| 摘要: |
| 该文利用习水107个站点的降水观测数据、高空和地面形势实况资料、习水双偏振雷达数据、ERA5全球再分析资料，通过天气学统计方法，分析2021年9月12日习水强降水过程成因，并解释了地形对此次强降水的增强作用。分析结果表明：（1）此次过程发生在双台风夹击的背景下，主要影响系统有对流层中层高空槽、低空低涡切变线；（2）高空槽东移迫使低涡切变线发展加强，为此次过程提供了抬升条件，14号超强台风“灿都”外围的偏东气流减缓了低涡切变线东移速度，使得其在习水停留时间变长，同时，低空偏南气流和偏东气流的辐合为强降水的发生发展提供了热力不稳定和水汽条件；（3）雷达回波是以积云为主的混合降水回波，多对流单体活动，并有明显的“列车效应”现象；（4）由于大娄山南侧地形对对流层的气流有辐合抬升作用，对流单体在山脉南侧移速减慢、合并增强，导致降水强度和范围增大，从而形成此次强降水过程。 |
| 关键词: 低涡切变暴雨；地形；习水南部 |
| DOI： |
| 投稿时间：2023-04-13 |
| 基金项目:遵义市科技局科技支撑项目（遵市科合支撑GY〔2021〕63号）：基于雷达的遵义市暴雨监测预警平台建设；贵州省山地气候与资源重点实验室基金项目（QHLSSLJ〔2022〕-01）：遵义市短历时暴雨预报预警技术 |
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| Topographical Role in the Strongest Autumn Precipitation in the South of Xishui |
| YANG Yi,LI Xia,LIU Hongshuang,YANG Yumeng,XIE Helin |
| (Zunyi Meteorological Bureau of Guizhou Province, Zunyi 563000 , China;Guizhou Mountain Meteorological Institute, Guiyang 550002 , China) |
| Abstract: |
| In this paper, using precipitation observation data of 107 stations of Xishui, high altitude and ground situation dare, Xishui double polarization radar dare,and ERA5 global reanalysis date, the cause of the heavy precipitation process in Xishui on September 12,2021 were analyzed through the meteorological statistical methods, and the enhancement effect of terrain on this heavy precipitation was explained. The following conclusions are drawn: (1) the process took place under the background of double typhoons, and the main impact system is the middle upper trough of the troposphere and the low vortex shear line.(2) High trough eastward forced low vortex shear line development, provides the lifting conditions for the process, 14 super typhoon “can all” peripheral easterly airflow slowed the low vortex shear line eastward velocity, makes in water stay time longer, at the same time, the low southward airflow and easterly airflow convergence for the development of heavy precipitation provides the thermal instability and water vapor conditions.(3) Radar echo is a mixed precipitation echo dominated by cumulus cloud, with multi-convection monomer activity, and has an obvious “train effect” phenomenon.(4) Because the terrain on the south side of Dalou Mountain lifts the air flow in the troposphere, the movement speed of the convection monomer in the south side of the mountain slows down and the merger is enhanced, resulting in the increase of the intensity of precipitation and range, thus forming the heavy precipitation process. |
| Key words: low vortex shear rainstorm； terrain； south of Xishui |
