Analysis on Wind Profiling Radar Data of a Rainstorm at Lin’an

Abstract

A Meiyu front rainstorm process from June 23rd to June 24th, 2017 has been analyzed in detail by using CFL-03 boundary-layer wind profiling radar at Lin'an, and the results show that wind profiling radar observations are able to reflect characteristics of meso-scale vortex shear line during the meiyu front system. The main reason why the precipitation was relatively concentrated at the beginning and end of this process is that low-level wind shear happened to move over Lin'an during those periods. Due to upper level jet this rainstorm has lasted for a long time. Except wind profiles, radar echo intensity has been estimated by power spectrum data to analyze the details of developments of the rainstorm, and it is found that precipitation clouds have developed vigorously with height over 5 km. Other wind profiling radar products, such as, vertical velocity and atmospheric refractive index structure constant, both have changed in a identical way comparing with the precipitation. When the precipitation is above 10 mm, vertical velocity is around 7 m/s and logarithm of atmospheric refractive index structure constant is about -11. Consequently wind profiling radar products can be used to monitor rainstorms and serve in operational systems.