Characterization of turbulent processes by the Raman lidar system BASIL during the HD(CP)2 observational prototype experiment – HOPE

Measurements carried out by the Raman lidar system BASIL are reported to demonstrate the capability of this\udinstrument to characterize turbulent processes within the Convective Boundary Layer (CBL). In order to resolve the\udvertical profiles of turbulent variables, high resolution water vapour and temperature measurements, with a temporal\udresolution of 10 sec and a vertical resolution of 90 and 30 m, respectively, are considered. Measurements of higher-order\udmoments of the turbulent fluctuations of water vapour mixing ratio and temperature are obtained based on the application\udof spectral and auto-covariance analyses to the water vapour mixing ratio and temperature time series. The algorithms are\udapplied to a case study (IOP 5, 20 April 2013) from the HD(CP)2 Observational Prototype Experiment (HOPE), held in\udCentral Germany in the spring 2013. The noise errors are demonstrated to be small enough to allow the derivation of up\udto fourth-order moments for both water vapour mixing ratio and temperature fluctuations with sufficient accuracy