DOI: 10.1002/2013JD020341
论文题名: Urban measurements of atmospheric nitrous acid: A caveat on the interpretation of the HONO photostationary state
作者: Lee B.H. ; Wood E.C. ; Herndon S.C. ; Lefer B.L. ; Luke W.T. ; Brune W.H. ; Nelson D.D. ; Zahniser M.S. ; Munger J.W.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 12274
结束页码: 12281
语种: 英语
英文关键词: nitrous acid
; photostationary state
; secondary production
; urban measurement
Scopus关键词: Atmospheric chemistry
; Nitrogen oxides
; Photolysis
; Laser absorption spectroscopy
; Measurement sites
; Nitrous acid
; Photostationary state
; Production rates
; Radical precursor
; Secondary production
; Urban atmospheres
; Inorganic acids
; air sampling
; atmospheric pollution
; exhaust emission
; organic acid
; pollutant transport
; secondary production
; spatiotemporal analysis
; urban atmosphere
; Houston
; Texas
; United States
英文摘要: Numerous studies infer the existence of an "unknown" daytime HONO source based on the assumption that HONO is at photostationary state (PSS). Secondary HONO production rate as high as 1.1 ppb hr-1 can be estimated from this approach, based on measurements made during the Study of Houston Atmospheric Radical Precursors campaign in May of 2009. We argue, however, that the PSS assumption might not have been valid because the transport time from nearby NOx emission sources to the measurement site was likely less than the time required for HONO in vehicle exhaust to reach PSS. Using a chemical box model, we demonstrate that there is initially net HONO formation as high levels of NO in exhaust react with ambient OH. Net production is followed by a period of net HONO loss dominated by photolysis that is sustained for several minutes to hours depending on time of day. The presence of relatively fresh exhaust in sampled air can partially, if not fully, account for the observed measurement PSS discrepancy. We also show that a large fraction of the observed nighttime increase in HONO/NOx ratio is explained by NO2 oxidation. These results do not rule out the existence of an unexplained secondary HONO source but suggest that great care must be exercised when applying the PSS method to quantify its strength. Key Points Nitrous acid measured in urban atmosphere via laser absorption spectroscopy Day HONO near emission source not at PSS, misinterpreted as secondary production Night HONO:NOx cannot be used to infer production without counting NO 2 oxidation ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 0814202
; AGS-0813617
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63193
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: School of Engineering and Applied Science, Harvard University, 20 Oxford Street, Cambridge, MA 02138, United States; Department of Public Health, University of Massachusetts, Amherst, MA, United States; Center for Atmospheric and Environmental Chemistry, Aerodyne Research, Inc., Billerica, MA, United States; Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, United States; Air Resources Laboratory, National Oceanic and Atmospheric Administration, Silver Spring, MD, United States; Department of Meteorology, Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Lee B.H.,Wood E.C.,Herndon S.C.,et al. Urban measurements of atmospheric nitrous acid: A caveat on the interpretation of the HONO photostationary state[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)