CABARET in the ocean gyres

Karabasov, Sergey A.; Berloff, Pavel; Goloviznin, V. M.

doi:10.1016/j.ocemod.2009.06.009

Cited by 84 publications

(56 citation statements)

References 40 publications

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“…The numerical method implemented in PEQUOD and used here incorporates the Compact Accurately Boundary Adjusting high-Resolution Technique (CABARET) for advection of relative potential vorticity, combined with integration of the advection of planetary vorticity. Further details regarding CABARET can be found in Karabasov and Goloviznin (2007) and Karabasov et al (2009). The potential vorticity inversion is performed using a fast Poisson solver using a customized version of FFTPACK.…”

Section: Numerical Model Descriptionmentioning

confidence: 99%

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A Geometric Interpretation of Eddy Reynolds Stresses in Barotropic Ocean Jets

Tamarin-Brodsky

Maddison

Heifetz

et al. 2016

Journal of Physical Oceanography

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Barotropic eddy fluxes are analysed through a geometric decomposition of the eddy stress tensor. Specifically, the geometry of the eddy variance ellipse, a two-dimensional visualization of the stress tensor describing the mean eddy shape and tilt, is used to elucidate eddy propagation and eddy feedback on the mean flow. Linear shear and jet profiles are analysed and theoretical results are compared against fully nonlinear simulations. For flows with zero planetary vorticity gradient, analytic solutions for the eddy ellipse tilt and anisotropy are obtained that provide a direct relationship between the eddy tilt and the phase difference of a normal mode solution. This allows a straightforward interpretation of the eddy-mean flow interaction in terms of classical stability theory: the initially unstable jet gives rise to eddies which are tilted "against the shear" and extract energy from the mean flow; once the jet stabilises, eddies become tilted "with the shear" and return their energy to the mean flow. For a nonzero planetary vorticity gradient, ray-tracing theory is used to predict ellipse geometry and its impact on eddy propagation within a jet. An analytic solution for the eddy tilt is found for a Rossby wave on a constant background shear. The ray tracing results broadly agree with the eddy tilt diagnosed from a fully nonlinear simulation.

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Section: Numerical Model Descriptionmentioning

confidence: 99%

“…JRM and DPM acknowledge the support of the Natural Environment Research Council grant number NE/L005166/1. The numerical code used in this article was developed from an original code provided by Pavel S. Berloff (see also Karabasov et al 2009). …”

mentioning

confidence: 99%

A Geometric Interpretation of Eddy Reynolds Stresses in Barotropic Ocean Jets

Tamarin-Brodsky

Maddison

Heifetz

et al. 2016

Journal of Physical Oceanography

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“…The dynamical model is adapted from Karabasov et al (2009) and only a very brief description of it is given here. This model employs an advanced advection scheme Compact Accurately Boundary-Adjusting High-Resolution Technique (CABARET) which allows achieving highly effective spatial resolution, meaning that numerical convergence is found at much coarser spatial resolution than in the case of traditional advection schemes.…”

Section: Numerical Model and Simulated Flowmentioning

confidence: 99%

Properties and Origins of the Anisotropic Eddy-Induced Transport in the North Atlantic

Kamenkovich

Rypina

Berloff

2015

Journal of Physical Oceanography

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This study examines anisotropic transport properties of the eddying North Atlantic flow, using an idealized model of the double-gyre oceanic circulation and altimetry-derived velocities. The material transport by the time-dependent flow (quantified by the eddy diffusivity tensor) varies geographically and is anisotropic, that is, it has a well-defined direction of the maximum transport. One component of the time-dependent flow, zonally elongated large-scale transients, is particularly important for the anisotropy, as it corresponds to primarily zonal material transport and long correlation time scales. The importance of these large-scale zonal transients in the material distribution is further confirmed with simulations of idealized color dye tracers, which has implications for parameterizations of the eddy transport in non-eddy-resolving models.

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“…To our knowledge, the importance of the underlying linear eigenmodes in shaping some of the key properties of the multiple jets and ambient eddies has been emphasized only in Berloff et al (2009b) and Yoo & Lee (2010). Our present advance is facilitated by a new and very efficient advection scheme (Karabasov, Berloff & Goloviznin 2009). A particular advantage of this scheme is the ability to carry out accurate simulations of baroclinic jets and ambient eddies at relatively large Reynolds numbers, and thus on a new level of dynamical realism.…”

Section: On Latency Of Multiple Zonal Jets In the Oceansmentioning

confidence: 99%

On latency of multiple zonal jets in the oceans

et al. 2011

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Most of the nearly zonal, multiple, alternating jets observed in the oceans are latent, that is, their amplitudes are weak relative to the ambient mesoscale eddies. Yet, relatively strong jets are often observed in dynamical simulations. To explore mechanisms controlling the degree of latency, we analyse solutions of an idealized, eddy-resolving and flat-bottom quasigeostrophic model, in which dynamically generated mesoscale eddies maintain and interact with a set of multiple zonal jets. We find that the degree of the latency is controlled primarily by the bottom friction: the larger the friction parameter, the more latent are the jets; and the degree of the latency is substantial for a realistic range of the oceanic bottom friction coefficient. This result not only provides a plausible explanation for the latency of the oceanic jets, but it may also be relevant to the prominent atmospheric multiple jets observed on giant gas planets, such as Jupiter. We hypothesize that these jets can be so strong because of the relative absence of the bottom friction. The mechanism controlling the latency in our solutions is understood in terms of the changes induced in the linear eigenmodes of the time-mean flow by varying the bottom friction coefficient; these changes, in turn, affect and modify the jets. Effects of large Reynolds numbers on the eddies, jets, and the latency are also discussed.

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CABARET in the ocean gyres

Cited by 84 publications

References 40 publications

A Geometric Interpretation of Eddy Reynolds Stresses in Barotropic Ocean Jets

A Geometric Interpretation of Eddy Reynolds Stresses in Barotropic Ocean Jets

Properties and Origins of the Anisotropic Eddy-Induced Transport in the North Atlantic

On latency of multiple zonal jets in the oceans

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