FN Archimer Export Format
PT J
TI On the interplay between horizontal resolution and wave drag and their effect on tidal baroclinic mode waves in realistic global ocean simulations
BT 
AF 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
AS 1:1;2:1;3:2;4:3;5:4;6:5;7:6;8:7;9:5;10:8;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 School of Ocean Science and Engineering, University of Southern Mississippi, Stennis Space Center, MS, USA
   Department of Mathematics, University of Ghana, Accra, Ghana
   Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, USA
   School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, UK
   Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, USA
   Naval Research Laboratory, Stennis Space Center, MS, USA
   University of Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale, Plouzané, Bretagne, France
   Applied Physics Laboratory, University of Washington, Seattle, WA, USA
C2 UNIV SOUTHERN MISSISSIPPI, USA
   UNIV GHANA, GHANA
   UNIV MICHIGAN, USA
   UNIV BANGOR, UK
   UNIV FLORIDA STATE, USA
   NAVAL RES LAB, USA
   UBO, FRANCE
   UNIV WASHINGTON, USA
UM LOPS
IN WOS Cotutelle UMR
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 3.686
TC 37
UR https://archimer.ifremer.fr/doc/00640/75199/75332.pdf
LA English
DT Article
DE ;Numerical models;Internal tides;Wave damping;Vertical modes
AB 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 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. 
PY 2020
PD AUG
SO Ocean Modelling
SN 1463-5003
PU Elsevier BV
VL 152
UT 000550870000004
DI 10.1016/j.ocemod.2020.101656
ID 75199
ER

EF