THE CONVECTIVE BOUNDARY-LAYER STRUCTURE FROM LIDAR AND RADIOSONDE MEASUREMENTS DURING THE EFEDA-91 CAMPAIGN

The convective boundary layer has been investigated with an airborne d ifferential absorption lidar (DIAL) during the EFEDA (European Field E xperiment in a Desertification Threatened Area) campaign in June 1991 over middle Spain. For the first time, airborne DIAL water vapor measu rements resolving the structure of a convection cell are presented. On 28 June, an interesting boundary layer structure has been found in th e lidar aerosol and water vapor measurements, showing a wave structure with a wavelength of 4.5 km and an amplitude of 100-450 m in the resi dual layer. Additional radiosonde data and the analysis of the synopti c situation reveal that this wave structure is part of a wind shear-dr iven gravity wave.