A Transient Simulation of the Last 800 Thousand Years

Tobias Friedrich, IPRC-SOEST, Honolulu, United States, Axel Timmermann, IPRC-SOEST, Honolulu, HI, United States, Andrey Ganopolski, Potsdam Institute for Climate Impact Research, Potsdam, Germany and Oliver Timm, State University of New York at Albany, Department of Atmospheric and Environmental Sciences, Albany, United States
Abstract:
Using the earth system model of intermediate complexity LOVECLIM with time-varying greenhouse gas concentrations, orbitally-induced insolation changes and a model-based reconstruction of Northern Hemisphere ice volume, a transient simulation of the last 784 thousand years is conducted. The modeling results are compared to numerous marine and terrestrial paleo-datasets and exhibit good agreement for many records. Furthermore it is shown how simulated orbital-scale variations in Southern Hemispheric wind stress and sea-ice extent drive changes in Southern Ocean upwelling and meridional overturning and thus in global ocean ventilation. The simulation results are being made available for the paleo-community and provide a unique opportunity to help understand and interpret the temporal evolution of paleo-records.
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