基于雨滴谱仪和S波段雷达的X波段相控阵雷达反射率观测质量定量分析

Quantitative Analysis of Reflectivity Quality of X-Band Phased-Array Radar Based on Disdrometer and S-Band Radar

使用深圳市求雨坛X波段相控阵雷达数据,与深圳市竹子林雨滴谱仪数据和深圳市求雨坛S波段雷达数据进行了定量对比,分析X波段相控阵雷达反射率的观测质量。结果表明,整体而言X波段相控阵雷达反射率与雨滴谱仪计算得到的反射率及S波段雷达反射率均较为一致,相关系数均超过0.75,相对平均误差接近于0,不存在明显偏差,且在不同强度降水时段表现较为稳定。但X波段雷达反射率在不同强度下偏差情况不一致,小于25 dBz时,X波段相控阵雷达反射率偏强,大于25 dBz时,X波段相控阵雷达反射率偏弱,且偏弱程度随反射率强度增加逐渐加大,在反射率超过50 dBz时,平均偏弱强度可达8~10 dB。

The observation quality of reflectivity of Shenzhen Qiuyutan X-Band Phased-Array Radar is quantitatively evaluated by comparing it to Shenzhen Zhuzilin Disdrometer data and Shenzhen Qiuyutan S-Band Radar data.The results suggest that the reflectivity of X-band phased-array radar is highly consistent with the reflectivity retrieved by disdrometer and observed by S-band radar,with correlation coefficients greater than 0.75 and relative mean biases close to 0,which indicates minimal deviation.The X-band phased-array radar also shows stable performance under different rain intensity periods.However,the deviation of reflectivity of X-band phased-array radar is different under different reflectivity intensities.The reflectivity of X-band phased-array radar is positively biased when reflectivity is under 25 dBz,and negatively biased otherwise.As reflectivity intensifies,the degree of the negative bias gradually increases,and the average bias of reflectivity can reach 8-10 dB when reflectivity exceeds 50 dBz.