Global and Planetary Change; Stratigraphy; Paleontology
Abstract :
[en] During the last 20 000 years the climate of the earth has changed from a state much colder than today, with large ice sheets over North America and northwest Eurasia, to its present state. The fully interactive simulation of this transition represents a hitherto unsolved challenge for state-of-the-art climate models. We use a novel coupled comprehensive atmosphere-ocean-vegetation-ice-sheet-solid-earth model to simulate the transient climate evolution from the Last Glacial Maximum to pre-industrial times. The model considers dynamical changes in the glacier mask, land-sea mask, and river routing. An ensemble of transient model simulations successfully captures the main features of the last deglaciation, as depicted by proxy estimates. In addition, our model simulates a series of abrupt climate changes, which can be attributed to different drivers. Sudden weakenings of the Atlantic meridional overturning circulation during the glacial period and the first half of the deglaciation are caused by Heinrich-event like ice-sheet surges, which are part of the model generated internal variability. We show that the timing of these surges depends on the initial state and the model parameters. Abrupt events during the second half of the deglaciation are caused by a long-term shift in the sign of the Arctic freshwater budget, changes in river routing, and/or the opening of ocean passages.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Mikolajewicz, Uwe; Max Planck Institute for Meteorology, Hamburg, Germany
Kapsch, Marie-Luise ; Max Planck Institute for Meteorology, Hamburg, Germany
Schannwell, Clemens ; Max Planck Institute for Meteorology, Hamburg, Germany
Six, Katharina D. ; Max Planck Institute for Meteorology, Hamburg, Germany
Ziemen, Florian A. ; Max Planck Institute for Meteorology, Hamburg, Germany
Bagge, Meike ; GFZ Helmholtz Centre for Geosciences, Potsdam, Germany
Baudouin, Jean-Philippe; Department of Geosciences, University of Tübingen, Tübingen, Germany
Erokhina, Olga; Max Planck Institute for Meteorology, Hamburg, Germany
Gayler, Veronika; Max Planck Institute for Meteorology, Hamburg, Germany
Klemann, Volker ; GFZ Helmholtz Centre for Geosciences, Potsdam, Germany
Meccia, Virna L. ; Max Planck Institute for Meteorology, Hamburg, Germany
Mouchet, Anne ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) ; Max Planck Institute for Meteorology, Hamburg, Germany
Riddick, Thomas; Max Planck Institute for Meteorology, Hamburg, Germany
This research has been supported by the German Federal Ministry of Education and Research as a Research for Sustainability Initiative through the PalMod project (grant nos. 01LP1916A, 01LP1917B, 01LP1915C, 01LP2302A, 01LP2316A, 01LP2318A, 01LP1918A, and 01L2305A). This work also received funding from the European Union's Horizon 2020 research and innovation programme (Marie Sklodowska-Curie grant agreement no. 660893). The article processing charges for this open-access publication were covered by the Max Planck Society.
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