CMG Collabortative Research: The Oceanic Internal Wave Energy Spectrum - Synthesis of Theory and Observations

CMG 合作研究：海洋内波能量谱 - 理论与观测的综合

• 批准号: 0417466
• 负责人: Kurt Polzin
• 金额: $ 21.84万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0417466&HistoricalAwards=false
• 关键词: CMG; Collabortative; Research; Oceanic; Internal

The proposed effort is a synthesis of theory and observations of theoceanic internal wavefield. The work proposed is a trulycollaborative effort: the analysis of oceanic observations to groundtruth new theoretical descriptions of internal wave dynamics. Thetheoretical work proposed involves the use of a novel Hamiltonianformalism for the internal wave field, recently developed by thePI's. This has already been shown to include the high--frequencycomponent of the celebrated Garret--Munk spectrum as an exactstatistically stationary solution, as well as to account for much ofthe observed spectral variability. It is proposed to develop aselection principle, based on a combination of wave turbulence andasymptotic analysis, to determine how each oceanic realization of thisvariability is tied to the local nature of the forcing anddissipation, as well as to the latitude dependence of the Coriolis effect.Water in the ocean abyss is denser than water at the surface. Thisdensity stratification permits a class of waves within the oceaninterior, called internal waves. These waves are apparent as thedistortion of density surfaces, and their wave-like properties are dueto the restoring force of gravity. Internal waves are one of themajor player in ocean dynamics, as they can propagate over bigdistances, interact with each other and other major players in theocean, like vorticity and currents, internal waves break and mixwater. While involved in this complex dynamics, internal wavesredistribute mass, momentum, energy and tracers in the ocean.Understanding internal waves is a key element to understanding climatevariability, especially over long time periods. The most difficultpiece of this puzzle is the interaction of internal waves. The investigatorshave already contributed significantly to the understanding ofnonlinear internal wave interactions by demonstrating the existence ofan infinite family of statistically stationary solutions for theinternal wave spectrum, of which the celebrated Garrett and Munkspectrum is a member. Now they propose to investigate whetherparticular members of this infinite family are more likely thanothers, as well as quantify the effects of interaction of internalwaves with other key players in the ocean. This research will beaided by the ongoing analysis of oceanic data sets and will contributecrucial missing components to the theory of ocean mixing, weather and,ultimately, climate.

拟议的努力是理论的综合和观察到了神学内部波场。 提出的作品是一项真正的努力：对内部波动力学的新理论描述的海洋观察分析。 提出的一项研究涉及将新型的汉密尔顿形式主义用于内部波场，该领域最近由ThePI开发。这已经显示出来包括著名的garret--munk频谱的高频组件，作为确切的固定固定解决方案，并考虑了许多观察到的光谱变异性。提议根据波湍流和响应分析的结合来开发异教原理，以确定这种变化的每种海洋实现如何与强迫和降解的局部性质相关，以及与水的纬度依赖性以及海洋中的水的纬度依赖性相比，海洋中的水比在表面上比浓度呈浓度。 此密度分层允许在海洋区内进行一类波浪，称为内波。这些波是密度表面的teDistortion显而易见的，它们的波形特性是重力恢复力的二重奏。 内部波浪是海洋动力学领域的主角之一，因为他们可以在大型距离上传播，相互互动，彼此和其他主要参与者，例如涡流和潮流，内部波浪中断和混合水。尽管参与了这种复杂的动力学，但内部的波动质量，动量，能量和示踪剂在海洋中。理解内部波是理解气候变化性的关键要素，尤其是在长时间内。 这个难题中最困难的是内波的相互作用。 研究人员已经通过证明了无限的统计固定溶液对内部波谱的统计固定解决方案的存在，已经为否则对诺线的内部波相互作用做出了重大贡献，著名的Garrett和Munkspectrum是成员。 现在，他们建议调查这个无限家族的特定成员是否比其他人更有可能，并量化了内部与海洋其他主要参与者相互作用的影响。 这项研究将通过对海洋数据集进行的持续分析来实现，并将为海洋混合，天气和最终气候的理论做出贡献。