Clouds — BBC2 campaign May 2003 at Cabauw

From May 3 rd till 24th 2003, the intensive (cloud) measurement campaign “BBC2” was hero at Cabauw, the Netherlands. The BBC2 campaign was jointly organised by the University of Bonn and KNMI. The University of Bonn was coordinator of the German 4DCLOUDS project, KNMI is coordinator of the Cabauw atmospheric research observatory and member of the Dutch CESAR consortium. Beside these two research groups a number of other institutes has joint individually, in total some 100 scientists from 20 institutes participated. As most objectives and many participants are the same as those of the Baltex Bridge Campaign (BBC) in August-September 2001 organised in the framework of CLIWA-NET and 4DCLOUDS, the campaign has been named BBC2. Although the focus of the campaign was on clouds and radiation, other subjects of research were of interest like turbulence in the atmospheric boundary layer and small scale structure of rainfall. Instrumentation deployed covers a wide range of important parameters. A number of advanced active and passive remote sensing systems was operated in Cabauw. In-situ particle probes were operated on aircrafts and from a tethered balloon. Radiation sensors for long and short wave range were mounted on aircrafts and operated on the ground. Turbulence measurements were performed on the different platforms, including the 213 m high meteorological tower. Radio probes were launched regularly during the campaign.