Hao Huang, Shi Qiu, Z. Zeng, Pengyang Song, Jiaqi Guo, Xueen Chen
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引用次数: 0
摘要
利用南海东北部嵌套高分辨率数值模式研究了吕宋海峡一对中尺度涡影响下的调制内孤波(ISWs)特征,这对中尺度涡包括由黑潮入侵诱发的一个反气旋涡(AE)和一个气旋涡(CE)。中尺度涡的存在极大地影响了 a 型和 b 型 ISW 的非线性演变。漩涡对造成了不同的波浪特性和能量演变。与 b 型波浪相比,a 型波浪显示出更明显的调制特征和更大的空间尺度。CE流和水平不均匀分层对波浪行为的调制至关重要,它们诱发了大振幅凹陷ISW。此后,AE 对波浪能量演化产生延缓效应。沿传播路径直至 AE 核心,a 型波的平均深度积分可用势能和动能分别相对增加了 -66.12% 和 -46.07%,b 型波则分别增加了 -24.26% 和 -20.15%。进一步向北传播的变形和扭曲的 ISW 波峰线表现出更剧烈的浅滩演变。在东沙环礁大陆架上,北站的 a 波和 b 波的最大总能量分别是南站的 13.5 倍和 3.5 倍。这项研究为了解南中国海深海盆地东北部中尺度涡对下的ISW动态变化提供了重要信息。
Modulation of internal solitary waves by one mesoscale eddy pair west of the Luzon Strait
The characteristics of modulated internal solitary waves (ISWs) under the influence of one mesoscale eddy pair in the Luzon Strait, involving one anticyclonic eddy (AE) and one cyclonic eddy (CE) induced by the Kuroshio intrusion, were investigated using a nested high-resolution numerical model in the northeastern South China Sea (SCS). The presence of mesoscale eddies greatly impacts the nonlinear evolution of type-a and type-b ISWs. The eddy pair contributes to distinct wave properties and energy evolutions. Compared to type-b waves, type-a waves display more pronounced modulatory characteristics with a larger spatial scale. CE currents and horizontal inhomogeneous stratification are crucial in modulating the wave behaviors, which induce large-amplitude depression ISWs. The AE thereafter yields retardation effects on the wave energy evolution. The average depth-integrated available potential and kinetic energy showed relative increases of −66.12% and −46.07%, respectively, for type-a waves, and −24.26% and −20.15% for type-b waves along the propagation path up to the AE core. The deformed and distorted ISW crest lines propagating further northward exhibit a more dramatic shoaling evolution. The maximum total energies of type-a and b waves at the north station are approximately 13.5 and 3.5 times greater than those at the south station on the continental shelf of the Dongsha Atoll. This work provides essential insights into modulated ISW dynamics under the mesoscale eddy pair within the northeastern SCS deep basin.
期刊介绍:
The Journal of Physical Oceanography (JPO) (ISSN: 0022-3670; eISSN: 1520-0485) publishes research related to the physics of the ocean and to processes operating at its boundaries. Observational, theoretical, and modeling studies are all welcome, especially those that focus on elucidating specific physical processes. Papers that investigate interactions with other components of the Earth system (e.g., ocean–atmosphere, physical–biological, and physical–chemical interactions) as well as studies of other fluid systems (e.g., lakes and laboratory tanks) are also invited, as long as their focus is on understanding the ocean or its role in the Earth system.