河北省双线偏振雷达数据质量分析和衰减订正  

Data quality analysis and attenuation correction of dual-linear polarimetric radar in Hebei

作　　者：范根昌[1] 樊嵘 王梧熠 FAN Genchang;FAN Rong;WANG Wuyi(Weather Modification Office of Hebei Province,Shijiazhuang 050021,China)

机构地区：[1]河北省人工影响天气办公室,石家庄050021

出　　处：《气象科学》2021年第2期278-284,共7页Journal of the Meteorological Sciences

基　　金：河北省气象局科研开发项目(17ky13);河北省气象局科研开发项目(18ky19)。

摘　　要：选取河北邢台X波段双线偏振全固态多普勒雷达观测到的典型降水过程资料,分析了偏振参量的数据质量及系统稳定性,用ΦDP对Z H和Z DR进行了初步的衰减订正,并对订正结果进行了评估。结果表明,724XSP双偏振雷达初始相位ΦDP(0)随仰角、方位的变化都是较为稳定的,波动较小。分析垂直扫描数据,发现Z DR和CC能较好地反映降水粒子的实际情况。信噪比是影响偏振数据质量的重要因素,当信躁比大于15 dB时,Z DR、CC随信噪比变化比较平稳,数据质量可信度较高。双偏振雷达反射率因子衰减订正后与S波段雷达的拟合效果更好,相关系数为0.78,订正后Z DR-Z H散点分布更接近散射模式计算出的理论结果,说明订正效果好。Based on the typical precipitation process data observed by an X-band dual-linear polarimetric all-solid-state doppler radar in Xingtai,the data quality and system stability of polarization parameters were analyzed.Then,the attenuation of Z H and Z DR were preliminarily corrected viaΦDP,and the corrected results were evaluated.Results indicate that the initial phaseΦDP(0)of 724XSP dual-linear polarization radar along with the change of elevation angle and azimuth are relatively stable.The analysis of vertical scanning data indicates that Z DR and CC can better reflect the actual situation of precipitation particles.Signal-to-Noise Ratio(SNR)is an important factor that affects the quality of polarization radar data.When SNR reaches 15.0 dB or above,Z DR and CC change smoothly with SNR,and the radar data is credible.The attenuation correction result of dual polarization radar reflectivity factor is more similar to S-band radar.The correlation coefficient R is 0.78 and the distribution of Z DR-Z H scatter points is closer to the theoretical results calculated by the scattering model after correction,indicating a good correction effect.

关 键 词：X波段双线偏振多普勒雷达 资料质量分析 衰减订正 

分 类 号：P412.25[天文地球—大气科学及气象学]