NSFGEO-NERC: Stimulated Loss of Balance

NSFGEO-NERC：刺激失去平衡

• 批准号: NE/R006652/1
• 负责人: Jacques Vanneste
• 金额: $ 27.02万
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FR006652%2F1
• 关键词: NSFGEO; NERC; Stimulated; Loss; Balance

Recent results obtained by the PIs show that the advection and refraction of near-inertial waves (NIWs) by mesoscale flow is necessarily accompanied by a transfer of energy from the mesoscale to NIWs: the presence of externally forced NIWs stimulates a loss of energy from the geostrophically and hydrostatically balanced component of the flow. This process, stimulated loss of balance (SLOB), should be contrasted with the much more studied and weaker process known as spontaneous loss of balance. The spontaneous version occurs at order one Rossby number and without externally forced waves. But the stimulated version is active even at small Rossby number and hence, we hypothesize, throughout the ocean. The main objectives of this proposal are to assess and develop the hypothesis that SLOB plays a major role in the mesoscale energy budget, and to investigate SLOB by components of the internal wave spectrum other than NIWs, particularly the internal tide (IT). This will be achieved by the development of new, phase-averaged models coupling the dynamics of internal waves with that of the balanced mesoscale flow, and through numerical solution of both these models and of the three-dimensional Boussinesq equations. The outcome will be a quantitative understanding of the role played by SLOB in the ocean energy budget.

最近的研究结果表明，近惯性波（NIWs）的平流和折射的中尺度流必然伴随着能量从中尺度到NIWs的转移：外部强迫NIWs的存在刺激能量损失的地转和流体静力平衡的流分量。这个过程，刺激失去平衡（SLOB），应该与更多的研究和较弱的过程称为自发失去平衡。自发版本发生在一阶Rossby数和没有外部强迫波。但刺激的版本是活跃的，即使在小的Rossby数，因此，我们假设，在整个海洋。本建议的主要目标是评估和发展的假设，SLOB中起着重要作用的中尺度能量收支，并调查SLOB的组成部分的内波频谱以外的NIWs，特别是内潮（IT）。这将通过开发新的、将内波动力学与平衡中尺度流动力学相耦合的相位平均模型，并通过这些模型和三维Boussinesq方程的数值解来实现。其结果将是对SLOB在海洋能源预算中所起作用的定量理解。

项目成果

Unsteady Ekman--Stokes dynamics: implications for surface-wave induced drift of floating marine litter

不稳定的埃克曼--斯托克斯动力学：对漂浮海洋垃圾表面波诱导漂移的影响

• DOI: 10.1002/essoar.10503364.1
• 发表时间: 2020
• 作者: Higgins C

Scattering of internal tides by barotropic quasigeostrophic flows

正压准地转流对内潮汐的散射

• DOI: 10.48550/arxiv.1804.06347
• 发表时间: 2018
• 作者: Savva M

Inertia-gravity-wave diffusion by geostrophic turbulence: the impact of flow time dependence

地转湍流引起的惯性重力波扩散：流动时间依赖性的影响

• DOI: 10.1017/jfm.2023.83
• 发表时间: 2023
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Cox M

Lagrangian transport by deep-water surface gravity wavepackets: effects of directional spreading and stratification

• DOI: 10.1017/jfm.2019.877
• 发表时间: 2020-01-25
• 期刊: JOURNAL OF FLUID MECHANICS
• 影响因子: 3.7
• 作者: Higgins, C.;van den Bremer, T. S.;Vanneste, J.
• 通讯作者: Vanneste, J.

Wave-averaged balance: a simple example

波浪平均余额：一个简单的例子

• DOI: 10.1017/jfm.2020.1032
• 发表时间: 2021
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Kafiabad, Hossein A.;Vanneste, Jacques;Young, William R.
• 通讯作者: Young, William R.