基于雷达观测的中-γ尺度对流云人工催化效果检验方法的个例研究

Case Study on the Test Method of Artificial Seeding Effect for Meso-γ Scale Convective Cloud Based on Radar Observation

利用北京SA波段天气雷达每6 min一次的体扫数据,采用非参数检验方法,对2015年8月23日一次局地新生的中-γ尺度对流云人工催化效果的检验方法进行了探索。结果表明:将与作业单元条件相似的所有对流单元作为对比回波,并运用非参数检验方法进行作业效果检验,对于此类生消快速的小尺度对流云作业效果的检验是适合的;表征回波发展特点的最大组合反射率、平均组合反射率、回波面积3个物理量的作业回波衰减率都明显小于对比回波的,即作业云的生命周期明显大于自然云的,表明本次作业延缓了云的衰减,对延长对流云生命周期、维持云系发展起到积极作用。

In this paper, test method of artificial seeding effect was studied based on an artificial catalytic ground work carried out in the Pinggu region of Beijing on August 23,2015 and the volume scan data per 6 min from the Beijing SA-band weather radar, seeding object was a local nascent meso-γ scale convective cloud. The results showed it was appropriate that all units similar with work unit convection conditions was considered to contrast unit, and the non-parameter test method was used for effect test of small-scale convective cloud with short duration. For the maximum composite reflectivity, average composite reflectivity and echo area, the attenuation rate was obviously lower than contrast echo, so the work cloud life cycle is significantly larger than the natural cloud＇ s,which indicated that the artificial seeding work had played an positive role in retarding attenuation, extending life cycle and maintaining develop- ment of the convective cloud.