热带气象学报2024，Vol.40Issue(2)：297-312,16.DOI:10.16032/j.issn.1004-4965.2024.028
2022年6月19日广东佛山龙卷的双极化相控阵雷达特征
Observation of the 19 June 2022 Tornado by X-Band Polarimetric Phased Array Radar in Foshan,Guangdong
摘要
Abstract
Based on the data of an X-band polarimetric phased array radar and other multi-source observation data,we present in detail the environmental conditions and evolution of the radar signatures of an EF1 tornado that took place in Foshan,Guangdong on 19 June 2022.The tornado was spawned from a supercell that developed at the southern end of a squall line,which developed in an active southwesterly airflow environment after the onset of the southwest monsoon.The ambient atmosphere had all thermal and dynamic conditions that were conducive to the occurrence and development of supercell and tornado,such as strong convective instability energy,low lifting condensation level and strong vertical wind shear.The significant enhancement of the low-level storm relative helicity,supercell composite parameter and significant tornado parameter had a good indication for the occurrence of a supercell tornado.A polarimetric phased array radar with high spatial and temporal resolution at Nanhai detected the development process of a mini-supercell and the evolution characteristics of a tornado vortex.The convective storm gradually formed a hook echo and a reflectivity hole with the strengthening of a front low-level inflow.The mesocyclone formed at a height of more than 2.5 km and then extended to the lower level.With the strengthening of rear-flank downdrafts,the vortex rotation at the lower level was enhanced.When the rotation speed of the low-level mesocyclone exceeded 22 m·s-1(strong mesocyclone)and the diameter contracted to less than 1.5 km,the tornado was about to touch the ground.The appearance of tornado vortex signature(TVS)and tornadic debris signature(TDS)is the main feature of tornado occurrence.The tornado occurred near the reflectivity hole,TVS and TDS.关键词
X波段双极化相控阵雷达/超级单体龙卷/龙卷涡旋特征/龙卷碎片特征/反射率弱回波空洞Key words
X-band polarimetric phased array radar/supercell tornado/TVS/TDS/reflectivity hole分类
天文与地球科学引用本文复制引用
植江玲,白兰强,黄先香,蔡康龙,张晶晶,李兆明,黄舒婷..2022年6月19日广东佛山龙卷的双极化相控阵雷达特征[J].热带气象学报,2024,40(2):297-312,16.基金项目
广东省重点科技项目(2019B020208015) （2019B020208015）
广东省气象局科研项目(GRMC2021LM06) （GRMC2021LM06）
佛山市重点领域科技攻关项目(2120001008761) （2120001008761）
中国气象局大气探测重点开放实验室开放课题(U2021M04) （U2021M04）
中国气象局龙卷风重点开放实验室开放课题(TKL202305) （TKL202305）
佛山市气象局科技项目(201905)共同资助 （201905）
