雨滴谱数据在S波段双偏振天气雷达数据质量评估中的应用

Application of Raindrop Disdrometer Data in Data Quality Evaluation of S-Band Dual-Polarization Weather Radar

结合T-Matrix方法和雨滴谱仪数据反演双偏振参量,设计了一种雨滴谱反演评估方法(雨滴谱法),利用其反演结果可对双偏振天气雷达数据进行评估。将此方法应用于不同类型降水过程的雷达偏振参量数据质量评估,结果表明:满足微雨条件时,雨滴谱法与传统的微雨滴法均能有效监测由雷达系统误差导致的观测偏差,且评估结果十分接近;不满足微雨条件时,雨滴谱法评估的不同类型降水过程的雷达数据质量与满足微雨条件下的评估结果十分接近,客观证明了系统调整后雷达运行良好、数据质量稳定;不同雨强(R)情况下,雨滴谱法的评估结果具有一致性。10 mm·h^(-1)≤R<20 mm·h^(-1)时,雷达观测的数据质量最为稳定。该雨滴谱法适用范围广,可动态评估双偏振雷达偏振参量质量,有助于雷达调整和数据校正。

This article uses the T-Matrix method and raindrop spectrometer data to invert the dual-polarization parameters,and the inversion result is used to evaluate the dual-polarization weather radar data,which is the raindrop spectrum inversion evaluation method.Then this method is used to evaluate the data quality of polarization parameter in different types of precipitation.The results show that under the conditions of micro-raindrop,the raindrop spectrum inversion evaluation method can effectively monitor the systematic deviation of the polarization parameters caused by the radar systematic error as the same as micro-raindrop method,and the evaluation results of the two methods are basically consistent.When the micro-raindrop condition is not satisfied,the radar polarization parameter quality of different types of precipitation processes evaluated by the raindrop spectrum inversion evaluation method is basically consistent with the evaluation results under the conditions of micro-raindrop,reflecting the objective fact that the radar operates well and the data quality is stable.The raindrop spectrum inversion evaluation method has consistency in evaluating radar polarization parameters under different rainfall intensities.When the rainfall intensity of precipitation process is≥10 mm·h^(-1)and<20 mm·h^(-1),the data quality of the dual-polarization radar is the most stable.The raindrop spectrum inversion evaluation method has a wide range of applications and can be used for real-time monitoring of dualpolarization radar data quality.The evaluation results can provide timely reference for radar calibration and data correction.