Atmospheric turbulence characteristics in central London

The urban land-type has a great effect on the boundary layer and its characteristics, with implications for local urban climates and dispersion in urban areas. We describe recent progress from the DAPPLE project (Dispersion of Air Pollution and its Penetration into the Local Environment, www.dapple.org.uk), which aims to develop the understanding of atmospheric flow within and above urban street networks. From 2003 to 2008, a series of fullscale experiments were carried out in central London (UK), which were complemented by extensive wind-tunnel modeling for more detailed measurements under controlled conditions. In this poster we review the DAPPLE methodologies and show results from the analysis of recent campaign data, such as the applicability of Monin-Obukhov scaling and relationships between surface layer winds and within street winds.