一次强飑线过程多尺度回波系统特征分析  

Evolution of multi-scale echo system during a strong squall line process

作　　者：李嘉 马中元[2] 郑媛媛 段和平 夏雪 LI Jia;MA Zhongyuan;ZHENG Yuanyuan;DUAN Heping;XIA Xue(Jiangxi Meteorological Disaster Prevention Technology Center,Nanchang 330046,China;Jiangxi Institute of Meteorological Sciences,Nanchang 330046,China;Nanjing Joint Institute for Atmospheric Sciences,Nanjing 210041,China)

机构地区：[1]江西省气象灾害防御技术中心,南昌330046 [2]江西省气象科学研究所,南昌330046 [3]南京气象科技创新研究院,南京210041

出　　处：《气象科学》2022年第5期622-630,共9页Journal of the Meteorological Sciences

基　　金：国家重点研发计划专项项目(2018YFC1507503);国家自然科学基金资助项目(41575036);江西省气象局科研项目(JX2020Z07)。

摘　　要：采用自动气象站观测资料、MICAPS天气图、江西二维和三维雷电数据和江西WebGIS雷达拼图等多源资料,分析了2021年5月10—11日江西强飑线天气过程的回波系统特征。结果表明,当江西处于500 hPa槽前、100 hPa出流区、850 hPa切变线和西南急流和925 hPa西南倒槽之中,有利于出现冰雹、雷暴大风、强雷电等天气;一次飑线过程有若干个不同尺度回波系统过程,中尺度对流回波系统、局地热对流雷暴回波、雷暴回波群、A飑线回波带、辐合线雷暴回波带、B飑线回波带等多尺度回波系统;直径d≤2 cm的冰雹发生在组合反射率(Composite Reflectivity,CR)回波强度超过60 dBZ并且强回波面积超过100 km~2的回波中,当CR强度超过65 dBZ并且强回波面积超过300 km~2时,容易出现d≥5 cm的大冰雹。Using the observation data of automatic weather station,MICAPS weather map,Jiangxi two-dimensional and three-dimensional lightning data and Jiangxi WebGIS radar mosaic,the evolution of echo system of Jiangxi strong squall line weather process from May 10 to 11,2021 is analyzed.The results show that when Jiangxi is located in front of the 500 hPa trough,100 hPa outflow area,850 hPa shear line and southwest jet stream,925 hPa southwest inverted trough,it can be conducive to the occurrence of hail,thunderstorm,gale,strong lightning and other extreme weather.A squall line process has several different multi-scale echo system processes,including mesoscale convective echo system,local geothermal convective thunderstorm echo,thunderstorm echo group.‘A squall line’ echo zone,convergence line thunderstorm echo zone,‘B squall line’ echo zone and so on;Hail(d≤2 cm) occurs when the echoes with composite reflectivity(CR) echo intensity exceeding 60 dBZ and strong echo area exceeding 100 km~2 is detected,and large hail(d≥5 cm)is prone to occur,when CR intensity more than 65 dBZ and strong echo area exceeds 300 km~2.

关 键 词：强飑线 多尺度回波系统 回波演变 回波特征 

分 类 号：P458.2[天文地球—大气科学及气象学]