Turbulence measurements in the PBL with a ultrasonic anemometer

Our study concerns the analysis of the data collected by a 3 axes research ultrasonic anemometer, asymmetric version [1], produced by Gill Instruments and bought by Institute of General Physics ot the University or Turin in 1991 and by the ENEL/CRAM of Milan in 1992. The theoretical methods adopted to evaluate the sonic temperature starting from the sound speed and to evaluate the dry temperature starting from the sonic one are described. A method used to solve the anomometer misalignment problem is shown and then an original method used to evaluate sensible and latent heat fluxes starting from the kynematic flux <Ts'w'> is described. Finally, a few plots or T and sensible and latent heat fluxes evaluated with the methods here described are presented.