唐嘉蕙^1,2,,
冉令坤²,
沈新勇^1,,,
炎利军³
1. 南京信息工程大学气象灾害教育部重点实验室, 气候与环境变化国际合作联合实验室, 气象灾害预报预警与评估协同创新中心, 南京 210044
2. 中国科学院大气物理研究所, 北京 100029
3. 佛山市气象局龙卷风研究中心, 广东佛山 528000

基金项目: 国家重点基础研究发展计划（2015CB452804），广州市科技项目（201604020069），国家自然科学基金项目（41575065，4177510，41530427）和重大研究计划项目（91437215）资助


详细信息

作者简介: 唐嘉蕙, 女, 1995年生, 硕士, 从事中小尺度大气动力学研究.E-mail:jiahui_t@126.com

通讯作者: 沈新勇, 男, 1964年生, 教授, 博士生导师, 从事台风和中尺度气象学研究.E-mail:shenxy@nuist.edu.cn

中图分类号: P445

收稿日期:2018-08-13
修回日期:2019-01-21
上线日期:2019-11-05

High-resolution numerical simulation of the EF3 tornadic storm in Foshan city, Guangdong Province

TANG JiaHui^1,2,,
RAN LinKun²,
SHEN XinYong^1,,,
YAN LiJun³
1. Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
2. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
3. Foshan Meteorological Bureau Tornado Research Center, Guangdong Foshan 528000, China


More Information

Corresponding author: SHEN XinYong,E-mail:shenxy@nuist.edu.cn

MSC: P445

--> Received Date: 13 August 2018
Revised Date: 21 January 2019
Available Online: 05 November 2019


摘要
摘要:本文对2015年10月4日发生于广东佛山地区台风"彩虹"登陆后螺旋云带中的一次强龙卷风过程进行高分辨率（148 m，48 m）数值模拟，结果产生了类龙卷涡旋（Tornado-Like Vortex，TLV），最接近观测到的龙卷风，并对龙卷超级单体及产生龙卷的TLV系统的三维动热力精细化结构进行诊断分析.结果表明，此次龙卷产生于超级单体右侧边缘，钩状回波显著，伴有明显的中气旋活动.模拟的龙卷超级单体与之前观测研究和理想化建模的龙卷超级单体结构相类似，超级单体后部云墙之下低层水成物呈现狭窄的触地漏斗状结构，对应低层的TLV系统；TLV具有中心气流下沉和周围气流上升的动力结构，对应上宽下窄的强烈涡管.与之前的研究相比，本次台风螺旋云带中的超级单体中后部入流较弱，出流较强，其前部气流上升存在水合物聚集.相对螺旋度（Storm Relative Helicity，SRH）的分析表明，超级单体的发展伴随正负SRH的增大，龙卷发生在SRH正负高值区的交界处.
关键词: 龙卷/
类龙卷涡旋/
超级单体/
螺旋度

Abstract:The tornado studied in this paper occurred in the external airflow after the typhoon Mujigae landed on 4 Oct 2015 at Foshan City. Using the Weather Research and Forecasting (WRF) model, this storm was numerically modeled at a high resolution with 148 m grid and a 48 m grid spacing, respectively. Analysis and diagnosis of the model results permit to reveal the three-dimensional dynamic structure of the tornadic storm and Tornado-Like Vortex (TLV), which are very close to the observed process. Results show that this tornado occurred on the right edge of the supercell, accompanied by an obvious hook echo and mesocyclone. The simulated tornadic supercell is similar to the previously observed and the idealized supercell model. On the one hand a small branch of hydrate funnels is generated at the rear of supercell at the low layer which reflects the low-level TLV system. On the other hand, the center of the TLV sinks and periphery rises, corresponding to a strong vortex. Compared with previous studies, the supercell in typhoon spiral cloud bands has a weaker inflow and a stronger outflow. And the air rises at the front of the moving direction with hydrometeor aggregation. The analysis of Storm Relative Helicity (SRH) indicates that the development of tornadic storm was accompanied by the increase of positive and negative SRH, and occurred at the junction between SRH positive and negative high value areas.
Key words:Tornado/
Tornado-Like Vortex/
Supercell/
Helicity



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