| 云南文山一次低涡暴雨成因初探 |
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| 引用本文： | 董兴欣,冯德花,黎霖.云南文山一次低涡暴雨成因初探[J].云南地理环境研究,2020(1):71-76,F0003. |
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| 作者姓名： | 董兴欣 冯德花 黎霖 |
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| 作者单位： | 文山州气象局 |
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| 基金项目： | 文山州气象局2019年科研项目. |
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| 摘 要： | 利用FY2G卫星云图、雷达资料、自动雨量站等观测资料和NCEP/NCAR逐6 h 2.5°×2.5°再分析资料对2018年6月22日~25日云南省文山州大暴雨天气过程进行分析。结果表明,此次暴雨过程的主要影响系统是两高之间的辐合区和低涡切变线。由于高原槽不断东移加深,孟湾低压与印度半岛低压系统合并加强,西太平洋副热带高压加强西伸,文山州受强偏南气流影响,产生强烈水汽辐合,造成持续强降水;不断有对流单体发展且合并到大的对流云团中,有较大范围的对流云团持续影响是此次大暴雨的主要云图特征;雷达上持续存在“S”型径向速度图,且存在较强降水回波在文山附近生消发展,造成明显的“列车效应”。
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| 关 键 词： | 暴雨 两高辐合区 低涡 切变线 列车效应 |
A PRELIMINARY STUDY OF THE LOW-VORTEX RAINSTORM OF WENSHAN PREFECTURE IN YUNNAN PROVINCE |
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| DONG Xing-xin,FENG De-hua,LI Lin.A PRELIMINARY STUDY OF THE LOW-VORTEX RAINSTORM OF WENSHAN PREFECTURE IN YUNNAN PROVINCE[J].Yunnan Geographic Environment Research,2020(1):71-76,F0003. |
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| Authors: | DONG Xing-xin FENG De-hua LI Lin |
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| Institution: | (Wenshan Prefecture Meteorological Bureau of Yunnan Province,Wenshan 663000,Yunnan,China) |
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| Abstract: | Based on FY2G satellite cloud image,radar data,automatic rain gauge data and NCEP/NCAR 2.5°×2.5°6 h reanalysis data,the low-vortex rainstorm weather process occurred in Wenshan form 22 to 25 June,2018 was analyzed.The results show that the main large-scale influencing systems of the rainstorm process were the convergence zone between two high pressure and low-vortex shear line in lower atmosphere.As a result of the plateau trough was moved eastward and deepened constantly,the low pressure in the bay of Bengal was merged and strengthened with the low pressure system in the Indian peninsula,and the West Pacific subtropical high was moved westward and strengthened,Wenshan was effected by the strong southerly airflow,resulting in strong convergence of water-vapor and causing sustained heavy rainfall;There was growing convection cells developed and merged into the mesoscale convective clouds,Affected continuously by the large convective clouds was the main cloud image feature of the rainstorm;Radar data shows that a“S”type radial velocity graph existed continuously,and the echo of heavy precipitation was generated and dissipated near Wenshan,resulting in an obvious“train effect”. |
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| Keywords: | rainstorm convergence zone between two high pressure low-vortex shear line train effect |
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