A Case Study of Effectiveness of Artificial Hail SuppressionBased on Dual Polarization Radar Data
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Abstract:
The cloud macrostructure and microphysical characteristics such as particle phase are tracked and analyzed based on the polarization radar data during an artificial hail suppression operation on 11 June 2011. In the analysis, the clouds with the operational conditions similar to those of the seeding area are set as the control area. Both the control area and seeding area are analyzed at different heights before and after seeding based on the echo moving direction and velocity. The results show that the height of the cloud top and strong echo center in the seeding area fell rapidly after the seeding, but the variations in the control area were not obvious. In the seeding area, differential reflectivity〖WTBX〗 Z〖WTBZ〗dr and zero correlation coefficient 〖WTBX〗ρ〖WTBZ〗hv increased with decreasing horizontal reflectivity〖WTBX〗 Z〖WTBZ〗h and differential propagation phase shift 〖WTBX〗K〖WTBZ〗dp fluctuated in small scope. In the control area, 〖WTBX〗ρ〖WTBZ〗hv also increased but the variation of 〖WTBX〗Z〖WTBZ〗h、〖WTBX〗Z〖WTBZ〗dr and〖WTBX〗 K〖WTBZ〗dp were not obvious. In addition, in the seeding area, the convection weakened with obvious falling of large hail particles and big rain drops. In the end, most particles in the clouds were turned to graupel particles. However, in the control area, the convection was still prosperous with the increasing of hail particles. Thus, the characteristics above indicate that the hail suppression work can inhibit the growth from hail embryos into hail effectively, and the effectiveness of the hail suppression work can be better validated through the observing polarized radar parameters.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.