Retrieval of Three-Dimensional Wind Field of Typhoon by SVVP Method

Typhoons landing in China have caused severe calamity and loss in past years. Therefore, disaster prevention and reduction, and life and possession protection are very important and to be imperative under the circumstances. Many Doppler radar covering extensive areas are erected along the coast of Southeastern China, and they are crucial for monitoring and warning of severe weather. The radial velocity information received by Doppler radar can be recovered to real wind field by some retrieval method, which is important for the research on wind field structure and development and evolvement of typhoons. Velocity volume processing (VVP) is one of the mainly used methods for wind field retrieval. However, VVP method is disturbed by ill-conditioned matrix in calculation, leading to great error and thus its application is too much limited. Step velocity volume processing (SVVP) is an improved VVP method. It efficiently overcomes the ill-conditioned matrix problem in VVP method, and can acquire exact horizontal wind, horizontal shear, vertical wind, etc. In this paper, it is attempted to retrieve the three-dimensional wind field of typhoon by SVVP method. According to the retrieval experiments on simulated and real typhoon radial velocity data, we focus on the retrieval validity and feasibility of the vertical wind.