ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Multi-scale Characteristics Analysis of an Extreme Convective Wind Event at Tianjin Airport
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Abstract:
This study examines the multi-scale processes responsible for an extreme thunderstorm downburst event (peak wind 31.5 m·s-1) that occurred at Tianjin Airport on 4 August 2013, focusing on the synoptic background, structural characteristics of the storm, and dynamical mechanisms of the severe winds. The results show that this event developed within a post-trough unstable environment, characterized by a pronounced dry layer in the mid-troposphere and moisture concentration below 925 hPa. Convective available potential energy (CAPE) exceeding 3000 J·kg-1, coupled with strong 0-6 km vertical wind shear and steep temperature lapse rates in the boundary layer, established a favorable environment for thunderstorm gales. The damaging winds originated from a squall line propagating rapidly from northwest to southeast. The passage of its leading gust front triggered the initial wind surge, while subsequent extreme winds during the second phase resulted from a downburst generated by an intensifying multi-cell storm embedded in the squall line. Both the squall line and downburst exhibited significant mobility, with precipitation-induced evaporative cooling, hydrometeor loading, and mid-level convergence identified as primary drivers of downburst formation.
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Project Supported:
Heavy Rainfall Research Foundation of China（BYKJ2024M05）
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