摘要
为了进一步了解江西冰雹产生的雷达回波系统和这些回波系统与雷电分布之间的关联,使用雷达拼图资料和雷电分布等资料,对2025年4月江西出现的三次冰雹天气过程进行分析。结果表明:中尺度云团演变为冷锋回波带造成的闪电活动比较明显,尤其是CR在50~55 dBZ、VIL≥30 kg/m 2的雷暴回波单体上,表现更为显著;西南倒槽短带回波演变为冷锋回波带的关键特征:回波呈现西北-东南走向的短带回波,结构较松散,向东北移动,移速缓慢,降水分布不均。演变为冷锋回波带后结构紧密,闪电更为密集,回波带上超级单体出现冰雹、雷暴大风和短时强降水;850 hPa切变线动力触发产生多条平行或断续的雷暴回波带,CR≥55 dBZ,并伴有≥60 dBZ的超级单体,VIL在40 kg/m 2,超级单体可达70 kg/m 2。上述研究结果为江西强对流天气的雷电活动和雷达回波的预警预报提供了分析依据。
In order to to further understand the radar echo systems responsible for hail formation in Jiangxi and the correlation between these echo systems and lightning distribution,radar mosaic data and lightning distribution data were utilized to analyze three hail weather processes that occurred in Jiangxi in April 2025.The results indicate that the evolution of mesoscale cloud clusters into cold front echo bands leads to significant lightning activity,especially in thunderstorm echo cells with CR(Convectional Readiness)values between 50-55 dBZ and VIL values greater than or equal to 30 kg/m 2.The key characteristic of the evolution from southwest trough short-band echoes to cold front echo bands is the emergence of northwest-to-southeast oriented short-band echoes with a relatively loose structure,moving northeastward at a slow speed,and resulting in uneven precipitation distribution.After evolving into cold front echo bands,the structure becomes tighter,lightning becomes more dense,and hail,thunderstorm winds,and short-duration heavy precipitation occur in supercells on the echo bands.The 850 hPa shear line dynamically triggers the generation of multiple parallel or intermittent thunderstorm echo bands with CR values greater than or equal to 55 dBZ,accompanied by supercells with CR values greater than or equal to 60 dBZ and VIL values between 40 kg/m 2 and up to 70 kg/m 2.The aforementioned research findings provide an analytical basis for early warning and forecasting of lightning activity and radar echoes in severe convective weather in Jiangxi.
作者
杜江
夏侯斌
黄小红
Du Jiang;Xiahou Bin;Huang Xiaohong(Key Laboratory of Ecological Meteorology of Ji'an City,Ji'an 343000;Ji'an Meteorological Bureau,Ji'an 343000)
出处
《气象水文海洋仪器》
2025年第6期29-33,共5页
Meteorological,Hydrological and Marine Instruments
基金
吉安市生态气象重点实验室开放式研究项目(2021JEM204)
吉安市生态气象重点实验室开放式研究基金项目(2020JEM101)资助。
关键词
江西冰雹
雷电分布
冷锋回波带
Jiangxi hail
lightning distribution
cold front echo band
