Spin-down of a barotropic vortex by irregular small-scale topography

Article Geosciences, Multidisciplinary

Topographic Stabilization of Ocean Rings

L. T. Gulliver et al.

Summary: This study proposes a plausible explanation for the longevity of large-scale ocean rings based on bottom roughness. The results show that topography stabilizes coherent vortices and dramatically prolongs their lifespan.

GEOPHYSICAL RESEARCH LETTERS (2022)

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Article Oceanography

Parameterizing Nonpropagating Form Drag over Rough Bathymetry

Jody M. Klymak et al.

Summary: The study emphasizes the importance of internal drag from topography and proposes a simple parameterization scheme. Simulations show that the parameterization accurately predicts drag under different forcing parameters and replicates the effect of rough bathymetry on eddies in wind-driven channel flows.

JOURNAL OF PHYSICAL OCEANOGRAPHY (2021)

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Article Mechanics

Barotropic instability of a time-dependent parallel flow

Timour Radko

Summary: This study investigates the long-wavelength instabilities of an inviscid parallel time-dependent current on the beta-plane. It reveals that the presence of even a weak fluctuating component can lead to linear instability in the basic current, attributed to the resonant forcing of large-scale Rossby waves. The study validates its findings through numerical simulations based on the asymptotic multiscale model.

JOURNAL OF FLUID MECHANICS (2021)

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Article Mechanics

Wave propagation in rotating shallow water in the presence of small-scale topography

E. J. Goldsmith et al.

Summary: The study explores how finite-amplitude, small-scale topography affects small-amplitude motions in the ocean, specifically focusing on modifications to dispersion relations of Poincare, Kelvin, and Rossby waves. Results show that topography can alter wave speeds and that resonant topographic Rossby waves in a narrow band may impact wave types under certain conditions.

JOURNAL OF FLUID MECHANICS (2021)

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Article Oceanography

A Closure for Lee Wave Drag on the Large-Scale Ocean Circulation

Carsten Eden et al.

Summary: A new closure for lee wave drag on large-scale circulation has been developed and tested in both idealized and realistic ocean model simulations. The closure is based on the radiative transfer equation for internal gravity waves and consists of two energy compartments for up- and downward propagating waves. The simulations demonstrate how lee waves interact with the mean flow, contribute to mixing, and exhibit parameter sensitivities.

JOURNAL OF PHYSICAL OCEANOGRAPHY (2021)

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Article Mechanics