under a Creative Commons License. Climate of the Past Comparing transient, accelerated, and equilibrium simulations of the last 30 000 years with the GENIE-1 model

Abstract. We examine several aspects of the oceanatmosphere 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 frictional geostrophic ocean, dynamic sea ice, an energy balan...

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Bibliographic Details
Main Authors: D. J. Lunt, M. S. Williamson, P. J. Valdes, T. M. Lenton, R. Marsh
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
ice core
Ice Sheet
Sea ice
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.202
http://hal.archives-ouvertes.fr/docs/00/29/80/59/PDF/cp-2-221-2006.pdf
Description
Summary:Abstract. We examine several aspects of the oceanatmosphere 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 frictional 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 preindustrial. The equilibrium snapshot simulations are all very similar to their corresponding time period in the transient simulation, indicating that over the last 30 000 years, the model’s ocean-atmosphere system is close to equilibrium

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