[1]郑贤,黄莉,李紫甜,等.南宁市一次非汛期暖区极端短时强降雨形成原因分析[J].气象研究与应用,2024,45(02):120-125.[doi:10.19849/j.cnki.CN45-1356/P.2024.2.20]
　ZHENG Xian,HUANG Li,LI Zitian,et al.Analysis on causes of the extreme warm-sector short-time heavy rainfall during non-flood season in Nanning[J].Journal of Meteorological Research and Application,2024,45(02):120-125.[doi:10.19849/j.cnki.CN45-1356/P.2024.2.20]
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南宁市一次非汛期暖区极端短时强降雨形成原因分析()
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气象研究与应用[ISSN:1673-8411/CN:45-1356/P]

卷:
第45卷
期数:
2024年02期
页码:
120-125
栏目:
技术总结
出版日期:
2024-06-15

文章信息/Info

Title:
Analysis on causes of the extreme warm-sector short-time heavy rainfall during non-flood season in Nanning
作者:
郑贤1;  黄莉1;  李紫甜1;  郭雨奇2;  周琰1
1. 南宁市气象局 南宁 530022;
2. 南宁市邕宁区气象局 南宁 530200
Author(s):
ZHENG Xian1;  HUANG Li1;  LI Zitian1;  GUO Yuqi2;  ZHOU Yan1
1. Nanning Meteorological Bureau, Nanning 530022, China;
2. Yongning District Meteorological Bureau, Nanning 530200, China
关键词:
极端短时强降雨; 双低空急流; 中尺度露点锋; 弱强迫环境
Keywords:
extreme short-time heavy rainfall; double low-level jets; mesoscale dew-point front; weak forcing environment
分类号:
P458.1+21.1
DOI:
10.19849/j.cnki.CN45-1356/P.2024.2.20
摘要:
利用探空、卫星云图、多普勒雷达及加密自动观测资料，分析南宁市2020年3月25日极端短时强降雨的形成原因。结果表明，此次过程没有切变线及锋面参与，是一次弱强迫环境下的暖区暴雨过程，两支高空槽的存在提供天气背景场：高原槽东移使南宁上空处于上干冷下暖湿的对流不稳定状态，高原槽与副高的对峙促进低层双低空南风急流的生成和维持；南支槽则从抬升暖湿气流、槽前正涡度辐合上升及引导暖湿水汽输送三个方面为强降雨的发生提供优越的动力、热力和水汽条件；双低空南风急流为极端短时强降水提供充足的水汽和热力条件，超低空急流出口区的辐合和低空急流入口区的辐散出现的耦合配置，加强中尺度抬升和水汽辐合，促进对流的发生；925 hPa急流顶端的暖湿气团与桂北相对干冷气团形成的露点锋，是对流不稳定能量爆发的触发机制，在925 hPa东南急流顶端，露点锋南侧形成此次过程的最强降雨。
Abstract:
The causes of the formation of extreme short-time heavy rainfall in Nanning on March 25th， 2020 was analyzed by using sounding data，satellite cloud images，Doppler radar and encrypt automatic observations. The results show that it is a warm-sector heavy rainfall process under a weak forcing environment without the involvement of shear lines and fronts. There are two upper-air troughs that provide the weather background. The plateau trough moving east makes the air over Nanning in a state of convection instability with dry and cold air above and warm and wet air below，and the confrontation between the plateau trough and the subtropical high promotes the formation and maintenance of the double-low-level southerly jets. On the other hand，the south-branch trough provides excellent power，heat and water vapor conditions for the occurrence of heavy rainfall in terms of lifting up the warm and wet air flow，rising up of positive vorticity in front of the trough，and guiding the warm and wet water vapor transport. The double low-level southerly jets provide sufficient water vapor and thermal conditions for the extreme short-time heavy rainfall. The coupling configurations of convergence in the exit area of the ultra-low-level jet and divergence in the entrance area of the low-level jet strengthen the mesoscale uplift and water vapor convergence，and then promote the occurrence of convection. The dew-point front，which is formed by the warm and humid air mass at the top of the 925 hPa jet and the relatively dry and cold air mass in northern Guangxi，is the triggering mechanism for the convective unstable energy outburst. The heaviest rainfall occurs at the top of the 925 hPa southeasterly jets，where is also at the south side of the dew-point front.

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备注/Memo

备注/Memo:
收稿日期:2024-3-3。
基金项目:广西人工智能天气预报技术创新团队项目、大城市智慧气象服务与应用创新团队项目及桂气科2023M12、桂气科2023QN09项目
作者简介:郑贤，主要从事天气预报服务研究。E-mail:705075465@qq.com
通讯作者:黄莉，主要从事灾害性天气预报服务研究。E-mail:1162307446@qq.com
更新日期/Last Update: 1900-01-01