Analysis of a Supercell Using S-band Dual-polarization Radar and X-band Phased Array Radar
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Abstract:
Using the data of Guangzhou S-band dual-polarization radar and X-band phased array radar, we analyze the radar observation characteristics of a supercell on March 26, 2022. The results show that this supercell showed classical structural features such as hook echo, drape echo, and three-body scatter signature (TBSS). Other structures, such as low-level convergence, upper-level divergence, mesocyclone and anticyclones, contributed to the maintenance of the supercell. Analysis of the polarization features shows that the differential reflectivity (ZDR) arc appeared in the low layer of the supercell, and the high reflectivity corresponded to low ZDR, low correlation coefficient (CC) and high specific differential phase (KDP), which conformed to the characteristics of melting hail. The polarization characteristics of the ZDR ring, CC ring and TBSS were observed in the middle layer. The high-rise strong-echo regions corresponded to low ZDR, higher CC, and low KDP, helping to identify large hail. The ZDR and the KDP columns were observed in the vertical direction, and the maximum development height of the ZDR column reached 8 km. The KDP column could reflect changes in the region of the supercell containing large amounts of liquid water droplets, and the KDP foot could identify the region where the heavy precipitation was located. The faster scanning speed of X-band phased array radar could finely monitor the formation and evolution of supercell hook echo and mesocyclones. ZDR arc and melting hail features were also observed at low layers with patterns similar to those by S-band dual-polarization radar, but the effects of attenuation should be dealt with with caution.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.