Experiment And Study On Single-Doppler Radar Wind Field Retrieval Method

This article uses Advanced Simple Adjoint Model to do experimental retrieval of snowstorm, hail, typhoon and boundary layer echo of clear sky. Then discuss the results of the retrieval, retrieving errors, and the difficult of using in weather forecast. We conclude following:1. Through retrieving wind field of snowstorm, hail, typhoon and such strong weather systems, we find that the wind direction in lower layer is almost the same as the analyzed results of radial wind field.2. Through analyzing the wind field, we conclude that local strong rainfall's possible wind field distribution is vertical velocity's ascending and descending, horizontal velocity's convergence in lower layer, and the slide cut of wind direction.3. Clear sky echo's wind field retrieval results is accord with radar's radial velocity, so it provides a method to acquire the movement of boundary layer turbulence.4. Try to use in weather forecast we still have such problems: lack quality control to base data, low efficiency of retriveing programs, cannot choosing retrieving area by computer and lack of certification from actual observation data.5. The problems, such as numerical difference among wind velocities, imperfect matching between retrieving wind and radial wind , wind velocity's discontinuous in boundary and partial area are correlated with those factors, such as restraining equations nonlinear, selection of initial and boundary condition, interpolation of wind vector, and selection of weight coefficients.