The flow- and turbulence field as well as energy fluxes were measured at a number of surface-sites inside and around the city of Basel. Two experimental surface towers were operated over nearly one year in the heavily built-up part of the city (Ue1 and Ue2). The instrumentation was heavily extended during the IOP between June 15 2002 and July 12 2002. Additional towers were installed in regions of surface structure that is distinctly different from that at these two main sites, such the 'european suburban' station in Allschwil (Se1) and ural reference sites with  the full surface energy balance (Re1, Re2). 

At the same time, the flow field in the bulk of the urban boundary layer was continuously monitored using remote sensing techniques (wind profiler, LIDAR, SODAR, RASS). Finally a big number of operational and existing 'background stations' provide more spatially distributed data of the wind- and temperature-field.

Map of the measurement stations during BUBBLE-IOP with tracer area (white). Some rural sites are out of map, see list of all Stations. Download map in GIF-format: Medium (800 x 440): b&w / color Large (1600 x 880): b&w / color Download map in EPS-format: b&w / color