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Mid-Pleistocene transition in glacial cycles explained by declining CO2 and regolith removal

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/persons/resource/willeit

Willeit,  Matteo
Potsdam Institute for Climate Impact Research;

/persons/resource/andrey.ganopolski

Ganopolski,  Andrey
Potsdam Institute for Climate Impact Research;

/persons/resource/Reinhard.Calov

Calov,  Reinhard
Potsdam Institute for Climate Impact Research;

Brovkin,  V.
External Organizations;

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Zitation

Willeit, M., Ganopolski, A., Calov, R., Brovkin, V. (2019): Mid-Pleistocene transition in glacial cycles explained by declining CO2 and regolith removal. - Science Advances, 5, eaav7337.
https://doi.org/10.1126/sciadv.aav7337


Zitierlink: https://publications.pik-potsdam.de/pubman/item/item_23117
Zusammenfassung
Variations in Earth’s orbit pace the glacial-interglacial cycles of the Quaternary, but the mechanisms that transform regional and seasonal variations in solar insolation into glacial-interglacial cycles are still elusive. Here, we present transient simulations of coevolution of climate, ice sheets, and carbon cycle over the past 3 million years. We show that a gradual lowering of atmospheric CO2 and regolith removal are essential to reproduce the evolution of climate variability over the Quaternary. The long-term CO2 decrease leads to the initiation of Northern Hemisphere glaciation and an increase in the amplitude of glacial-interglacial variations, while the combined effect of CO2 decline and regolith removal controls the timing of the transition from a 41,000- to 100,000-year world. Our results suggest that the current CO2 concentration is unprecedented over the past 3 million years and that global temperature never exceeded the preindustrial value by more than 2°C during the Quaternary.