11 Mar 2010
11 Mar 2010
Linking urban aerosol fluxes in street canyons to larger scale emissions
B. K. Tay1, G. B. McFiggans1, D. P. Jones2, M. W. Gallagher1, C. Martin1, P. Watkins2, and R. M. Harrison3
B. K. Tay et al.
B. K. Tay1, G. B. McFiggans1, D. P. Jones2, M. W. Gallagher1, C. Martin1, P. Watkins2, and R. M. Harrison3
- 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
- 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
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Received: 12 Aug 2009 – Discussion started: 01 Sep 2009 – Revised: 14 Jan 2010 – Accepted: 02 Mar 2010 – Published: 11 Mar 2010
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.
