X波段双偏振多普勒天气雷达降雨估算试验

用X波段双偏振多普勒天气雷达和RG3-M型自动采集翻斗式雨量计,经过严格科学设计,在平凉野外布置试验场,采用与天气系统移动方向一致的两次层积云资料,验证X波段双偏振多普勒天气雷达的测雨能力。试验表明:雷达原始数据滤波处理的好坏直接影响降雨估算精度的高低,特别是对R(Kdp)和R(Kdp,Zdr)影响明显,滤波后数据点的空间平滑是必要的;发展了用雨量计反演雷达测雨参数方法,此方法改进了不同地区、不同雨滴谱分布情况下雷达定量测雨能力;同时表明X波段雷达受降雨衰减的影响比较严重,这些试验结果可作为下一代测雨天气雷达的重要参考依据。

Experiment of Rainfall Estimation Using X-Band Dual-Polarized Doppler Weather Radar

Using X-band dual-polarized Doppler Weather Radar and RG3-M automatic gathering rain gage,two that had consistent moving direction were observed in the strictly and scientifically designed Pingliang field experiment.We make use of the data testing the ability of radar rainfall estimation.The experimental results indicated that the filtering of raw radar data will affects the radar accuracy of rainfall estimation directly,and especially obvious for R(Kdp) and R(Kdp,Zdr).And after filtering,the further spatial smoothing of data is necessary.We developed a measuring method which retrieves radar rainfall estimation parameters using gage,this method improved the radar ability to measure rainfall in different districts and raindrop size distribution situations;simultaneity showed that the partial attenuation effects at X-band are very severe.The experimental result may be taken as an important reference for the next generation rainfall radar.