文章摘要
日照一次EF2级龙卷的环境场及雷达特征分析
Analysis of environmental field and radar characteristics of a EF2 scale Tornado in Rizhao
投稿时间:2021-11-03  修订日期:2022-03-02
DOI:
中文关键词: 龙卷  中气旋  超级单体风暴  γ中尺度涡旋  龙卷涡旋特征
英文关键词: tornado  mesocyclone  ?supercell storm  meso-γ scale vortex  tornado vortex characteristics
基金项目:国家重点研发计划项目(2018YFC1507903,2018YFC1506104)、山东省自然科学基金项目(ZR2020MD053)
作者单位邮编
于怀征 山东省气象防灾减灾重点实验室日照市气象局 276826
龚佃利 山东省气象防灾减灾重点实验室山东人民政府人工影响天气办公室 250031
朱君鉴 山东省气象台 250031
陆桂荣 山东省气象防灾减灾重点实验室日照市气象局 276826
吴炫 山东省气象防灾减灾重点实验室日照市气象局 276826
王凤梅 山东省气象防灾减灾重点实验室莒县气象局 276500
卢绪兰 山东省气象防灾减灾重点实验室山东省气象科学研究所 
万克利 山东省气象防灾减灾重点实验室日照市气象局 
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中文摘要:
   利用常规观测资料、区域站加密观测资料、多普勒雷达资料和NCEP/NCAR 1°×1°再分析资料,对2019年8月16日发生在日照一次龙卷天气过程的天气形势、环境物理量和涡旋特征进行了分析。结果表明:地面β中尺度辐合线和高空冷涡是此次龙卷发生的主要影响系统,较湿的近地面层、较低的抬升凝结高度为龙卷的发生提供了有利的环境条件。地面辐合线上的γ中尺度涡旋在显著深厚湿对流潜势下触发了对流,较大的CAPE和较强的0~3 km垂直风切变有利于初生对流的发展、合并,形成超级单体风暴。龙卷发生时,超级单体风暴低层右前侧出现钩状回波、入流缺口。较强的风暴单体、深厚持久的中气旋、中气旋强中心和底部迅速下降并重合、气旋性涡旋加强、最大风切变跃增、多个时次体扫出现龙卷涡旋特征(TVS)是地面龙卷发生的主要特征。对龙卷风暴单体移动起主导作用的因子在不同时段有所不同,前期主要受平流的影响;风暴单体合并的过程中,风暴移动受传播和平流的共同影响;风暴单体完全合并后,引导气流对风暴的移动又起主要作用。
英文摘要:
   Tornado weather process?occurred in Rizhao on 16 August 2019 was analyzed using conventional observation data,regional automatic station meteorological data,Doppler weather radar dataand ?NCEP/NCAR 1° ×1°reanalysis data?. The results show that: The Β mesoscale convergence line and the northeast cold vortex are the main influence systems of the tornado.The wet near surface layer and the low rise condensation height provide favorable environment for the tornado.The γ Mesoscale vortices on the ground convergence line trigger convection under significant deep wet convective potential,The Larger CAPE and stronger 0-3 km vertical wind shear are conducive to the development and merger of primary convection, which eventually leads to the formation of small supercells.The Hook Echo and inflow notch appeared on the right front of the small supercell lower layer when the tornado occurred. The main echo characteristics of tornado are strong storm cell, deep and long-lasting Mesocyclone, the strong center and bottom of the Mesocyclone are descend rapidly and coincide, maximun shear decreases sharply,cyclonic vortex strengthening, Tornado Vortex appearing (TVS) in many times.The factors that play a dominant role in the individual movement of a tornado are different in different time periods.The early stage is mainly determined by the propagation, and the later stage is mainly influenced by the guiding airflow.
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