Interpretations of the JEBAR Term

Mertz, G.; Wright, Daniel G.

doi:10.1175/1520-0485(1992)022<0301:iotjt>2.0.co;2

Cited by 162 publications

(129 citation statements)

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“…For a 3 dimensional problem, when looking at the dynamics of the vertically integrated motions, the torque between the across-isobath changes in the bathymetry and along-isobath changes in the density field, the so-called Joint Effect of Baroclinicity and Relief (JEBAR, see Mertz and Wright (1992)), provides an important source of vorticity to the dynamics. In our case, however, there are no changes in the along-isobath direction, and so JEBAR has no contribution.…”

Section: The Boundary Value Problemmentioning

confidence: 55%

Variability in the North Atlantic Deep Western Boundary Current : upstream causes and downstream effects as observed at Line W

Peña‐Molino¹

2010

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Section: The Boundary Value Problemmentioning

confidence: 55%

Variability in the North Atlantic Deep Western Boundary Current : upstream causes and downstream effects as observed at Line W

Peña‐Molino¹

2010

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“…We should mention that some of the relations in this section have previously been discussed in Olbers and Wübber (1991), Olbers et al (1992), Mertz and Wright (1992) and Cane et al (1998).…”

Section: Discussionmentioning

confidence: 99%

Six circumpolar currents—on the forcing of the Antarctic Circumpolar Current by wind and mixing

2006

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The transport of the Antarctic Circumpolar Current (ACC) is influenced by a variety of processes and parameters. A proper implementation of basin geometry, ocean topography and baroclinicity is known to be a fundamental requisite for a realistic simulation of the circulation and transport. Other, more subtle parameters are those of eddy-induced transports and diapycnal mixing of thermohaline tracers or buoyancy, either treated by eddy resolution or by a proper parameterization. Quite a number of realistic numerical simulations of the circulation in the Southern Ocean have recently been published. Many concepts on relations of the ACC transport to model parameters and forcing function are in the discussion, however, without much generality and little success.We present a series of numerical simulations of circumpolar flow with a simplified numerical model, ranging from flat-bottom wind-driven flow to baroclinic flow with realistic topography and wind and buoyancy forcing. Analysis of the balances of momentum, vorticity and baroclinic potential energy enables us to develop a new transport theory, which combines the most important mechanisms driving the circulation of the ACC and determining its zonal transport. The theory is based on the importance of the bottom vertical velocity in generating vorticity and shaping the baroclinic potential energy of the ACC. It explains the breaking of the f /h-constraint by baroclinicity and brings together in one equation the wind and buoyancy forcing of the current. The theory emphasizes the role of Ekman pumping and eddy diffusion of buoyancy to determine the transport. It also demonstrates that eddy viscosity effects are irrelevant in the barotropic vorticity balance and that friction arises via eddy diffusion of density. In this regime, the classical Stommel model of vorticity balance is revived where the bottom friction coefficient is replaced by K/λ 2 (with the GM coefficient K and the baroclinic Rossby radius λ) and a modified wind curl forcing appears.

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“…The Jacobian operator is represented by J. The beta term arises from the Coriolis force term, and the bottom pressure torque term arises from the pressure gradient term [Mertz and Wright, 1992]. The second term on the left-hand side is much smaller than the first term and is omitted from diagnostic calculations.…”

Section: Path Transition Mechanism On the Izu Ridgementioning

confidence: 99%