| 武陵山区一次暖区强降水触发和维持机制分析 |
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| 引用本文： | 罗娟,邓承之,高松,刘超,庞玥,夏蘩.武陵山区一次暖区强降水触发和维持机制分析[J].热带气象学报,2022,38(5):754-764. |
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| 作者姓名： | 罗娟 邓承之 高松 刘超 庞玥 夏蘩 |
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| 作者单位： | 1.重庆市气象台，重庆 401147 |
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| 基金项目： | 重庆市技术创新与应用发展专项cstc2019jscx-tjsbX0007中国气象局预报员专项项目CMAYBY2020-105重庆市气象部门业务技术攻关项目YWJSGG-202118 |
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| 摘 要： | 利用自动站观测资料、多普勒雷达资料、ERA5 0.25 °×0.25 °再分析资料及WRF数值模拟资料，对2018年5月19—20日发生在重庆武陵山区一次暖区暴雨过程中尺度环境条件及中小尺度对流系统演变、触发和维持机制等进行分析。结果表明:（1）此次过程无明显冷空气强迫，斜压性弱，边界层高温高湿，对流层中下层存在明显条件不稳定层结；（2）石桥强降水中小尺度对流系统演变主要有3个阶段:分散对流组织成东西向带状对流、带状对流断裂后雨团准静止维持、东北-西南向带状对流快速重建；（3）沿武陵山脉分布的边界层辐合线触发雷暴发生，强回波单体沿辐合线移动和加强，形成“列车效应”；（4）石桥东部山顶雷暴冷池出流下山，与环境暖湿气流和地形作用共同维持石桥强降水；（5）山区地形对降水有重要影响，近地面偏东风与石桥西部山体相互作用形成局地气旋性小涡旋触发降水，而受到石桥东部山体阻挡作用，地形性涡旋移速变慢，利于强降水维持。
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| 关 键 词： | 暖区暴雨 边界层辐合线 列车效应 冷池 地形性涡旋 |
| 收稿时间： | 2021-02-25 |
ANALYSIS ON THE TRIGGERING AND MAINTENANCE MECHANISM OF ONE HEAVY PRECIPITATION IN WARM AREA IN WULING MOUNTAIN |
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| LUO Juan,DENG Chengzhi,GAO Song,LIU Chao,PANG Yue,XIA Fan.ANALYSIS ON THE TRIGGERING AND MAINTENANCE MECHANISM OF ONE HEAVY PRECIPITATION IN WARM AREA IN WULING MOUNTAIN[J].Journal of Tropical Meteorology,2022,38(5):754-764. |
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| Authors: | LUO Juan DENG Chengzhi GAO Song LIU Chao PANG Yue XIA Fan |
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| Institution: | 1.Chongqing Meteorological Observatory, Chongqing 401147, China2.Chongqing Institute of Meteorological Science, Chongqing 401147, China |
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| Abstract: | Using automatic station observation data, Doppler radar data, ERA-5 0.25°×0.25° reanalysis data and WRF numerical simulation data, we analyzed the mesoscale environmental conditions, the mesoscale convective systems triggering and maintenance mechanisms of one warm-sector heavy rainfall process in the Wuling Mountains of Chongqing on May 19-20, 2018. The results were as follows: (1) There was no obvious cold air forcing in this process, the baroclinicity is weak, but the boundary layer had high temperature and humidity, and the atmosphere stratification was extremely unstable. (2) The evolution of the mid- and small-scale convective systems of the heavy precipitation in Shiqiao mainly had three stages: the convections scattered into east-west zonal flow, the rainfall near Shiqiao remained quasi-stationary after the break of the zonal flow, and the northeast-southwest zonal flow reconstructed rapidly. (3) The convergence line which distributed along the Wuling Mountains, triggered the thunderstorm. The strong echo of convective cell moved and strengthened along the convergence line, contributing to the formation of the "train effect". (4) The strong thunderstorm cold pool on the eastern mountain top of Shiqiao flowed down the mountain, working together with the warm and humid air currents and topography to maintain the strong precipitation in Shiqiao. (5) Topography played an important role in this heavy precipitation process. The easterly wind near the ground interacted with the mountains in the west of Shiqiao to form a small local cyclonic vortex, which made significant contribution to triggering precipitation. Moreover, due to the blocking effect of the mountains in the east of Shiqiao, the speed of the topographic vortex slowed down, which was conducive to the maintenance of precipitation. |
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| Keywords: | warm-sector heavy rainfall boundary layer convergence line train effect cold pool topographic vortex |
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