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

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

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 Creators:
Willeit, Matteo1, Author              
Ganopolski, Andrey1, Author              
Calov, Reinhard1, Author              
Brovkin, V.2, Author
Affiliations:
1Potsdam Institute for Climate Impact Research, Potsdam, ou_persistent13              
2External Organizations, ou_persistent22              

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 Abstract: 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.

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 Dates: 2019
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1126/sciadv.aav7337
PIKDOMAIN: RD1 - Earth System Analysis
eDoc: 8472
Research topic keyword: Paleoclimate
Research topic keyword: Ice
Research topic keyword: Atmosphere
Research topic keyword: Oceans
Research topic keyword: Nonlinear Dynamics
Model / method: CLIMBER
Model / method: SICOPOLIS
Regional keyword: Global
Organisational keyword: RD1 - Earth System Analysis
Working Group: Long-Term Dynamics of the Earth System
 Degree: -

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Title: Science Advances
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 5 Sequence Number: eaav7337 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/161027