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




Comparing transient, accelerated, and equilibrium simulations of the last 30 000 years with the GENIE-1 model - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 Bristol Research Initiative for the Dynamic Global Environment BRIDGE 2 School of Environmental Sciences Norwich 3 Tyndall Centre 4 Current affiliation: Quantum Information Group

Abstract : 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.





Autor: D. J. Lunt - M. S. Williamson - P. J. Valdes - T. M. Lenton -

Fuente: https://hal.archives-ouvertes.fr/



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