Accuracy assessment of global barotropic ocean tide models Public Deposited

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  • The accuracy of state-of-the-art global barotropic tide models is assessed using bottom pressure data, coastal tide gauges, satellite altimetry, various geodetic data on Antarctic ice shelves, and independent tracked satellite orbit perturbations. Tide models under review include empirical, purely hydrodynamic (“forward”), and assimilative dynamical, i.e., constrained by observations. Ten dominant tidal constituents in the diurnal, semidiurnal, and quarter-diurnal bands are considered. Since the last major model comparison project in 1997, models have improved markedly, especially in shallow-water regions and also in the deep ocean. The root-sum-square differences between tide observations and the best models for eight major constituents are approximately 0.9, 5.0, and 6.5 cm for pelagic, shelf, and coastal conditions, respectively. Large intermodel discrepancies occur in high latitudes, but testing in those regions is impeded by the paucity of high-quality in situ tide records. Long-wavelength components of models tested by analyzing satellite laser ranging measurements suggest that several models are comparably accurate for use in precise orbit determination, but analyses of GRACE intersatellite ranging data show that all models are still imperfect on basin and subbasin scales, especially near Antarctica. For the M₂ constituent, errors in purely hydrodynamic models are now almost comparable to the 1980-era Schwiderski empirical solution, indicating marked advancement in dynamical modeling. Assessing model accuracy using tidal currents remains problematic owing to uncertainties in in situ current meter estimates and the inability to isolate the barotropic mode. Velocity tests against both acoustic tomography and current meters do confirm that assimilative models perform better than purely hydrodynamic models.
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  • Stammer, D., Ray, R. D., Andersen, O. B., Arbic, B. K., Bosch, W., Carrère, L., ... & Yi, Y. (2014). Accuracy assessment of global barotropic ocean tide models. Reviews of Geophysics, 52(3), 243-282. doi:10.1002/2014RG000450
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  • 52
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  • 3
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  • This work was fundedin part through the German ScienceFoundation (DFG) SPP 1257 (projectsDAROTA and DYNTIDE) and throughthe DFG-funded excellence initiativeCLISAP. Authors F.G.G., S.B.L., and R.D.R.were supported by the U.S. NationalAeronautics and Space Administrationthrough the Ocean Surface Topographyand GRACE programs. M.A.K. isa recipient of an Australian ResearchCouncil Future Fellowship (projectFT110100207). J.A.M.G.’s work wasdone under a Natural EnvironmentalResearch Council Advanced Fellowship(NE/F014821/). B.K.A. acknowledgessupport from Office of Naval Research(ONR) grant N00014-11-1-0487.J.G.R. and J.F.S. were supported bythe projects “Eddy resolving globalocean prediction including tides” and“Ageostrophic vorticity dynamics”sponsored by ONR under program element0602435N. B.K.A., J.G.R., and J.F.S.acknowledge a grant for computertime from the Department of DefenseHigh Performance Computing ModernizationProgram at the Navy DSRC.S.D.G. and V.L. were supportedthrough Natural EnvironmentResearch Council grant NE/I013563/1.The far-field component of theHawaiian Ocean Mixing Experimentand the deployment of the associatedacoustic tomography arrays weresupported by grants OCE-9819527and OCE98-19525 from the NationalScience Foundation. H.S.F. and Y.C.acknowledge support through theNational Natural Science Foundationof China (grants 41374010 and41306194). C.K.S., H.S.F., and Y.C.Y.were partially supported by NASA’sAdvanced Geodesy Program (grantNNX12AK28G) and by the ChineseAcademy of Sciences/SAFEA InternationalPartnership Program forCreative Research Teams (grantKZZD-EW-TZ-05).
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