X波段天气雷达避雷针对偏振产品的影响  

Impact of X-band weather radar lightning rod on polarization products

作　　者：兰杰 储晨曦 周红根 Lan Jie;Chu Chenxi;Zhou Honggen(Jiangsu Meteorological Observation Center,Nanjing 210009;CMA.Key Laboratory of Atmospheric Sounding,Chengdu 610255)

机构地区：[1]江苏省气象探测中心,南京210009 [2]中国气象局大气探测重点开放实验室,成都610225

出　　处：《气象水文海洋仪器》2024年第6期5-8,共4页Meteorological,Hydrological and Marine Instruments

基　　金：江苏省气象局科研基金项目(KQ202309);中国气象局大气探测重点开放实验室开放课题(2022KLAS03M、U2021Z10)资助。

摘　　要：为进一步提高双偏振雷达数据质量,将兴化X波段双偏振天气雷达站对角避雷针更换为新工艺小尺径避雷针,并评估了对差分反射率和差分相移的影响,对大丰X波段双偏振雷达4根相同材质避雷针进行影响分析。通过筛选天气过程和提取雷达数据,分析了两次天气过程中两部雷达的观测数据。结果表明:避雷针对偏振量的影响方位分布固定在4个角度范围内,实际对应避雷针所在的方位,且差分反射率、差分相移受到避雷针影响随方位的变化趋势较为一致,其中避雷针对差分相移的影响较差分反射率更明显;更换了避雷针的方位后影响减小,其中避雷针对差分反射率的影响为0.1~0.2 dB,对差分相移的影响为2°~3°。希望研究结果能为评估兴化X波段雷达不同材质避雷针的影响提供参考。To further improve the data quality of dual polarization radar,the diagonal lightning rod of Xinghua X-band dual polarization weather radar station was replaced with a new process small-sized lightning rod,and the impact on differential reflectivity and differential phase shift was evaluated.An impact analysis was conducted on four lightning rods of the same material for Dafeng X-band dual polarization radar.By filtering weather processes and extracting radar data,the observation data of two radars during two weather processes were analyzed.The results show that the impact of lightning protection on polarization is distributed within a fixed range of four angles,corresponding to the actual orientation of the lightning rod.The differential reflectivity and differential phase shift are affected by the lightning rod and have a consistent trend with the orientation.Among them,the impact of lightning protection on differential phase shift is more significant than that on differential reflectivity.After changing the orientation of the lightning rod,the impact was reduced,with lightning protection affecting differential reflectivity was 0.1 dB to 0.2 dB and differential phase shift was 2°to 3°.It is hoped that the research results can provide reference for evaluating the impact of different materials of lightning rods on Xinghua X-band radar.

关 键 词：X波段天气雷达 避雷针 差分反射率 差分相移 

分 类 号：P412[天文地球—大气科学及气象学]