QIAN Xian,CHEN Yun,XIAO Tiangui.Mesoscale Characteristics Analysis of the Extreme Rainstorm in Suizhou on August 12, 2021[J].Journal of Chengdu University of Information Technology,2023,38(04):450-458.[doi:10.16836/j.cnki.jcuit.2023.04.012]
“8·12”随州极端暴雨的中尺度特征分析
- Title:
- Mesoscale Characteristics Analysis of the Extreme Rainstorm in Suizhou on August 12, 2021
- 文章编号:
- 2096-1618(2023)04-0450-09
- Keywords:
- atmospheric science; mesoscale meteorology; extreme rainstorm; flash heavy rain; train effect
- 分类号:
- P459
- 文献标志码:
- A
- 摘要:
- 为进一步研究湖北暖季短时强降水特征, 利用自动站逐小时降水资料、地面与高空常规观测资料、探空资料、FY- 4A卫星资料逐小时数据及新一代多普勒天气雷达探测资料和ECWMF 0.25°×0.25°再分析等资料, 主要采用中尺度分析的方法对2021年随州“8·12”极端暴雨过程的中尺度特征进行研究, 结果表明:(1)此次极端暴雨过程以持续短时强降水为特征, 具有短时强降水的贡献率大、对流性强、强降雨总量大, 时段集中、极端性强等特点;(2)此过程在江淮梅雨环流背景下产生, 伴随副热带和温带天气系统的同步调整, 低空中尺度偏东风急流建立, 暖式切变线加强, 梅雨锋得到增强, 在高温高湿及不稳定条件下形成;(3)冷暖空气交汇于低层切边线附近, 形成东西向强辐合抬升区, 影响随州地区的中β尺度低涡系统沿切变线东移。其中, 随州附近持续驻留的中γ尺度对流系统列车效应明显, 为强降雨的发展和维持提供条件。(4)在鄂西北复杂地形的影响下, 中尺度对流系统被触发并缓慢移动, 遇到山体被迫抬升, 并形成一定高度的多个涡旋触发对流, 复杂地形对维持加强短时强降水的影响和具体机制则需要进一步研究。
- Abstract:
- In order to further study the characteristics of the flash heavy rain in Hubei Province during warm season, using hourly precipitation data from automatic stations, ground and high-altitude observation data, radiosonde data, hourly data from FY- 4A satellite data, new generation Doppler weather radar detection data and ECWMF 0.25°×0.25° reanalysis data, the mesoscale analysis method was mainly used to study the mesoscale characteristics of the extreme rainstorm process in Suizhou on August 12, 2021. The results show that:(1)The extreme rainstorm process is characterized by continuous flash heavy rain with a great contribution rate of flash heavy rain, severe convection, large total amount of heavy rainfall, concentrated time period, and strong extreme;(2)The precipitation process occurs in the background of the Jianghuai Meiyu circulation, with the synchronous adjustment of the subtropical and temperate weather systems, the low-air-scale easterly jet is established, the warm shear line is strengthened, and the Meiyu front is also strengthened, is formed under high temperature, high humidity and unstable conditions;(3)The cold and warm air converges near the low-level shear line, forming an east-west strong convergence and uplift area, which affects the meso-β-scale vortex system in Suizhou area to move eastward along the shear line. The train effect of the meso-γ-scale convective system that persists near Suizhou is obvious, which provides conditions for the development and maintenance of heavy rainfall;(4)Under the influence of the complex terrain in northwestern Hubei, the mesoscale system is triggered and moved slowly, the mountain is forced to rise, and multiple vortices with a certain height are formed to trigger convection. The impact of the complex terrain on maintaining and strengthening flash heavy rain and specific mechanism need further research.
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备注/Memo
收稿日期:2022-04-06
基金项目:国家自然科学基金重大集成资助项目(91937301); 国家自然科学基金面上资助项目(41975001)
通信作者:谌芸.Email:chenyun@cma.gov.cn