气象2026，Vol.52Issue(8)：986-998,13.DOI:10.7519/j.issn.1000-0526.2025.112401
S波段双偏振天气雷达旁瓣回波特征分析
Analysis of Sidelobe Echo Characteristics of S-Band Dual-Polarization Weather Radar
摘要
Abstract
To conduct a quantitative study on the sidelobe echoes of the S-band dual-polarization weather radar,based on the plan position indicator(PPI)data of five SAD-type doppler dual-polarization weather radars in Changsha,Chenzhou,Changde,Xiangxi and Huaihua in Hunan Province from 2021 to 2025,445 sidelobe echo samples were manually screened in this study.On this basis,a numerical matrix was con-structed and the values of sidelobe echoes from four types of products were extracted,including horizontal polarization reflectivity(ZH),differential reflectivity(ZDR),correlation coefficient(CC),and specific differential phase(KDP).Statistical analysis was conducted on the spatial distribution characteristics of sidelobe echoes and the average value characteristics of various products.The results show that the side-lobe echoes are evenly distributed in the east-west direction,with fewer echoes in the south and more in the north,in the radar polar coordinate system.The areas with the highest occurrence frequency of side-lobe echoes are concentrated in the range from the radar static cone area to 100 km and at the melting layer height of 3.0-4.0 km.The sidelobe echoes mainly appear within the range of±6 km in radial distance from the high echo core and 4°—40° in azimuth,and the highest frequency is located at the same radial dis-tance as the high echo core and 12°—13° azimuth on the lateral side.The sidelobe echoes have significant low-value characteristics in radar polarization parameters.75％of the sidelobe echoes exhibit ZH≤ 8.0 dBz,ZDR≤ 0.56 dB,and CC≤0.92,with ZH most frequently occurring in 0-5 dBz,ZDR in 0-1 dB,and CC in 0.9-1.0.Although the low values of polarimetric radar variables in sidelobe echoes are distinct,26.0％of the samples with azimuthal spans ≥30° exhibit a terminal ZDR≥ 5 dB.The research results are conducive to improving the identification efficiency of sidelobe echoes and are a valuable basis for future's automatic identification of sidelobe echoes.关键词
旁瓣回波/双偏振天气雷达/冰雹Key words
sidelobe echo/dual-polarization weather radar/hail分类
天文与地球科学引用本文复制引用
桑友伟,孟蕾,谭佳,唐佳,龙敏..S波段双偏振天气雷达旁瓣回波特征分析[J].气象,2026,52(8):986-998,13.基金项目
中国气象局气象干部培训学院重点项目(2025CMATCZDIAN21)和湖南省气象局2024年创新发展专项(CXFZ2024-FZZX46)共同资助 （2025CMATCZDIAN21）
