Measurements and analyses of nitrogen oxides and ozone in the yard and on the roof of a street-canyon in Suzhou |
| |
| Institution: | 1. Department of Civil and Environmental Engineering, University of Cyprus, Nicosia, Cyprus;2. Department of the Built Environment, Eindhoven University of Technology, Eindhoven, the Netherlands;1. School of Atmospheric Sciences, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, PR China;2. Institute for Environmental and Climate Research, Jinan University, Guangzhou, PR China;3. Department of Building Services Engineering, Hong Kong Polytechnic University, Hong Kong;4. Department of Mechanical Engineering, The University of Hong Kong, Hong Kong |
| |
| Abstract: | The concentrations of air pollutants such as nitrogen oxides and ozone characterised by very fast chemical reactions can significantly vary within urban street-canyon due to the short distances between sources and receptor. With the primary objective to analyse this issue, NO, NO2, NOx, O3, BTX, and wind flow field were continuously measured for 1 week at two heights (a street-level yard and a 25-m-high rooftop) in an urban canyon in Suzhou (China). The yard ozone concentrations were found to be up to six times lower than on the roof. Different frequency distributions (FD), dynamical and chemical processes of the pollutant variations from yard to roof are discussed to explain the findings. The predominant factors for the dissimilar pollutant vertical diffusion at the two measurement locations were associated to dissimilar fluid-dynamic and heterogeneous removal effects that likely induced dissimilar ozone chemical processes relative to NOx and BTX precursors. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
