一次飑线演变为区域持续性特大暴雨过程的模拟分析OACSTPCD
Simulation analysis of a process evolving form a squall line to a regional persistent heavy rain
本文对2020年8月13-14日山东一次飑线演变为区域持续性特大暴雨的过程进行了数值模拟和诊断分析,发现:(1)前期降水形成的冷池出流遇西南暖湿气流触发东北—西南向飑线系统;(2)大尺度系统的移动速度决定了降水系统的性质:13日冷涡系统东移较快,形成的飑线自鲁西北向鲁东南不断移动,而14日冷涡系统东移缓慢、副热带高压脊线稳定维持在32°N附近,大尺度环境相对稳定导致区域性持续性降水的发生;(3)干冷空气的侵入使得飑线内对流单体沿干侵入与低层暖湿气流的交界面强烈发展,并随着干侵入的南推向东南移动,干侵入与西南暖湿气流相对位置的变化促使此次暴雨过程由飑线演变为区域持续性降水,干侵入的稳定少动使得鲁南持续性降水得以较长时间维持;(4)对流环境的反复重建是此次区域持续性特大暴雨发生的中尺度环境影响因素.
The numerical simulation and diagnostic analysis of a regional persistent heavy rain process evolving form a squall line in Shandong Province on August 13-14,2020 show that:(1)the outflow of cold pool formed by the previous precipitation meets the southwest warm and humid airflow,triggering the northeast-southwest squall line system.(2)The movement speed of the large-scale system determines the nature of the precipitation system.In 13,the cold vortex system moved eastward faster,and the formed squall line continuously moved from the northwest to the southeast in Shandong,while in 14,the cold vortex system moved eastward slowly,and the subtropical high ridge remained stable around 32° N,and the relatively stable large-scale environment led to the occurrence of regional persistent precipitation.(3)The invasion of dry and cold air makes the convective cells in the squall line develop strong along the interface between dry intrusion and low-level warm and wet air flow,and move to southeast with the dry intrusion moving southward.The change of the relative position of dry intrusion and southwest warm and wet airflow makes the rainstorm process evolve from the squall line to regional persistent precipitation,and the stable of dry intrusion enables the persistent precipitation in southern Shandong to be maintained for a long time.(4)The repeated reconstruction of the convective environment is the mesoscale influencing factor for the occurrence of the regional persistent heavy rain.
肖明静;吴炜;范苏丹;曲巧娜;荣艳敏
山东省气象防灾减灾重点实验室,济南 250031||山东省气象科学研究所,济南 250031||长岛国家气候观象台,山东烟台 264000山东省气象防灾减灾重点实验室,济南 250031||山东省气象科学研究所,济南 250031||长岛国家气候观象台,山东烟台 264000山东省气象防灾减灾重点实验室,济南 250031||山东省气象科学研究所,济南 250031||长岛国家气候观象台,山东烟台 264000山东省气象防灾减灾重点实验室,济南 250031||山东省气象科学研究所,济南 250031||长岛国家气候观象台,山东烟台 264000山东省气象防灾减灾重点实验室,济南 250031||山东省气象科学研究所,济南 250031||长岛国家气候观象台,山东烟台 264000
大气科学
飑线冷池区域持续性暴雨低空急流干侵入
squall linecold poolregional persistent rainstormlow-level jet streamdry invasion
《气象科学》 2024 (6)
1016-1026,11
山东省自然科学基金面上资助项目(ZR2022MD40)中国气象局创新发展专项(CXFZ2023J084)山东省气象局科技基金面上资助项目(2022sdqxm04)环渤海区域科技协同创新基金资助项目(QYXM202007QYXM202202QYXM202202)山东台风与海洋气象创新团队(SDCXTD2021-2)
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