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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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| Helber, Robert W.; Kara, A. Birol; Richman, James G.; Carnes, Michael R.; Barron, Charlie N.; Hurlburt, Harley E.; Boyer, Timothy. |
| We characterize the global ocean seasonal variability of the temperature versus salinity gradients in the transition layer just below the mixed layer using observations of conductivity temperature and depth and profiling float data from the National Ocean Data Center's World Ocean Data set. The balance of these gradients determines the temperature versus salinity control at the mixed layer depth (MLD). We define the MLD as the shallowest of the isothermal, isohaline, and isopycnal layer depths (ITLD, IHLD, and IPLD), each with a shared dependence on a 0.2 degrees C temperature offset. Data are gridded monthly using a variational technique that minimizes the squared analysis slope and data misfit. Surface layers of vertically uniform temperature, salinity,... |
| Tipo: Text |
Palavras-chave: Density compensation; Mixed layer depth; Transition layer. |
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00383/49452/49917.pdf |
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