Abstract
This paper introduced the algorithm of three-dimensional wind fields retrieval from dual-Doppler radar data based on variational method. In the proposed method, the three-dimensional wind fields are obtained by minimizing a cost function through variational approach. The main constraints included in this cost function are the radial velocities of two radars, mass continuity, vertical vorticity, and smoothness. The algorithm is tested with the dual-Doppler radar observation data collected during the case of extreme precipitation event in Huzhou of Zhejiang Province, on 5-6 September, 2019. The results indicate that the three-dimensional wind fields retrieved by this method are quite reasonable. The wind fields and related kinematic structure of convection system that produces extreme precipitations are successfully revealed.
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