[1]林确略,杨延志,黄小燕,等.台风“海葵”残涡长久维持及引发广西极端强降水成因分析[J].气象研究与应用,2023,44(04):14-22.[doi:10.19849/j.cnki.CN45-1356/P.2023.4.03]
　LIN Quelue,YANG Yanzhi,HUANG Xiaoyan,et al.Analysis of the causes of an extreme rainfall event in Guangxi induced by the long-lasting maintenance of the residual vortex of typhoon “HaiKui”[J].Journal of Meteorological Research and Application,2023,44(04):14-22.[doi:10.19849/j.cnki.CN45-1356/P.2023.4.03]
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台风“海葵”残涡长久维持及引发广西极端强降水成因分析()
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气象研究与应用[ISSN:1673-8411/CN:45-1356/P]

卷:
第44卷
期数:
2023年04期
页码:
14-22
栏目:
2023年广西极端降水
出版日期:
2023-12-15

文章信息/Info

Title:
Analysis of the causes of an extreme rainfall event in Guangxi induced by the long-lasting maintenance of the residual vortex of typhoon “HaiKui”
作者:
林确略1;  杨延志1;  黄小燕2;  张容菁1;  陈明璐1
1. 玉林市气象局, 广西 玉林 537000;
2. 广西壮族自治区气象科学研究所, 南宁 530022
Author(s):
LIN Quelue1;  YANG Yanzhi1;  HUANG Xiaoyan2;  ZHANG Rongjing1;  CHEN Minglu1
1. Yulin Meteorological Bureau, Guangxi Yulin 537000, China;
2. Institute of Meteorological Sciences of Guangxi, Nanning 530022, China
关键词:
台风; 残涡; 长久维持; 极端强降水; 辐合渐近线
Keywords:
Typhoon; residual vortex; long-lasting; extreme rainfall; convergent asymptote
分类号:
P458
DOI:
10.19849/j.cnki.CN45-1356/P.2023.4.03
摘要:
基于实况观测数据、欧洲中期天气预报中心全球气候第五代大气再分析数据集(ERA5)、风云气象卫星四号A星(FY4A)红外云图以及玉林双偏振雷达等资料,对2023年台风"海葵"残涡复杂路径、长久维持原因及引发广西极端强降水的成因进行分析。结果表明:(1)残涡前期为三面高压坝阻拦,主要受大陆高压南侧弱偏东气流的引导缓慢西行。后期夹在两个高压之间的鞍型场中,随着大陆高压的减弱以及西南季风的增强,引导气流随之发生转换。这是"海葵"长久维持、一度在桂东南回旋的环流背景。(2)纬向带状弱的垂直风切变,"海葵"涡旋系统结构在中低层保持相对完整,残涡东侧始终与西南季风相连及下游暖区为残涡提供的能量补给,是有利残涡长时间维持的重要因素。(3)多种动力影响因子呈现不对称分布,且随着残涡移动而发生变化,导致残涡强降水落区位置发生相应变化。随着残涡进入广西,其东南侧的辐合渐近线趋于靠近残涡中心,残涡在桂东南长时间的回旋停留,卷入的西南季风与东南风的辐合形成螺旋雨带,"列车效应"长时间影响桂东南是造成该地区极端强降水的主要原因。
Abstract:
Based on actual observation, ERA5 Reanalysis data, FY4A infrared cloud image, and SA band dual polarization radar data of Yulin, the causes of complex path, long-term maintenance and extreme rainfall in Guangxi by the residual vortex of typhoon "HaiKui" are analyzed. The results show as follows:(1)The residual vortex is blocked by a three-sided high pressure dam in the early stage, and is mainly guided by the weak easterly airflow on the south side of the continental high pressure to travel slowly westward; in the late stage, it is sandwiched in a saddle field between the two highs, and as the continental high pressure weakens and the southwesterly monsoon strengthens, the guiding airflow changes. The above is the circulation background of the residual vortex which maintained for a long time and once circled in the southeast of Guangxi.(2)Zonally banded and weak vertical wind shear in the easterlies, the structure of "HaiKui" vortex system remains relatively integral in the middle and low layers, the eastern side of the residual vortex is always connected with the southwest monsoon, and the warm area downstream provides energy for the residual vortex. They are favorable factors for the long-term maintenance of residual vorticity. (3)A variety of dynamic factors present asymmetric distribution, and with the movement of the residual vortex changing, resulting in the corresponding change of the location of the heavy precipitation of the residual vortex. The convergence asymptote on the southeast side of the remnant vortex tends to be close to the center of the remnant vortex as the remnant vortex enters Guangxi, the spiral rain belt is formed by the lingering of the remnant vortex in the southeast of Guangxi and the convergence of the involved southwest monsoon and southeast wind, and the train effect affecting the southeast of Guangxi for a long time is the main reason for the extreme heavy rainfall in the southeast of Guangxi.

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备注/Memo

备注/Memo:
收稿日期:2023-12-1。
基金项目:广西气象科研计划(桂气科2023ZL11)、广西气象青年人才培养项目(桂气科2023QN13)
作者简介:林确略(1982-),男,正高级工程师,从事短期天气预报和灾害性天气研究。E-mail:l_ql@163.com
通讯作者:黄小燕(1978-),女,正高级工程师,博士,从事天气预报技术研究。E-mail:gx_huangxy@163.com
更新日期/Last Update: 1900-01-01