摘要
针对四川省复杂地形和雷达型号多样的特征,设计了一种以长时间序列统计单/双偏振天气雷达数据质量的评估方法,算法定性评估了天气雷达数据是否存在空回波、电磁干扰和地物干扰的问题,定量评估了雷达Zh(水平极化反射率因子)、Z_(dr)(差分反射率)、CC(相关系数)、Фdp(差分相移)和G_(C)(地物回波系数)的数据质量。通过评估2022年5—9月四川省12部新一代天气雷达基数据的数据质量,得到了如下结果:(1)同频电磁干扰严重影响四川省天气雷达数据质量,超过74%的宜宾和广元站数据存在电磁干扰回波;宜宾和乐山雷达站出现了较多空回波数据;超过77.91%的广元雷达站数据存在风电场地物回波干扰。(2)雷达性能正常时,地物回波系数G_(C)的均值变化不大,G_(C)系数的标准差可以有效反应出雷达数据问题,特别对空回波数据问题比较敏感。(3)四川省12部天气雷达Zh标准差总体较小,绵阳和宜宾站较优,乐山站较差。(4)四川省3部双偏振天气雷达的Z_(dr)和CC数据质量较好,?dp的数据波动较大。
Aiming at the characteristics of complex terrain and the variety of radar types in Sichuan Province,this paper designs an algorithm for evaluating the quality of single or dual-polarization weather radar data over a long period of time.The algorithm qualitatively evaluates whether the weather radar data have the error of Empty Echo,electromagnetic interference or ground object clutters,and quantitatively evaluates the data quality of reflectivity factor(Z_(h)),differential reflectivity(Z_(dr)),coefficient of correlation(C_C),differential phase shift(Ф_(dp))and ground object clutter(G_C).By evaluating the data quality of 12 new-generation weather radars in Sichuan Province from May to September 2022,the following results are obtained:(1)The weather radar in Sichuan Province is affected by electromagnetic interference,which seriously affects the data quality.More than 74%of the Yibin and Guangyuan radar data have electromagnetic interference echoes.The data of Yibin and Leshan radar stations have many error data of“Empty Echo”.More than 77.9%of the Guangyuan radar data have ground object echo interference that is caused by wind turbines.(2)If the radar performance is normal,the mean value of the ground object clutter coefficient G_(C)does not change much.The standard deviation of G_(C)coefficient can effectively reflect the problem of radar data,especially the problem of“Empty Echo”data.(3)The standard deviation of Z_(h)in the 12 weather radars in Sichuan Province is generally small,and the standard deviation of Z_(h)in Ya'an,Kangding and Guangyuan stations is better than that of others.(4)The quality of Z_(dr)and C_C data of 3 dual-polarization weather radars in Sichuan Province is optimum,but the data quality ofФ_(dp)is poor.
作者
谢晓林
杨泷
董元昌
郑伟
彭涛
景号然
XIE Xiaolin;YANG Long;DONG Yuangchang;ZHENG Wei;PENG Tao;JING Haoran(Meteorological Observation Data Center of Sichuan Province,Chengdu 610o72;Sichuan Meteorological Observatory,Heavy rain and Drought-Flood Disaster in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072;Sichuan Branch of Meteorologist Training Institute,CMA,Chengdu 610072)
出处
《气象科技》
2023年第3期346-355,共10页
Meteorological Science and Technology
基金
国家自然科学基金项目(41875036)
国家重点研发计划(2018YFC1507400)资助。
关键词
双偏振雷达
数据质量
标准差
dual-polarization radar
data quality
standard deviation
