基于双极化相控阵雷达的西天山南麓一次雹暴回波特征OA

Using observational data from the Aksu X-band dual-polarization phased-array weather radar,hail spectrometers,and conventional observations,this study systematically analyzes the characteristics and differences of echo parameters during a hailstorm event that occurred in the southern foothills of the western Tianshan Mountains on August 23,2024.The results indicate that the hailstorm originated from the organized development of a multicellular convective system,which persisted for an extended period and was accompanied by a typical hail signature—the V-notch.Hail formation is favored when the composite reflectivity(CR)reaches or exceeds 60 dBZ,accompanied by a compact intense echo core extending above the-20 ℃ isotherm.Moreover,the trend of vertical integrated liquid de-nsity(VILD)shows good consistency with that of vertical integrated liquid(VIL),while VIL exhibits more pronounced surges and fluctuations.These characteristics aid in locating strong echo cores and provide a basis for predicting hailstorm development and evolution.Polarimetric analysis reveals that high CR,combined with low differential reflectivity(ZDR),low correlation coefficient(CC),and low specific differential phase(KDP),serves as a typical indicator of mixed-phase hydrometeors,particularly in hail-dominated regions.These observations are highly consistent with the hydrometeor classification algorithm(HCL)products.