Analyzing coherent structures in the tropical cyclone boundary layer using large eddy simulations

IF 2.4 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Shanghong Wang , Jie Tang
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引用次数: 0

Abstract

Turbulence within the tropical cyclone boundary layer plays a crucial role in the exchange of heat, moisture, and momentum between the surface and the atmosphere. This study investigates the characteristics of coherent structures, specifically streaks and rolls, using large eddy simulations. Our results highlight significant differences across the three radius cases, with smaller radius exhibiting more intense and organized turbulence and streak/roll structures. Our analyses reveal that thermodynamic conditions significantly impact the timing of initial streak/roll development but do not affect their intensity in the steady state. Wind structures closer to the tropical cyclone center lead to stronger and more rapidly developing streaks/rolls, indicating their critical role in determining the intensity and formation of these features. Sensitivity tests on the Coriolis parameter (f) and radial decay parameter of tangential wind (n) show minimal impact on the development of streaks/rolls, suggesting these factors are less influential compared to wind and thermodynamic conditions.
利用大涡模拟分析热带气旋边界层的相干结构
热带气旋边界层内的湍流在地表与大气之间的热量、水分和动量交换中起着至关重要的作用。本研究利用大涡模拟研究了相干结构的特征,特别是条纹和卷。我们的研究结果表明,三种半径情况下的湍流和条纹/卷状结构存在明显差异,小半径情况下的湍流和条纹/卷状结构更强烈、更有组织。我们的分析表明,热动力条件对初始条纹/滚动发展的时间有显著影响,但并不影响它们在稳定状态下的强度。更靠近热带气旋中心的风结构会导致更强、发展更快的条纹/卷流,这表明它们在决定这些特征的强度和形成方面起着关键作用。对科里奥利参数(f)和切向风径向衰减参数(n)的敏感性测试表明,它们对条纹/卷的发展影响极小,表明与风和热力条件相比,这些因素的影响较小。
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来源期刊
Tropical Cyclone Research and Review
Tropical Cyclone Research and Review METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.60
自引率
3.40%
发文量
184
审稿时长
30 weeks
期刊介绍: Tropical Cyclone Research and Review is an international journal focusing on tropical cyclone monitoring, forecasting, and research as well as associated hydrological effects and disaster risk reduction. This journal is edited and published by the ESCAP/WMO Typhoon Committee (TC) and the Shanghai Typhoon Institute of the China Meteorology Administration (STI/CMA). Contributions from all tropical cyclone basins are welcome. Scope of the journal includes: • Reviews of tropical cyclones exhibiting unusual characteristics or behavior or resulting in disastrous impacts on Typhoon Committee Members and other regional WMO bodies • Advances in applied and basic tropical cyclone research or technology to improve tropical cyclone forecasts and warnings • Basic theoretical studies of tropical cyclones • Event reports, compelling images, and topic review reports of tropical cyclones • Impacts, risk assessments, and risk management techniques related to tropical cyclones
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