05 May 2023
 | 05 May 2023
Status: this preprint is open for discussion.

Open-Ocean Tides Simulated by ICON-O

Jin-Song von Storch, Eileen Hertwig, Veit Lüschow, Nils Brüggemann, Helmuth Haak, Peter Korn, and Vikram Singh

Abstract. This paper evaluates barotropic tides simulated by a newly developed ocean general circulation – ICON-O and assesses processes and model configurations that can impact the quality of the simulated tides. Such an investigation is crucial for applications addressing internal tides that are much more difficult to evaluate than the barotropic tides. Although not specially tuned for tides and not constrained by any observations, ICON-O is capable of producing the main features of the open-ocean barotropic tides as described by the geographical distributions of amplitude, phase, and amphidromic points. An error analysis shows however that the open-ocean tides simulated by ICON-O are less accurate than those simulated by two other OGCMs. Using a suite of tidal experiments we show that an increase in horizontal resolution improves only tides in shallow waters. Relevant for using ICON-O with its telescoping grid capacity, we show that spatial inhomogeneity does not deteriorate the quality of the simulated tides. We show further that implementing a parameterization of tidal bottom drag improves the quality of simulated tides, independent of model configuration used.

Jin-Song von Storch et al.

Status: open (until 02 Jul 2023)

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  • RC1: 'Comment on egusphere-2023-503', Anonymous Referee #1, 23 May 2023 reply

Jin-Song von Storch et al.

Jin-Song von Storch et al.


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Short summary
The new ocean general circulation model ICON-O is developed for running experiments at kilometer-scales and beyond. One targeted application is to simulate internal tides crucial for ocean mixing. To ensure their realism, which is difficult to assess, we evaluate the barotropic tides that generate internal tides. We show that ICON-O is able to realistically simulate the major aspects of the observed barotropic tides and discuss the aspects that impact the quality of the simulated tides.