Linking urban aerosol fluxes in street canyons to larger scale emissions 1Centre for Atmospheric Science, SEAES, The University of Manchester, Manchester, M13 9PL, UK
2School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, P.O. Box 88, Manchester M60 1QD, UK
3Division of Environmental Health & Risk Management, School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Received: 12 Aug 2009 – Published in Atmos. Chem. Phys. Discuss.: 01 Sep 2009 Abstract. In this study we investigate ultrafine particle (UFP) fluxes using a first
order eddy viscosity turbulence closure Computational Fluid Dynamics (CFD)
model and determine the different factors that influence emissions of UFP
into the urban boundary layer. Both vertical turbulent fluxes as well as the
fluxes due to mean circulatory flow are shown to contribute to the overall
ventilation characteristics of street canyons. We then derive a simple
parameterised numerical prediction model for canyon top UFP venting which is
then compared with tower based micrometeorological flux measurements
obtained during the REPARTEE & CityFlux field experiments.
Revised: 14 Jan 2010 – Accepted: 02 Mar 2010 – Published: 11 Mar 2010
Citation: Tay, B. K., McFiggans, G. B., Jones, D. P., Gallagher, M. W., Martin, C., Watkins, P., and Harrison, R. M.: Linking urban aerosol fluxes in street canyons to larger scale emissions, Atmos. Chem. Phys., 10, 2475-2490, doi:10.5194/acp-10-2475-2010, 2010.