Oral

IAMAS

M03 - Weather modification: theory, practice and technology

Research on the Explosion Effect of Hail Suppression Based on Phased Array Radar Observation Data

Explosion by anti-hail guns is one of the primary methods of artificial hail suppression in China, yet its specific mechanism of action remains not fully understood. Through four consecutive years ��2021-2024��of explosive hail suppression experiments at the Weining Hail Suppression Experimental Base in Guizhou province, certain research advancements have been achieved. Using high-spatiotemporal-resolution data from the X-band dual-polarization phased array radar, we analyzed macro and micro changes of a hailstorm cloud before and after hail suppression. We inversely analyzed the three-dimensional wind field of the hailstorm cloud using phased array radar data. Within one minute, the echo height, intensity, and vertically integrated liquid water content significantly decreased. The positive radial velocity column near the operation point broke, updraft velocity and area decreased, and downdraft velocity and area increased. In the explosion-affected area, strong echo samples rapidly decreased, weak echo samples increased, the number of hail particles rapidly decreased, and number of graupel particles increased. The cloud changed rapidly within minutes after the operation, most probably affected by the explosion. The explosion broke up large particles near the explosion point and decreased their diameter, and the dynamic disturbance generated inhibited the strong convective internal updraft, suppressing convective cloud development. The results provide some observational evidence for the explosion hail suppression theory.