Inertia-gravity-wave diffusion by geostrophic turbulence: the impact of flow time dependence
Inertia-gravity-wave diffusion by geostrophic turbulence: the impact of flow time dependence
复制标题
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
复制
发表时间:
2023
影响因子:
3.7
通讯作者:
Cox M
中科院分区:
文献类型:
--
作者:
Cox M
The scattering of three-dimensional inertia-gravity waves by a turbulent geostrophic flow leads to the redistribution of their action through what is approximately a diffusion process in wavevector space. The corresponding diffusivity tensor was obtained by Kafiabad et al. (J. Fluid Mech., vol. 869, 2019, R7) under the assumption of a time-independent geostrophic flow. We relax this assumption to examine how the weak diffusion of wave action across constant-frequency cones that results from the slow time dependence of the geostrophic flow affects the distribution of wave energy. We find that the stationary wave-energy spectrum that arises from a single-frequency wave forcing is localised within a thin boundary layer around the constant-frequency cone, with a thickness controlled by the acceleration spectrum of the geostrophic flow. We obtain an explicit analytic formula for the wave-energy spectrum which shows good agreement with the results of a high-resolution simulation of the Boussinesq equations.
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影响因子:
3.7
作者:
Kafiabad H
通讯作者:
Kafiabad H
影响因子:
3.7
作者:
Young, William R.
通讯作者:
Young, William R.
影响因子:
3.7
作者:
Dong, Wenjing;Bühler, Oliver;Smith, K. Shafer
通讯作者:
Smith, K. Shafer
DOI:
10.48550/arxiv.1804.06347
发表时间:
2018
期刊:
--
影响因子:
--
作者:
Savva M
通讯作者:
Savva M
影响因子:
1.7
作者:
P. Müller
通讯作者:
P. Müller