中文摘要：

以北京市平谷区2011年6月11日防雹作业为例,利用双线偏振雷达资料,选取与作业区条件十分接近的云块为对比区,根据回波移动方向和速度,跟踪分析在不同高度上防雹作业前后云体宏观结构特征和粒子相态等微物理变化过程。作业后云体所呈现特征为：1作业区的云顶高度、强回波中心高度迅速下降,对比区变化不明显;2作业区水平反射率Zh减小,差分反射率Zdr、零相关系数ρhv增大,单位差分传播相移Kdp小范围内波动,对比区Zh、Zdr、Kdp变化不明显;ρhv增大;3作业区对流减弱,高层较大冰雹粒子、大雨滴下沉明显,最终以霰粒子为主;而对比区域则对流仍然旺盛,冰雹粒子有增多趋势。以上特征表明防雹作业可有效抑制冰雹胚胎成长为冰雹的过程,通过偏振雷达观测参量可对防雹作业效果进行较好的验证。

英文摘要：

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 11June2011.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 Zdrand zero correlation coefficientρhv increased with decreasing horizontal reflectivity Zhand differential propagation phase shift Kdpfluctuated in small scope.In the control area,ρhvalso increased but the variation of Zh、Zdrand Kdpwere 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.