Global Barotropic Tide Modeling Using Inline Self‐Attraction and Loading in MPAS‐Ocean

Abstract We examine ocean tides in the barotropic version of Model for Prediction Across Scales (MPAS‐Ocean), component Department Energy Earth system model. focus on four factors that affect tidal accuracy: self‐attraction and loading (SAL), model resolution, details underlying bathymetry, parameterized topographic wave drag. The SAL term accounts Earth's crust self‐gravitation load‐deformed Earth. A common method calculating is to decompose mass anomalies into their spherical harmonic constituents. Here, we compare a scalar approximation versus an inline using fast transform package. Wave drag energy lost by breaking internal are produced flow over features. series successively finer quasi‐uniform resolution meshes (62.9, 31.5, 15.7, 7.87 km) variable (45 5 configuration. ran MPAS‐Ocean single‐layer mode forced five 45 km mesh obtained best total root‐mean‐square error (5.4 cm) deep ( 1,000 m) tide compared TPXO8 twice as 8 mesh, which had 5.8 cm. This comparable those found other forward (non‐assimilative) models. In future work, plan use study interactions with components, response climate change.