副热带西北太平洋向西移动的反气旋涡旋对近惯性波的向下传播和捕获

IF 2.8 2区 地球科学 Q1 OCEANOGRAPHY Journal of Physical Oceanography Pub Date : 2023-06-06 DOI:10.1175/jpo-d-22-0226.1
Zifei Chen, F. Yu, Zhiwu Chen, Jianfeng Wang, Feng Nan, Qiang Ren, Yibo Hu, A. Cao, Tongtong Zheng
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引用次数: 0

摘要

中尺度涡旋可以改变惯性波附近产生的风的传播。与以往的研究不同,地下系泊观测到的NIW是在反气旋涡(ACE)外产生的,然后与到达的ACE相互作用。研究发现,随着ACE的到来,NIW加速向下传播,NIW的最大垂直波长和群速度分别达到~500m和~35m/天。当进入ACE的核心时,近惯性能量被捕获,并最终在临界深度处失速,该临界深度基本上对应于位于750米左右深度的ACE底部。通过射线追踪模型和动态分析,这个临界深度比直接在ACE内生成的NIW要深得多。通过使用深度时变分层和相对涡度,射线追踪实验进一步证明,在外部产生并通过ACE的NIW可以传播到深部。此外,能量预算分析表明,从ACE到NIW的净能量转移在增强向下传播的近惯性能量及其在临界层的长期持续性(~45天)方面发挥着重要作用。在临界层内,剪切不稳定性的增强和内波之间的非线性相互作用导致了近垂直能量的损失,并为提供深海混合提供了能量。
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Downward Propagation and Trapping of Near-Inertial Waves by a Westward-moving Anticyclonic Eddy in the Subtropical Northwestern Pacific Ocean
Mesoscale eddies can alter the propagation of wind-generated near-inertial waves (NIWs). Different from previous studies, the subsurface mooring observed NIWs are generated outside an anticyclonic eddy (ACE) and then interact with the arriving ACE. It is found that with the arrival of the ACE, the NIWs accelerate to propagate downward and the maximum vertical wavelength and group velocity of NIWs reach ~500 m and ~35 m/day, respectively. When entering the core of the ACE, the near-inertial energy is trapped, and finally stalls at a critical depth, which basically corresponds to the base of the ACE located at around 750 m depth. Through a ray-tracing model and dynamic analyses, this critical depth is much deeper than that of NIWs generated directly inside an ACE. By using depth-time varying stratification and relative vorticity, ray-tracing experiments further demonstrate that NIWs generated outside and passed over by an ACE can propagate to deep depths. Furthermore, energy budget analyses indicate that the net energy transfer from the ACE to NIWs plays an important role in the enhancement of downward-propagating near-inertial energy and its long-term persistence (~45 days) in the critical layer. Within the critical layer, the enhancement of shear instability and nonlinear interactions among internal waves account for the loss of the trapped near-in ertial energy and provide energy for furnishing deep ocean mixing.
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来源期刊
CiteScore
2.40
自引率
20.00%
发文量
200
审稿时长
4.5 months
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.
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