DOI: 10.1016/j.atmosenv.2017.08.018
Scopus记录号: 2-s2.0-85027556626
论文题名: Nitrous acid in a street canyon environment: Sources and contributions to local oxidation capacity
作者: Yun H ; , Wang Z ; , Zha Q ; , Wang W ; , Xue L ; , Zhang L ; , Li Q ; , Cui L ; , Lee S ; , Poon S ; C ; N ; , Wang T
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 167 起始页码: 223
结束页码: 234
语种: 英语
英文关键词: Nitrous acid (HONO)
; Observation-based box model
; Oxidation capacity
; Roadside
; Street canyon
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Nitrous acid (HONO) plays an important role in radical formation and photochemical oxidation processes in the boundary layer. However, its impact on the chemistry in a street canyon microenvironment has not been thoroughly investigated. In this study, we measured HONO in a street canyon in urban Hong Kong and used an observation-based box model (OBM) with the Master Chemical Mechanism (MCM v3.3.1) to investigate the contribution of HONO to local oxidation chemistry. The observed HONO mixing ratios were in the range of 0.4–13.9 ppbv, with an average of 3.91 ppbv in the daytime and 2.86 ppbv at night. A mean HONO/NOx emission ratio of 1.0% (±0.5%) from vehicle traffic was derived. OBM simulations constrained by the observed HONO showed that the maximum concentrations of OH, HO2, and RO2 reached 4.65 × 106, 4.40 × 106, and 1.83 × 106 molecules cm−3, which were 7.9, 5.0, and 7.5 times, respectively, the results in the case without HONO constrained. Photolysis of HONO contributed to 86.5% of the total primary radical production rates and led to efficient NO2 and O3 production under the condition of weak regional transport of O3. The formation of HNO3 contributed to 98.4% of the total radical termination rates. Our results suggest that HONO could significantly increase the atmospheric oxidation capacity in a street canyon and enhance the secondary formation of HNO3 and HCHO, which can damage outdoor building materials and pose health risks to pedestrians. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82196
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, China; Environment Research Institute, Shandong University, Ji'nan, Shandong, China
Recommended Citation:
Yun H,, Wang Z,, Zha Q,et al. Nitrous acid in a street canyon environment: Sources and contributions to local oxidation capacity[J]. Atmospheric Environment,2017-01-01,167