基于激光雨滴谱仪的C波段天气雷达回波衰减订正方法研究  

Research on correction method of C band weather radar reflectivity attenuation based on laser optical distrometer

作　　者：郭海平[1] 王磊[2] 衡志炜[2] Guo Haiping;Wang Lei;Heng Zhiwei(Inner Mongolia Atmosphere Sounding Technology Support Center,Huhhot 010051,China;Chengdu Institute of Plateau Meteorology,CMA/Heavy Rain and Drought-Flood Disaster in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072,China)

机构地区：[1]内蒙古自治区大气探测技术保障中心,呼和浩特010051 [2]中国气象局成都高原气象研究所/高原与盆地暴雨旱涝灾害四川省重点实验室,成都610072

出　　处：《电子测量技术》2020年第14期60-68,共9页Electronic Measurement Technology

基　　金：高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金(SCQXKJQN2019009);高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金局校合作基金(SCJXHZ05);成都市科技专项(2018-ZM01-00038-SN);四川省科技厅重大科技专项(19ZDYF0738)。

摘　　要：通过雷达气象方程推导C波段天气雷达回波衰减率k与雷达反射率因子Z之间的指数关系。联合利用激光雨滴谱仪、雨量计和天气雷达实况数据,反演不同季节、温度和雨滴谱类型条件下k^Z关系的a,b系数。根据不同降水类型选择合适的k^Z关系进行自适应的C波段天雷达回波逐库累积衰减订正。使用2017~2018年内蒙古自治区呼和浩特市C波段天气雷达实况探测数据和土默特左旗、托克托县、和林格尔县以及武川县4站激光雨滴谱仪观测数据深入分析该地区不同降水类型条件下的k^Z关系。选取发生在呼和浩特的一次典型强对流降水过程C波段天气雷达探测数据进行雷达回波衰减订正,并与地面雨量站数据进行误差对比实验分析。实验结果表明:使用所提的衰减订正方法获取的雷达反射率因子值,无论在径向距离方向上还是在垂直高度方向上,其均方根误差远小于传统衰减订正方法。综上所述,基于激光雨滴谱仪的C波段天气雷达回波衰减订正方法总体订正效果优于传统衰减订正方法,该方法可以进一步推广应用到其他地区。The relationship between the C band weather radar reflectivity attenuation rate k and radar reflectivity factor Z is derived using radar meteorological equations.Laser disdrometer,rain gauge and weather radar sounding data were combined for retrieving k-Z relationship coefficients a and b under different season,temperature and raindrop size distribution types conditions,respectively.Appropriate k^Z relationship is selected for database-by-database accumulative attenuation correction of adaptive C band weather radar reflectivity according to different precipitation types.The C band weather radar sounding data in Hohhot Inner Mongolia and four laser optical distrometer data in Tumed left banner,Togtoh county,Horinger county and Wuchuan County from 2017 to 2018 were used to analyze the k-Z relationship under different precipitation types in this region.The C band weather radar sounding data of a typical severe convective precipitation process in Hohhot was selected for reflectivity attenuation correction.We carry out error experimental analysis which the revised data were compared with the rain gauge data.The experimental results show that the RMS error of radar reflectivity obtained by the attenuation correction method in this paper is more less than that of the traditional attenuation correction method in both radial distance and vertical altitude.In conclusion,the proposed method's correction effect for C band weather radar reflectivity attenuation is better than those of traditional attenuation correction methods,which may enable further popularization and application.

关 键 词：C波段天气雷达 衰减订正 激光雨滴谱仪 雷达反射率因子 

分 类 号：TP722.6[自动化与计算机技术—检测技术与自动化装置]