Energetics of Internal Tides and Lee Waves Under Different Background Flow Intensities  

作　　者：JIANG Zenghao CHEN Xu MENG Jing CAO Anzhou 

机构地区：[1]Key Laboratory of Physical Oceanography,Ocean University of China,Qingdao 266100,China [2]Ocean College,Zhejiang University,Zhoushan 316021,China

出　　处：《Journal of Ocean University of China》2025年第2期259-268,共10页中国海洋大学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.41876015)。

摘　　要：Ocean mixing is a consequence of essential dynamic processes such as internal tides and lee waves that occur near the seafloor topography.Internal tides and lee waves are generated by barotropic tidal currents and geostrophic flows,respectively.Ocean current is composed of multiple flows;thus,internal tides and lee waves occur concurrently in the real ocean.In this paper,the Massachusetts Institute of Technology general circulation model(MITgcm)is used to conduct 2D numerical experiments.By varying background flow intensities,the energy and dissipation relationship between internal tides and lee waves are investigated.The results reveal that the internal tide beams become asymmetric due to the influence of Doppler shift.The lee wave structure gradually leads the wave field when the background flow velocity rises constantly.The presence of a background flow increases the energy portion of the high-mode wave by up to 15%-20%.Moreover,strong shear,owing to the background flow,considerably increases dissipation.When the background flow velocity is higher than the barotropic tidal current velocity,the isopycnal overturn triggered by the lee wave generates a dissipation of the same order of magnitude as the shear.

关 键 词：internal tides lee waves ENERGETICS turbulent dissipation rate 

分 类 号：P731.2[天文地球—海洋科学]