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- Title
辽东半岛一次湿下击暴流过程分析.
- Authors
贾旭轩; 梁 军; 刘晓初; 冯呈呈; 张子莹
- Abstract
On September 11,2020, severe convective weather occurred in the southern part of Liaodong Penin‐ sula, and wet downbursts appeared. The maximum surface wind gust at Dalian Jinzhou Desheng station reached 21. 7 m·s -1 . By using conventional observation data, Dalian Doppler radar data, ERA5 data and high-resolution mesoscale simulation data, the circulation background, convective environment and echo characteristics of this wet downburst was analyzed. The results show as follow:the major synoptic system is shear line made up of southwest and southeast winds located to the east of upper-level cold vortex transformed by north-moving tropi‐ cal cyclone. The mechanisms of convective initiation are surface convergence line and low-level jet. Coupling up‐ per-level divergence enhances initial connection development. The convection system moved westward and land‐ ed on the frontal zone between the ground cold pool and the east warm air, and the convergence lifting effect in‐ creased, promoting higher organization and more severe of the convection system. The highly warm and moist surrounding air and the instability are favorable conditions for convection. Before convection occurred, the sounding shows dry air overlapping moist air and "V" pattern. The lifting condensation level decreases distinctly. During the wet downburst, radar radial velocity shows mid-altitude radial convergence(MARC), low-level di‐ vergence. Before and after the gale, high and low elevations all exhibits more than 45 dBZ reflectivity notch. The high reflectivity notch at high elevation appears prior to that at low elevation. Monitoring the changes of the high elevation reflectivity contributes to the early warning of wet downburst.
- Publication
Plateau Meteorology, 2024, Vol 43, Issue 2, p411
- ISSN
1000-0534
- Publication type
Article
- DOI
10.7522/j.issn.1000-0534.2023.00070