关键词: 雷达, 动态Z-I关系法, 最优化法, 台风, 误差

Abstract:

Using the Doppler multi-radar mosaic data and surface precipitation data of encryption automatic stations in Liaoning province, the local dynamic Z-I relationships were established based on the optimization method to get the quantitative precipitation retrieval data with a real-time high spatiotemporal resolution. The method is used to retrieve the precipitation fields produced by typhoon " Meari" in 2011 and "Damrey" in 2012. The results show that the quantitative precipitation retrieval method can reproduce the main spatial distribution characteristics of the precipitation. . However, there is a large bias  in the strong precipitation center. In general, the retrieval  ability of quantitative precipitation for the local dynamic Z-I method is better than the fixed Z-I method. There is still systematic bias in the inversion data, i.e., overestimating the light rain and underestimating the heavy rain. For the heavy precipitation above 20.0 mm•h^-1, the average error is greater than -10.0 mm and the average relative error is greater than 70.0%. Further analysis shows that the differences in the proportion of different magnitudes of precipitation and the differences in the regional climate conditions are the two main reasons for the precipitation inversion error. This knowledge provides a way for the improvement of radar quantitative precipitation inversion in the future.