Articles | Volume 19, issue 7
https://doi.org/10.5194/cp-19-1447-2023
https://doi.org/10.5194/cp-19-1447-2023
Research article
 | 
21 Jul 2023
Research article |  | 21 Jul 2023

Disparate energy sources for slow and fast Dansgaard–Oeschger cycles

Diederik Liebrand, Anouk T. M. de Bakker, Heather J. H. Johnstone, and Charlotte S. Miller

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Cited articles

Alley, R. B., Anandakrishnan, S., and Jung, P.: Stochastic resonance in the North Atlantic, Paleoceanography, 16, 190–198, https://doi.org/10.1029/2000PA000518, 2001. 
Andersen, K. K., Svensson, A., Johnsen, S. J., Rasmussen, S. O., Bigler, M., Rothlisberger, R., Ruth, U., Siggaard-Andersen, M. L., Steffensen, J. P., Dahl-Jensen, D., Vinther, B. M., and Clausen, H. B.: The Greenland Ice Core Chronology 2005, 15–42 ka. Part 1: constructing the time scale, Quaternary Sci. Rev., 25, 3246–3257, https://doi.org/10.1016/j.quascirev.2006.08.002, 2006. 
Armstrong, E., Izumi, K., and Valdes, P.: Identifying the mechanisms of DO-scale oscillations in a GCM: a salt oscillator triggered by the Laurentide ice sheet, Clim. Dynam., 60, 3983–4001, https://doi.org/10.1007/s00382-022-06564-y, 2022. 
Batchelor, C. J., Marcott, S. A., Orland, I. J., He, F., and Edwards, R. L.: Decadal warming events extended into central North America during the last glacial period, Nat. Geosci., 16, 257–261, https://doi.org/10.1038/s41561-023-01132-3, 2023. 
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Short summary
Climate cycles with millennial periodicities are enigmatic because no Earth external climate forcing exists that operates on millennial timescales. Using a statistical analysis of a famous Greenlandic air temperature record, we show that two disparate energy sources (one astronomical and one centennial) fuel millennial climate variability. We speculate that two distinct Earth internal cryospheric/climatic/oceanic processes are responsible for the transfer of energy to millennial climate cycles.