| 广西东南部“海葵”残涡特大暴雨成因初探 |
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| 引用本文： | 陆秋霖,林确略,李秀昌,韦荣,张容菁,陈明璐.广西东南部“海葵”残涡特大暴雨成因初探[J].新疆气象,2024,18(4):183-190. |
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| 作者姓名： | 陆秋霖 林确略 李秀昌 韦荣 张容菁 陈明璐 |
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| 作者单位： | 广西玉林市气象局,537000,广西玉林市气象局,537000,广西玉林市气象局,537000,广西玉林市气象局,537000,广西玉林市气象局,537000,广西玉林市气象局,537000 |
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| 基金项目： | 广西气象科研青年人才培养项目(桂气科2022QN04) |
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| 摘 要： | 利用各种常规气象资料、ERA5再分析资料等对2023年9月“海葵”残涡造成广西东南部特大暴雨的成因进行分析。结果表明：(1)华南地区处于南亚高压东南侧的辐散区,500 hPa副热带高压减弱东退,西风槽东移引导弱冷空气南下,有利于“海葵”残涡长时间维持在广西东南部上空,冷暖空气交汇激发对流,产生特大暴雨。(2)低层季风气流加强,在广西东南部有西南风和东南风的辐合,充足的水汽输送到“海葵”残涡东侧堆积,中高层辐散、低层辐合的良好配置促进了上升运动发展,为特大暴雨的发生提供有利条件。(3)对流单体后向传播形成“列车效应”,回波质心低,抬升凝结高度低,以高效率的暖云降水为主,超低空急流对强降水的出现具有一定的指示作用。
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| 关 键 词： | 残涡 特大暴雨 冷空气 季风 水汽 |
| 收稿时间： | 2023/11/29 0:00:00 |
| 修稿时间： | 2024/1/24 0:00:00 |
Analysis of the causes of torrential rainfall event associated with the residual vortex of |
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| Lu Qiulin,Lin Quelue,Li Xiuchang,Wei Rong,Zhang Rongjing and Chen Minglu.Analysis of the causes of torrential rainfall event associated with the residual vortex of[J].Bimonthly of Xinjiang Meteorology,2024,18(4):183-190. |
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| Authors: | Lu Qiulin Lin Quelue Li Xiuchang Wei Rong Zhang Rongjing and Chen Minglu |
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| Institution: | Yulin Municipal Meteorological Service,537000,Yulin Municipal Meteorological Service,537000,Yulin Municipal Meteorological Service,537000,Yulin Municipal Meteorological Service,537000,Yulin Municipal Meteorological Service,537000,Yulin Municipal Meteorological Service,537000 |
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| Abstract: | Analyze the causes of torrential rainfall event in the southeastern Guangxi caused by the residual vortex of typhoon Haikui in September 2023, using various conventional meteorological data and ERA5 reanalysis data. The results show that: (1) South China is located in the divergence area on the southeastern side of the South Asian high, where the 500 hPa subtropical high weakens and retreats eastward, the eastward movement of the westerly trough guides weak cold air to move southward, facilitating the persistent presence of the residual vortex of typhoon Haikui over the southeastern Guangxi, the convergence of warm and cold air triggers convection, leading to heavy rainfall. (2) The low-level monsoonal airflow strengthens, resulting in convergence of southwest and southeast winds in the southeastern Guangxi, which transports abundant moisture to the eastern side of the residual vortex of typhoon Haikui, the favorable configuration of upper-level divergence and lower-level convergence promotes upward motion, providing favorable conditions for the occurrence of heavy rainfall. (3) The propagation of convective cells forms a "train effect" , with low echo centers and low lifting condensation levels, predominantly producing efficient warm cloud precipitation, the super-low-level jet indicates the occurrence of heavy precipitation to some extent. |
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| Keywords: | residual vortex extremely heavy rainfall cold air monsoon water vapour |
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