The application of Jacobian-free Newton-Krylov methods to reduce the spin-up time of ocean general circulation models

Journal article (2010)

Authors

Erik Bernsen Universiteit Utrecht
H. A. Dijkstra Universiteit Utrecht
J. Thies University Medical Center Groningen
Fred Wubs University Medical Center Groningen
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Published Date

2010-10

Language

English

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Abstract

In present-day forward time stepping ocean-climate models, capturing both the wind-driven and thermohaline components, a substantial amount of CPU time is needed in a so-called spin-up simulation to determine an equilibrium solution. In this paper, we present methodology based on Jacobian-Free Newton-Krylov methods to reduce the computational time for such a spin-up problem. We apply the method to an idealized configuration of a state-of-the-art ocean model, the Modular Ocean Model version 4 (MOM4). It is shown that a typical speed-up of a factor 10-25 with respect to the original MOM4 code can be achieved and that this speed-up increases with increasing horizontal resolution.