“0713”山西短时强降水天气的潜势及触发条件分析
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山西省气象局资助项目(SXKMSTQ20185110;SXKZDTQ20205201);中国气象局预报员专项(CMAYBY2019-015)


Analysis of the potential and triggering characteristics of short-term heavy precipitation in Shanxi on July 13, 2018
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    摘要:

    利用常规观测资料、NCEP 1°×1°再分析资料、FY-2G卫星逐时TBB资料、多普勒雷达及自动站资料,对2018年7月13日夜间出现在山西东南部的短时强降水天气进行了潜势及触发特征分析。结果表明:副高外围的强劲西南气流为本次短时强降水过程提供了充沛的水汽条件;“上干冷下暖湿”的层结结构与“高层冷平流、低层暖平流”的温度差动平流提供了强对流发生发展所需的能量条件;上升运动的形成和维持有利于不稳定能量的释放和增强。地面β中尺度辐合线发展为β中尺度涡旋,激发β中尺度对流云团的合并与加强;大于等于35 dBZ的β中尺度带状回波中镶嵌的γ中尺度对流单体,在500 hPa西南气流的引导下,形成高度组织化的多单体线状回波缓慢移动是形成局地短历时强降水的直接原因。

    Abstract:

    In this paper,using conventional observation data,NCEP 1°×1° reanalysis data,FY-2G satellite hourly TBB data,radar and AWS data,the potential and triggering characteristics of short-term heavy precipitation in southeastern Shanxi Province on the night of July 13,2018 were analyzed.The results reveal that the strong southwest airflow around subtropical high provide abundant water vapor conditions for the short-term heavy precipitation process.In addition,the stratification structure of "dry and cold under warm and wet" and the temperature differential advection of "high-level cold advection and low-level warm advection" provides the energy conditions required for the development of strong convection.The formation and maintenance of ascending motion are conducive to the release and enhancement of unstable energy.The meso-β scale convergence line on the ground develops into a meso-β scale vortex,thereby stimulating the consolidation and strengthening of the mid-β scale convective cloud mass,which in turn stimulates the merging and strengthening of meso-βscale convective clouds.The meso-γscale convective monomer embedded in the meso-βscale band echo of ≥ 35 dBZ,under the guidance of the 500 hPa southwest airflow,forms a slowly moving,highly organized multi-cell linear echo,which was the direct cause of the formation of short-duration heavy rainfall.The short-term heavy precipitation is located between 5 880 gpm and 5 840 gpm on the 500 hPa map,between the 850 hPa and 700 hPa shear line,and overlaps with 850 hPa and 700 hPa wet tongue,ground trunk line and mesoscale convergence line (near the 10 km range),as well as the cold air inflow side of the convective cloud mass TBB gradient high value area and TBB ≤ -60℃.

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  • 收稿日期:2019-03-30
  • 最后修改日期:2019-06-12
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  • 在线发布日期: 2020-08-31

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