Articles | Volume 19, issue 3
Research article
16 Mar 2023
Research article |  | 16 Mar 2023

A 1.5-million-year record of orbital and millennial climate variability in the North Atlantic

David A. Hodell, Simon J. Crowhurst, Lucas Lourens, Vasiliki Margari, John Nicolson, James E. Rolfe, Luke C. Skinner, Nicola C. Thomas, Polychronis C. Tzedakis, Maryline J. Mleneck-Vautravers, and Eric W. Wolff

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Cited articles

Ahn, J. and Brook, E. J.: Siple Dome ice reveals two modes of millennial CO2 change during the last ice age, Nat. Commun., 5, 3723,, 2014. 
Ahn, S., Khider, D., Lisiecki, L. E., and Lawrence, C. E.: A probabilistic Pliocene-Pleistocene stack of benthic δ18O using a profile hidden Markov model, Dynam. Stat. Clim. Syst., 2, 1–16,, 2017. 
Alley, R. B.: Wally was right: Predictive ability of the North Atlantic “Conveyor Belt” hypothesis for abrupt climate change, Annu. Rev. Earth Planet. Sci., 35, 241–272,, 2007. 
Alonso-Garcia, M., Sierro, F., Kucera, M., Flores, J., Cacho, I., and Andersen, N.: Ocean circulation, ice sheet growth and inter- hemispheric coupling of millennial climate variability during the mid-Pleistocene (ca 800–400 ka), Quaternay Sci. Rev., 30, 3234–3247,, 2011. 
Anderson, R. F., Ali, S., Bradtmiller, L. I., Nielsen, S. H. H., Fleisher, M. Q., Anderson, B. E., and Burckle, H.: Wind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2, Science, 323, 1443–1448,, 2009. 
Short summary
We produced a 1.5-million-year-long history of climate change at International Ocean Discovery Program Site U1385 of the Iberian margin, a well-known location for rapidly accumulating sediments on the seafloor. Our record demonstrates that longer-term orbital changes in Earth's climate were persistently overprinted by abrupt millennial-to-centennial climate variability. The occurrence of abrupt climate change is modulated by the slower variations in Earth's orbit and climate background state.