Direct measurements and parameterisation of aerosol flux,concentration and emission velocity above a city |
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| Institution: | 1. Andalusian Institute for Earth System Research (IISTA-CEAMA), Granada, Spain;2. Dpt. Applied Physics, University of Granada, Granada, Spain;3. Institute of Research and Nuclear Energy (IPEN), São Paulo, Brazil;4. Atmospheric Optics Group (GOA), University of Valladolid, Valladolid, Spain;5. Sciences Faculty, Department of Physics, Universidad Nacional de Colombia, Medellín, Colombia;6. Insitute Pierre Simon Laplace, France;1. Andalusian Institute for Earth System Research (IISTA-CEAMA), University of Granada, Autonomous Government of Andalusia, 18006 Granada, Spain;2. Department of Applied Physics, University of Granada, Granada, Spain;3. Facultad de Ciencias, Departamento de Física, Universidad Nacional de Colombia, Medellín, Colombia;4. Federal Office of Meteorology and Climatology MeteoSwiss, Payerne, Switzerland;5. Atmospheric Optics Group (GOA-UVa), Valladolid University, Valladolid, Spain;6. Institute of Research and Nuclear Energy, IPEN, São Paulo, Brazil;7. Physical Sciences Department, School of Science, EAFIT University, Medellín, Colombia;8. Facultad de Minas, Departamento de Geociencias y Medio Ambiente, Universidad Nacional de Colombia, Medellín, Colombia |
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| Abstract: | Articles have recently been published on aerosol size distributions and number concentrations in cities, however there have been no studies on transport of these particles. Eddy covariance measurements of vertical transport of aerosol in the size range 11 nm<Dp<3 μm are presented here. The analysis shows that typical average aerosol number fluxes in this size range vary between 9000 and 90,000 cm?2 s?1. With concentrations between 3000 and 20,000 cm?3 this leads to estimates of particle emission velocity between 20 and 75 mm s?1. The relationships between number flux and traffic activity, along with emission velocity and boundary layer stability are demonstrated and parameterised. These are used to derive an empirical parameterisation for aerosol concentration in terms of traffic activity and stability. The main processes determining urban aerosol fluxes and concentrations are discussed and quantified where possible. The difficulties in parameterising urban activity are discussed. |
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