X波段双偏振雷达在冰雹和强降水天气识别中的初步应用

Preliminary Application of X-band Double Polarization Radar in the Identification of Hail and Heavy Rainfall

文章利用X波段双偏振雷达,通过分析差分反射率因子、差分传播相移和零滞后相关系数等双偏振参量特征,识别了呼和浩特地区两次强对流天气过程,并与对应时刻的地面雨滴谱观测资料进行对比,检验了识别效果。从个例分析结果来看,此X波段双偏振雷达具有较好的识别效果,当雷达回波强度大、差分传播相移小且差分反射率因子和零滞后相关系数也较小时,产生冰雹的可能性较大;当差分反射率因子值较大,差分传播相移高且零滞后相关系数接近1时,由大粒子组成的强降水天气的可能性大。同时,雨滴谱仪的天气现象识别、粒子谱连续监测和高频率数据采集等特征,在双偏振雷达的冰雹和强降水天气识别检验中提供了重要的数据支撑。

In this paper, the double-polarization parameters of differential refectivity factor, differential propagation phase shift and zero-lag correlation coeffcient are identifed by X-band double polarization radar. The two strong convective weather processes in Hohhot are identifed and compared with the observed data of ground raindrop spectrum at the corresponding time. The recognition effect was tested. From the results of case analysis, this X-band double polarization radar has a good recognition effect. When the radar echo intensity is large, differential propagation phase shift is small and differential reflectivity factor and zero-lag correlation coefficient are small, the possibility of producing hail is hight. When the differential refectivity factor value is large, differential propagation phase shift is high and the correlation coeffcient is close to 1, the possibility of strong precipitation weather composed of large particles is hight. At the same time, weather phenomenon identifcation, continuous particle spectrum monitoring and high frequency data acquisition are characteristics of the raindrop spectrometer. The characteristics of the raindrop spectrometer provide important data support in the hail and heavy rainfall weather identifcation by double polarized radar.