摘要
使用MICAPS资料、江西强天气监测数据、江西WebGIS雷达拼图数据和江西自动站等数据,采用数据统计、形态分析、个例对比等方法,对2019年3月21日江西上饶强飑线过程进行分析。结果表明:1)飑线是在低层暖湿、中层干冷,不稳定的大气层结以及江南暖倒槽发展、地面中尺度辐合线、低层切变线、急流共同作用下产生的,前期属于槽前暖平流强迫类强对流,后期冷锋强迫抬升转为斜压锋生类强对流;2)对流回波带发展成弓状回波结构后,回波强度CR可达60~70 dBz,弓状回波带中段前沿向前突出,移动速度达到110 km/h,带来雷暴大风、冰雹、强雷电和短时强降水等强对流天气;3)对流风暴前端大的回波梯度、快速移动的弓状回波,以及明显的悬垂结构、强的VIL都是容易造成雷暴大风、冰雹和短时强降水的雷达回波典型特征。
Using MICAPS data,Jiangxi strong weather monitoring data,Jiangxi WebGIS Radar Mosaic data and Jiangxi automatic station data,the process of Shangrao strong squall line in Jiangxi Province on March 21,2019 was analyzed by means of data statistics,morphological analysis and case comparison.The results show that:1)Squall line occurs in low-level warm and humid,middle-level dry and cold,unstable atmospheric stratification,and inverted trough in Jiangnan.Under the combined action of spreading,mesoscale convergence line,low-level shear line and jet,the warm advection-like strong convection in front of trough is generated,and the forced uplift of cold front turns to baroclinic frontogenesis-like strong convection in the later stage;2)After the convective echo zone develops into bow echo structure,the echo intensity CR can reach 60~70 dBz,and the forward front of bow echo zone is prominent in the middle section,with the moving speed reaching 110 km/h,bringing thunderstorms.Strong convective weather such as gale,hail,strong thunder and short-term heavy rainfall;3)Large echo gradient in front of convective storm,fast moving bow echo,obvious hanging structure and strong VIL are typical radar echo characteristics which are easy to cause thunderstorm,hail and short-term heavy rainfall.
作者
朱海燕
洪俊
沈宁
ZHU Haiyan;HONG Jun;SHEN Ning(Shangrao County Meteorological Bureau,334100,Shangrao,Jiangxi,PRC;Shangrao Meteorological Bureau,334000,Shangrao,Jiangxi,PRC)
出处
《江西科学》
2019年第5期689-693,702,共6页
Jiangxi Science
基金
中国气象局气象关键技术集成与应用项目(CMAGJ2013M74)
中国气象科学研究院开放课题(2012LASWB01)
南京雷达气象与强天气开放基金项目(BJG201205)
关键词
飑线
槽前暖平流强迫
弓状回波带
超级单体
squall line
warm advection forcing in front of trough
arcuate echo zone
supercell
