Inertia-Gravity Wave Generation from Unsteady Ocean Currents

这个项目使用直接数值模拟来研究内部重力波辐射的有效性，这些辐射来自快速变化的几乎是地转流。主要的科学动机是确定这样一个过程在多大程度上可以解释海洋中远离边界的内波辐射的背景水平。这项工作的指导是对海洋锋面附近高内波能的观测和对大气中斜压涡旋生命周期中重力波辐射的数值研究。该方法采用两种高空间分辨率的数值模型，即流体静力等压模型（HIM）和非流体静力Navier-Stokes解算器（S-FIT）来研究斜压射流不稳定性的非线性演化。该项目包括使用一种新的诊断工具来分离内波分量。将采用平衡模型来反演位涡场。由此产生的平衡旋涡流将从完整的流量中减去。

0137533/LelongThis project uses direct numerical simulation to look at the effectiveness of internal gravity wave radiation from rapidly varying almost geostrophic currents. The primary scientific motivation is to determine to what degree such a process could explain the background level of internal wave radiation in the ocean, away from boundaries. The work is guided both by observations of high internal wave energy near oceanic fronts and by numerical studies of the radiation of gravity waves during the life cycle of baroclinic eddies in the atmosphere. The approach consists of using two types of numerical models, a hydrostatic isopycnal model (HIM) and a non-hydrostatic Navier-Stokes solver (S-FIT), at high spatial resolution to examine the nonlinear evolution of instabilities on a baroclinic jet. The project includes the use of a novel diagnostic tool for separating the internal wave component. A balanced model will be used to invert the potential vorticity field. The resulting balanced vortical flow will then be subtracted from the full flow.