Pure Inertial Waves Radiating From Low‐Frequency Flows Over Large‐Scale Topography

Xie, Xiang; Liu, Xiaohui; Chen, Zhiwu; Wang, Yan; Chen, Dake; Li, Wei; Zhang, Dongsheng

doi:10.1029/2022gl099889

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…A local excitation is also possible and could be due to, for example, the barotropic tide flowing across boundary topography. Such a mechanism is key to closing Earth's oceanic energy budget; it accounts for ∼30% of the total energy dissipated by ocean tides (e.g., Garrett & Kunze 2007, Xie et al 2023. No study relevant for subsurface oceans, involving different shell thicknesses and topographies along both top and bottom boundaries as well as various relative amplitudes of stratification and rotation, has been performed so far.…”

Section: Beyond the Laplace Tidal Equationsmentioning

confidence: 99%

The Physical Oceanography of Ice-Covered Moons

Soderlund,

Rovira-Navarro,

Le Bars

et al. 2024

Annu. Rev. Mar. Sci.

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In the outer solar system, a growing number of giant planet satellites are now known to be abodes for global oceans hidden below an outer layer of ice. These planetary oceans are a natural laboratory for studying physical oceanographic processes in settings that challenge traditional assumptions made for Earth's oceans. While some driving mechanisms are common to both systems, such as buoyancy-driven flows and tides, others, such as libration, precession, and electromagnetic pumping, are likely more significant for moons in orbit around a host planet. Here, we review these mechanisms and how they may operate across the solar system, including their implications for ice–ocean interactions. Future studies should continue to advance our understanding of each of these processes as well as how they may act together in concert. This interplay also has strong implications for habitability as well as testing oceanic hypotheses with future missions. Expected final online publication date for the Annual Review of Marine Science, Volume 16 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Beyond the Laplace Tidal Equationsmentioning

confidence: 99%

The Physical Oceanography of Ice-Covered Moons

Soderlund,

Rovira-Navarro,

Le Bars

et al. 2024

Annu. Rev. Mar. Sci.

View full text Add to dashboard Cite

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“…On the other hand, the bottom‐intensified NIWs tend to be mixed with near‐inertial oscillations/waves generated from other sources, for example, generated by surface winds or the breaking of internal tides (Chen et al., 2022; Legg & Huijts, 2006; Musgrave et al., 2016). In the recent decade, suspicious deep‐ocean NIWs generated by current‐topography interactions have been reported in different regions (e.g., Brearley et al., 2013; Fernandez‐Castro et al., 2020; Hu et al., 2020; Liang & Thurnherr, 2012; Xie et al., 2023). However, the generation mechanisms of these NIWs remain obscure and whether are they associated with lee wave breaking is unknown.…”

Section: Introductionmentioning

confidence: 99%

Influence of Lee Wave Breaking on Far‐Field Mixing in the Deep Ocean

Zheng,

Zhang,

Yang

et al. 2024

JGR Oceans

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Breaking of internal lee waves generated by flow‐topography interaction is an important driving mechanism for abyssal mixing. By assuming that lee‐wave‐driven mixing is a local process, direct measurements in the past mainly focused on the water column over rough topography. In this study, a non‐local role of lee waves on remote mixing is investigated by using mooring observations in the northwestern Philippine Basin and a series of 2‐dimensional high‐resolution numerical simulations. We find that the breaking of lee waves can generate near‐inertial waves (NIWs) which can propagate away from their generation sites. The NIWs have strong vertical shear which can significantly elevate turbulent dissipation and mixing over remote uneven seafloor. Based on the topography perturbations numerical experiments, we find that for the remote gentle topography with inverse Froude number (Fr−1) between 0 and 0.5, the arrival of upstream NIWs can elevate the near‐bottom layer (0–1,000 m above bottom) dissipation rate and vertical diffusivity by 9.2 and 10.4 times, respectively at 30–50 km away from the NIWs source. For the remote rough topography with Fr−1 between 0 and 4, the corresponding increases are 3.5 and 4.4 times, respectively. The mechanism of upstream NIWs to elevate the downstream dissipation and mixing is through strengthening the shear instability over the far‐field topography, which is associated with NIWs' interactions with the topography and the generated lee waves therein. The results of this study will provide a foundation for improving the mixing parameterizations associated with current‐topography interactions.

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Pure Inertial Waves Radiating From Low‐Frequency Flows Over Large‐Scale Topography

Cited by 2 publications

References 32 publications

The Physical Oceanography of Ice-Covered Moons

The Physical Oceanography of Ice-Covered Moons

Influence of Lee Wave Breaking on Far‐Field Mixing in the Deep Ocean

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