气象2025，Vol.51Issue(5)：595-606,12.DOI:10.7519/j.issn.1000-0526.2024.122703
宁夏六盘山区一次局地特大冰雹的雷达观测特征
Radar Observation Characteristics of a Local Outsize Hail in Liupan Mountains,Ningxia
摘要
Abstract
Based on the observation data by Guyuan C-band Doppler weather radar and X-band dual polari-zation radar,combined with ERA5 hourly reanalysis data,Himawari-8 satellite images and conventional observation data,we analyze the causes and radar observation characteristics of a local outsize hail(diame-ter≥5 cm)which occurred in Liupan Moutains of Ningxia on 12 July 2021.The results show that the su-percell storm formed by the merger and development of multicell storm led to the occurrence of outsize hail.The mesoscale surface convergence line,mesoscale cyclone and local circulation in Liupan Moutains were the main triggering and enhancing systems of mesoscale convective system(MCS),and also affected the moving direction of MCS.When the large hail occurred,the C-band radar reflectivity factor(Z)65 dBz,three-body scatter spike(TBSS)length≥20 km,and vertically integrated liquid water content(VIL)≥40 kg·m-2.The correlation coefficient(CC)in the high-value zone of the low layer horizontal reflectivity(ZH)of X-band radar was less than 0.8,and the differential reflectivity(ZDR)and specific dif-ferential phase(KDP)of the mid-and high-layers ZH high-value zone were negative with CC＜0.8.When the outsize hail occurred,Z≥70 dBz,TBSS length ≥ 30 km and VIL ≥ 50 kg·m-2 for the C-band radar.CC in the low layer ZH high-value zone of the X-band radar was less than 0.6,and the"hole"formed in the area with CC＜0.5,was useful to identify the area and altitude of outsize hail in the air.ZDR columns and CC rings near the bounded weak echo zone could indicate the position of strong updrafts in the middle and upper layers of supercell storm.So,ZH and dual polarization parameter characteristics have good indicative significance for the identification and warning of hails in different sizes.关键词
特大冰雹/雷达观测特征/超级单体/双偏振参量/六盘山Key words
outsize hail/radar observation characteristic/supercell/dual polarization parameter/Liupan Mountains分类
大气科学引用本文复制引用
余文梅,陈豫英,马国涛,牛建军,杨苑,李向栋..宁夏六盘山区一次局地特大冰雹的雷达观测特征[J].气象,2025,51(5):595-606,12.基金项目
宁夏自然科学基金项目(2024AAC03414)、宁夏重点研发计划(2024BEG02034)、宁夏科技创新领军人才(2021GKLRLX05)、宁夏智能数字预报技术研究与应用科技创新团队(2024CXTD006)和中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室开放研究项目(CAMF-202315)共同资助 （2024AAC03414）
