毫米波云雷达距离旁瓣回波质量控制及效果评估  

Quality Control and Effect Evaluation of Range Sidelobe Echo of Millimeter Wave Cloud Radar

作　　者：曾正茂 郑佳锋 吕巧谊 杨晖[1] 蔡艺友 ZENG Zhengmao;ZHENG Jiafeng;LYU Qiaoyi;YANG Hui;CAI Yiyou(Fujian Meteorological Information Center,Fuzhou 350001;Laboratory of Straits Meteorology,Xiamen Meteorological Bureau,Xiamen 362012;Fujian Key Laboratory of Severe Weather,Fuzhou 350001;Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225;Pinghe Weather Station,Zhangzhou of Fujian 363700)

机构地区：[1]福建省气象信息中心,福州350001 [2]厦门市气象局海峡气象开放实验室,厦门362012 [3]福建省灾害天气重点实验室,福州350001 [4]成都信息工程大学大气科学学院,高原大气与环境四川省重点实验室,成都610225 [5]平和县气象局,福建漳州363700

出　　处：《气象》2022年第6期760-772,共13页Meteorological Monthly

基　　金：福建省气象局开放式科研基金项目(2020KX05);国家重点研发计划(2018YFC15057027);成都信息工程大学人才引进项目(KYTZ201728)共同资助。

摘　　要：根据福建省平和县布点的毫米波云雷达实际性能特点,且针对业务运行出现的距离旁瓣回波问题,提出了改进的质量控制方法;并利用福建平和站2018年9月至2020年8月的观测资料,定量评估质量控制效果对云-降水探测的具体影响。结果表明:提出的质量控制方法能较好改善雷达探测结果,距离旁瓣回波被有效滤除。距离旁瓣回波显著影响雷达对空中云雨回波的探测,影响最大集中在两个宽脉冲模式的盲区以上起始高度附近,即1.50~2.28 km和3.63~7.74 km,且距离旁瓣回波出现频次随高度上升而逐渐下降;距离旁瓣回波主要会干扰雷达对中低空弱云的探测,会导致云底被低估、云顶和云厚被高估,三个云参数的平均误差分别可达-0.53、0.74和0.73 km。According to the actual performance characteristics of the millimeter wave cloud measuring radar in Pinghe Area of Fujian Province,and in response to the problem of range sidelobe artifacts in operation,an improved data quality control method is proposed.Using the observation data in Pinghe of Fujian Province from September 2018 to August 2020,the quality of the radar is quantitatively evaluated to study the actual impact of data quality control on cloud-precipitation detection.The results show that the proposed method can well improve the radar detection measurements,and the range sidelobe artifacts can be effectively filtered.The range sidelobe also significantly affect the radar’s detection of airborne cloud and rain echoes.The impact is most concentrated near the starting height above the blind zone of the two wide pulse modes,namely 1.50-2.28 km and 3.63-7.74 km,and the frequency of range sidelobe artifact decreases as altitude increases.The range sidelobe artifact mainly interferes with radar detection of low and medium level weak clouds,thus leading to underestimation of cloud base and overestimation of cloud top and cloud thickness.The average errors of three cloud parameters can reach-0.53、0.74 and 0.73 km respectively.

关 键 词：毫米波云雷达 距离旁瓣回波 质量控制 评估 

分 类 号：P415.2[天文地球—大气科学及气象学]