摘要: |
利用常规观测资料、自动区域站雨量、卫星TBB资料、雷达资料,对恩施州2016年6月24日发生的一次大范围暴雨过程进行分析。结果表明: 本次强降水,具有典型的两槽一脊“单阻型”梅雨环流特征,在有利的大尺度环流背景下,在高空槽、低层低涡切变、西南急流、地面中尺度辐合线等中尺度天气系统的共同影响、相互作用下,形成了此次大范围强降水。此次暴雨空间上分布不均,局地性强,表现为明显的中尺度对流性特征,雷达回波图上降水性质表现为混合型降水,暴雨的直接影响系统是中β尺度对流系统,且中β尺度对流系统在多个中尺度对流云团合并后加强,时间尺度约为5 h。此次暴雨过程是在上干冷下暖湿强的大气层结不稳定条件下,梅雨锋、边界层辐合线和地形槽的触发作用将前期积累的能量释放产生的强对流天气,同时,副高外围西南气流将南海和西太平洋的水汽向恩施输送,为暴雨的发生提供了有利的条件。 |
关键词: 暴雨、中尺度系统、对流云团 |
DOI: |
投稿时间:2017-12-28修订日期:2018-07-17 |
基金项目: |
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The characteristics of the mesoscale system in the "6 ·24" rainstorm of Enshi City |
Tan Yanli |
(Enshi tujia miao autonomous prefecture meteorological bureau) |
Abstract: |
using conventional observation data, automatic regional station rainfall, satellite TBB data and radar data to analyzing of the heavy rainstorm process occurred on June 24, 2016 in enshi.The results showed that the heavy rain, as the typical two trough a ridge "single resistance type" meiyu circulation characteristics, under the favorable large scale circulation background, in the upper trough, low low-level southwest vortex shear, rapids, surface mesoscale convergence line of mesoscale weather system such as under the interaction, mutual influence, formed the big range of strong precipitation.The storm on the space distribution, local sex is strong, show the obvious mesoscale convective characteristics, radar echo figure on the precipitation properties of hybrid precipitation, rainstorm directly affect the system is in beta scale convection system, and the beta scale convection system in multiple mesoscale convective cloud combined strengthening, time scale of about 5 h.Under the process of heavy rain is on the dry and wet strong atmosphere and unstable condition, meiyu front, boundary layer convergence lines and topographic trough triggered effect will be the accumulation of energy release of strong convective weather, at the same time, the southwest of subtropical high peripheral airflow to the south China sea and western Pacific vapor is transported to the enshi, provides favorable conditions for the beginning of the rainstorm. |
Key words: the rainstorm, mesoscale system, convective cloud cluster |