T.; Wang R.; Li Y.; Wang L.; Chi X.; DIng A.
发表日期	2019
ISSN	16807316
起始页码	13289
结束页码	13308
卷号	19 期号:20
英文摘要	Nitrous acid (HONO), an important precursor of the hydroxyl radical (OH), has long been recognized as of significance to atmospheric chemistry, but its sources are still debated. In this study, we conducted continuous measurement of HONO from November 2017 to November 2018 at the SORPES station in Nanjing of eastern China. The yearly average mixing ratio of observed HONO was 0:69-0:58 ppb, showing a larger contribution to OH relative to ozone with a mean OH production rate of 1.16 ppb h-1. To estimate the effect of combustion emissions of HONO, the emitted ratios of HONO to NOx were derived from 55 fresh plumes (NO=NOx > 0.85), with a mean value of 0.79 %. During the nighttime, the chemistry of HONO was found to depend on RH, and heterogeneous reaction of NO2 on an aerosol surface was presumably responsible for HONO production. The average nighttime NO2-to-HONO conversion frequency (CHONO) was determined to be 0:0055-0:0032 h-1 from 137 HONO formation cases. The missing source of HONO around noontime seemed to be photo-induced, with an average Punknown of 1.04 ppb h-1, based on a semi-quantitative HONO budget analysis. An over-determined system of equations was applied to obtain the monthly variations in nocturnal HONO sources. Besides the burning-emitted HONO (accounting for about 23% of the total concentration), the contribution of HONO formed heterogeneously on ground surfaces to measured HONO was an approximately constant proportion of 36% throughout the year. The soil emission revealed clear seasonal variation and contributed up to 40% of observed HONO in July and August. A higher propensity for generating HONO on aerosol surfaces occurred in severe hazes (accounting for 40% of the total concentration in January). Our results highlight ever-changing contributions of HONO sources and encourage more long-term observations to evaluate the contributions from varied sources. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric chemistry; combustion; formation mechanism; haze; hydroxyl radical; mixing ratio; nitrous oxide; ozone; point source; quantitative analysis; temporal variation; China; Jiangsu; Nanjing [Jiangsu]
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/144068
作者单位	Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu Province, 210023, China; Jiangsu Provincial Collaborative Innovation Center of Climate Change, Nanjing, Jiangsu Province, 210023, China
推荐引用方式 GB/T 7714	Liu Y.,Nie W.,Xu Z.,et al. Semi-quantitative understanding of source contribution to nitrous acid (HONO) based on 1 year of continuous observation at the SORPES station in eastern China[J],2019,19(20).
APA	Liu Y..,Nie W..,Xu Z..,Wang T..,Wang R..,...&DIng A..(2019).Semi-quantitative understanding of source contribution to nitrous acid (HONO) based on 1 year of continuous observation at the SORPES station in eastern China.Atmospheric Chemistry and Physics,19(20).
MLA	Liu Y.,et al."Semi-quantitative understanding of source contribution to nitrous acid (HONO) based on 1 year of continuous observation at the SORPES station in eastern China".Atmospheric Chemistry and Physics 19.20(2019).