On the Interplay Between Horizontal Resolution and Wave Drag and Their Effect On Tidal Baroclinic Mode Waves In Realistic Global Ocean Simulations

Authors

Maarten Buijsman, University of Southern MississippiFollow
Gordon R. Stephenson, University of Southern Mississippi
Joseph K. Ansong, University of Ghana
Brian K. Arbic, University of MichiganFollow
J.A. Mattias Green, Bangor University
James G. Richman, Florida State UniversityFollow
Jay F. Shriver, Stennis Space CenterFollow
Clément Vic, University of Brest
Alan J. Wallcraft, Florida State UniversityFollow
Zhongxiang Zhao, University of Washington

Document Type

Article

Publication Date

8-1-2020

Department

Marine Science

School

Ocean Science and Engineering

Abstract

The effects of horizontal resolution and wave drag damping on the semidiurnal M₂ tidal energetics are studied for two realistically-forced global HYbrid Coordinate Ocean Model (HYCOM) simulations with 41 layers and horizontal resolutions of 8 km (1/12.5° H12) and 4 km (1/25°; 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 M₂ 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 energy from the surface tide to the wave drag. For the configurations studied here, the horizontal and not the vertical resolution is the factor limiting the number of vertical modes that are resolved in most of the global ocean: modes 1–2 in H12 and modes 1–5 in H25. The wave drag also dampens the resolved internal tides. The 40% reduction in wave-drag strength does not result in a proportional increase in the mode-1 energy density in H25. In the higher-resolution simulations, topographic mode-scattering and wave–wave interactions are better resolved. This allows for an energy flux out of mode 1 to the higher modes, mitigating the need for an internal tide damping term. The HYCOM simulations are validated with analytical conversion models and altimetry-inferred sea-surface height, fluxes, and surface tide dissipation. H25 agrees best with these data sets to within ~10%. To facilitate the comparison of stationary tide signals extracted from time series with different durations, we successfully apply a spatially-varying correction factor.

Publication Title

Ocean Modelling

Volume

152

Recommended Citation

Buijsman, M., Stephenson, G. R., Ansong, J. K., Arbic, B. K., Green, J., Richman, J. G., Shriver, J. F., Vic, C., Wallcraft, A. J., Zhao, Z. (2020). On the Interplay Between Horizontal Resolution and Wave Drag and Their Effect On Tidal Baroclinic Mode Waves In Realistic Global Ocean Simulations. Ocean Modelling, 152.
Available at: https://aquila.usm.edu/fac_pubs/18092