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Article Dans Une Revue Climate of the Past Discussions Année : 2006

Comparing transient, accelerated, and equilibrium simulations of the last 30 000 years with the GENIE-1 model

Résumé

We examine several aspects of the ocean-atmosphere system over the last 30 000 years, by carrying out simulations with prescribed ice-sheets, atmospheric CO2 concentration, and orbital parameters. We use the GENIE-1 model with a geostrophic ocean, dynamic sea-ice, an energy balance atmosphere, and a land-surface scheme with fixed vegetation. A transient simulation, with boundary conditions derived from ice-core records and ice-sheet reconstructions, is compared with equilibrium snapshot simulations, including the Last Glacial Maximum (21 000 years before present; 21 kyrBP), mid-Holocene (6 kyrBP) and pre-industrial. The equilibrium snapshot surface temperatures are all very similar to their corresponding time period in the transient simulation, suggesting that in the last 30 000 years, the ocean-atmosphere system has been close to equilibrium with its boundary conditions. We investigate the method of accelerating the boundary conditions of a transient simulation and find that the Southern Ocean is the region most affected by the acceleration. The Northern Hemisphere, even with a factor of 10 acceleration, is relatively unaffected.
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Dates et versions

hal-00298130 , version 1 (18-06-2008)

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  • HAL Id : hal-00298130 , version 1

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D. J. Lunt, M. S. Williamson, P. J. Valdes, T. M. Lenton. Comparing transient, accelerated, and equilibrium simulations of the last 30 000 years with the GENIE-1 model. Climate of the Past Discussions, 2006, 2 (3), pp.267-283. ⟨hal-00298130⟩

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