Representation of Tides in ICON-O

Eileen Hertwig, Max Planck Institute for Meteorology, Hamburg, Germany and Jin-Song von Storch, Max Planck Institute for Meteorology, Climate Variability, Hamburg, Germany
Abstract:
The computation of tides is now included in ICON-O (Korn, 2017), the ocean model part of ICON-ESM. The performance of ICON-O in respect to representing barotropic tides is assessed with different spatial resolutions.

From the surface elevation the harmonic constants of the eight major diurnal and semi-diurnal tidal constituents are derived. These harmonic constants are compared with those of a reference data set at 102 pelagic tide measurements (Shum et al., 1997).

The harmonic constants of the M2 tide are computed globally and compared to those of the HAMTIDE model, a barotropic data-assimilative model for the global ocean (Zahel, 1995), and to those derived from the STORMTIDE2 simulation, a global 0.1º ocean general circulation model (Li and von Storch, 2019).

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