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| Buijsman, Maarten C.; Stephenson, Gordon R.; Ansong, Joseph K.; Arbic, Brian K.; Green, J.a. Mattias; Richman, James G.; Shriver, Jay F.; Vic, Clement; Wallcraft, Alan J.; Zhao, Zhongxiang. |
| The effects of horizontal resolution and wave drag damping on the semidiurnal M tidal energetics are studied for two realistically-forced global HYbrid Coordinate Ocean Model (HYCOM) simulations with 41 layers and horizontal resolutions of 8 km (; H12) and 4 km (; H25). In both simulations, the surface tidal error is minimized by tuning the strength of the linear wave drag, which is a parameterization of the surface-tide energy conversion to the unresolved baroclinic wave modes. In both simulations the M surface tide error with TPXO8-atlas, an altimetry constrained model, is 2.6 cm. Compared to H12, the surface tide energy conversion to the resolved vertical modes is increased by 50% in H25. This coincides with an equivalent reduction in the tuned loss of... |
| Tipo: Text |
Palavras-chave: Numerical models; Internal tides; Wave damping; Vertical modes. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00640/75199/75332.pdf |
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| Vic, Clement; Naveira Garabato, Alberto C.; Green, J. A. Mattias; Waterhouse, Amy F.; Zhao, Zhongxiang; Melet, Angelique; De Lavergne, Casimir; Buijsman, Maarten C.; Stephenson, Gordon R.. |
| Turbulent mixing in the ocean is key to regulate the transport of heat, freshwater and biogeochemical tracers, with strong implications for Earth's climate. In the deep ocean, tides supply much of the mechanical energy required to sustain mixing via the generation of internal waves, known as internal tides, whose fate-the relative importance of their local versus remote breaking into turbulence-remains uncertain. Here, we combine a semi-analytical model of internal tide generation with satellite and in situ measurements to show that from an energetic viewpoint, small-scale internal tides, hitherto overlooked, account for the bulk (>50%) of global internal tide generation, breaking and mixing. Furthermore, we unveil the pronounced geographical variations... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00601/71275/69674.pdf |
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