热带气象学报2024，Vol.40Issue(3)：362-372,11.DOI:10.16032/j.issn.1004-4965.2024.033
浙江一次连续下击暴流的多普勒雷达特征与成因分析
Doppler Radar Characteristics and Cause Analysis of a Continuous Downburst in Zhejiang
摘要
Abstract
Using routine observation data,ERA5 hourly reanalysis data(0.25 °×0.25 °)and Doppler weather radars in Zhejiang Province,this paper analyzed the doppler radar characteristics and cause of the event that occurred on March 21,2020.The results showed that:(1)This process occurred under the background of strong development of the southwest jet at the middle and upper levels and the surface low-pressure trough which was a forced strong convection of the low-level warm advection.The wet layer of the whole atmosphere was shallow,the near surface inversion and the middle dry cooling layer enhanced the unstable stratification with dry and cold upper and warm and wet lower,while the strong vertical wind shear in the upper air was conducive to the formation and development of strong storms,and the surface mesoscale convergence line triggered this process under the high temperature background.(2)The downburst was caused by two multi-cell storms exhibiting"Bow Echo"characteristics,including mid-level echo overhang,bounded weak echo zone,and three-body scattering.Extreme winds occurred during the descending phase of maximum reflectivity factor altitude,storm crest height,and VIL descent in unit K0,while the maximum reflectivity factor altitude,storm crest height,and reflectivity factor kernel remained relatively stable in unit Y5.(3)The downburst above level 10 primarily occurred during the stage of strong development of vorticity advection and weak cold air intrusion in the middle layer.The disaster-causing downburst in unit K0 was mainly generated by the dragging effect of hail,while in unit Y5,it was generated by the combined dragging effect of hail and short-term heavy precipitation.关键词
下击暴流/超级单体/中气旋/地面辐合线Key words
downburst/supercell/mesocyclone/ground convergence line分类
天文与地球科学引用本文复制引用
沈晓玲,周弘媛,黄颖杰,赵驰宇,贾安琪..浙江一次连续下击暴流的多普勒雷达特征与成因分析[J].热带气象学报,2024,40(3):362-372,11.基金项目
浙江省气象局科技计划项目(2023YB23)资助 （2023YB23）
