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• W2949742431 abstract "The interaction between low frequency balanced motion and directly forced near-inertial motion is investigated numerically in a primitive equation recirculating ocean channel. The near-inertial flow exerts Reynolds stresses on the background flow and these stresses can act to extract energy from the balanced flow. This interaction is designated the and can be a significant term in the energy balance of the balanced flow, especially when the background Rossby number is not small.Simulations at eddy-permitting resolution are conducted, and the advective sink is found to be robust and significant across flows with a range of background Rossby numbers. Both the low-frequency kinetic energy sink and the corresponding high frequency kinetic energy source are found to lie in the mesoscale. A net result is that the balanced kinetic energy is reduced in most cases. Exceptions to this general rule are found to be related to the low frequency pressure work term, which describes energy exchanges between balanced potential and balanced kinetic energy, and can offset the reduction of balanced kinetic energy associated with the advective sink.Simulations at higher, (marginally) eddy-resolving resolution are then carried out. The advective sink is both larger and more efficiently generated than at lower resolution, and remains a mesoscale interaction. However, in these simulations, the low frequency pressure work term becomes more sensitive to the near-inertial forcing. It more than offsets the advective sink, and balanced kinetic energy increases as a result of adding near-inertial forcing.Changes in the pressure work at both eddy-permitting and eddy-resolving resolution suggest that for a complete picture of the effect of adding near-inertial forcing to a balanced flow, both kinetic and potential energy must be considered. The stratification, low and high frequency pressure work, and balanced–near-inertial potential energy interactions are all considered, and all are found to respond significantly to near-inertial forcing. The nature of the response depends on the flow's background state.The net transfer of total energy is also found to depend on the base state. As more near-inertial forcing is applied, the two more strongly forced base states show less energy transferred from low to high frequency motion and ultimately a transfer from near-inertial to low frequency motion. By contrast, the two more weakly forced base states show a robust transfer of energy from low frequencies to the near-inertial band, and the magnitude of this transfer increases with increasing forcing. These results are broadly consistent with previous efforts to quantify the balanced–near-inertial interaction, which have focused mostly on low Rossby number simulations.%%%%L'interaction entre les mouvements balances de basse frequence et les mouvements quasi-inertiels directement forces est examinee numeriquement dans un canal oceanique periodique dans le contexte des equations primitives. L'ecoulement quasi-inertiel exerce des stresses de…" @default.
• W2949742431 created "2019-06-27" @default.
• W2949742431 creator A5091568518 @default.
• W2949742431 date "2016-01-01" @default.
• W2949742431 modified "2023-09-23" @default.
• W2949742431 title "Effects of near-inertial forcing on the energetics of a wind-driven primitive equation channel" @default.
• W2949742431 hasPublicationYear "2016" @default.
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