Numerical Simulation of Tornado-like Vortices Induced by Small-Scale Cyclostrophic Wind Perturbations

被引：0

作者：

Liu, Yuhan ^{[1
]}

Jiang, Yongqiang ^{[1
]}

Chen, Chaohui ^{[1
]}

Zhang, Yun ^{[1
]}

He, Hongrang ^{[2
]}

Chen, Xiong ^{[1
]}

Zhong, Ruilin ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Meteorol & Oceanog, Changsha 410073, Peoples R China

[2] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Peoples R China

来源：

ATMOSPHERE | 2025年 / 16卷 / 01期

基金：

中国国家自然科学基金;

关键词：

tornado; numerical simulation; tornado-like low; small scale; SURFACE VERTICAL VORTICITY; DOPPLER RADAR OBSERVATIONS; ANTICYCLONIC TORNADOES; SUPERCELL; OKLAHOMA; WSR-88D;

D O I：

10.3390/atmos16010108

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study introduces a tornado perturbation model utilizing the cyclostrophic wind model, implemented through a shallow-water equation framework. Four numerical experiments were conducted: a single cyclonic wind perturbation (EXP1), a single low-geopotential height perturbation (EXP2), a cyclonic wind perturbation with a 0 Coriolis parameter (EXP3), and a single anticyclonic wind perturbation (EXP4). The outputs showed that in a static atmosphere setting, a small-scale cyclonic wind perturbation generated a tornado-like pressure structure. The centrifugal force in the central area exceeded the pressure gradient force, causing air particles to flow outward, leading to a pressure drop and strong pressure gradient. The effect of the Coriolis force is negligible for meso-gamma-scale and smaller systems, while for meso-beta-scale and larger systems, it begins to have a significant impact. The results indicate that a robust cyclonic and an anticyclonic wind field can potentially generate a pair of cyclonic and anticyclonic tornadoes when the horizontal vortex tubes in an atmosphere with strong vertical wind shear tilt, forming a pair of positive and negative vorticities. These tornadoes are similar but have different rotation directions.

引用

页数：19