沙漠与绿洲气象2025，Vol.19Issue(3)：122-131,10.DOI:10.12057/j.issn.1002-0799.2311.27001
冷涡背景下致灾双飑线的触发和维持机制分析
Triggering and Maintenance Mechanisms of Disastrous Double Squall Lines in the Context of a Cold Vortex
摘要
Abstract
Using observations from regional automatic weather stations,ERA5 reanalysis,FY-4A satellite data,and Doppler radar,this study investigates the synoptic background,environmental conditions,triggering mechanisms,and sustaining dynamics of a double squall line event that impacted Shandong on June 13,2022,under a cold vortex background.Key findings include:The event involved two consecutive squall lines,a locally developed squall line in Shandong(Squall Line A)and a squall line originating from Shanxi and Hebei(Squall Line B).Strong northwesterly flow behind the cold vortex transported cold,dry air over a low-level warm ridge,creating a thermally unstable environment with high Convective Available Potential Energy(CAPE)and significant total instability,favoring squall line development.Squall Line A was triggered by a surface convergence line in northwestern Shandong,an 850 hPa dryline,and a gust front south of a convective storm over the Bohai Sea,while Squall Line B initiation was linked to a surface secondary cold front and solar heating.Squall Line A was sustained by slantwise ascent of warm,moist inflow(generating upper-level divergence)and rear descending airflow-induced convergence.Its self-organized structure combined environmental inflow and storm outflow,persisting despite weak vertical wind shear in northern Shandong.Moisture and energy south of central Shandong further supported maintenance,with expansion of the rear stratiform cloud region.After Squall Line A affected eastern Henan and southwestern Shandong,rapid reestablishment of low-level convective conditions and moderate vertical wind shear facilitated Squall Line B's persistence.These findings enhance the understanding of squall line dynamics in Shandong under cold vortex conditions.关键词
冷涡/双飑线/触发/自组织结构Key words
cold vortex/double squall line/triggering mechanism/self-organized structure分类
天文与地球科学引用本文复制引用
黄燕玲,李建,王亚兰,陈立峰,庞一龙..冷涡背景下致灾双飑线的触发和维持机制分析[J].沙漠与绿洲气象,2025,19(3):122-131,10.基金项目
山东省气象局预报员专项(SDYBY2020-06) （SDYBY2020-06）
枣庄市气象局重点课题(ZZQXZ2023-02) （ZZQXZ2023-02）
中国气象局云降水物理与人工影响天气重点开放实验室创新基金项目(2023CPML-B07) （2023CPML-B07）
