西北太平洋复杂地形下内波动量通量及其对背景流场反馈的研究

西北太平洋是全球内波、中尺度涡、环流等海洋现象最活跃的区域之一，海底复杂地形引发的内波是联系这些多尺度海洋过程相互作用的桥梁。相比于能量角度，海洋内波引起的动量交换和传递的研究相对较少，而内波动量通量是海洋波流相互作用的重要参量，并且与海水物质输运直接相关。本项目聚焦于内波动量通量及其对背景流场影响这一有限目标，系统的建立内波-平均流相互作用的理论模型框架，考察海洋中打破非加速原理限制产生有效内波动量通量的条件，分析内波场各向异性、临界层、惯性层以及内波耗散对内波动量通量的影响。搭建包含黑潮和中尺度涡的西北太平洋内波模式，考察西北太平洋复杂地形产生的内波动量通量的时空分布特征和生成条件，评估内波引起的波动拖曳效应对背景流场强度和涡度的反馈作用，量化其对大洋物质循环的影响，并基于模式结果研究制定内波动量通量的观测方案。

The Northwest Pacific Ocean is one of the most energetic regions with internal waves, mesoscale eddies and circulation. Internal waves are a bridge to connect these multiple-scale processes. Compared with the energy analysis, studies on exchange and transfer of internal wave momentum are relatively limited, although the internal wave momentum flux is an important indicator for oceanic wave-mean-flow interaction and is directly related to material transport. In this project, we will focus on the impact of internal wave momentum flux on background currents. We will first set up a theoretical framework for internal wave and mean flow interaction, investigate the conditions to break the limit of the nonacceleration theorem, analyze the effects of asymmetric or anisotropic wave field due to internal wave generation, critical or inertial layers of background shear and internal wave dissipation, and also compute the internal wave drag. Using an internal wave model in the Northwest Pacific Ocean which include the Kuroshio and mesoscale eddies, we will extract the temporal and spatial characteristics of internal wave momentum flux generated by complex topography, evaluate its impact on the intensity and vorticity of background currents and quantify the influence on oceanic material transport. We will also design an observational plan for internal wave momentum based on the model results.