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| Ponte, Aurelien; Cornuelle, Bruce D.. |
| The propagation of remotely generated superinertial internal tides constitutes a difficulty for the modelling of regional ocean tidal variability which we illustrate in several ways. First, the M2 tidal solution inside a control region located along the Southern California Bight coastline is monitored while the extent of the numerical domain is increased (up to 512 x 512 km). While the amplitude and phase of sea level averaged over the region is quasi-insensitive to domain size, a steady increase of kinetic energy, predominantly baroclinic, is observed with increasing domain size. The increasing flux of energy into the control region suggests that this trend is explained by the growing contribution from remote generation sites of internal tide which can... |
| Tipo: Text |
Palavras-chave: Barotropic tide; Baroclinic tide; Internal tide; Coastal dynamics; Domain size sensitivity; Energy budgets. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00124/23566/21467.pdf |
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| Lahaye, Noe; Gula, Jonathan; Roullet, Guillaume. |
| The upper ocean is energetic at scales below the Rossby deformation radius owing to the existence of internal waves and submesoscale fronts and vortices. These contribute significantly to energy dissipation, tracer mixing and exchanges between the ocean surface layer, the ocean interior, and the atmospheric boundary layer. Internal waves and submesoscale motions both undergo strong spatial and seasonal variations, driven by different mechanisms. Here, we investigate the sea surface signature of internal waves and its seasonality using linear wave theory and a high‐resolution realistic simulation. In summer, internal waves are greatly amplified near the surface mostly due to a thin mixed layer bounded by a seasonal pycnocline. This surface amplification is... |
| Tipo: Text |
Palavras-chave: Internal tide; Submesosacle dynamics; Seasonality. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00486/59746/62847.pdf |
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| Ponte, Aurelien; Klein, Patrice. |
| The non persistent phase relationship between internal tides and astronomical forcings, also known as incoherence, has been identified as a major question in the context of future wide-swath satellite altimetry. This study addresses this issue using a novel set of numerical experiments where a plane-wave/low-mode internal tide propagates through a turbulent mesoscale eddy field. These experiments demonstrate the emergence of internal tide incoherence as the eddy turbulence is strengthened. In strongly turbulent situations, the internal tide signature on sea level forms complex interference patterns with large amplifications of the initial internal wave. These patterns evolve more rapidly than the signature of the turbulent eddy field on sea level. The... |
| Tipo: Text |
Palavras-chave: Internal tide; Wide-swath altimetry; Mesoscale turbulence; Incoherence. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00254/36571/35109.pdf |
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