报告详情
Symmetric instability under inertially resonant winds
编号：1345
访问权限：仅限参会人
更新：2024-10-14 15:37:53 浏览：40次
张贴报告
报告开始：2025年01月16日 19:35（Asia/Shanghai）
报告时间：15min
所在会场：[S46] Session 46-Oceanic Mesoscale and Submesoscale Processes: Characteristics, Dynamics & Parameterizations [S46-P] Oceanic Mesoscale and Submesoscale Processes: Characteristics, Dynamics & Parameterizations
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摘要
When wind aligns with the geostrophic flow in the upper ocean (down-front wind), it induces a negative Ertel potential vorticity (EPV) flux, initiating symmetric instability (SI) along the frontal boundary. However, surface mixed layers (SMLs) are usually subjected to fluctuating wind forcing rather than a constant, unidirectional one. Notably, near-inertial wind components can inject significant kinetic energy into the upper ocean, forming strong near-inertial oscillations. These variations in wind forcing, along with the associated near-inertial oscillations, introduce additional complexities to the energy budget of the SML. In this study, we investigate the frontal SI dynamics using large-eddy simulations with a series of wind conditions. A refined dynamical decomposition method is developed to achieve a more refined analysis of interaction between different motions. Using this method, we demonstrate that available potential energy (APE) also plays a crucial role in energizing SI. Furthermore, periodic winds enhance near-inertial motions within the system thereby rendering ageostrophic shear production (AGSP) a progressively dominant mechanism in the energy transfer process. Ultimately, our refined decomposition framework enables a detailed assessment of the feedback exerted by SI on the broader system dynamics.
关键词
surface mixed layer,symmetric instability,inertial gravity waves,large eddy simulation
报告人
Jialin Cao
Master Xiamen University稿件作者
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重要日期
-
会议日期
01月14日
2025
至01月17日
2025
-
09月27日 2024
初稿截稿日期
-
12月14日 2024
注册截止日期
主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
联系方式
- JKejing GU
- xm******@xmu.edu.cn
- +86*********
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