一次人工防雹作业的双偏振雷达特征分析

Characteristics of Dual-polarization Radar in an Artificial Anti-hail Operation

利用红河C波段双偏振雷达资料,分析了2020年3月17日红河州冰雹天气过程中双偏振雷达产品特征及在人工防雹中的应用。结果表明:本次冰雹天气过程主要影响天气系统是冷锋切变,蒙自探空站T-lnP图及V-3θ图上表现出明显的对流潜势特征。雷达常规产品表现出典型的冰雹结构特征。双偏振特征量中,差分反射率低值区对应反射率因子的高值区,且为大冰雹中心,对应的Z_(DR)在-0.39~0.10 dB,中高层出现了明显的Z_(DR)异常大值区,幅相相关系数较低,在0.87~0.93,K_(DP)在-0.10~-0.01°/km,表明冰雹表面较干。防雹作业后对比分析,作业区各项雷达产品指标均下降且未出现冰雹,而非作业区冰雹特征依然明显且出现冰雹。

The characteristics of dual-polarization radar products and its application in artificial antihail operation of a hail event on March 17th 2020 are analyzed based on the C-band dual-polarization radar data of Honghe.The results show that the main weather system affecting the hail process is the cold front and shear line,the T-lnP and V-3θ charts of Mengzi sounding station show the obvious convection potential characteristics.Radar conventional products show typical hail characteristics.Hail can be identified by the dual-polarization parameters,hail usually exist in the area with strong reflectivity,low value of Z_(DR) and CC,the typical value of Z_(DR) is usually between-0.39 and 0.10 dB and the value of CC is between 0.87 and 0.93,anomalously large value region of Z_(DR) appears at the upper level,while the value of K_(DP) is between-0.10 and-0.01°/km.After the anti-hail operation,the comparative analysis showed that all radar product indexes in the operation area decreased without hail,while the hail characteristics in the non-operation area were still obvious with hail.