Effect of turbulence on accuracy of wind retrieval from Doppler lidar data by spectra accumulation method

摘要

In we describe new method, which we referred to as the spectra accumulation method (SAM), for reconstruction of wind velocity and direction from measurement data of a scanning coherent Doppler lidar. The method does not require pre-estimation of the radial wind velocity. Numerical simulation based on virtual Doppler lidar instrument shows that in absence of turbulence SAM allows reconstruction of the wind velocity and direction from satellite lidar measurements with sufficiently high accuracy. In this paper we study the accuracy of wind retrieval from lidar data by SAM when turbulent fluctuations of wind velocity are present. Simulation of wind retrieval from space borne scanning Doppler lidar data we carry out based on the real data of German Weather Service (GWS). For simulation of small scale turbulent fluctuations of the radial wind velocity we use GWS height profiles of zonal and meridional components of mean wind, temperature and turbulent diffusion coefficients of momentum and heat. The error of retrieval of wind velocity and direction from lidar data is calculated in dependence on turbulent velocity fluctuations variance for different heights (signal to noise ratios). This study was supported by the Russian Foundation for Basic Research (Grant №00-05-64033).