Rayleigh Doppler Lidar for Higher Tropospheric and Stratospheric Wind Observation

A mobile molecular Doppler wind lidar (DWL) based on the double-edge technique is described for wind measurement from 10 km to 40 km altitude. Two edge filters located in the wings of the thermally broadened molecular backscattered signal spectrum at 355 nm are employed as a frequency discriminator to determine the Doppler shift proportional to the wind velocity. The lidar operates at 355 nm with a 45 cm aperture telescope and a matching azimuth-over-elevation scanner that can provide full hemispherical pointing. Intercomparison experiments of the lidar wind profile measurement are performed with collocated pilot balloon. The results show that the standard deviation of wind speed and direction are less than 10 m/s and 30 degrees in the 5-40 km altitude range, respectively. The small mean difference and normal distribution between DWL and pilot balloon data and the transient eddy of the west-wind jet observed demonstrate that the DWL consistently measures the wind with acceptable random errors.