Periodically synchronously coupled integrations with the atmosphere-ocean 
general circulation model ECHAM3/LSG

Voss, Reinhard; Sause, Robert; Cubasch, Ulrich

doi:10.1007/s003820050221

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Periodically synchronously coupled integrations with the atmosphere-ocean general circulation model ECHAM3/LSG

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Voss, R., Sause, R., & Cubasch, U. (1998). Periodically synchronously coupled integrations with the atmosphere-ocean general circulation model ECHAM3/LSG. Climate Dynamics, 14, 249-266. doi:10.1007/s003820050221.

Cite as: https://hdl.handle.net/21.11116/0000-0003-5B49-6

Abstract

A new periodically synchronous coupling scheme has been applied to an atmosphere-ocean general circulation model. Due to a temporary switching off of the atmospheric model this scheme can considerably reduce computer requirements of coupled model experiments. In order to evaluate the new coupling scheme the model results are compared to corresponding synchronously coupled integrations. Experiments with fixed present-day CO2 concentration and a gradual increase of CO2 show a good reproduction of the mean state and the climate-change pattern, respectively. The deviations from the synchronously coupled experiments are in the range of the variability of the corresponding synchronously coupled runs. Due to the forcing during the ocean-only periods the short-term fluctuations are underestimated and the long-term variability is overestimated.