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| Ponte, Aurelien; Klein, Patrice; Dunphy, Michael; Le Gentil, Sylvie. |
| The performance of a tentative method that disentangles the contributions of a low-mode internal tide on sea level from that of the balanced mesoscale eddies is examined using an idealized high resolution numerical simulation. This disentanglement is essential for proper estimation from sea level of the ocean circulation related to balanced motions. The method relies on an independent observation of the sea surface water density whose variations are 1/dominated by the balanced dynamics and 2/correlate with variations of potential vorticity at depth for the chosen regime of surface-intensified turbulence. The surface density therefore leads via potential vorticity inversion to an estimate of the balanced contribution to sea level fluctuations. The... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00374/48487/48761.pdf |
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| Dunphy, Michael; Ponte, Aurelien; Klein, Patrice; Le Gentil, Sylvie. |
| Understanding how internal tides distort and lose coherence as they propagate through the ocean has been identified as a key issue for interpreting data from the upcoming wide-swath altimeter mission SWOT. This study addresses that issue through the analysis of numerical experiments where a low mode internal tide propagates through a quasi-geostrophic turbulent jet. We present a set of reduced equations based on vertical mode projections that describe the dynamics of the low-mode internal tides as they propagate through the slower turbulent field. Diagnostics of the terms responsible for the interaction between the wave and the slow circulation are computed from the numerical outputs. The large scale change of stratification, on top of eddies and jet... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00342/45364/44853.pdf |
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