气象与环境学报2024，Vol.40Issue(6)：1-9,9.DOI:10.3969/j.issn.1673-503X.2024.06.001
辽东半岛两次由微湿下击暴流引发的雷暴大风过程对比分析
Comparative analysis of two thunderstorm gale events triggered by wet microbursts over the Liaodong Peninsula
摘要
Abstract
The study utilizes SA Doppler weather radar data from Dalian and Dandong,combined with surface ob-servations and ERA5 reanalysis data,to conduct a comparative analysis of the synoptic background and mecha-nisms of two mild-wet downburst events over the Liaodong Peninsula:the first on September 11,2020(Event Ⅰ),and the second on September 10,2021(Event Ⅱ).Results indicate that both events occur under the influence of a Northeast Cold Vortex.Event I is associated with a cold vertex transformed from a northward typhoon,while Event Ⅱ involves a cut-off low.Both events are characterized by unstable atmospheric stratifications of"upper-wet and lower-dry",with skew-T diagrams showing an upward-opening"bell-shaped"structure.Near-surface temperature lapse rates are nearly dry-adiabatic.The precipitable water content exceeds 30 mm.The lifting condensation level is low,with CAPE and DCAPE values being relatively small.The 0-6 km wind shear intensity is significantly stron-ger in Event Ⅱ than in Event Ⅰ.The thunderstorm gale events in both cases are induced by wet microbursts,with E-vent I involving an isolated storm and Event Ⅱ embedded within a squall line system.In both cases,the Doppler ra-dar reflectivity notches exceeding 45 dBz appear earlier at higher elevation angles than at lower elevation angles prior to the wet microbursts.关键词
东北冷涡/切断低压/雷暴大风Key words
Northeast Cold Vortex(NCV)/Cut-off low/Thunderstorm gale分类
天文与地球科学引用本文复制引用
贾旭轩,纪永明,段云霞,刘晓初,梁军..辽东半岛两次由微湿下击暴流引发的雷暴大风过程对比分析[J].气象与环境学报,2024,40(6):1-9,9.基金项目
中国气象局沈阳大气环境研究所联合开放基金课题(2021SYIAEKFMS01)、灾害天气国家重点实验室开放课题(2024LASW-B14)、环渤海区域科技创新基金(QYXM202108、QYXM202208)和中国气象局创新发展专项(CXFZ2023J014)共同资助. （2021SYIAEKFMS01）
