SODAR MEASUREMENTS FOR ATMOSPHERIC RESEARCH AND ENVIRONMENTAL MONITORING

IFU operates a MiniSODAR for probing the lower 200 m of the boundary l ayer with a vertical resolution of 5 m, and a ''long-distance'' SODAR which can measure up to more than 1000 m above ground with a vertical resolution between 20 and 50 m. The MiniSODAR is used for the detectio n of nocturnal cold air flows, pathways of fresh rural air entering ci ties, structures in stable nocturnal boundary layers and for the deter mination of parameters needed for dispersion modelling and wind energy applications. The long-distance SODAR can monitor the boundary layer during its diurnal course. Convective structures which are present ove r the whole vertical extend of the boundary layer become visible. Depe nding on noise and meteorological conditions 1300 m above ground can b e reached. Both measuring devices determine the three components of th e wind field and turbulence parameters.