Regional Studies of Internal Tides from Altimetry

OCE-0623540智能价值表层潮汐产生的内波是垂直混合深海的潜在能源。迄今为止，对测高数据的分析提供了表面潮汐能量损失的全球总比例尺地图，以及在公海传播的低模内潮的定性图像。然而，仍然存在许多重要的问题，特别是关于内潮损失的能量的过程、速度和空间分布。将利用原始方程模式的广义反演同化卫星测高数据，对世界海洋一系列区域的内潮进行分析。主要目的是研究不同地形(岛弧、大洋中脊和深海平原)、相对于临界纬度的位置以及靠近大陆架的地点的内潮的产生、传播和消散，并评估中尺度和季节变化对从测高得出的调和常数的影响。对一系列不同地点的相互比较，包括绘制低模内部潮汐能量通量图，以及分析数据同化解决方案中的残差，将使基于相对稀疏的潮汐和混合的现场测量得出的推论得以推广，并有助于阐明内部潮汐消散的机制。广泛影响潮汐驱动的混合即使在当前一代海洋气候模式中表现得很差，也很差，这项研究将直接与正在开发能量一致的海洋混合参数的研究人员有关。内部潮汐的详细地图还将为目前在轨的多个飞行任务所获得的高度测量提供二阶潮汐校正，这些飞行任务目前用于研究中尺度和较长期的过程。此外，本研究中改进和开发的计算工具将有助于建立利用数据同化方法的区域海洋预报系统。

OCE-0623540Intellectual MeritInternal waves generated by the surface tide are a potential source of energy for vertically mixing the deep ocean. To date, analysis of altimetry data has provided gross global scale maps of energy lost from the surface tide, as well as a qualitative picture of low-mode internal tides propagating in the open ocean. However, many important questions remain, especially with regard to the processes, rate and spatial distribution of energy loses from the internal tide. An analysis of the internal tide at a suite of regions in the world ocean will be conducted using the generalized inversion of a primitive-equation model to assimilate satellite altimetry data. The main goal is to study the generation, propagation, and dissipation of the internal tide at sites which differ in topography (island arcs, mid-ocean ridges, and abyssal plains), position relative to the critical latitude, and proximity to the continental shelf, and assess the impact of mesoscale and seasonal variability on harmonic constants inferred from altimetry. Intercomparison of a range of different sites, including mapping of low-mode internal tide energy fluxes, and analysis of residuals in the data assimilation solutions, will permit the generalization of inferences based on relatively sparse in situ measurements of the tides and mixing, and help to elucidate mechanisms for the dissipation of the internal tides.Broader ImpactsTidally driven mixing is poorly if at all represented in the current generation of ocean climate models, and this study will be directly relevant to researchers who are developing energetically consistent parameterizations for ocean mixing. The detailed maps of the internal tide will also provide a second-order tidal correction for altimetry obtained by the multiple missions now in orbit which are currently used to study mesoscale and longer-term processes. In addition, the computational tools refined and developed in this study will be useful in the creation of regional ocean prediction systems that utilize data-assimilative methodologies.