Vertical transport of accumulation mode particles between two street canyons and the urban boundary layer |
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| Authors: | J.A. Salmond L. Pauscher G. Pigeon V. Masson D. Legain |
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| Affiliation: | 1. Departamento de Física, Centro de Geofísica, Instituto de Investigação e Formação Avançada, Universidade de Évora, Évora, Portugal;2. Departamento de Física, Centro de Geofísica, Escola de Ciências e Tecnologia, Universidade de Évora, Évora, Portugal;3. Physics Department, University of Extremadura, Avd. Elvas, s/n, 06006 Badajoz, Spain;1. State Key Laboratory of Coal Resources and Safe Mining & College of Geosciences and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China;2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China;3. Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto 862-8502, Japan;4. Hebei Center for Ecological and Environmental Geology Research, Hebei GEO University, Shijiazhuang 050031, China;5. School of Forestry, Jiangxi Agricultural University, Nanchang 330045, China |
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| Abstract: | Concentrations and turbulent fluxes of accumulation mode particles were measured during the 2004–2005 ‘Canopy and Aerosol Particle Interaction in Toulouse Urban Layer’ project (CAPITOUL) at the top of two intersecting street canyons and in the urban boundary layer (UBL) in Toulouse, France. Particle numbers were strongly affected by boundary layer depth and showed limited sensitivity to local emissions. Differences in the diurnal patterns of particle numbers were observed between the finer fraction (0.3–0.4 μm) and coarser fraction (1.6–2.0 μm) of accumulation mode particles, indicating different processes of formation, evolution and transportation may be dominant. Highest particle numbers were observed in the narrow street canyon which had more limited local emissions and comparatively small particle fluxes. However, the improved ventilation rate in the wider canyon was also associated with the downward mixing of particles into the street canyon from the UBL. The results from this study clearly illustrate the temporal and spatial variability of particle numbers and fluxes in the urban atmosphere. |
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