DOI: 10.1016/j.atmosenv.2013.11.056
Scopus记录号: 2-s2.0-84890821394
论文题名: Diurnal profiles of isoprene, methacrolein and methyl vinyl ketone at an urban site in Hong Kong
作者: Cheung K ; , Guo H ; , Ou J ; M ; , Simpson I ; J ; , Barletta B ; , Meinardi S ; , Blake D ; R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 84 起始页码: 323
结束页码: 331
语种: 英语
英文关键词: Hong Kong
; Isoprene oxidation products
; Methacrolein
; Methyl vinyl ketone
Scopus关键词: Direct measurement
; Hong-kong
; Methacrolein
; Methyl vinyl ketones
; Oxidation products
; Peak concentrations
; Positive Matrix Factorization
; Urban environments
; Carbon monoxide
; Ketones
; Mixing
; Nitrogen oxides
; Oxidation
; Sulfur dioxide
; Urban growth
; Isoprene
; carbon monoxide
; isoprene
; ketone derivative
; methacrolein
; methylvinyl ketone
; nitrogen oxide
; ozone
; sulfur dioxide
; unclassified drug
; biogenic emission
; carbon monoxide
; combustion
; diurnal variation
; fuel consumption
; isoprene
; ketone
; mixing ratio
; nitrogen dioxide
; oxidation
; ozone
; regression analysis
; sulfur dioxide
; traffic emission
; urban atmosphere
; urban site
; ambient air
; article
; circadian rhythm
; concentration (parameters)
; controlled study
; environmental temperature
; Hong Kong
; in vivo study
; limit of detection
; oxidation
; photochemistry
; photooxidation
; priority journal
; rural area
; solar radiation
; titrimetry
; urban area
; vegetation
; China
; Hong Kong
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: Methacrolein (MACR) and methyl vinyl ketone (MVK) are major oxidation products of isoprene, but they also have primary emissions in urban environments, for example from fuel use. To examine whether MACR and MVK could be used as a direct measurement of the oxidation rate of isoprene in an urban setting, the diurnal variations of isoprene, MACR and MVK were characterized at an urban site in Hong Kong from September to November, 2010. Ozone (O3), carbon monoxide (CO), sulfur dioxide (SO2), and nitrogen oxides (NOx) were simultaneously monitored. The average isoprene mixing ratio was 252±204pptv, with a bell-shaped distribution observed on most sampling days. Higher levels of isoprene were recorded in the beginning of the sampling period, when the temperature was higher. The average mixing ratios of MACR and MVK were 101±85pptv and 175±131pptv, respectively. While isoprene, MACR and MVK experienced peak concentrations from 11 a.m. to 3 p.m., increased levels of MACR and MVK during the morning rush hour did not coincide with isoprene. The low associations between isoprene and MACR/MVK suggest that either MACR/MVK were not formed from local isoprene oxidation and/or they could partly originate from primary emissions such as fuel evaporation or combustion. Statistical analyses of linear regression and positive matrix factorization revealed that approximately 20-29% of the measured MACR and MVK was associated with biogenic emissions, and 55-71% was impacted by vehicular emissions, particularly during morning rush hours. Since MACR and MVK originated from both primary emissions and biogenic emissions at this urban site, they can therefore overestimate the actual rate of isoprene oxidation and its contribution to O3 production in urban areas with strong primary emissions. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80787
Appears in Collections: 气候变化事实与影响
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作者单位: Air Quality Studies, Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Department of Chemistry, University of California-Irvine, Irvine, CA, United States
Recommended Citation:
Cheung K,, Guo H,, Ou J,et al. Diurnal profiles of isoprene, methacrolein and methyl vinyl ketone at an urban site in Hong Kong[J]. Atmospheric Environment,2014-01-01,84