Inertia-Gravity Wave Generation from Unsteady Ocean Currents

不稳定洋流产生的惯性重力波

• 批准号: 0137533
• 负责人: Marie-Pascale Lelong
• 金额: $ 37.69万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-15 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0137533&HistoricalAwards=false
• 关键词: Inertia; Gravity; Wave; Generation; Unsteady

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.

0137533/Lelong该项目使用直接数值模拟来研究快速变化的几乎地转流的内部重力波辐射的有效性。 主要的科学动机是确定这种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。 指导这项工作的是海洋锋附近高内波能量的观测和大气中斜压涡旋生命周期期间重力波辐射的数值研究。 该方法包括使用两种类型的数值模式，流体静力学等密度模式（HIM）和非流体静力学Navier-Stokes方程求解器（S-FIT），在高空间分辨率检查的非线性演化的不稳定性的斜压急流。 该项目包括使用一种新的诊断工具来分离内波分量。 将使用平衡模式来反演位涡场。 然后从全流量中减去所产生的平衡涡流。