NSFGEO-NERC Scattering of ocean surface gravity waves by submesoscale turbulence

NSFGEO-NERC 亚尺度湍流对海洋表面重力波的散射

• 批准号: NE/W002876/1
• 负责人: Jacques Vanneste
• 金额: $ 30.95万
• 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: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FW002876%2F1
• 关键词: NSFGEO; NERC; Scattering; ocean; surface

Random scattering, refraction and focussing of ocean surface gravity waves (SGWs) by submesoscale currents result in spatial modulation - "patches'' - in the wave field. A signature of patches is that the significant wave height Hs varies by as much as 30% on horizontal scales in the range 10 to 100 km and time scales of a few hours to a day; these scales reflect those of submesoscale currents and are much smaller than those of the wind-stress forcing of SGWs which is traditionally assumed to control the spatio-temporal variability of Hs. As a result, patches pose a major challenge for the modelling and prediction of SGWs and of their impact on the ocean circulation. This project will tackle this challenge by developing new statistical models of the scattering of SGWs by submesoscale turbulence. We will use these models to explain the main features of patch variability, including a recently discovered relation between the power spectrum of Hs and the submesoscale kinetic energy spectrum, and to develop a parametrization of SGW scattering by submesoscale turbulence that we will incorporate into WAVEWATCH III.Spatial and temporal fluctuations in Hs are reflected in other properties of the SGW field including the Stokes velocity, and hence the wave-averaged vortex and Stokes-Coriolis forces which control the forcing of currents by SGWs. We will investigate the hypothesis that the interaction between waves and mean flows is strong on patch time and space scales, and develop new modeling tools tailored to these scales.

通过子尺度电流的海洋表面重力波（SGW）的随机散射，折射和焦点导致空间调制 - “斑块”。斑块的标志是，显着的波高HS变化了30％在10至100 km的水平尺度上，这些量表的时间尺度几个小时至一天； -HS的时空变异性。 。 HS中的III.空间和时间波动反映在SGW场的其他特性中，包括Stokes速度，因此，波浪平均涡流和Stokes-Coriolis力控制了SGWS的电流强迫。我们将研究以下假设：在贴片时间和空间尺度上，波和平均流之间的相互作用很强，并开发了针对这些尺度的新建模工具。

项目成果

Computing Lagrangian means

计算拉格朗日均值

• DOI: 10.1017/jfm.2023.228
• 发表时间: 2023
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Kafiabad H

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

Scattering of swell by currents

涌浪被水流散射

• DOI: 10.1017/jfm.2023.686
• 发表时间: 2023
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Wang, Han;Villas Bôas, Ana B.;Young, William R.;Vanneste, Jacques
• 通讯作者: Vanneste, Jacques