Improved Algorithms for Removing Isolated Non-Meteorological Echoes and Ground Clutters in CINRAD

查看全文 作　　者：Haibo [1,2,3]ZOU;Shuwen [1]ZHANG;Xudong [2]LIANG;Xueting [3]YI

机构地区：[1]College of Atmosphere Sciences,Lanzhou University,Lanzhou 730000;[2]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081;[3]Meteorological Disaster Emergency Warning Center of Jiangxi Province,Nanchang 330046

出　　处：《Journal of Meteorological Research》索引2018年第32卷第4期,共14页

基　　金：Supported by the Jiangxi Provincial Department of Science and Technology project(20171BBG70004);Open Project of the State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences(2016LASW-N11);National Natural Science Foundation of China(41575098) 摘　　要：Using China New Generation Weather Radar(CINRAD) level-II data, the original algorithms for removing isolated non-meteorological echoes and ground clutters in radar data, which have been applied to Weather Surveillance Radar-1988 Doppler(WSR-88 D) in the USA and Severe Weather Automatic Nowcast(SWAN) system in China, are modified and improved. To remove isolated non-meteorological echoes, the new algorithm introduces a constraint parameter(Po) to distinguish whether a window of 5 × 5 points is isolated as external echoes. A statistical analysis of150 radar scans(5 cases, with each case comprising 30 scans) under three different echo types(small-scale convection, typhoon, and large-scale synoptic system) shows that the constraint parameter Po ≤ 0.167 is suitable for removing isolated non-meteorological echoes while preserving the edge of meteorological echoes. A new parameter, NDZ,which promotes the ability of the algorithm to identify the ground clutters appearing at two adjacent elevation angles,is constructed based on the vertical continuity of reflectivity. These improved algorithms are tested for four cases(three cases of isolated non-meteorological echoes and one case of ground clutters). Based on the statistics of 232 volume scans of radar data(on a temporal resolution of 1 h) measured at Nanchang station from 0000 UTC 5 to 1600 UTC 14 March 2015, it is found that the improved algorithms not only eliminate most(over 95% under clear-sky conditions) of the isolated non-meteorological echoes and ground clutters(including those appearing at two adjacent elevation angles), but also well preserve the structure of meteorological echoes(storms). 关键词：CINRAD 改进算法气象学孤立地面新一代天气雷达雷达数据限制参数

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Improved Algorithms for Removing Isolated Non-Meteorological Echoes and Ground Clutters in CINRAD

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