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  Path-dependence of the Plio–Pleistocene glacial/interglacial cycles

Carrillo, J., Mann, M. E., Larson, C. J., Christiansen, S., Willeit, M., Ganopolski, A., Li, X., Murphy, J. G. (2024): Path-dependence of the Plio–Pleistocene glacial/interglacial cycles. - Proceedings of the National Academy of Sciences of the United States of America (PNAS), 121, 26, e2322926121.
https://doi.org/10.1073/pnas.2322926121

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Datensatz-Permalink: https://publications.pik-potsdam.de/pubman/item/item_30308 Versions-Permalink: https://publications.pik-potsdam.de/pubman/item/item_30308_2
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 Urheber:
Carrillo, Judit1, Autor
Mann, Michael E.1, Autor
Larson, Christopher J.2, Autor
Christiansen, Shannon1, Autor
Willeit, Matteo2, Autor              
Ganopolski, Andrey2, Autor              
Li, Xueke1, Autor
Murphy, Jack G.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Zusammenfassung: We find strong path dependence in the evolution of the Plio–Pleistocene glaciations using CLIMBER-2 Earth System Model simulations from the mid-Pliocene to modern preindustrial (3 My-0 My BP) driven by a gradual decrease in volcanic carbon dioxide outgassing and regolith removal from basal ice interaction. Path dependence and hysteresis are investigated by alternatively driving the model forward and backward in time. Initiating the model with preindustrial conditions and driving the model backward using time-reversed forcings, the increase in volcanic outgassing back-in-time (BIT) does not generate the high CO2 levels and relatively ice-free conditions of the late Pliocene seen in forward-in-time (FIT) simulations of the same model. This behavior appears to originate from nonlinearities and initial state dependence in the carbon cycle. A transition from low-amplitude sinusoidal obliquity (~41 ky) and precession (~23 ky) driven glacial/interglacial cycles to high-amplitude ~100 ky likely eccentricity-related sawtooth cycles seen between −1.25 My and −0.75 My BP (the Mid-Pleistocene transition or “MPT”) in FIT simulations disappears in BIT integrations depending on the details of how the regolith removal process is treated. A transition toward depleted regolith and lowered atmospheric CO2 levels are both required to reproduce the MPT.

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Sprache(n): eng - Englisch
 Datum: 2024-06-172024-06-17
 Publikationsstatus: Final veröffentlicht
 Seiten: 7
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1073/pnas.2322926121
PIKDOMAIN: RD1 - Earth System Analysis
Organisational keyword: RD1 - Earth System Analysis
Working Group: Long-Term Dynamics of the Earth System
Research topic keyword: Paleoclimate
MDB-ID: No data to archive
OATYPE: Hybrid Open Access
 Art des Abschluß: -

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Titel: Proceedings of the National Academy of Sciences of the United States of America (PNAS)
Genre der Quelle: Zeitschrift, SCI, Scopus, p3
 Urheber:
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Seiten: - Band / Heft: 121 (26) Artikelnummer: e2322926121 Start- / Endseite: - Identifikator: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals410
Publisher: National Academy of Sciences (NAS)