天顶扫描模式在双偏振天气雷达Zdr系统偏差订正中的应用  

Application of vertical scanning mode in the correction of Zdr system bias of dual polarization weather radar

作　　者：胡汉峰[1,2] 楚志刚 魏鸣[1] HU Hanfeng;CHU Zhigang;WEI Ming(Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science&Technology,Nanjing 210044,China;Weather Radar Technical Innovation Team of Meteorological Observation Centre of China Meteorological Administration,Beijing 100081,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室,南京210044 [2]中国气象局气象探测中心天气雷达技术创新团队,北京100081

出　　处：《气象科学》2019年第5期599-607,共9页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41675029);国家重点基础研究发展计划(973计划)项目(2013CB430100)

摘　　要：双偏振天气雷达Zdr系统偏差是影响雷达数据质量的关键因素,本文利用南京信息工程大学C波段双偏振天气雷达,对90°仰角天顶扫描数据在Zdr系统偏差订正中的应用进行了分析,同时增加90°仰角定点观测模式,讨论并确认了方位旋转关节对Z dr测量结果的影响,在双偏振天气雷达雷达Z dr系统偏差订正中加入了方位旋转关节因素。研究结果表明:选择合适的90°仰角数据,不仅可以对接收双通道不一致造成的Z dr固定系统偏差进行订正,还能够进一步检测由方位旋转关节衰减不同引起的误差;利用90°仰角数据对Z dr的系统偏差进行订正,稳定性和精度较高,满足双偏振天气雷达Z dr精度要求。Z dr system offset of dual polarization weather radar is the key factor affecting the quality of radar data.In this paper,the data of 90°elevation collected by the radar of Nanjing University of Information Science and Technology is used to analyzed the application of vertical scanning in the correction of Z dr system offset.And this paper increases the 90°elevation fixed observation mode,discusses and confirms the influence of azimuth rotation joint on the Z dr measurement,and adds the azimuth rotation joint factor to the correction of the dual polarization weather radar Z dr system offset.The results show that choosing the appropriate 90°elevation data,can not only correct the fixed Z dr system offset caused by the inconsistent between the dual receive channels,also possibly detect the errors caused by the inconsistency of the azimuth rotation joints.Using the 90°elevation data,the system bias of Z dr is corrected stably and accurately,which can meet the accuracy requirements of Z dr for dual polarization weather radar.

关 键 词：天顶扫描 双偏振雷达 Zdr偏差 订正 

分 类 号：P412.5[天文地球—大气科学及气象学]