Roof Level Urban Tracer Experiment: Measurements and Modelling
In this study first results from a low-level source urban tracer SF6 experiment are reported. The experiment was performed in the framework of the Basel UrBan Boundary Layer Experiment — BUBBLE — in an area of the city of Basel (Switzerland) named Kleinbasel. Extensive micrometeorological information on the vertical structure of the atmospheric turbulence within the street canyons and the overlying urban roughness sublayer as well as the flow field over the city was available. In traditional applied dispersion modelling the roughness sublayer is considered sufficiently shallow not to affect the atmospheric dispersion process and fluxes are considered to be constant with height near the surface. This is not the case in the roughness sublayer that exists above an urban area; here fluxes vary considerably with height.
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