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。
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 ZH-ZDR are given out,and can be expressed as a piecewise function,from which the hail parameters HDR are derived.If HDR 0,then there is hail,and if HDR0,it means no hail.It is also pointed that the attenuation of electromagnetic waves can affect the results of HDR hail identification.By comparing the relations between HDR and the ground-observation hail data,the preliminary results have shown that the HDR above zero region is in good agreement with hail on the ground.
出处
《气象》
CSCD
北大核心
2011年第10期1228-1232,共5页
Meteorological Monthly
基金
国家自然科学基金项目(40930949)
北京市气象局项目(2010BMBKYZX03)共同资助
