QUALITY CONTROL OF SINGLE DOPPLER RADAR DATA AND RETRIEVAL OF HORIZONTAL WIND FOR A LANDING TYPHOON

The removal of noise and velocity ambiguity and retrieval and verification of horizontal windfield is a prerequisite to make the best and fullest use of Doppler radar measurements. This approach wasapplied to the Doppler radar data collected during August 2005 for a landing typhoon Matsa (0509) inYantai, Shangdong Province, and the verified result shows that the quality control for this dataset wassuccessful. The horizontal wind field was retrieved and then verified by studying the characteristics of theradar radial velocity and large-scale wind field and the vertical cross section of the radial velocitydetermined with the typhoon center as the circle center and comparing it with satellite imagery. The resultsshow that the meso- and small-scale systems in Matsa and its horizontal and vertical structure could beclearly retrieved using the dataset collected by single Doppler radar, and a shear or a convergence wascorresponding with a band of severe storm around Matsa. At the same time, the retrieved wind field fromsingle Doppler radar is proved to be a reliable and high-resolution dataset in analyzing the innermeso-scale structure of Matsa. It is also proved that the method for removing the velocity ambiguity couldbe an effective approach for preliminary quality control of the Doppler radar data, and the VAP methodcould also be a reasonable solution for the analysis of mesoscale wind field.