【摘要】 利用北京市人工影响天气办公室X波段双线偏振雷达2009年4—10月观测的不同降雨类型的资料,统计出下雨天Z_H—Z_DR的分布特征,给出了Z_H-Z_DR分布的分段函数表达式,在此基础上定义了X波段双线偏振雷达冰雹识别参量H_DR,H_DR>0表示有冰雹,H_DR<0表示无冰雹,并指出电磁波的衰减会影响H_DR识别冰雹的结果。根据实际降雹情况和识别效果对比,结果表明H_DR大于零的区域与地面降雹情况基本对应一致。更多还原

【Abstract】 Based on the Beijing Weather Modification Office X-band dual polarization radar’s observations of different types of rainfall in April to October 2009,the characteristics of raindrop size distribution of Z_H-Z_DR are given out,and can be expressed as a piecewise function,from which the hail parameters H_DR are derived.If H_DR>0,then there is hail,and if H_DR<0,it means no hail.It is also pointed that the attenuation of electromagnetic waves can affect the results of H_DR hail identification.By comparing the relations between H_DR and the ground-observation hail data,the preliminary results have shown that the H_DR above zero region is in good agreement with hail on the ground.更多还原